...

.gitignore

@@ -0,0 +1 @@
+.vscode

TODO.txt

@@ -1,3 +0,0 @@
-string formatting
-Dynamic arrays
-C-style arrays

bindings/generate.py

@@ -0,0 +1,166 @@
+#!/usr/bin/env python3
+
+import sys
+import os
+import clang.cindex
+from clang.cindex import CursorKind, TypeKind, Type
+
+
+def map_type(clang_type: Type):
+    canonical = clang_type.get_canonical()
+    kind = canonical.kind
+    spelling = (
+        canonical.spelling.replace("const ", "")
+        .replace("volatile ", "")
+        .replace("restrict ", "")
+        .replace("struct ", "")
+        .replace("union ", "")
+    )
+
+    if kind == TypeKind.POINTER:
+        pointee = canonical.get_pointee()
+        if pointee.kind == TypeKind.RECORD:
+            decl = pointee.get_declaration()
+            if not decl.is_definition():
+                return "^void"
+
+        if pointee.kind == TypeKind.FUNCTIONPROTO:
+            arg_types = []
+
+            for arg in pointee.get_canonical().argument_types():
+                arg_types.append(map_type(arg))
+
+            mapped_return = map_type(pointee.get_canonical().get_result())
+            args_str = ", ".join(arg_types)
+
+            return f"func({args_str}): {mapped_return}"
+
+        return f"^{map_type(pointee)}"
+
+    if kind == TypeKind.CONSTANTARRAY:
+        element_type = canonical.get_array_element_type()
+        size = canonical.get_array_size()
+        return f"[{size}]{map_type(element_type)}"
+
+    if kind == TypeKind.INCOMPLETEARRAY:
+        element_type = canonical.get_array_element_type()
+        return f"[?]{map_type(element_type)}"
+
+    if kind == TypeKind.FUNCTIONPROTO or kind == TypeKind.FUNCTIONNOPROTO:
+        arg_types = []
+
+        for arg in canonical.argument_types():
+            arg_types.append(map_type(arg))
+
+        mapped_return = map_type(canonical.get_result())
+        args_str = ", ".join(arg_types)
+
+        return f"func({args_str}): {mapped_return}"
+
+    if kind == TypeKind.VOID:
+        return "void"
+
+    if kind == TypeKind.BOOL:
+        return "bool"
+
+    if kind in [TypeKind.CHAR_S, TypeKind.SCHAR]:
+        return "i8"
+    if kind == TypeKind.CHAR_U or kind == TypeKind.UCHAR:
+        return "u8"
+    if kind == TypeKind.SHORT:
+        return "i16"
+    if kind == TypeKind.USHORT:
+        return "u16"
+    if kind == TypeKind.INT:
+        return "i32"
+    if kind == TypeKind.UINT:
+        return "u32"
+    if kind in [TypeKind.LONG, TypeKind.LONGLONG]:
+        return "i64"
+    if kind in [TypeKind.ULONG, TypeKind.ULONGLONG]:
+        return "u64"
+
+    if kind == TypeKind.FLOAT:
+        return "f32"
+    if kind == TypeKind.DOUBLE or kind == TypeKind.LONGDOUBLE:
+        return "f64"
+
+    if kind == TypeKind.RECORD:
+        return spelling
+
+    raise Exception(f"Unresolved type: {spelling}")
+
+
+if len(sys.argv) != 2:
+    print("Usage: python3 generate.py [path to header]", file=sys.stderr)
+    sys.exit(1)
+
+filename = sys.argv[1]
+
+index = clang.cindex.Index.create()
+
+tu = index.parse(filename, ["-x", "c", "-std=c23", "-I/usr/include"])
+
+if tu.diagnostics:
+    for diag in tu.diagnostics:
+        if diag.severity >= clang.cindex.Diagnostic.Error:
+            print(f"Error: {diag.spelling}", file=sys.stderr)
+
+print(f'module "{os.path.basename(filename).split(".")[0]}"')
+print()
+
+seen_structs = []
+
+for cursor in tu.cursor.walk_preorder():
+    if cursor.location.file and cursor.location.file.name != filename:
+        continue
+
+    if cursor.kind == CursorKind.FUNCTION_DECL:
+        name = cursor.spelling
+        return_type = map_type(cursor.result_type)
+
+        params = []
+        for arg in cursor.get_arguments():
+            param_name = arg.spelling
+            param_type = map_type(arg.type)
+            params.append(f"{param_name}: {param_type}")
+
+        params_str = ", ".join(params)
+
+        print(f'export extern "{name}" func {name}({params_str}): {return_type}')
+
+    elif cursor.kind == CursorKind.STRUCT_DECL:
+        if cursor.get_usr() in seen_structs:
+            continue
+
+        seen_structs.append(cursor.get_usr())
+
+        if cursor.is_definition():
+            name = cursor.spelling
+            print(f"export struct {name}")
+            print("{")
+            for field in cursor.get_children():
+                if field.kind == CursorKind.FIELD_DECL:
+                    field_name = field.spelling
+                    field_type = map_type(field.type)
+                    print(f"    {field_name}: {field_type}")
+                else:
+                    raise Exception(
+                        f"Unsupported child of struct: {field.spelling}: {field.kind}"
+                    )
+            print("}")
+
+    elif cursor.kind == CursorKind.ENUM_DECL:
+        name = cursor.spelling
+        print(f"export enum {name} : u32")
+        print("{")
+        for field in cursor.get_children():
+            if field.kind == CursorKind.ENUM_CONSTANT_DECL:
+                field_name = field.spelling
+                field_value = field.enum_value
+                print(f"    {field_name} = {field_value}")
+            else:
+                raise Exception(
+                    f"Unsupported child of enum: {field.spelling}: {field.kind}"
+                )
+        print("}")

compiler/.gitignore

@@ -1,4 +1,34 @@
-.idea
+# Common IntelliJ Platform excludes
-bin
+
-obj
+# User specific
-.build
+**/.idea/**/workspace.xml
+**/.idea/**/tasks.xml
+**/.idea/shelf/*
+**/.idea/dictionaries
+**/.idea/httpRequests/
+
+# Sensitive or high-churn files
+**/.idea/**/dataSources/
+**/.idea/**/dataSources.ids
+**/.idea/**/dataSources.xml
+**/.idea/**/dataSources.local.xml
+**/.idea/**/sqlDataSources.xml
+**/.idea/**/dynamic.xml
+
+# Rider
+# Rider auto-generates .iml files, and contentModel.xml
+**/.idea/**/*.iml
+**/.idea/**/contentModel.xml
+**/.idea/**/modules.xml
+
+*.suo
+*.user
+.vs/
+[Bb]in/
+[Oo]bj/
+_UpgradeReport_Files/
+[Pp]ackages/
+
+Thumbs.db
+Desktop.ini
+.DS_Store

compiler/.idea/.idea.Compiler/.idea/.gitignore

@@ -0,0 +1,13 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Rider ignored files
+/modules.xml
+/projectSettingsUpdater.xml
+/contentModel.xml
+/.idea.Compiler.iml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

compiler/.idea/.idea.Compiler/.idea/.name

@@ -0,0 +1 @@
+Compiler

compiler/.idea/.idea.Compiler/.idea/encodings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
+</project>

compiler/.idea/.idea.Compiler/.idea/indexLayout.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="UserContentModel">
+    <attachedFolders>
+      <Path>Runtime</Path>
+    </attachedFolders>
+    <explicitIncludes />
+    <explicitExcludes />
+  </component>
+</project>

compiler/.idea/.idea.Compiler/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

compiler/Compiler.sln

@@ -0,0 +1,28 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NubLang", "NubLang\NubLang.csproj", "{5047E21F-590D-4CB3-AFF3-064316485009}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NubLang.CLI", "NubLang.CLI\NubLang.CLI.csproj", "{A22F17ED-FA17-45AB-92BA-CD02C28B3524}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NubLang.LSP", "NubLang.LSP\NubLang.LSP.csproj", "{07968F84-0C2E-4D2E-8905-DC8A6140B4C0}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5047E21F-590D-4CB3-AFF3-064316485009}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5047E21F-590D-4CB3-AFF3-064316485009}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5047E21F-590D-4CB3-AFF3-064316485009}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5047E21F-590D-4CB3-AFF3-064316485009}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A22F17ED-FA17-45AB-92BA-CD02C28B3524}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A22F17ED-FA17-45AB-92BA-CD02C28B3524}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A22F17ED-FA17-45AB-92BA-CD02C28B3524}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A22F17ED-FA17-45AB-92BA-CD02C28B3524}.Release|Any CPU.Build.0 = Release|Any CPU
+		{07968F84-0C2E-4D2E-8905-DC8A6140B4C0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{07968F84-0C2E-4D2E-8905-DC8A6140B4C0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{07968F84-0C2E-4D2E-8905-DC8A6140B4C0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{07968F84-0C2E-4D2E-8905-DC8A6140B4C0}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

compiler/Diagnostic.cs

@@ -1,173 +0,0 @@
-namespace Compiler;
-
-public class Diagnostic
-{
-    public static Builder Info(string message) => new Builder(DiagnosticSeverity.Info, message);
-    public static Builder Warning(string message) => new Builder(DiagnosticSeverity.Warning, message);
-    public static Builder Error(string message) => new Builder(DiagnosticSeverity.Error, message);
-
-    private Diagnostic(DiagnosticSeverity severity, string message, string? help, FileInfo? file)
-    {
-        Severity = severity;
-        Message = message;
-        Help = help;
-        File = file;
-    }
-
-    public class FileInfo(string file, int line, int column, int length)
-    {
-        public string File { get; } = file;
-        public int Line { get; } = line;
-        public int Column { get; } = column;
-        public int Length { get; } = length;
-    }
-
-    public DiagnosticSeverity Severity { get; }
-    public string Message { get; }
-    public string? Help { get; }
-    public FileInfo? File { get; }
-
-    public enum DiagnosticSeverity
-    {
-        Info,
-        Warning,
-        Error,
-    }
-
-    public class Builder(DiagnosticSeverity severity, string message)
-    {
-        private FileInfo? file;
-        private string? help;
-
-        public Builder At(string fileName, int line, int column, int length)
-        {
-            file = new FileInfo(fileName, line, column, length);
-            return this;
-        }
-
-        public Builder At(string fileName, Token? token)
-        {
-            if (token != null)
-            {
-                At(fileName, token.Line, token.Column, token.Length);
-            }
-
-            return this;
-        }
-
-        public Builder At(string fileName, Node? node)
-        {
-            if (node != null && node.Tokens.Count != 0)
-            {
-                // todo(nub31): Calculate length based on last token
-                At(fileName, node.Tokens[0]);
-            }
-
-            return this;
-        }
-
-        public Builder At(string fileName, TypedNode? node)
-        {
-            if (node != null && node.Tokens.Count != 0)
-            {
-                // todo(nub31): Calculate length based on last token
-                At(fileName, node.Tokens[0]);
-            }
-
-            return this;
-        }
-
-        public Builder WithHelp(string helpMessage)
-        {
-            help = helpMessage;
-            return this;
-        }
-
-        public Diagnostic Build()
-        {
-            return new Diagnostic(severity, message, help, file);
-        }
-    }
-}
-
-public class CompileException(Diagnostic diagnostic) : Exception
-{
-    public Diagnostic Diagnostic { get; } = diagnostic;
-}
-
-public static class DiagnosticFormatter
-{
-    public static void Print(Diagnostic diagnostic, TextWriter writer)
-    {
-        var (label, color) = diagnostic.Severity switch
-        {
-            Diagnostic.DiagnosticSeverity.Info => ("info", Ansi.Cyan),
-            Diagnostic.DiagnosticSeverity.Warning => ("warning", Ansi.Yellow),
-            Diagnostic.DiagnosticSeverity.Error => ("error", Ansi.Red),
-            _ => ("unknown", Ansi.Reset),
-        };
-
-        writer.Write(color);
-        writer.Write(label);
-        writer.Write(Ansi.Reset);
-        writer.Write(": ");
-        writer.WriteLine(diagnostic.Message);
-
-        if (diagnostic.File is null)
-            return;
-
-        var file = diagnostic.File;
-        var lineNumberWidth = diagnostic.File.Line.ToString().Length;
-
-        writer.WriteLine($" {new string(' ', lineNumberWidth)}{file.File}:{file.Line}:{file.Column}");
-        writer.WriteLine($"{new string(' ', lineNumberWidth)} | ");
-
-        var sourceLine = TryReadLine(file.File, file.Line);
-        if (sourceLine != null)
-        {
-            writer.Write($"{file.Line.ToString().PadLeft(lineNumberWidth)} | ");
-            writer.WriteLine(sourceLine);
-
-            writer.Write(new string(' ', lineNumberWidth));
-            writer.Write(" | ");
-            writer.Write(new string(' ', file.Column - 1));
-            writer.Write(color);
-            writer.Write(new string('^', Math.Max(1, file.Length)));
-            writer.WriteLine(Ansi.Reset);
-        }
-
-        writer.WriteLine($"{new string(' ', lineNumberWidth)} |");
-
-        if (!string.IsNullOrWhiteSpace(diagnostic.Help))
-        {
-            writer.WriteLine($"   = help: {diagnostic.Help}");
-        }
-    }
-
-    private static string? TryReadLine(string file, int line)
-    {
-        try
-        {
-            using var reader = new StreamReader(file);
-            for (var i = 1; i < line; i++)
-            {
-                if (reader.ReadLine() == null)
-                    return null;
-            }
-
-            return reader.ReadLine();
-        }
-        catch
-        {
-            return null;
-        }
-    }
-
-    private static class Ansi
-    {
-        public const string Reset = "\e[0m";
-        public const string Red = "\e[31m";
-        public const string Yellow = "\e[33m";
-        public const string Cyan = "\e[36m";
-    }
-}

compiler/ModuleGraph.cs

@@ -1,446 +0,0 @@
-using System.Diagnostics;
-using System.Diagnostics.CodeAnalysis;
-
-namespace Compiler;
-
-public class ModuleGraph
-{
-    public static Builder CreateBuilder() => new();
-
-    private ModuleGraph(Dictionary<string, Module> modules)
-    {
-        this.modules = modules;
-    }
-
-    private readonly Dictionary<string, Module> modules;
-
-    public List<Module> GetModules()
-    {
-        return modules.Values.ToList();
-    }
-
-    public bool TryResolveIdentifier(string moduleName, string identifierName, bool searchPrivate, [NotNullWhen(true)] out Module.IdentifierInfo? info)
-    {
-        if (!TryResolveModule(moduleName, out var module))
-        {
-            info = null;
-            return false;
-        }
-
-        if (!module.TryResolveIdentifier(identifierName, searchPrivate, out info))
-            return false;
-
-        return true;
-    }
-
-    public bool TryResolveType(string moduleName, string typeName, bool searchPrivate, [NotNullWhen(true)] out Module.TypeInfo? info)
-    {
-        if (!TryResolveModule(moduleName, out var module))
-        {
-            info = null;
-            return false;
-        }
-
-        if (!module.TryResolveType(typeName, searchPrivate, out info))
-            return false;
-
-        return true;
-    }
-
-    public bool TryResolveModule(string moduleName, [NotNullWhen(true)] out Module? module)
-    {
-        module = modules.GetValueOrDefault(moduleName);
-        return module != null;
-    }
-
-    public class Builder
-    {
-        private readonly List<Ast> asts = [];
-        private readonly List<Manifest> manifests = [];
-
-        public void AddAst(Ast ast)
-        {
-            asts.Add(ast);
-        }
-
-        public void AddManifest(Manifest manifest)
-        {
-            manifests.Add(manifest);
-        }
-
-        public ModuleGraph? Build(out List<Diagnostic> diagnostics)
-        {
-            diagnostics = [];
-
-            var modules = new Dictionary<string, Module>();
-
-            foreach (var manifest in manifests)
-            {
-                foreach (var (moduleName, manifestModule) in manifest.Modules)
-                {
-                    var module = GetOrCreateModule(moduleName);
-
-                    foreach (var (name, type) in manifestModule.Types)
-                    {
-                        switch (type)
-                        {
-                            case Manifest.Module.TypeInfoStruct s:
-                                {
-                                    var info = new Module.TypeInfoStruct(Module.DefinitionSource.Imported, s.Exported, s.Packed);
-                                    var fields = s.Fields.Select(x => new Module.TypeInfoStruct.Field(x.Name, x.Type)).ToList();
-                                    info.SetFields(fields);
-                                    module.AddType(name, info);
-                                    break;
-                                }
-                            case Manifest.Module.TypeInfoEnum e:
-                                {
-                                    var info = new Module.TypeInfoEnum(Module.DefinitionSource.Imported, e.Exported);
-                                    var variants = e.Variants.Select(v => new Module.TypeInfoEnum.Variant(v.Name, v.Type)).ToList();
-                                    info.SetVariants(variants);
-                                    module.AddType(name, info);
-                                    break;
-                                }
-                            default:
-                                throw new ArgumentOutOfRangeException(nameof(type));
-                        }
-                    }
-
-                    foreach (var (name, identifier) in manifestModule.Identifiers)
-                    {
-                        module.AddIdentifier(name, new Module.IdentifierInfo(Module.DefinitionSource.Imported, identifier.Exported, identifier.Extern, identifier.Type, identifier.MangledName));
-                    }
-                }
-            }
-
-            foreach (var ast in asts)
-            {
-                var module = GetOrCreateModule(ast.ModuleName.Ident);
-
-                foreach (var structDef in ast.Definitions.OfType<NodeDefinitionStruct>())
-                {
-                    module.AddType(structDef.Name.Ident, new Module.TypeInfoStruct(Module.DefinitionSource.Internal, structDef.Exported, structDef.Packed));
-                }
-
-                foreach (var enumDef in ast.Definitions.OfType<NodeDefinitionEnum>())
-                {
-                    module.AddType(enumDef.Name.Ident, new Module.TypeInfoEnum(Module.DefinitionSource.Internal, enumDef.Exported));
-                }
-            }
-
-            foreach (var ast in asts)
-            {
-                var module = GetOrCreateModule(ast.ModuleName.Ident);
-
-                foreach (var structDef in ast.Definitions.OfType<NodeDefinitionStruct>())
-                {
-                    if (!module.TryResolveType(structDef.Name.Ident, true, out var typeInfo))
-                        throw new UnreachableException($"{nameof(typeInfo)} should always be registered");
-
-                    if (typeInfo is Module.TypeInfoStruct structType)
-                    {
-                        var fields = structDef.Fields.Select(f => new Module.TypeInfoStruct.Field(f.Name.Ident, ResolveType(f.Type, module.Name))).ToList();
-                        structType.SetFields(fields);
-                    }
-                }
-
-                foreach (var enumDef in ast.Definitions.OfType<NodeDefinitionEnum>())
-                {
-                    if (!module.TryResolveType(enumDef.Name.Ident, true, out var typeInfo))
-                        throw new UnreachableException($"{nameof(typeInfo)} should always be registered");
-
-                    if (typeInfo is Module.TypeInfoEnum enumType)
-                    {
-                        var variants = enumDef.Variants.Select(v => new Module.TypeInfoEnum.Variant(v.Name.Ident, v.Type == null ? null : ResolveType(v.Type, module.Name))).ToList();
-                        enumType.SetVariants(variants);
-                    }
-                }
-            }
-
-            foreach (var ast in asts)
-            {
-                var module = GetOrCreateModule(ast.ModuleName.Ident);
-
-                foreach (var funcDef in ast.Definitions.OfType<NodeDefinitionFunc>())
-                {
-                    var parameters = funcDef.Parameters.Select(x => ResolveType(x.Type, module.Name)).ToList();
-                    var returnType = funcDef.ReturnType == null ? NubTypeVoid.Instance : ResolveType(funcDef.ReturnType, module.Name);
-                    var funcType = NubTypeFunc.Get(parameters, returnType);
-                    var info = new Module.IdentifierInfo(Module.DefinitionSource.Internal, funcDef.Exported, false, funcType, NameMangler.Mangle(module.Name, funcDef.Name.Ident, funcType));
-                    module.AddIdentifier(funcDef.Name.Ident, info);
-                }
-
-                foreach (var funcDef in ast.Definitions.OfType<NodeDefinitionExternFunc>())
-                {
-                    var parameters = funcDef.Parameters.Select(x => ResolveType(x.Type, module.Name)).ToList();
-                    var returnType = funcDef.ReturnType == null ? NubTypeVoid.Instance : ResolveType(funcDef.ReturnType, module.Name);
-                    var funcType = NubTypeFunc.Get(parameters, returnType);
-                    var info = new Module.IdentifierInfo(Module.DefinitionSource.Internal, funcDef.Exported, true, funcType, funcDef.Name.Ident);
-                    module.AddIdentifier(funcDef.Name.Ident, info);
-                }
-
-                foreach (var globalVariable in ast.Definitions.OfType<NodeDefinitionGlobalVariable>())
-                {
-                    var type = ResolveType(globalVariable.Type, module.Name);
-                    var info = new Module.IdentifierInfo(Module.DefinitionSource.Internal, globalVariable.Exported, false, type, NameMangler.Mangle(module.Name, globalVariable.Name.Ident, type));
-                    module.AddIdentifier(globalVariable.Name.Ident, info);
-                }
-
-                foreach (var globalVariable in ast.Definitions.OfType<NodeDefinitionExternGlobalVariable>())
-                {
-                    var type = ResolveType(globalVariable.Type, module.Name);
-                    var info = new Module.IdentifierInfo(Module.DefinitionSource.Internal, globalVariable.Exported, true, type, NameMangler.Mangle(module.Name, globalVariable.Name.Ident, type));
-                    module.AddIdentifier(globalVariable.Name.Ident, info);
-                }
-            }
-
-            if (diagnostics.Any(x => x.Severity == Diagnostic.DiagnosticSeverity.Error))
-                return null;
-
-            return new ModuleGraph(modules);
-
-            NubType ResolveType(NodeType node, string currentModule)
-            {
-                return node switch
-                {
-                    NodeTypeBool => NubTypeBool.Instance,
-                    NodeTypeNamed type => ResolveNamedType(type, currentModule),
-                    NodeTypeAnonymousStruct type => NubTypeAnonymousStruct.Get(type.Fields.Select(x => new NubTypeAnonymousStruct.Field(x.Name.Ident, ResolveType(x.Type, currentModule))).ToList()),
-                    NodeTypeFunc type => NubTypeFunc.Get(type.Parameters.Select(x => ResolveType(x, currentModule)).ToList(), ResolveType(type.ReturnType, currentModule)),
-                    NodeTypePointer type => NubTypePointer.Get(ResolveType(type.To, currentModule)),
-                    NodeTypeSInt type => NubTypeSInt.Get(type.Width),
-                    NodeTypeUInt type => NubTypeUInt.Get(type.Width),
-                    NodeTypeString => NubTypeString.Instance,
-                    NodeTypeChar => NubTypeChar.Instance,
-                    NodeTypeVoid => NubTypeVoid.Instance,
-                    NodeTypeArray type => NubTypeArray.Get(ResolveType(type.ElementType, currentModule)),
-                    _ => throw new ArgumentOutOfRangeException(nameof(node))
-                };
-            }
-
-            NubType ResolveNamedType(NodeTypeNamed type, string currentModule)
-            {
-                return type.Sections.Count switch
-                {
-                    3 => ResolveThreePartType(type.Sections[0], type.Sections[1], type.Sections[2], currentModule),
-                    2 => ResolveTwoPartType(type.Sections[0], type.Sections[1], currentModule),
-                    1 => ResolveOnePartType(type.Sections[0], currentModule),
-                    _ => throw BasicError("Invalid type name")
-                };
-            }
-
-            NubType ResolveThreePartType(TokenIdent first, TokenIdent second, TokenIdent third, string currentModule)
-            {
-                var module = ResolveModule(first);
-                if (!module.TryResolveType(second.Ident, currentModule == module.Name, out var typeInfo))
-                    throw BasicError($"Named type '{module.Name}::{second.Ident}' not found");
-
-                if (typeInfo is not Module.TypeInfoEnum enumInfo)
-                    throw BasicError($"'{module.Name}::{second.Ident}' is not an enum");
-
-                var variant = enumInfo.Variants.FirstOrDefault(v => v.Name == third.Ident);
-                if (variant == null)
-                    throw BasicError($"Enum '{module.Name}::{second.Ident}' does not have a variant named '{third.Ident}'");
-
-                return NubTypeEnumVariant.Get(NubTypeEnum.Get(module.Name, second.Ident), third.Ident);
-            }
-
-            NubType ResolveTwoPartType(TokenIdent first, TokenIdent second, string currentModule)
-            {
-                if (TryResolveEnumVariant(currentModule, first.Ident, second.Ident, out var variant))
-                    return variant;
-
-                var module = ResolveModule(first);
-                if (!module.TryResolveType(second.Ident, currentModule == module.Name, out var typeInfo))
-                    throw BasicError($"Named type '{module.Name}::{second.Ident}' not found");
-
-                return typeInfo switch
-                {
-                    Module.TypeInfoStruct => NubTypeStruct.Get(module.Name, second.Ident),
-                    Module.TypeInfoEnum => NubTypeEnum.Get(module.Name, second.Ident),
-                    _ => throw new ArgumentOutOfRangeException(nameof(typeInfo))
-                };
-            }
-
-            NubType ResolveOnePartType(TokenIdent name, string currentModule)
-            {
-                if (!modules.TryGetValue(currentModule, out var module))
-                    throw BasicError($"Module '{currentModule}' not found");
-
-                if (!module.TryResolveType(name.Ident, true, out var typeInfo))
-                    throw BasicError($"Named type '{module.Name}::{name.Ident}' not found");
-
-                return typeInfo switch
-                {
-                    Module.TypeInfoStruct => NubTypeStruct.Get(module.Name, name.Ident),
-                    Module.TypeInfoEnum => NubTypeEnum.Get(module.Name, name.Ident),
-                    _ => throw new ArgumentOutOfRangeException(nameof(typeInfo))
-                };
-            }
-
-            Module ResolveModule(TokenIdent name)
-            {
-                if (!modules.TryGetValue(name.Ident, out var module))
-                    throw BasicError($"Module '{name.Ident}' not found");
-
-                return module;
-            }
-
-            bool TryResolveEnumVariant(string moduleName, string enumName, string variantName, [NotNullWhen(true)] out NubType? result)
-            {
-                result = null;
-
-                if (!modules.TryGetValue(moduleName, out var module))
-                    return false;
-
-                if (!module.TryResolveType(enumName, true, out var typeInfo))
-                    return false;
-
-                if (typeInfo is not Module.TypeInfoEnum enumInfo)
-                    return false;
-
-                var variant = enumInfo.Variants.FirstOrDefault(v => v.Name == variantName);
-                if (variant == null)
-                    return false;
-
-                result = NubTypeEnumVariant.Get(
-                    NubTypeEnum.Get(moduleName, enumName),
-                    variantName);
-
-                return true;
-            }
-
-            Exception BasicError(string message)
-            {
-                return new CompileException(Diagnostic.Error(message).Build());
-            }
-
-            Module GetOrCreateModule(string name)
-            {
-                if (!modules.TryGetValue(name, out var module))
-                {
-                    module = new Module(name);
-                    modules.Add(name, module);
-                }
-
-                return module;
-            }
-        }
-    }
-}
-
-public class Module(string name)
-{
-    public string Name { get; } = name;
-
-    private Dictionary<string, TypeInfo> types = new();
-    private Dictionary<string, IdentifierInfo> identifiers = new();
-
-    public IReadOnlyDictionary<string, TypeInfo> GetTypes() => types;
-    public IReadOnlyDictionary<string, IdentifierInfo> GetIdentifiers() => identifiers;
-
-    public bool TryResolveType(string name, bool searchPrivate, [NotNullWhen(true)] out TypeInfo? customType)
-    {
-        var info = types.GetValueOrDefault(name);
-        if (info == null)
-        {
-            customType = null;
-            return false;
-        }
-
-        if (searchPrivate || info.Source == DefinitionSource.Internal)
-        {
-            customType = info;
-            return true;
-        }
-
-        customType = null;
-        return false;
-    }
-
-    public bool TryResolveIdentifier(string name, bool searchPrivate, [NotNullWhen(true)] out IdentifierInfo? identifierType)
-    {
-        var info = identifiers.GetValueOrDefault(name);
-        if (info == null)
-        {
-            identifierType = null;
-            return false;
-        }
-
-        if (searchPrivate || info.Source == DefinitionSource.Internal)
-        {
-            identifierType = info;
-            return true;
-        }
-
-        identifierType = null;
-        return false;
-    }
-
-    public void AddType(string name, TypeInfo info)
-    {
-        types.Add(name, info);
-    }
-
-    public void AddIdentifier(string name, IdentifierInfo info)
-    {
-        identifiers.Add(name, info);
-    }
-
-    public enum DefinitionSource
-    {
-        Internal,
-        Imported,
-    }
-
-    public class IdentifierInfo(DefinitionSource source, bool exported, bool @extern, NubType type, string mangledName)
-    {
-        public DefinitionSource Source { get; } = source;
-        public bool Exported { get; } = exported;
-        public bool Extern { get; } = @extern;
-        public NubType Type { get; } = type;
-        public string MangledName { get; } = mangledName;
-    }
-
-    public abstract class TypeInfo(DefinitionSource source, bool exported)
-    {
-        public DefinitionSource Source { get; } = source;
-        public bool Exported { get; } = exported;
-    }
-
-    public class TypeInfoStruct(DefinitionSource source, bool exported, bool packed) : TypeInfo(source, exported)
-    {
-        private IReadOnlyList<Field>? fields;
-
-        public bool Packed { get; } = packed;
-        public IReadOnlyList<Field> Fields => fields ?? throw new InvalidOperationException("Fields has not been set yet");
-
-        public void SetFields(IReadOnlyList<Field> fields)
-        {
-            this.fields = fields;
-        }
-
-        public class Field(string name, NubType type)
-        {
-            public string Name { get; } = name;
-            public NubType Type { get; } = type;
-        }
-    }
-
-    public class TypeInfoEnum(DefinitionSource source, bool exported) : TypeInfo(source, exported)
-    {
-        private IReadOnlyList<Variant>? variants;
-
-        public IReadOnlyList<Variant> Variants => variants ?? throw new InvalidOperationException("Fields has not been set yet");
-
-        public void SetVariants(IReadOnlyList<Variant> variants)
-        {
-            this.variants = variants;
-        }
-
-        public class Variant(string name, NubType? type)
-        {
-            public string Name { get; } = name;
-            public NubType? Type { get; } = type;
-        }
-    }
-}

compiler/NubLang.CLI/NubLang.CLI.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <AssemblyName>nubc</AssemblyName>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <PublishAot>true</PublishAot>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\NubLang\NubLang.csproj" />
+    </ItemGroup>
+
+</Project>

compiler/NubLang.CLI/Program.cs

@@ -0,0 +1,62 @@
+using NubLang.Ast;
+using NubLang.Diagnostics;
+using NubLang.Generation;
+using NubLang.Syntax;
+
+var diagnostics = new List<Diagnostic>();
+var syntaxTrees = new List<SyntaxTree>();
+
+foreach (var file in args)
+{
+    var tokenizer = new Tokenizer(file, File.ReadAllText(file));
+    tokenizer.Tokenize();
+    diagnostics.AddRange(tokenizer.Diagnostics);
+
+    var parser = new Parser();
+    var syntaxTree = parser.Parse(tokenizer.Tokens);
+    diagnostics.AddRange(parser.Diagnostics);
+
+    syntaxTrees.Add(syntaxTree);
+}
+
+var modules = Module.Collect(syntaxTrees);
+var compilationUnits = new List<List<TopLevelNode>>();
+
+for (var i = 0; i < args.Length; i++)
+{
+    var typeChecker = new TypeChecker(syntaxTrees[i], modules);
+    var compilationUnit = typeChecker.Check();
+
+    compilationUnits.Add(compilationUnit);
+    diagnostics.AddRange(typeChecker.Diagnostics);
+}
+
+foreach (var diagnostic in diagnostics)
+{
+    Console.Error.WriteLine(diagnostic.FormatANSI());
+}
+
+if (diagnostics.Any(diagnostic => diagnostic.Severity == DiagnosticSeverity.Error))
+{
+    return 1;
+}
+
+Directory.CreateDirectory(".build");
+
+for (var i = 0; i < args.Length; i++)
+{
+    var file = args[i];
+    var compilationUnit = compilationUnits[i];
+
+    var generator = new LlvmGenerator();
+    var directory = Path.GetDirectoryName(file);
+    if (!string.IsNullOrWhiteSpace(directory))
+    {
+        Directory.CreateDirectory(Path.Combine(".build", directory));
+    }
+
+    var path = Path.Combine(".build", Path.ChangeExtension(file, "ll"));
+    File.WriteAllText(path, generator.Emit(compilationUnit));
+}
+
+return 0;

compiler/NubLang.LSP/AstExtensions.cs

@@ -0,0 +1,76 @@
+using NubLang.Ast;
+using OmniSharp.Extensions.LanguageServer.Protocol.Models;
+using Range = OmniSharp.Extensions.LanguageServer.Protocol.Models.Range;
+
+namespace NubLang.LSP;
+
+public static class AstExtensions
+{
+    public static Location ToLocation(this Node node)
+    {
+        if (node.Tokens.Count == 0)
+        {
+            return new Location();
+        }
+
+        return new Location
+        {
+            Uri = node.Tokens.First().Span.FilePath,
+            Range = new Range(node.Tokens.First().Span.Start.Line - 1, node.Tokens.First().Span.Start.Column - 1, node.Tokens.Last().Span.End.Line - 1, node.Tokens.Last().Span.End.Column - 1)
+        };
+    }
+
+    public static bool ContainsPosition(this Node node, int line, int character)
+    {
+        if (node.Tokens.Count == 0)
+        {
+            return false;
+        }
+
+        var start = node.Tokens.First().Span.Start;
+        var end = node.Tokens.Last().Span.End;
+
+        var startLine = start.Line - 1;
+        var startChar = start.Column - 1;
+        var endLine = end.Line - 1;
+        var endChar = end.Column - 1;
+
+        if (line < startLine || line > endLine) return false;
+
+        if (line > startLine && line < endLine) return true;
+
+        if (startLine == endLine)
+        {
+            return character >= startChar && character <= endChar;
+        }
+
+        if (line == startLine)
+        {
+            return character >= startChar;
+        }
+
+        if (line == endLine)
+        {
+            return character <= endChar;
+        }
+
+        return false;
+    }
+
+    public static FuncNode? FunctionAtPosition(this List<TopLevelNode> compilationUnit, int line, int character)
+    {
+        return compilationUnit
+            .OfType<FuncNode>()
+            .FirstOrDefault(x => x.ContainsPosition(line, character));
+    }
+
+    public static Node? DeepestNodeAtPosition(this List<TopLevelNode> compilationUnit, int line, int character)
+    {
+        return compilationUnit
+            .SelectMany(x => x.DescendantsAndSelf())
+            .Where(n => n.ContainsPosition(line, character))
+            .OrderBy(n => n.Tokens.First().Span.Start.Line)
+            .ThenBy(n => n.Tokens.First().Span.Start.Column)
+            .LastOrDefault();
+    }
+}

compiler/NubLang.LSP/CompletionHandler.cs

@@ -0,0 +1,183 @@
+using NubLang.Ast;
+using OmniSharp.Extensions.LanguageServer.Protocol.Client.Capabilities;
+using OmniSharp.Extensions.LanguageServer.Protocol.Document;
+using OmniSharp.Extensions.LanguageServer.Protocol.Models;
+
+namespace NubLang.LSP;
+
+internal class CompletionHandler(WorkspaceManager workspaceManager) : CompletionHandlerBase
+{
+    private readonly CompletionItem[] _definitionSnippets =
+    [
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "func",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "func ${1:name}(${2:params})\n{\n    $0\n}",
+        },
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "struct",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "struct ${1:name}\n{\n    $0\n}",
+        },
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "module",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "module \"$0\"",
+        },
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "import",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "import \"$0\"",
+        }
+    ];
+
+    private readonly CompletionItem[] _statementSnippets =
+    [
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "let",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "let ${1:name} = $0",
+        },
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "if",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "if ${1:condition}\n{\n    $0\n}",
+        },
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "else if",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "else if ${1:condition}\n{\n    $0\n}",
+        },
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "else",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "else\n{\n    $0\n}",
+        },
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "while",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "while ${1:condition}\n{\n    $0\n}",
+        },
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "for",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "for ${1:name}, ${2:index} in ${3:array}\n{\n    $0\n}",
+        },
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "return",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "return $0",
+        },
+        new()
+        {
+            Kind = CompletionItemKind.Keyword,
+            Label = "defer",
+            InsertTextFormat = InsertTextFormat.Snippet,
+            InsertText = "defer $0",
+        }
+    ];
+
+    protected override CompletionRegistrationOptions CreateRegistrationOptions(CompletionCapability capability, ClientCapabilities clientCapabilities)
+    {
+        return new CompletionRegistrationOptions();
+    }
+
+    public override Task<CompletionList> Handle(CompletionParams request, CancellationToken cancellationToken)
+    {
+        return Task.FromResult(HandleSync(request, cancellationToken));
+    }
+
+    private CompletionList HandleSync(CompletionParams request, CancellationToken cancellationToken)
+    {
+        var completions = new List<CompletionItem>();
+        var position = request.Position;
+
+        var uri = request.TextDocument.Uri;
+        var compilationUnit = workspaceManager.GetCompilationUnit(uri);
+        if (compilationUnit != null)
+        {
+            var function = compilationUnit.OfType<FuncNode>().FirstOrDefault(x => x.Body != null && x.Body.ContainsPosition(position.Line, position.Character));
+            if (function != null)
+            {
+                completions.AddRange(_statementSnippets);
+
+                // foreach (var (module, prototypes) in compilationUnit.ImportedFunctions)
+                // {
+                //     foreach (var prototype in prototypes)
+                //     {
+                //         var parameterStrings = new List<string>();
+                //         foreach (var (index, parameter) in prototype.Parameters.Index())
+                //         {
+                //             parameterStrings.AddRange($"${{{index + 1}:{parameter.NameToken.Value}}}");
+                //         }
+                //
+                //         completions.Add(new CompletionItem
+                //         {
+                //             Kind = CompletionItemKind.Function,
+                //             Label = $"{module.Value}::{prototype.NameToken.Value}",
+                //             InsertTextFormat = InsertTextFormat.Snippet,
+                //             InsertText = $"{module.Value}::{prototype.NameToken.Value}({string.Join(", ", parameterStrings)})",
+                //         });
+                //     }
+                // }
+
+                foreach (var parameter in function.Prototype.Parameters)
+                {
+                    completions.Add(new CompletionItem
+                    {
+                        Kind = CompletionItemKind.Variable,
+                        Label = parameter.NameToken.Value,
+                        InsertText = parameter.NameToken.Value,
+                    });
+                }
+
+                var variables = function.Body!
+                    .Descendants()
+                    .OfType<VariableDeclarationNode>();
+
+                foreach (var variable in variables)
+                {
+                    completions.Add(new CompletionItem
+                    {
+                        Kind = CompletionItemKind.Variable,
+                        Label = variable.NameToken.Value,
+                        InsertText = variable.NameToken.Value,
+                    });
+                }
+            }
+            else
+            {
+                completions.AddRange(_definitionSnippets);
+            }
+        }
+
+        return new CompletionList(completions, false);
+    }
+
+    public override Task<CompletionItem> Handle(CompletionItem request, CancellationToken cancellationToken)
+    {
+        return Task.FromResult(new CompletionItem());
+    }
+}

compiler/NubLang.LSP/DefinitionHandler.cs

@@ -0,0 +1,79 @@
+using NubLang.Ast;
+using OmniSharp.Extensions.LanguageServer.Protocol.Client.Capabilities;
+using OmniSharp.Extensions.LanguageServer.Protocol.Document;
+using OmniSharp.Extensions.LanguageServer.Protocol.Models;
+
+namespace NubLang.LSP;
+
+internal class DefinitionHandler(WorkspaceManager workspaceManager) : DefinitionHandlerBase
+{
+    protected override DefinitionRegistrationOptions CreateRegistrationOptions(DefinitionCapability capability, ClientCapabilities clientCapabilities)
+    {
+        return new DefinitionRegistrationOptions();
+    }
+
+    public override Task<LocationOrLocationLinks?> Handle(DefinitionParams request, CancellationToken cancellationToken)
+    {
+        return Task.FromResult(HandleSync(request, cancellationToken));
+    }
+
+    private LocationOrLocationLinks? HandleSync(DefinitionParams request, CancellationToken cancellationToken)
+    {
+        var uri = request.TextDocument.Uri;
+        var compilationUnit = workspaceManager.GetCompilationUnit(uri);
+        if (compilationUnit == null)
+        {
+            return null;
+        }
+
+        var line = request.Position.Line;
+        var character = request.Position.Character;
+
+        var node = compilationUnit.DeepestNodeAtPosition(line, character);
+
+        switch (node)
+        {
+            case VariableIdentifierNode variableIdentifierNode:
+            {
+                var function = compilationUnit.FunctionAtPosition(line, character);
+
+                var parameter = function?.Prototype.Parameters.FirstOrDefault(x => x.NameToken.Value == variableIdentifierNode.NameToken.Value);
+                if (parameter != null)
+                {
+                    return new LocationOrLocationLinks(parameter.ToLocation());
+                }
+
+                var variable = function?.Body?
+                    .Descendants()
+                    .OfType<VariableDeclarationNode>()
+                    .FirstOrDefault(x => x.NameToken.Value == variableIdentifierNode.NameToken.Value);
+
+                if (variable != null)
+                {
+                    return new LocationOrLocationLinks(variable.ToLocation());
+                }
+
+                return null;
+            }
+            case FuncIdentifierNode funcIdentifierNode:
+            {
+                // var prototype = compilationUnit
+                //     .ImportedFunctions
+                //     .Where(x => x.Key.Value == funcIdentifierNode.ModuleToken.Value)
+                //     .SelectMany(x => x.Value)
+                //     .FirstOrDefault(x => x.NameToken.Value == funcIdentifierNode.NameToken.Value);
+                //
+                // if (prototype != null)
+                // {
+                //     return new LocationOrLocationLinks(prototype.ToLocation());
+                // }
+
+                return null;
+            }
+            default:
+            {
+                return null;
+            }
+        }
+    }
+}

compiler/NubLang.LSP/DiagnosticsPublisher.cs

@@ -0,0 +1,44 @@
+using OmniSharp.Extensions.LanguageServer.Protocol;
+using OmniSharp.Extensions.LanguageServer.Protocol.Document;
+using OmniSharp.Extensions.LanguageServer.Protocol.Models;
+using OmniSharp.Extensions.LanguageServer.Protocol.Server;
+using Range = OmniSharp.Extensions.LanguageServer.Protocol.Models.Range;
+
+namespace NubLang.LSP;
+
+public class DiagnosticsPublisher
+{
+    private readonly ILanguageServerFacade _server;
+
+    public DiagnosticsPublisher(ILanguageServerFacade server)
+    {
+        _server = server;
+    }
+
+    public void Publish(DocumentUri uri, IEnumerable<Diagnostics.Diagnostic> diagnostics)
+    {
+        _server.TextDocument.PublishDiagnostics(new PublishDiagnosticsParams
+        {
+            Uri = uri,
+            Diagnostics = new Container<Diagnostic>(diagnostics.Select(MapDiagnostic))
+        });
+    }
+
+    private static Diagnostic MapDiagnostic(Diagnostics.Diagnostic nubDiagnostic)
+    {
+        return new Diagnostic
+        {
+            Severity = nubDiagnostic.Severity switch
+            {
+                Diagnostics.DiagnosticSeverity.Info => DiagnosticSeverity.Information,
+                Diagnostics.DiagnosticSeverity.Warning => DiagnosticSeverity.Warning,
+                Diagnostics.DiagnosticSeverity.Error => DiagnosticSeverity.Error,
+                _ => null
+            },
+            Message = $"{nubDiagnostic.Message}\n{(nubDiagnostic.Help == null ? "" : $"help: {nubDiagnostic.Help}")}",
+            Range = nubDiagnostic.Span.HasValue
+                ? new Range(nubDiagnostic.Span.Value.Start.Line - 1, nubDiagnostic.Span.Value.Start.Column - 1, nubDiagnostic.Span.Value.End.Line - 1, nubDiagnostic.Span.Value.End.Column - 1)
+                : new Range(),
+        };
+    }
+}

compiler/NubLang.LSP/HoverHandler.cs

@@ -0,0 +1,148 @@
+using System.Globalization;
+using NubLang.Ast;
+using OmniSharp.Extensions.LanguageServer.Protocol.Client.Capabilities;
+using OmniSharp.Extensions.LanguageServer.Protocol.Document;
+using OmniSharp.Extensions.LanguageServer.Protocol.Models;
+
+namespace NubLang.LSP;
+
+internal class HoverHandler(WorkspaceManager workspaceManager) : HoverHandlerBase
+{
+    protected override HoverRegistrationOptions CreateRegistrationOptions(HoverCapability capability, ClientCapabilities clientCapabilities)
+    {
+        return new HoverRegistrationOptions
+        {
+            DocumentSelector = TextDocumentSelector.ForLanguage("nub")
+        };
+    }
+
+    public override Task<Hover?> Handle(HoverParams request, CancellationToken cancellationToken)
+    {
+        return Task.FromResult(HandleSync(request, cancellationToken));
+    }
+
+    private Hover? HandleSync(HoverParams request, CancellationToken cancellationToken)
+    {
+        var compilationUnit = workspaceManager.GetCompilationUnit(request.TextDocument.Uri);
+        if (compilationUnit == null)
+        {
+            return null;
+        }
+
+        var line = request.Position.Line;
+        var character = request.Position.Character;
+
+        var hoveredNode = compilationUnit.DeepestNodeAtPosition(line, character);
+
+        if (hoveredNode == null)
+        {
+            return null;
+        }
+
+        // var message = CreateMessage(hoveredNode, compilationUnit);
+        // if (message == null)
+        // {
+        //     return null;
+        // }
+        //
+        // return new Hover
+        // {
+        //     Contents = new MarkedStringsOrMarkupContent(new MarkupContent
+        //     {
+        //         Value = message,
+        //         Kind = MarkupKind.Markdown,
+        //     })
+        // };
+
+        return null;
+    }
+
+//     private static string? CreateMessage(Node hoveredNode, CompilationUnit compilationUnit)
+//     {
+//         return hoveredNode switch
+//         {
+//             FuncNode funcNode => CreateFuncPrototypeMessage(funcNode.Prototype),
+//             FuncPrototypeNode funcPrototypeNode => CreateFuncPrototypeMessage(funcPrototypeNode),
+//             FuncIdentifierNode funcIdentifierNode => CreateFuncIdentifierMessage(funcIdentifierNode, compilationUnit),
+//             FuncParameterNode funcParameterNode => CreateTypeNameMessage("Function parameter", funcParameterNode.NameToken.Value, funcParameterNode.Type),
+//             VariableIdentifierNode variableIdentifierNode => CreateTypeNameMessage("Variable", variableIdentifierNode.NameToken.Value, variableIdentifierNode.Type),
+//             VariableDeclarationNode variableDeclarationNode => CreateTypeNameMessage("Variable declaration", variableDeclarationNode.NameToken.Value, variableDeclarationNode.Type),
+//             StructFieldAccessNode structFieldAccessNode => CreateTypeNameMessage("Struct field", $"{structFieldAccessNode.Target.Type}.{structFieldAccessNode.FieldToken.Value}", structFieldAccessNode.Type),
+//             CStringLiteralNode cStringLiteralNode => CreateLiteralMessage(cStringLiteralNode.Type, '"' + cStringLiteralNode.Value + '"'),
+//             StringLiteralNode stringLiteralNode => CreateLiteralMessage(stringLiteralNode.Type, '"' + stringLiteralNode.Value + '"'),
+//             BoolLiteralNode boolLiteralNode => CreateLiteralMessage(boolLiteralNode.Type, boolLiteralNode.Value.ToString()),
+//             Float32LiteralNode float32LiteralNode => CreateLiteralMessage(float32LiteralNode.Type, float32LiteralNode.Value.ToString(CultureInfo.InvariantCulture)),
+//             Float64LiteralNode float64LiteralNode => CreateLiteralMessage(float64LiteralNode.Type, float64LiteralNode.Value.ToString(CultureInfo.InvariantCulture)),
+//             I8LiteralNode i8LiteralNode => CreateLiteralMessage(i8LiteralNode.Type, i8LiteralNode.Value.ToString()),
+//             I16LiteralNode i16LiteralNode => CreateLiteralMessage(i16LiteralNode.Type, i16LiteralNode.Value.ToString()),
+//             I32LiteralNode i32LiteralNode => CreateLiteralMessage(i32LiteralNode.Type, i32LiteralNode.Value.ToString()),
+//             I64LiteralNode i64LiteralNode => CreateLiteralMessage(i64LiteralNode.Type, i64LiteralNode.Value.ToString()),
+//             U8LiteralNode u8LiteralNode => CreateLiteralMessage(u8LiteralNode.Type, u8LiteralNode.Value.ToString()),
+//             U16LiteralNode u16LiteralNode => CreateLiteralMessage(u16LiteralNode.Type, u16LiteralNode.Value.ToString()),
+//             U32LiteralNode u32LiteralNode => CreateLiteralMessage(u32LiteralNode.Type, u32LiteralNode.Value.ToString()),
+//             U64LiteralNode u64LiteralNode => CreateLiteralMessage(u64LiteralNode.Type, u64LiteralNode.Value.ToString()),
+//             // Expressions can have a generic fallback showing the resulting type
+//             ExpressionNode expressionNode => $"""
+//                                               **Expression** `{expressionNode.GetType().Name}`
+//                                               ```nub
+//                                               {expressionNode.Type}
+//                                               ```
+//                                               """,
+//             BlockNode => null,
+//             _ => hoveredNode.GetType().Name
+//         };
+//     }
+//
+//     private static string CreateLiteralMessage(NubType type, string value)
+//     {
+//         return $"""
+//                 **Literal** `{type}`
+//                 ```nub
+//                 {value}: {type}
+//                 ```
+//                 """;
+//     }
+//
+//     private static string CreateTypeNameMessage(string description, string name, NubType type)
+//     {
+//         return $"""
+//                 **{description}** `{name}`
+//                 ```nub
+//                 {name}: {type}
+//                 ```
+//                 """;
+//     }
+//
+//     private static string CreateFuncIdentifierMessage(FuncIdentifierNode funcIdentifierNode, CompilationUnit compilationUnit)
+//     {
+//         var func = compilationUnit.ImportedFunctions
+//             .Where(x => x.Key.Value == funcIdentifierNode.ModuleToken.Value)
+//             .SelectMany(x => x.Value)
+//             .FirstOrDefault(x => x.NameToken.Value == funcIdentifierNode.NameToken.Value);
+//
+//         if (func == null)
+//         {
+//             return $"""
+//                     **Function** `{funcIdentifierNode.ModuleToken.Value}::{funcIdentifierNode.NameToken.Value}`
+//                     ```nub
+//                     // Declaration not found
+//                     ```
+//                     """;
+//         }
+//
+//         return CreateFuncPrototypeMessage(func);
+//     }
+//
+//     private static string CreateFuncPrototypeMessage(FuncPrototypeNode funcPrototypeNode)
+//     {
+//         var parameterText = string.Join(", ", funcPrototypeNode.Parameters.Select(x => $"{x.NameToken.Value}: {x.Type}"));
+//         var externText = funcPrototypeNode.ExternSymbolToken != null ? $"extern \"{funcPrototypeNode.ExternSymbolToken.Value}\" " : "";
+//
+//         return $"""
+//                 **Function** `{funcPrototypeNode.NameToken.Value}`
+//                 ```nub
+//                 {externText}func {funcPrototypeNode.NameToken.Value}({parameterText}): {funcPrototypeNode.ReturnType}
+//                 ```
+//                 """;
+//     }
+}

compiler/NubLang.LSP/NubLang.LSP.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <AssemblyName>nublsp</AssemblyName>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <SelfContained>true</SelfContained>
+        <PublishSingleFile>true</PublishSingleFile>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="OmniSharp.Extensions.LanguageServer" Version="0.19.9" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\NubLang\NubLang.csproj" />
+    </ItemGroup>
+
+</Project>

compiler/NubLang.LSP/Program.cs

@@ -0,0 +1,34 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using NubLang.LSP;
+using OmniSharp.Extensions.LanguageServer.Server;
+
+var server = await LanguageServer.From(options => options
+    .WithInput(Console.OpenStandardInput())
+    .WithOutput(Console.OpenStandardOutput())
+    .WithServices(services =>
+    {
+        services.AddSingleton<DiagnosticsPublisher>();
+        services.AddSingleton<WorkspaceManager>();
+    })
+    .ConfigureLogging(x => x
+        .AddLanguageProtocolLogging()
+        .SetMinimumLevel(LogLevel.Debug))
+    .WithHandler<TextDocumentSyncHandler>()
+    .WithHandler<HoverHandler>()
+    .WithHandler<CompletionHandler>()
+    .WithHandler<DefinitionHandler>()
+    .OnInitialize((server, request, ct) =>
+    {
+        var workspaceManager = server.GetRequiredService<WorkspaceManager>();
+
+        if (request.RootPath != null)
+        {
+            workspaceManager.Init(request.RootPath);
+        }
+
+        return Task.CompletedTask;
+    })
+);
+
+await server.WaitForExit;

compiler/NubLang.LSP/TextDocumentSyncHandler.cs

@@ -0,0 +1,44 @@
+using MediatR;
+using OmniSharp.Extensions.LanguageServer.Protocol;
+using OmniSharp.Extensions.LanguageServer.Protocol.Client.Capabilities;
+using OmniSharp.Extensions.LanguageServer.Protocol.Document;
+using OmniSharp.Extensions.LanguageServer.Protocol.Models;
+
+namespace NubLang.LSP;
+
+internal class TextDocumentSyncHandler(WorkspaceManager workspaceManager) : TextDocumentSyncHandlerBase
+{
+    public override TextDocumentAttributes GetTextDocumentAttributes(DocumentUri uri)
+    {
+        return new TextDocumentAttributes(uri, "nub");
+    }
+
+    public override Task<Unit> Handle(DidOpenTextDocumentParams request, CancellationToken cancellationToken)
+    {
+        workspaceManager.UpdateFile(request.TextDocument.Uri.GetFileSystemPath());
+        return Unit.Task;
+    }
+
+    public override Task<Unit> Handle(DidChangeTextDocumentParams request, CancellationToken cancellationToken)
+    {
+        workspaceManager.UpdateFile(request.TextDocument.Uri.GetFileSystemPath());
+        return Unit.Task;
+    }
+
+    public override Task<Unit> Handle(DidSaveTextDocumentParams request, CancellationToken cancellationToken)
+    {
+        workspaceManager.UpdateFile(request.TextDocument.Uri.GetFileSystemPath());
+        return Unit.Task;
+    }
+
+    public override Task<Unit> Handle(DidCloseTextDocumentParams request, CancellationToken cancellationToken)
+    {
+        workspaceManager.UpdateFile(request.TextDocument.Uri.GetFileSystemPath());
+        return Unit.Task;
+    }
+
+    protected override TextDocumentSyncRegistrationOptions CreateRegistrationOptions(TextSynchronizationCapability capability, ClientCapabilities clientCapabilities)
+    {
+        return new TextDocumentSyncRegistrationOptions();
+    }
+}

compiler/NubLang.LSP/WorkspaceManager.cs

@@ -0,0 +1,77 @@
+using NubLang.Ast;
+using NubLang.Syntax;
+using OmniSharp.Extensions.LanguageServer.Protocol;
+
+namespace NubLang.LSP;
+
+public class WorkspaceManager(DiagnosticsPublisher diagnosticsPublisher)
+{
+    private readonly Dictionary<string, SyntaxTree> _syntaxTrees = new();
+    private readonly Dictionary<string, List<TopLevelNode>> _compilationUnits = new();
+    private readonly Dictionary<string, TypedModule> _modules = new();
+
+    public void Init(string rootPath)
+    {
+        var files = Directory.GetFiles(rootPath, "*.nub", SearchOption.AllDirectories);
+        foreach (var path in files)
+        {
+            var text = File.ReadAllText(path);
+            var tokenizer = new Tokenizer(path, text);
+
+            tokenizer.Tokenize();
+            diagnosticsPublisher.Publish(path, tokenizer.Diagnostics);
+
+            var parser = new Parser();
+            var parseResult = parser.Parse(tokenizer.Tokens);
+            diagnosticsPublisher.Publish(path, parser.Diagnostics);
+
+            _syntaxTrees[path] = parseResult;
+        }
+
+        foreach (var (fsPath, syntaxTree) in _syntaxTrees)
+        {
+            var modules = Module.Collect(_syntaxTrees.Select(x => x.Value).ToList());
+
+            var typeChecker = new TypeChecker(syntaxTree, modules);
+            var result = typeChecker.Check();
+            diagnosticsPublisher.Publish(fsPath, typeChecker.Diagnostics);
+
+            _compilationUnits[fsPath] = result;
+        }
+    }
+
+    public void UpdateFile(DocumentUri path)
+    {
+        var fsPath = path.GetFileSystemPath();
+
+        var text = File.ReadAllText(fsPath);
+        var tokenizer = new Tokenizer(fsPath, text);
+        tokenizer.Tokenize();
+        diagnosticsPublisher.Publish(path, tokenizer.Diagnostics);
+
+        var parser = new Parser();
+        var syntaxTree = parser.Parse(tokenizer.Tokens);
+        diagnosticsPublisher.Publish(path, parser.Diagnostics);
+        _syntaxTrees[fsPath] = syntaxTree;
+
+        var modules = Module.Collect(_syntaxTrees.Select(x => x.Value).ToList());
+
+        var typeChecker = new TypeChecker(syntaxTree, modules);
+        var result = typeChecker.Check();
+        diagnosticsPublisher.Publish(fsPath, typeChecker.Diagnostics);
+
+        _compilationUnits[fsPath] = result;
+    }
+
+    public void RemoveFile(DocumentUri path)
+    {
+        var fsPath = path.GetFileSystemPath();
+        _syntaxTrees.Remove(fsPath);
+        _compilationUnits.Remove(fsPath);
+    }
+
+    public List<TopLevelNode>? GetCompilationUnit(DocumentUri path)
+    {
+        return _compilationUnits.GetValueOrDefault(path.GetFileSystemPath());
+    }
+}

compiler/NubLang/Ast/CompilationUnit.cs

@@ -0,0 +1,12 @@
+using NubLang.Syntax;
+
+namespace NubLang.Ast;
+
+// public sealed class CompilationUnit(IdentifierToken module, List<FuncNode> functions, List<StructNode> structTypes, Dictionary<IdentifierToken, List<NubStructType>> importedStructTypes, Dictionary<IdentifierToken, List<FuncPrototypeNode>> importedFunctions)
+// {
+//     public IdentifierToken Module { get; } = module;
+//     public List<FuncNode> Functions { get; } = functions;
+//     public List<StructNode> Structs { get; } = structTypes;
+//     public Dictionary<IdentifierToken, List<NubStructType>> ImportedStructTypes { get; } = importedStructTypes;
+//     public Dictionary<IdentifierToken, List<FuncPrototypeNode>> ImportedFunctions { get; } = importedFunctions;
+// }

compiler/NubLang/Ast/Node.cs

@@ -0,0 +1,628 @@
+using NubLang.Syntax;
+
+namespace NubLang.Ast;
+
+public abstract class Node(List<Token> tokens)
+{
+    public List<Token> Tokens { get; } = tokens;
+
+    public abstract IEnumerable<Node> Children();
+
+    public IEnumerable<Node> Descendants()
+    {
+        foreach (var child in Children())
+        {
+            foreach (var descendant in child.DescendantsAndSelf())
+            {
+                yield return descendant;
+            }
+        }
+    }
+
+    public IEnumerable<Node> DescendantsAndSelf()
+    {
+        yield return this;
+        foreach (var descendant in Descendants())
+        {
+            yield return descendant;
+        }
+    }
+}
+
+public abstract class TopLevelNode(List<Token> tokens) : Node(tokens);
+
+public class ImportNode(List<Token> tokens, IdentifierToken nameToken) : TopLevelNode(tokens)
+{
+    public IdentifierToken NameToken { get; } = nameToken;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class ModuleNode(List<Token> tokens, IdentifierToken nameToken) : TopLevelNode(tokens)
+{
+    public IdentifierToken NameToken { get; } = nameToken;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+#region Definitions
+
+public abstract class DefinitionNode(List<Token> tokens, IdentifierToken nameToken) : TopLevelNode(tokens)
+{
+    public IdentifierToken NameToken { get; } = nameToken;
+}
+
+public class FuncParameterNode(List<Token> tokens, IdentifierToken nameToken, NubType type) : Node(tokens)
+{
+    public IdentifierToken NameToken { get; } = nameToken;
+    public NubType Type { get; } = type;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class FuncPrototypeNode(List<Token> tokens, IdentifierToken nameToken, StringLiteralToken? externSymbolToken, List<FuncParameterNode> parameters, NubType returnType) : Node(tokens)
+{
+    public IdentifierToken NameToken { get; } = nameToken;
+    public StringLiteralToken? ExternSymbolToken { get; } = externSymbolToken;
+    public List<FuncParameterNode> Parameters { get; } = parameters;
+    public NubType ReturnType { get; } = returnType;
+
+    public override IEnumerable<Node> Children()
+    {
+        return Parameters;
+    }
+}
+
+public class FuncNode(List<Token> tokens, FuncPrototypeNode prototype, BlockNode? body) : DefinitionNode(tokens, prototype.NameToken)
+{
+    public FuncPrototypeNode Prototype { get; } = prototype;
+    public BlockNode? Body { get; } = body;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Prototype;
+        if (Body != null)
+        {
+            yield return Body;
+        }
+    }
+}
+
+public class StructFieldNode(List<Token> tokens, IdentifierToken nameToken, NubType type, ExpressionNode? value) : Node(tokens)
+{
+    public IdentifierToken NameToken { get; } = nameToken;
+    public NubType Type { get; } = type;
+    public ExpressionNode? Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        if (Value != null)
+        {
+            yield return Value;
+        }
+    }
+}
+
+public class StructNode(List<Token> tokens, IdentifierToken name, NubStructType structType, bool packed, List<StructFieldNode> fields) : DefinitionNode(tokens, name)
+{
+    public NubStructType StructType { get; } = structType;
+    public bool Packed { get; } = packed;
+    public List<StructFieldNode> Fields { get; } = fields;
+
+    public override IEnumerable<Node> Children()
+    {
+        foreach (var field in Fields)
+        {
+            yield return field;
+        }
+    }
+}
+
+#endregion
+
+#region Statements
+
+public abstract class StatementNode(List<Token> tokens) : Node(tokens);
+
+public class BlockNode(List<Token> tokens, List<StatementNode> statements) : StatementNode(tokens)
+{
+    public List<StatementNode> Statements { get; } = statements;
+
+    public override IEnumerable<Node> Children()
+    {
+        return Statements;
+    }
+}
+
+public class StatementFuncCallNode(List<Token> tokens, FuncCallNode funcCall) : StatementNode(tokens)
+{
+    public FuncCallNode FuncCall { get; } = funcCall;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return FuncCall;
+    }
+}
+
+public class ReturnNode(List<Token> tokens, ExpressionNode? value) : StatementNode(tokens)
+{
+    public ExpressionNode? Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        if (Value != null) yield return Value;
+    }
+}
+
+public class AssignmentNode(List<Token> tokens, ExpressionNode target, ExpressionNode value) : StatementNode(tokens)
+{
+    public ExpressionNode Target { get; } = target;
+    public ExpressionNode Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Target;
+        yield return Value;
+    }
+}
+
+public class IfNode(List<Token> tokens, ExpressionNode condition, BlockNode body, Variant<IfNode, BlockNode>? @else) : StatementNode(tokens)
+{
+    public ExpressionNode Condition { get; } = condition;
+    public BlockNode Body { get; } = body;
+    public Variant<IfNode, BlockNode>? Else { get; } = @else;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Condition;
+        yield return Body;
+        if (Else.HasValue)
+        {
+            yield return Else.Value.Match<Node>(x => x, x => x);
+        }
+    }
+}
+
+public class VariableDeclarationNode(List<Token> tokens, IdentifierToken nameToken, ExpressionNode? assignment, NubType type) : StatementNode(tokens)
+{
+    public IdentifierToken NameToken { get; } = nameToken;
+    public ExpressionNode? Assignment { get; } = assignment;
+    public NubType Type { get; } = type;
+
+    public override IEnumerable<Node> Children()
+    {
+        if (Assignment != null) yield return Assignment;
+    }
+}
+
+public class ContinueNode(List<Token> tokens) : StatementNode(tokens)
+{
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class BreakNode(List<Token> tokens) : StatementNode(tokens)
+{
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class WhileNode(List<Token> tokens, ExpressionNode condition, BlockNode body) : StatementNode(tokens)
+{
+    public ExpressionNode Condition { get; } = condition;
+    public BlockNode Body { get; } = body;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Condition;
+        yield return Body;
+    }
+}
+
+public class ForSliceNode(List<Token> tokens, IdentifierToken elementNameToken, IdentifierToken? indexNameToken, ExpressionNode target, BlockNode body) : StatementNode(tokens)
+{
+    public IdentifierToken ElementNameToken { get; } = elementNameToken;
+    public IdentifierToken? IndexNameToken { get; } = indexNameToken;
+    public ExpressionNode Target { get; } = target;
+    public BlockNode Body { get; } = body;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Target;
+        yield return Body;
+    }
+}
+
+public class ForConstArrayNode(List<Token> tokens, IdentifierToken elementNameToken, IdentifierToken? indexNameToken, ExpressionNode target, BlockNode body) : StatementNode(tokens)
+{
+    public IdentifierToken ElementNameToken { get; } = elementNameToken;
+    public IdentifierToken? IndexNameToken { get; } = indexNameToken;
+    public ExpressionNode Target { get; } = target;
+    public BlockNode Body { get; } = body;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Target;
+        yield return Body;
+    }
+}
+
+public class DeferNode(List<Token> tokens, StatementNode statement) : StatementNode(tokens)
+{
+    public StatementNode Statement { get; } = statement;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Statement;
+    }
+}
+
+#endregion
+
+#region Expressions
+
+public enum UnaryOperator
+{
+    Negate,
+    Invert
+}
+
+public enum BinaryOperator
+{
+    Equal,
+    NotEqual,
+    GreaterThan,
+    GreaterThanOrEqual,
+    LessThan,
+    LessThanOrEqual,
+    LogicalAnd,
+    LogicalOr,
+    Plus,
+    Minus,
+    Multiply,
+    Divide,
+    Modulo,
+    LeftShift,
+    RightShift,
+    BitwiseAnd,
+    BitwiseXor,
+    BitwiseOr
+}
+
+public abstract class ExpressionNode(List<Token> tokens, NubType type) : Node(tokens)
+{
+    public NubType Type { get; } = type;
+}
+
+public abstract class LValue(List<Token> tokens, NubType type) : ExpressionNode(tokens, type);
+
+public abstract class RValue(List<Token> tokens, NubType type) : ExpressionNode(tokens, type);
+
+public class StringLiteralNode(List<Token> tokens, string value) : RValue(tokens, new NubStringType())
+{
+    public string Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class CStringLiteralNode(List<Token> tokens, string value) : RValue(tokens, new NubPointerType(new NubIntType(true, 8)))
+{
+    public string Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class I8LiteralNode(List<Token> tokens, sbyte value) : RValue(tokens, new NubIntType(true, 8))
+{
+    public sbyte Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class I16LiteralNode(List<Token> tokens, short value) : RValue(tokens, new NubIntType(true, 16))
+{
+    public short Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class I32LiteralNode(List<Token> tokens, int value) : RValue(tokens, new NubIntType(true, 32))
+{
+    public int Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class I64LiteralNode(List<Token> tokens, long value) : RValue(tokens, new NubIntType(true, 64))
+{
+    public long Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class U8LiteralNode(List<Token> tokens, byte value) : RValue(tokens, new NubIntType(false, 8))
+{
+    public byte Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class U16LiteralNode(List<Token> tokens, ushort value) : RValue(tokens, new NubIntType(false, 16))
+{
+    public ushort Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class U32LiteralNode(List<Token> tokens, uint value) : RValue(tokens, new NubIntType(false, 32))
+{
+    public uint Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class U64LiteralNode(List<Token> tokens, ulong value) : RValue(tokens, new NubIntType(false, 64))
+{
+    public ulong Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class Float32LiteralNode(List<Token> tokens, float value) : RValue(tokens, new NubFloatType(32))
+{
+    public float Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class Float64LiteralNode(List<Token> tokens, double value) : RValue(tokens, new NubFloatType(64))
+{
+    public double Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class BoolLiteralNode(List<Token> tokens, bool value) : RValue(tokens, new NubBoolType())
+{
+    public bool Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class BinaryExpressionNode(List<Token> tokens, NubType type, ExpressionNode left, BinaryOperator @operator, ExpressionNode right) : RValue(tokens, type)
+{
+    public ExpressionNode Left { get; } = left;
+    public BinaryOperator Operator { get; } = @operator;
+    public ExpressionNode Right { get; } = right;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Left;
+        yield return Right;
+    }
+}
+
+public class UnaryExpressionNode(List<Token> tokens, NubType type, UnaryOperator @operator, ExpressionNode operand) : RValue(tokens, type)
+{
+    public UnaryOperator Operator { get; } = @operator;
+    public ExpressionNode Operand { get; } = operand;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Operand;
+    }
+}
+
+public class FuncCallNode(List<Token> tokens, NubType type, ExpressionNode expression, List<ExpressionNode> parameters) : RValue(tokens, type)
+{
+    public ExpressionNode Expression { get; } = expression;
+    public List<ExpressionNode> Parameters { get; } = parameters;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Expression;
+        foreach (var expressionNode in Parameters)
+        {
+            yield return expressionNode;
+        }
+    }
+}
+
+public class VariableIdentifierNode(List<Token> tokens, NubType type, IdentifierToken nameToken) : LValue(tokens, type)
+{
+    public IdentifierToken NameToken { get; } = nameToken;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class FuncIdentifierNode(List<Token> tokens, NubType type, IdentifierToken moduleToken, IdentifierToken nameToken, StringLiteralToken? externSymbolToken) : RValue(tokens, type)
+{
+    public IdentifierToken ModuleToken { get; } = moduleToken;
+    public IdentifierToken NameToken { get; } = nameToken;
+    public StringLiteralToken? ExternSymbolToken { get; } = externSymbolToken;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class ArrayIndexAccessNode(List<Token> tokens, NubType type, ExpressionNode target, ExpressionNode index) : LValue(tokens, type)
+{
+    public ExpressionNode Target { get; } = target;
+    public ExpressionNode Index { get; } = index;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Target;
+        yield return Index;
+    }
+}
+
+public class ConstArrayIndexAccessNode(List<Token> tokens, NubType type, ExpressionNode target, ExpressionNode index) : LValue(tokens, type)
+{
+    public ExpressionNode Target { get; } = target;
+    public ExpressionNode Index { get; } = index;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Target;
+        yield return Index;
+    }
+}
+
+public class SliceIndexAccessNode(List<Token> tokens, NubType type, ExpressionNode target, ExpressionNode index) : LValue(tokens, type)
+{
+    public ExpressionNode Target { get; } = target;
+    public ExpressionNode Index { get; } = index;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Target;
+        yield return Index;
+    }
+}
+
+public class AddressOfNode(List<Token> tokens, NubType type, ExpressionNode target) : RValue(tokens, type)
+{
+    public ExpressionNode Target { get; } = target;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Target;
+    }
+}
+
+public class StructFieldAccessNode(List<Token> tokens, NubType type, ExpressionNode target, IdentifierToken fieldToken) : LValue(tokens, type)
+{
+    public ExpressionNode Target { get; } = target;
+    public IdentifierToken FieldToken { get; } = fieldToken;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Target;
+    }
+}
+
+public class DereferenceNode(List<Token> tokens, NubType type, ExpressionNode target) : LValue(tokens, type)
+{
+    public ExpressionNode Target { get; } = target;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Target;
+    }
+}
+
+public class SizeNode(List<Token> tokens, NubType targetType) : RValue(tokens, new NubIntType(false, 64))
+{
+    public NubType TargetType { get; } = targetType;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+public class CastNode(List<Token> tokens, NubType type, ExpressionNode value) : RValue(tokens, type)
+{
+    public ExpressionNode Value { get; } = value;
+
+    public override IEnumerable<Node> Children()
+    {
+        yield return Value;
+    }
+}
+
+public class StructInitializerNode(List<Token> tokens, NubType type, Dictionary<IdentifierToken, ExpressionNode> initializers) : RValue(tokens, type)
+{
+    public Dictionary<IdentifierToken, ExpressionNode> Initializers { get; } = initializers;
+
+    public override IEnumerable<Node> Children()
+    {
+        foreach (var initializer in Initializers)
+        {
+            yield return initializer.Value;
+        }
+    }
+}
+
+public class ConstArrayInitializerNode(List<Token> tokens, NubType type, List<ExpressionNode> values) : RValue(tokens, type)
+{
+    public List<ExpressionNode> Values { get; } = values;
+
+    public override IEnumerable<Node> Children()
+    {
+        return Values;
+    }
+}
+
+public abstract class IntermediateExpression(List<Token> tokens) : ExpressionNode(tokens, new NubVoidType());
+
+public class EnumReferenceIntermediateNode(List<Token> tokens, IdentifierToken moduleToken, IdentifierToken nameToken) : IntermediateExpression(tokens)
+{
+    public IdentifierToken ModuleToken { get; } = moduleToken;
+    public IdentifierToken NameToken { get; } = nameToken;
+
+    public override IEnumerable<Node> Children()
+    {
+        return [];
+    }
+}
+
+#endregion

compiler/NubLang/Ast/NubType.cs

@@ -0,0 +1,267 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace NubLang.Ast;
+
+public abstract class NubType : IEquatable<NubType>
+{
+    public abstract ulong GetSize();
+    public abstract ulong GetAlignment();
+    public abstract bool IsAggregate();
+
+    public override bool Equals(object? obj) => obj is NubType other && Equals(other);
+    public abstract bool Equals(NubType? other);
+
+    public abstract override int GetHashCode();
+    public abstract override string ToString();
+
+    public static bool operator ==(NubType? left, NubType? right) => Equals(left, right);
+    public static bool operator !=(NubType? left, NubType? right) => !Equals(left, right);
+}
+
+public class NubVoidType : NubType
+{
+    public override ulong GetSize() => 8;
+    public override ulong GetAlignment() => 8;
+    public override bool IsAggregate() => false;
+
+    public override string ToString() => "void";
+    public override bool Equals(NubType? other) => other is NubVoidType;
+    public override int GetHashCode() => HashCode.Combine(typeof(NubVoidType));
+}
+
+public sealed class NubIntType(bool signed, ulong width) : NubType
+{
+    public bool Signed { get; } = signed;
+    public ulong Width { get; } = width;
+
+    public override ulong GetSize() => Width / 8;
+    public override ulong GetAlignment() => Width / 8;
+    public override bool IsAggregate() => false;
+
+    public override string ToString() => $"{(Signed ? "i" : "u")}{Width}";
+    public override bool Equals(NubType? other) => other is NubIntType @int && @int.Width == Width && @int.Signed == Signed;
+    public override int GetHashCode() => HashCode.Combine(typeof(NubIntType), Signed, Width);
+}
+
+public sealed class NubFloatType(ulong width) : NubType
+{
+    public ulong Width { get; } = width;
+
+    public override ulong GetSize() => Width / 8;
+    public override ulong GetAlignment() => Width / 8;
+    public override bool IsAggregate() => false;
+
+    public override string ToString() => $"f{Width}";
+    public override bool Equals(NubType? other) => other is NubFloatType @float && @float.Width == Width;
+    public override int GetHashCode() => HashCode.Combine(typeof(NubFloatType), Width);
+}
+
+public class NubBoolType : NubType
+{
+    public override ulong GetSize() => 1;
+    public override ulong GetAlignment() => 1;
+    public override bool IsAggregate() => false;
+
+    public override string ToString() => "bool";
+    public override bool Equals(NubType? other) => other is NubBoolType;
+    public override int GetHashCode() => HashCode.Combine(typeof(NubBoolType));
+}
+
+public sealed class NubPointerType(NubType baseType) : NubType
+{
+    public NubType BaseType { get; } = baseType;
+
+    public override ulong GetSize() => 8;
+    public override ulong GetAlignment() => 8;
+    public override bool IsAggregate() => false;
+
+    public override string ToString() => "^" + BaseType;
+    public override bool Equals(NubType? other) => other is NubPointerType pointer && BaseType.Equals(pointer.BaseType);
+    public override int GetHashCode() => HashCode.Combine(typeof(NubPointerType), BaseType);
+}
+
+public class NubFuncType(List<NubType> parameters, NubType returnType) : NubType
+{
+    public List<NubType> Parameters { get; } = parameters;
+    public NubType ReturnType { get; } = returnType;
+
+    public override ulong GetSize() => 8;
+    public override ulong GetAlignment() => 8;
+    public override bool IsAggregate() => false;
+
+    public override string ToString() => $"func({string.Join(", ", Parameters)}): {ReturnType}";
+    public override bool Equals(NubType? other) => other is NubFuncType func && ReturnType.Equals(func.ReturnType) && Parameters.SequenceEqual(func.Parameters);
+
+    public override int GetHashCode()
+    {
+        var hash = new HashCode();
+        hash.Add(typeof(NubFuncType));
+        hash.Add(ReturnType);
+        foreach (var param in Parameters)
+        {
+            hash.Add(param);
+        }
+
+        return hash.ToHashCode();
+    }
+}
+
+public class NubStructType(string module, string name, bool packed, List<NubStructFieldType> fields) : NubType
+{
+    public string Module { get; } = module;
+    public string Name { get; } = name;
+    public bool Packed { get; } = packed;
+    public List<NubStructFieldType> Fields { get; set; } = fields;
+
+    public int GetFieldIndex(string name)
+    {
+        return Fields.FindIndex(x => x.Name == name);
+    }
+
+    public Dictionary<string, ulong> GetFieldOffsets()
+    {
+        var offsets = new Dictionary<string, ulong>();
+        ulong offset = 0;
+
+        foreach (var field in Fields)
+        {
+            var alignment = Packed ? 1 : field.Type.GetAlignment();
+            if (!Packed)
+            {
+                var padding = (alignment - offset % alignment) % alignment;
+                offset += padding;
+            }
+
+            offsets[field.Name] = offset;
+            offset += field.Type.GetSize();
+        }
+
+        return offsets;
+    }
+
+    public override ulong GetSize()
+    {
+        var offsets = GetFieldOffsets();
+        if (Fields.Count == 0)
+        {
+            return 0;
+        }
+
+        var lastField = Fields.Last();
+        var size = offsets[lastField.Name] + lastField.Type.GetSize();
+
+        if (!Packed)
+        {
+            var structAlignment = GetAlignment();
+            var padding = (structAlignment - size % structAlignment) % structAlignment;
+            size += padding;
+        }
+
+        return size;
+    }
+
+    public override ulong GetAlignment()
+    {
+        if (Fields.Count == 0)
+            return 1;
+
+        return Packed ? 1 : Fields.Max(f => f.Type.GetAlignment());
+    }
+
+    public override bool IsAggregate() => true;
+
+    public override string ToString() => $"{Module}::{Name}";
+    public override bool Equals(NubType? other) => other is NubStructType structType && Name == structType.Name && Module == structType.Module;
+    public override int GetHashCode() => HashCode.Combine(typeof(NubStructType), Module, Name);
+}
+
+public class NubStructFieldType(string name, NubType type, bool hasDefaultValue)
+{
+    public string Name { get; } = name;
+    public NubType Type { get; } = type;
+    public bool HasDefaultValue { get; } = hasDefaultValue;
+}
+
+public class NubSliceType(NubType elementType) : NubType
+{
+    public NubType ElementType { get; } = elementType;
+
+    public override ulong GetSize() => 16; // note(nub31): Fat pointer
+    public override ulong GetAlignment() => 8;
+    public override bool IsAggregate() => true;
+
+    public override string ToString() => "[]" + ElementType;
+    public override bool Equals(NubType? other) => other is NubSliceType slice && ElementType.Equals(slice.ElementType);
+    public override int GetHashCode() => HashCode.Combine(typeof(NubSliceType), ElementType);
+}
+
+public class NubConstArrayType(NubType elementType, ulong size) : NubType
+{
+    public NubType ElementType { get; } = elementType;
+    public ulong Size { get; } = size;
+
+    public override ulong GetSize() => ElementType.GetSize() * Size;
+    public override ulong GetAlignment() => ElementType.GetAlignment();
+    public override bool IsAggregate() => true;
+
+    public override string ToString() => $"[{Size}]{ElementType}";
+    public override bool Equals(NubType? other) => other is NubConstArrayType array && ElementType.Equals(array.ElementType) && Size == array.Size;
+    public override int GetHashCode() => HashCode.Combine(typeof(NubConstArrayType), ElementType, Size);
+}
+
+public class NubArrayType(NubType elementType) : NubType
+{
+    public NubType ElementType { get; } = elementType;
+
+    public override ulong GetSize() => 8;
+    public override ulong GetAlignment() => 8;
+    public override bool IsAggregate() => false; // note(nub31): Just a pointer
+
+    public override string ToString() => $"[?]{ElementType}";
+    public override bool Equals(NubType? other) => other is NubArrayType array && ElementType.Equals(array.ElementType);
+    public override int GetHashCode() => HashCode.Combine(typeof(NubArrayType), ElementType);
+}
+
+public class NubStringType : NubType
+{
+    public override ulong GetSize() => 16; // note(nub31): Fat pointer
+    public override ulong GetAlignment() => 8;
+    public override bool IsAggregate() => true;
+
+    public override string ToString() => "string";
+    public override bool Equals(NubType? other) => other is NubStringType;
+    public override int GetHashCode() => HashCode.Combine(typeof(NubStringType));
+}
+
+public static class NameMangler
+{
+    public static string Mangle(params IEnumerable<NubType> types)
+    {
+        var readable = string.Join(":", types.Select(EncodeType));
+        return ComputeShortHash(readable);
+    }
+
+    private static string EncodeType(NubType node) => node switch
+    {
+        NubVoidType => "V",
+        NubBoolType => "B",
+        NubIntType i => (i.Signed ? "I" : "U") + i.Width,
+        NubFloatType f => "F" + f.Width,
+        NubStringType => "S",
+        NubArrayType a => $"A({EncodeType(a.ElementType)})",
+        NubConstArrayType ca => $"CA({EncodeType(ca.ElementType)})",
+        NubSliceType a => $"SL{EncodeType(a.ElementType)}()",
+        NubPointerType p => $"P({EncodeType(p.BaseType)})",
+        NubFuncType fn => $"FN({string.Join(":", fn.Parameters.Select(EncodeType))}:{EncodeType(fn.ReturnType)})",
+        NubStructType st => $"ST({st.Module}:{st.Name})",
+        _ => throw new NotSupportedException($"Cannot encode type: {node}")
+    };
+
+    private static string ComputeShortHash(string input)
+    {
+        var bytes = Encoding.UTF8.GetBytes(input);
+        var hash = SHA256.HashData(bytes);
+        return Convert.ToHexString(hash[..8]).ToLower();
+    }
+}

compiler/NubLang/Ast/TypeResolver.cs

@@ -0,0 +1,96 @@
+using NubLang.Diagnostics;
+using NubLang.Syntax;
+
+namespace NubLang.Ast;
+
+public class TypeResolver
+{
+    private readonly Dictionary<string, Module> _modules;
+    private readonly Dictionary<(string Module, string Name), NubType> _typeCache = new();
+    private readonly HashSet<(string Module, string Name)> _resolvingTypes = [];
+
+    public TypeResolver(Dictionary<string, Module> modules)
+    {
+        _modules = modules;
+    }
+
+    public NubType ResolveType(TypeSyntax type, string currentModule)
+    {
+        return type switch
+        {
+            ArrayTypeSyntax arr => new NubArrayType(ResolveType(arr.BaseType, currentModule)),
+            BoolTypeSyntax => new NubBoolType(),
+            IntTypeSyntax i => new NubIntType(i.Signed, i.Width),
+            FloatTypeSyntax f => new NubFloatType(f.Width),
+            FuncTypeSyntax func => new NubFuncType(func.Parameters.Select(x => ResolveType(x, currentModule)).ToList(), ResolveType(func.ReturnType, currentModule)),
+            SliceTypeSyntax slice => new NubSliceType(ResolveType(slice.BaseType, currentModule)),
+            ConstArrayTypeSyntax arr => new NubConstArrayType(ResolveType(arr.BaseType, currentModule), arr.Size),
+            PointerTypeSyntax ptr => new NubPointerType(ResolveType(ptr.BaseType, currentModule)),
+            StringTypeSyntax => new NubStringType(),
+            CustomTypeSyntax c => ResolveCustomType(c, currentModule),
+            VoidTypeSyntax => new NubVoidType(),
+            _ => throw new NotSupportedException($"Unknown type syntax: {type}")
+        };
+    }
+
+    private NubType ResolveCustomType(CustomTypeSyntax customType, string currentModule)
+    {
+        var module = _modules[customType.ModuleToken?.Value ?? currentModule];
+
+        var enumDef = module.Enums(true).FirstOrDefault(x => x.NameToken.Value == customType.NameToken.Value);
+        if (enumDef != null)
+        {
+            return enumDef.Type != null ? ResolveType(enumDef.Type, currentModule) : new NubIntType(false, 64);
+        }
+
+        var structDef = module.Structs(true).FirstOrDefault(x => x.NameToken.Value == customType.NameToken.Value);
+        if (structDef != null)
+        {
+            var key = (customType.ModuleToken?.Value ?? currentModule, customType.NameToken.Value);
+
+            if (_typeCache.TryGetValue(key, out var cachedType))
+            {
+                return cachedType;
+            }
+
+            if (!_resolvingTypes.Add(key))
+            {
+                var placeholder = new NubStructType(customType.ModuleToken?.Value ?? currentModule, customType.NameToken.Value, structDef.Packed, []);
+                _typeCache[key] = placeholder;
+                return placeholder;
+            }
+
+            try
+            {
+                var result = new NubStructType(customType.ModuleToken?.Value ?? currentModule, structDef.NameToken.Value, structDef.Packed, []);
+                _typeCache[key] = result;
+
+                var fields = structDef.Fields
+                    .Select(x => new NubStructFieldType(x.NameToken.Value, ResolveType(x.Type, currentModule), x.Value != null))
+                    .ToList();
+
+                result.Fields.AddRange(fields);
+                return result;
+            }
+            finally
+            {
+                _resolvingTypes.Remove(key);
+            }
+        }
+
+        throw new TypeResolverException(Diagnostic
+            .Error($"Type {customType.NameToken.Value} not found in module {customType.ModuleToken?.Value ?? currentModule}")
+            .At(customType)
+            .Build());
+    }
+}
+
+public class TypeResolverException : Exception
+{
+    public Diagnostic Diagnostic { get; }
+
+    public TypeResolverException(Diagnostic diagnostic) : base(diagnostic.Message)
+    {
+        Diagnostic = diagnostic;
+    }
+}

compiler/NubLang/Diagnostics/CompileException.cs

@@ -0,0 +1,11 @@
+namespace NubLang.Diagnostics;
+
+public class CompileException : Exception
+{
+    public Diagnostic Diagnostic { get; }
+
+    public CompileException(Diagnostic diagnostic) : base(diagnostic.Message)
+    {
+        Diagnostic = diagnostic;
+    }
+}

compiler/NubLang/Diagnostics/Diagnostic.cs

@@ -0,0 +1,398 @@
+using System.Text;
+using NubLang.Syntax;
+
+namespace NubLang.Diagnostics;
+
+public class Diagnostic
+{
+    public class DiagnosticBuilder
+    {
+        private readonly DiagnosticSeverity _severity;
+        private readonly string _message;
+        private SourceSpan? _span;
+        private string? _help;
+
+        public DiagnosticBuilder(DiagnosticSeverity severity, string message)
+        {
+            _severity = severity;
+            _message = message;
+        }
+
+        public DiagnosticBuilder At(SyntaxNode? node)
+        {
+            if (node != null)
+            {
+                _span = SourceSpan.Merge(node.Tokens.Select(x => x.Span));
+            }
+
+            return this;
+        }
+
+        public DiagnosticBuilder At(Token? token)
+        {
+            if (token != null)
+            {
+                At(token.Span);
+            }
+
+            return this;
+        }
+
+        public DiagnosticBuilder At(SourceSpan? span)
+        {
+            if (span != null)
+            {
+                _span = span;
+            }
+
+            return this;
+        }
+
+        public DiagnosticBuilder At(string filePath, int line, int column)
+        {
+            _span = new SourceSpan(filePath, new SourceLocation(line, column), new SourceLocation(line, column));
+            return this;
+        }
+
+        public DiagnosticBuilder WithHelp(string help)
+        {
+            _help = help;
+            return this;
+        }
+
+        public Diagnostic Build() => new(_severity, _message, _help, _span);
+    }
+
+    public static DiagnosticBuilder Error(string message) => new(DiagnosticSeverity.Error, message);
+    public static DiagnosticBuilder Warning(string message) => new(DiagnosticSeverity.Warning, message);
+    public static DiagnosticBuilder Info(string message) => new(DiagnosticSeverity.Info, message);
+
+    public DiagnosticSeverity Severity { get; }
+    public string Message { get; }
+    public string? Help { get; }
+    public SourceSpan? Span { get; }
+
+    private Diagnostic(DiagnosticSeverity severity, string message, string? help, SourceSpan? span)
+    {
+        Severity = severity;
+        Message = message;
+        Help = help;
+        Span = span;
+    }
+
+    public string FormatANSI()
+    {
+        var sb = new StringBuilder();
+
+        sb.Append(Severity switch
+        {
+            DiagnosticSeverity.Error => ConsoleColors.Colorize("error", ConsoleColors.Bold + ConsoleColors.Red),
+            DiagnosticSeverity.Warning => ConsoleColors.Colorize("warning", ConsoleColors.Bold + ConsoleColors.Yellow),
+            DiagnosticSeverity.Info => ConsoleColors.Colorize("info", ConsoleColors.Bold + ConsoleColors.Blue),
+            _ => ConsoleColors.Colorize("unknown", ConsoleColors.Bold + ConsoleColors.White)
+        });
+
+        if (Span.HasValue)
+        {
+            sb.Append(ConsoleColors.Colorize($" at {Span.Value}", ConsoleColors.Faint));
+        }
+
+        sb.Append(": ");
+        sb.Append(ConsoleColors.Colorize(Message, ConsoleColors.BrightWhite));
+
+        if (Span.HasValue)
+        {
+            sb.AppendLine();
+            var text = File.ReadAllText(Span.Value.FilePath);
+
+            var tokenizer = new Tokenizer(Span.Value.FilePath, text);
+            tokenizer.Tokenize();
+
+            var lines = text.Split('\n');
+
+            var startLine = Span.Value.Start.Line;
+            var endLine = Span.Value.End.Line;
+
+            const int CONTEXT_LINES = 3;
+
+            var contextStartLine = Math.Max(1, startLine - CONTEXT_LINES);
+            var contextEndLine = Math.Min(lines.Length, endLine + CONTEXT_LINES);
+
+            var numberPadding = contextEndLine.ToString().Length;
+
+            var codePadding = 0;
+            for (var i = contextStartLine - 1; i < contextEndLine && i < lines.Length; i++)
+            {
+                var lineLength = lines[i].Length;
+                if (lineLength > codePadding)
+                {
+                    codePadding = lineLength;
+                }
+            }
+
+            sb.Append('╭');
+            sb.Append(new string('─', numberPadding + 2));
+            sb.Append('┬');
+            sb.Append(new string('─', codePadding + 2));
+            sb.Append('╮');
+            sb.AppendLine();
+
+            for (var i = contextStartLine; i <= contextEndLine; i++)
+            {
+                var line = lines[i - 1];
+
+                sb.Append("│ ");
+                sb.Append(i.ToString().PadRight(numberPadding));
+                sb.Append(" │ ");
+                sb.Append(ApplySyntaxHighlighting(line.PadRight(codePadding), i, tokenizer.Tokens));
+                // sb.Append(line.PadRight(codePadding));
+                sb.Append(" │");
+                sb.AppendLine();
+
+                if (i >= startLine && i <= endLine)
+                {
+                    var markerStartColumn = 1;
+                    var markerEndColumn = line.Length;
+
+                    if (i == startLine)
+                    {
+                        markerStartColumn = Span.Value.Start.Column;
+                    }
+
+                    if (i == endLine)
+                    {
+                        markerEndColumn = Span.Value.End.Column;
+                    }
+
+                    var markerLength = markerEndColumn - markerStartColumn;
+                    var marker = new string('^', markerLength);
+
+                    var markerColor = Severity switch
+                    {
+                        DiagnosticSeverity.Info => ConsoleColors.Blue,
+                        DiagnosticSeverity.Warning => ConsoleColors.Yellow,
+                        DiagnosticSeverity.Error => ConsoleColors.Red,
+                        _ => ConsoleColors.White
+                    };
+
+                    sb.Append("│ ");
+                    sb.Append(new string(' ', numberPadding));
+                    sb.Append(" │ ");
+                    sb.Append(new string(' ', markerStartColumn - 1));
+                    sb.Append(ConsoleColors.Colorize(marker, markerColor));
+                    sb.Append(new string(' ', codePadding - (markerStartColumn - 1) - markerLength));
+                    sb.Append(" │");
+                    sb.AppendLine();
+                }
+            }
+
+            sb.Append('╰');
+            sb.Append(new string('─', numberPadding + 2));
+            sb.Append('┴');
+            sb.Append(new string('─', codePadding + 2));
+            sb.Append('╯');
+        }
+
+        if (Help != null)
+        {
+            sb.AppendLine();
+            sb.Append(ConsoleColors.Colorize($"help: {Help}", ConsoleColors.Cyan));
+        }
+
+        return sb.ToString();
+    }
+
+    private static string ApplySyntaxHighlighting(string line, int lineNumber, List<Token> tokens)
+    {
+        var sb = new StringBuilder();
+        var lineTokens = tokens
+            .Where(t => t.Span.Start.Line == lineNumber)
+            .OrderBy(t => t.Span.Start.Column)
+            .ToList();
+
+        if (lineTokens.Count == 0)
+        {
+            return line;
+        }
+
+        var currentColumn = 1;
+
+        foreach (var token in lineTokens)
+        {
+            var tokenStart = token.Span.Start.Column;
+            var tokenEnd = token.Span.End.Column;
+
+            if (tokenStart > currentColumn && currentColumn - 1 < line.Length)
+            {
+                var beforeLength = Math.Min(tokenStart - currentColumn, line.Length - (currentColumn - 1));
+                if (beforeLength > 0)
+                {
+                    var beforeToken = line.Substring(currentColumn - 1, beforeLength);
+                    sb.Append(beforeToken);
+                }
+            }
+
+            var tokenLength = tokenEnd - tokenStart;
+            if (tokenStart >= 1 && tokenStart - 1 < line.Length && tokenLength > 0)
+            {
+                var availableLength = line.Length - (tokenStart - 1);
+                var actualLength = Math.Min(tokenLength, availableLength);
+
+                if (actualLength > 0)
+                {
+                    var tokenText = line.Substring(tokenStart - 1, actualLength);
+                    var coloredToken = ColorizeToken(token, tokenText);
+                    sb.Append(coloredToken);
+                }
+            }
+
+            currentColumn = tokenEnd;
+        }
+
+        if (currentColumn - 1 < line.Length)
+        {
+            var remaining = line[(currentColumn - 1)..];
+            sb.Append(remaining);
+        }
+
+        return sb.ToString();
+    }
+
+    private static string ColorizeToken(Token token, string tokenText)
+    {
+        switch (token)
+        {
+            case IdentifierToken:
+            {
+                return ConsoleColors.Colorize(tokenText, ConsoleColors.BrightWhite);
+            }
+            case StringLiteralToken:
+            {
+                return ConsoleColors.Colorize(tokenText, ConsoleColors.Green);
+            }
+            case IntLiteralToken:
+            case FloatLiteralToken:
+            case BoolLiteralToken:
+            {
+                return ConsoleColors.Colorize(tokenText, ConsoleColors.Magenta);
+            }
+            case SymbolToken symbolToken:
+            {
+                switch (symbolToken.Symbol)
+                {
+                    case Symbol.Func:
+                    case Symbol.Return:
+                    case Symbol.If:
+                    case Symbol.Else:
+                    case Symbol.While:
+                    case Symbol.Break:
+                    case Symbol.Continue:
+                    case Symbol.Struct:
+                    case Symbol.Let:
+                    case Symbol.Extern:
+                    case Symbol.For:
+                    case Symbol.In:
+                    {
+                        return ConsoleColors.Colorize(tokenText, ConsoleColors.Bold + ConsoleColors.Blue);
+                    }
+                    case Symbol.Assign:
+                    case Symbol.Bang:
+                    case Symbol.Equal:
+                    case Symbol.NotEqual:
+                    case Symbol.LessThan:
+                    case Symbol.LessThanOrEqual:
+                    case Symbol.GreaterThan:
+                    case Symbol.GreaterThanOrEqual:
+                    case Symbol.Plus:
+                    case Symbol.Minus:
+                    case Symbol.Star:
+                    case Symbol.ForwardSlash:
+                    case Symbol.Caret:
+                    case Symbol.Ampersand:
+                    {
+                        return ConsoleColors.Colorize(tokenText, ConsoleColors.Yellow);
+                    }
+                    case Symbol.Colon:
+                    case Symbol.OpenParen:
+                    case Symbol.CloseParen:
+                    case Symbol.OpenBrace:
+                    case Symbol.CloseBrace:
+                    case Symbol.OpenBracket:
+                    case Symbol.CloseBracket:
+                    case Symbol.Comma:
+                    case Symbol.Period:
+                    case Symbol.Semi:
+                    {
+                        return ConsoleColors.Colorize(tokenText, ConsoleColors.BrightBlack);
+                    }
+                }
+
+                break;
+            }
+        }
+
+        return tokenText;
+    }
+}
+
+public enum DiagnosticSeverity
+{
+    Info,
+    Warning,
+    Error
+}
+
+public static class ConsoleColors
+{
+    public const string Reset = "\e[0m";
+    public const string Bold = "\e[1m";
+    public const string Faint = "\e[2m";
+    public const string Italic = "\e[3m";
+    public const string Underline = "\e[4m";
+    public const string SlowBlink = "\e[5m";
+    public const string RapidBlink = "\e[6m";
+    public const string SwapBgAndFg = "\e[7m";
+    public const string Conceal = "\e[8m";
+    public const string CrossedOut = "\e[9m";
+
+    public const string DefaultFont = "\e[10m";
+    public const string AltFont1 = "\e[11m";
+    public const string AltFont2 = "\e[12m";
+    public const string AltFont3 = "\e[13m";
+    public const string AltFont4 = "\e[14m";
+    public const string AltFont5 = "\e[15m";
+    public const string AltFont6 = "\e[16m";
+    public const string AltFont7 = "\e[17m";
+    public const string AltFont8 = "\e[18m";
+    public const string AltFont9 = "\e[19m";
+
+    public const string Black = "\e[30m";
+    public const string Red = "\e[31m";
+    public const string Green = "\e[32m";
+    public const string Yellow = "\e[33m";
+    public const string Blue = "\e[34m";
+    public const string Magenta = "\e[35m";
+    public const string Cyan = "\e[36m";
+    public const string White = "\e[37m";
+
+    public const string BrightBlack = "\e[90m";
+    public const string BrightRed = "\e[91m";
+    public const string BrightGreen = "\e[92m";
+    public const string BrightYellow = "\e[93m";
+    public const string BrightBlue = "\e[94m";
+    public const string BrightMagenta = "\e[95m";
+    public const string BrightCyan = "\e[96m";
+    public const string BrightWhite = "\e[97m";
+
+    private static bool IsColorSupported()
+    {
+        var term = Environment.GetEnvironmentVariable("TERM");
+        var colorTerm = Environment.GetEnvironmentVariable("COLORTERM");
+        return !string.IsNullOrEmpty(term) || !string.IsNullOrEmpty(colorTerm) || !Console.IsOutputRedirected;
+    }
+
+    public static string Colorize(string text, string color)
+    {
+        return IsColorSupported() ? $"{color}{text}{Reset}" : text;
+    }
+}

compiler/NubLang/Diagnostics/SourceSpan.cs

@@ -0,0 +1,112 @@
+namespace NubLang.Diagnostics;
+
+public readonly struct SourceSpan : IEquatable<SourceSpan>, IComparable<SourceSpan>
+{
+    public static SourceSpan Merge(params IEnumerable<SourceSpan> spans)
+    {
+        var spanArray = spans as SourceSpan[] ?? spans.ToArray();
+        if (spanArray.Length == 0)
+        {
+            return new SourceSpan(string.Empty, new SourceLocation(0, 0), new SourceLocation(0, 0));
+        }
+
+        var minStart = spanArray.Min(s => s.Start);
+        var maxEnd = spanArray.Max(s => s.End);
+
+        return new SourceSpan(spanArray[0].FilePath, minStart, maxEnd);
+    }
+
+    public SourceSpan(string filePath, SourceLocation start, SourceLocation end)
+    {
+        if (start > end)
+        {
+            throw new ArgumentException("Start location cannot be after end location");
+        }
+
+        FilePath = filePath;
+        Start = start;
+        End = end;
+    }
+
+    public string FilePath { get; }
+    public SourceLocation Start { get; }
+    public SourceLocation End { get; }
+
+    public override string ToString()
+    {
+        if (Start == End)
+        {
+            return $"{FilePath}:{Start}";
+        }
+
+        if (Start.Line == End.Line)
+        {
+            return Start.Column == End.Column ? $"{FilePath}:{Start}" : $"{FilePath}:{Start.Line}:{Start.Column}-{End.Column}";
+        }
+
+        return $"{FilePath}:{Start}-{End}";
+    }
+
+    public bool Equals(SourceSpan other) => Start == other.Start && End == other.End;
+    public override bool Equals(object? obj) => obj is SourceSpan other && Equals(other);
+    public override int GetHashCode() => HashCode.Combine(typeof(SourceSpan), Start, End);
+
+    public static bool operator ==(SourceSpan left, SourceSpan right) => Equals(left, right);
+    public static bool operator !=(SourceSpan left, SourceSpan right) => !Equals(left, right);
+
+    public static bool operator <(SourceSpan left, SourceSpan right) => left.CompareTo(right) < 0;
+    public static bool operator <=(SourceSpan left, SourceSpan right) => left.CompareTo(right) <= 0;
+    public static bool operator >(SourceSpan left, SourceSpan right) => left.CompareTo(right) > 0;
+    public static bool operator >=(SourceSpan left, SourceSpan right) => left.CompareTo(right) >= 0;
+
+    public int CompareTo(SourceSpan other)
+    {
+        var startComparison = Start.CompareTo(other.Start);
+        return startComparison != 0 ? startComparison : End.CompareTo(other.End);
+    }
+}
+
+public readonly struct SourceLocation : IEquatable<SourceLocation>, IComparable<SourceLocation>
+{
+    public SourceLocation(int line, int column)
+    {
+        Line = line;
+        Column = column;
+    }
+
+    public int Line { get; }
+    public int Column { get; }
+
+    public override string ToString()
+    {
+        return $"{Line}:{Column}";
+    }
+
+    public override bool Equals(object? obj)
+    {
+        return obj is SourceLocation other && Equals(other);
+    }
+
+    public bool Equals(SourceLocation other)
+    {
+        return Line == other.Line && Column == other.Column;
+    }
+
+    public override int GetHashCode()
+    {
+        return HashCode.Combine(typeof(SourceLocation), Line, Column);
+    }
+
+    public static bool operator ==(SourceLocation left, SourceLocation right) => Equals(left, right);
+    public static bool operator !=(SourceLocation left, SourceLocation right) => !Equals(left, right);
+    public static bool operator <(SourceLocation left, SourceLocation right) => left.Line < right.Line || (left.Line == right.Line && left.Column < right.Column);
+    public static bool operator >(SourceLocation left, SourceLocation right) => left.Line > right.Line || (left.Line == right.Line && left.Column > right.Column);
+    public static bool operator <=(SourceLocation left, SourceLocation right) => left.Line <= right.Line || (left.Line == right.Line && left.Column <= right.Column);
+    public static bool operator >=(SourceLocation left, SourceLocation right) => left.Line >= right.Line || (left.Line == right.Line && left.Column >= right.Column);
+
+    public int CompareTo(SourceLocation other)
+    {
+        var lineComparison = Line.CompareTo(other.Line);
+        return lineComparison != 0 ? lineComparison : Column.CompareTo(other.Column);
+    }
+}

compiler/NubLang/Generation/IndentedTextWriter.cs

@@ -0,0 +1,70 @@
+using System.Text;
+
+namespace NubLang.Generation;
+
+internal class IndentedTextWriter
+{
+    private readonly StringBuilder _builder = new();
+    private int _indentLevel;
+
+    public IDisposable Indent()
+    {
+        _indentLevel++;
+        return new IndentScope(this);
+    }
+
+    public void WriteLine(string text)
+    {
+        WriteIndent();
+        _builder.AppendLine(text);
+    }
+
+    public void Write(string text)
+    {
+        WriteIndent();
+        _builder.Append(text);
+    }
+
+    public void WriteLine()
+    {
+        _builder.AppendLine();
+    }
+
+    public override string ToString()
+    {
+        return _builder.ToString();
+    }
+
+    private void WriteIndent()
+    {
+        if (_builder.Length > 0)
+        {
+            var lastChar = _builder[^1];
+            if (lastChar != '\n' && lastChar != '\r')
+                return;
+        }
+
+        for (var i = 0; i < _indentLevel; i++)
+        {
+            _builder.Append("    ");
+        }
+    }
+
+    private class IndentScope : IDisposable
+    {
+        private readonly IndentedTextWriter _writer;
+        private bool _disposed;
+
+        public IndentScope(IndentedTextWriter writer)
+        {
+            _writer = writer;
+        }
+
+        public void Dispose()
+        {
+            if (_disposed) return;
+            _writer._indentLevel--;
+            _disposed = true;
+        }
+    }
+}

compiler/NubLang/Generation/LlvmGenerator.cs

@@ -0,0 +1,979 @@
+using System.Text;
+using NubLang.Ast;
+
+namespace NubLang.Generation;
+
+public class LlvmGenerator
+{
+    private string _module = string.Empty;
+    private int _tmpIndex;
+    private int _labelIndex;
+    private List<(string Name, int Size, string Text)> _stringLiterals = [];
+    private Stack<(string breakLabel, string continueLabel)> _loopStack = [];
+
+    public string Emit(List<TopLevelNode> topLevelNodes)
+    {
+        _stringLiterals = [];
+        _loopStack = [];
+
+        var writer = new IndentedTextWriter();
+
+        _module = topLevelNodes.OfType<ModuleNode>().First().NameToken.Value;
+        writer.WriteLine($"; Module {_module}");
+        writer.WriteLine();
+
+        writer.WriteLine("declare void @llvm.memcpy.p0.p0.i64(ptr, ptr, i64, i1)");
+        writer.WriteLine();
+
+        foreach (var structNode in topLevelNodes.OfType<StructNode>())
+        {
+            var types = structNode.Fields.Select(x => MapType(x.Type));
+            writer.WriteLine($"%{StructName(structNode)} = type {{ {string.Join(", ", types)} }}");
+            writer.WriteLine();
+
+            _tmpIndex = 0;
+            _labelIndex = 0;
+
+            writer.WriteLine($"define void @{StructName(structNode)}.new(ptr %self) {{");
+            using (writer.Indent())
+            {
+                foreach (var field in structNode.Fields)
+                {
+                    if (field.Value != null)
+                    {
+                        var index = structNode.StructType.GetFieldIndex(field.NameToken.Value);
+                        var fieldTmp = NewTmp($"struct.field.{field.NameToken.Value}");
+                        writer.WriteLine($"{fieldTmp} = getelementptr %{StructName(structNode)}, ptr %self, i32 0, i32 {index}");
+
+                        EmitExpressionInto(writer, field.Value, fieldTmp);
+                    }
+                }
+
+                writer.WriteLine("ret void");
+            }
+
+            writer.WriteLine("}");
+            writer.WriteLine();
+        }
+
+        foreach (var funcNode in topLevelNodes.OfType<FuncNode>())
+        {
+            if (funcNode.Body != null) continue;
+            var parameters = funcNode.Prototype.Parameters.Select(x => $"{MapType(x.Type)} %{x.NameToken.Value}");
+
+            writer.WriteLine($"declare {MapType(funcNode.Prototype.ReturnType)} @{FuncName(funcNode.Prototype)}({string.Join(", ", parameters)})");
+            writer.WriteLine();
+        }
+
+        foreach (var funcNode in topLevelNodes.OfType<FuncNode>())
+        {
+            if (funcNode.Body == null) continue;
+
+            _tmpIndex = 0;
+            _labelIndex = 0;
+
+            var parameters = funcNode.Prototype.Parameters.Select(x => $"{MapType(x.Type)} %{x.NameToken.Value}");
+            writer.WriteLine($"define {MapType(funcNode.Prototype.ReturnType)} @{FuncName(funcNode.Prototype)}({string.Join(", ", parameters)}) {{");
+
+            using (writer.Indent())
+            {
+                EmitBlock(writer, funcNode.Body);
+
+                // note(nub31): Implicit return for void functions
+                if (funcNode.Prototype.ReturnType is NubVoidType)
+                {
+                    writer.WriteLine("ret void");
+                }
+            }
+
+            writer.WriteLine("}");
+            writer.WriteLine();
+        }
+
+        foreach (var stringLiteral in _stringLiterals)
+        {
+            writer.WriteLine($"{stringLiteral.Name} = private unnamed_addr constant [{stringLiteral.Size} x i8] c\"{stringLiteral.Text}\\00\", align 1");
+        }
+
+        return writer.ToString();
+    }
+
+    private void EmitStatement(IndentedTextWriter writer, StatementNode statementNode)
+    {
+        switch (statementNode)
+        {
+            case AssignmentNode assignmentNode:
+                EmitAssignment(writer, assignmentNode);
+                break;
+            case BlockNode blockNode:
+                EmitBlock(writer, blockNode);
+                break;
+            case BreakNode breakNode:
+                EmitBreak(writer, breakNode);
+                break;
+            case ContinueNode continueNode:
+                EmitContinue(writer, continueNode);
+                break;
+            case DeferNode deferNode:
+                EmitDefer(writer, deferNode);
+                break;
+            case ForConstArrayNode forConstArrayNode:
+                EmitForConstArray(writer, forConstArrayNode);
+                break;
+            case ForSliceNode forSliceNode:
+                EmitForSlice(writer, forSliceNode);
+                break;
+            case IfNode ifNode:
+                EmitIf(writer, ifNode);
+                break;
+            case ReturnNode returnNode:
+                EmitReturn(writer, returnNode);
+                break;
+            case StatementFuncCallNode statementFuncCallNode:
+                EmitStatementFuncCall(writer, statementFuncCallNode);
+                break;
+            case VariableDeclarationNode variableDeclarationNode:
+                EmitVariableDeclaration(writer, variableDeclarationNode);
+                break;
+            case WhileNode whileNode:
+                EmitWhile(writer, whileNode);
+                break;
+            default:
+            {
+                throw new NotImplementedException();
+            }
+        }
+    }
+
+    private void EmitAssignment(IndentedTextWriter writer, AssignmentNode assignmentNode)
+    {
+        var target = EmitExpression(writer, assignmentNode.Target);
+        var value = Unwrap(writer, EmitExpression(writer, assignmentNode.Value));
+        writer.WriteLine($"store {MapType(assignmentNode.Value.Type)} {value}, ptr {target.Ident}");
+    }
+
+    private void EmitBlock(IndentedTextWriter writer, BlockNode blockNode)
+    {
+        foreach (var statementNode in blockNode.Statements)
+        {
+            EmitStatement(writer, statementNode);
+        }
+    }
+
+    private void EmitBreak(IndentedTextWriter writer, BreakNode breakNode)
+    {
+        var (breakLabel, _) = _loopStack.Peek();
+        writer.WriteLine($"br label %{breakLabel}");
+    }
+
+    private void EmitContinue(IndentedTextWriter writer, ContinueNode continueNode)
+    {
+        var (_, continueLabel) = _loopStack.Peek();
+        writer.WriteLine($"br label %{continueLabel}");
+    }
+
+    private void EmitDefer(IndentedTextWriter writer, DeferNode deferNode)
+    {
+        throw new NotImplementedException();
+    }
+
+    private void EmitForConstArray(IndentedTextWriter writer, ForConstArrayNode forConstArrayNode)
+    {
+        throw new NotImplementedException();
+    }
+
+    private void EmitForSlice(IndentedTextWriter writer, ForSliceNode forSliceNode)
+    {
+        throw new NotImplementedException();
+    }
+
+    private void EmitIf(IndentedTextWriter writer, IfNode ifNode)
+    {
+        var endLabel = NewLabel("if.end");
+        EmitIf(writer, ifNode, endLabel);
+        writer.WriteLine($"{endLabel}:");
+    }
+
+    private void EmitIf(IndentedTextWriter writer, IfNode ifNode, string endLabel)
+    {
+        var condition = Unwrap(writer, EmitExpression(writer, ifNode.Condition));
+        var thenLabel = NewLabel("if.then");
+        var elseLabel = ifNode.Else.HasValue ? NewLabel("if.else") : endLabel;
+
+        writer.WriteLine($"br i1 {condition}, label %{thenLabel}, label %{elseLabel}");
+
+        writer.WriteLine($"{thenLabel}:");
+        using (writer.Indent())
+        {
+            EmitBlock(writer, ifNode.Body);
+            writer.WriteLine($"br label %{endLabel}");
+        }
+
+        if (!ifNode.Else.HasValue) return;
+
+        writer.WriteLine($"{elseLabel}:");
+        using (writer.Indent())
+        {
+            ifNode.Else.Value.Match(
+                nestedElseIf => EmitIf(writer, nestedElseIf, endLabel),
+                finalElse =>
+                {
+                    EmitBlock(writer, finalElse);
+                    writer.WriteLine($"br label %{endLabel}");
+                }
+            );
+        }
+    }
+
+    private void EmitReturn(IndentedTextWriter writer, ReturnNode returnNode)
+    {
+        if (returnNode.Value != null)
+        {
+            var returnValue = Unwrap(writer, EmitExpression(writer, returnNode.Value));
+            writer.WriteLine($"ret {MapType(returnNode.Value.Type)} {returnValue}");
+        }
+        else
+        {
+            writer.WriteLine("ret void");
+        }
+    }
+
+    private void EmitStatementFuncCall(IndentedTextWriter writer, StatementFuncCallNode statementFuncCallNode)
+    {
+        EmitFuncCall(writer, statementFuncCallNode.FuncCall);
+    }
+
+    private void EmitVariableDeclaration(IndentedTextWriter writer, VariableDeclarationNode variableDeclarationNode)
+    {
+        writer.WriteLine($"%{variableDeclarationNode.NameToken.Value} = alloca {MapType(variableDeclarationNode.Type)}");
+        if (variableDeclarationNode.Assignment != null)
+        {
+            EmitExpressionInto(writer, variableDeclarationNode.Assignment, $"%{variableDeclarationNode.NameToken.Value}");
+        }
+    }
+
+    private void EmitWhile(IndentedTextWriter writer, WhileNode whileNode)
+    {
+        var conditionLabel = NewLabel("while.condition");
+        var bodyLabel = NewLabel("while.body");
+        var endLabel = NewLabel("while.end");
+
+        _loopStack.Push((endLabel, conditionLabel));
+
+        writer.WriteLine($"br label %{conditionLabel}");
+
+        writer.WriteLine($"{conditionLabel}:");
+        using (writer.Indent())
+        {
+            var condition = Unwrap(writer, EmitExpression(writer, whileNode.Condition));
+            writer.WriteLine($"br i1 {condition}, label %{bodyLabel}, label %{endLabel}");
+        }
+
+        writer.WriteLine($"{bodyLabel}:");
+        using (writer.Indent())
+        {
+            EmitBlock(writer, whileNode.Body);
+            writer.WriteLine($"br label %{conditionLabel}");
+        }
+
+        _loopStack.Pop();
+
+        writer.WriteLine($"{endLabel}:");
+    }
+
+    private Tmp EmitExpression(IndentedTextWriter writer, ExpressionNode expressionNode)
+    {
+        return expressionNode switch
+        {
+            RValue rValue => EmitRValue(writer, rValue),
+            LValue lValue => EmitLValue(writer, lValue),
+            _ => throw new ArgumentOutOfRangeException(nameof(expressionNode))
+        };
+    }
+
+    private void EmitExpressionInto(IndentedTextWriter writer, ExpressionNode expressionNode, string destination)
+    {
+        switch (expressionNode)
+        {
+            case StructInitializerNode structInitializerNode:
+            {
+                EmitStructInitializer(writer, structInitializerNode, destination);
+                return;
+            }
+            case ConstArrayInitializerNode constArrayInitializerNode:
+            {
+                EmitConstArrayInitializer(writer, constArrayInitializerNode, destination);
+                return;
+            }
+        }
+
+        var value = Unwrap(writer, EmitExpression(writer, expressionNode));
+
+        if (expressionNode.Type.IsAggregate())
+        {
+            // note(nub31): Fall back to slow method creating a copy
+            writer.WriteLine("; Slow rvalue copy instead of direct memory write");
+            writer.WriteLine($"call void @llvm.memcpy.p0.p0.i64(ptr {destination}, ptr {value}, i64 {expressionNode.Type.GetSize()}, i1 false)");
+        }
+        else
+        {
+            writer.WriteLine($"store {MapType(expressionNode.Type)} {value}, ptr {destination}");
+        }
+    }
+
+    private Tmp EmitRValue(IndentedTextWriter writer, RValue rValue)
+    {
+        return rValue switch
+        {
+            AddressOfNode addressOfNode => EmitAddressOf(writer, addressOfNode),
+            BinaryExpressionNode binaryExpressionNode => EmitBinaryExpression(writer, binaryExpressionNode),
+            BoolLiteralNode boolLiteralNode => EmitBoolLiteral(writer, boolLiteralNode),
+            CastNode castNode => EmitCast(writer, castNode),
+            ConstArrayInitializerNode constArrayInitializerNode => EmitConstArrayInitializer(writer, constArrayInitializerNode),
+            CStringLiteralNode cStringLiteralNode => EmitCStringLiteral(writer, cStringLiteralNode),
+            Float32LiteralNode float32LiteralNode => EmitFloat32Literal(writer, float32LiteralNode),
+            Float64LiteralNode float64LiteralNode => EmitFloat64Literal(writer, float64LiteralNode),
+            FuncCallNode funcCallNode => EmitFuncCall(writer, funcCallNode),
+            FuncIdentifierNode funcIdentifierNode => EmitFuncIdentifier(writer, funcIdentifierNode),
+            I16LiteralNode i16LiteralNode => EmitI16Literal(writer, i16LiteralNode),
+            I32LiteralNode i32LiteralNode => EmitI32Literal(writer, i32LiteralNode),
+            I64LiteralNode i64LiteralNode => EmitI64Literal(writer, i64LiteralNode),
+            I8LiteralNode i8LiteralNode => EmitI8Literal(writer, i8LiteralNode),
+            SizeNode sizeNode => EmitSize(writer, sizeNode),
+            StringLiteralNode stringLiteralNode => EmitStringLiteral(writer, stringLiteralNode),
+            StructInitializerNode structInitializerNode => EmitStructInitializer(writer, structInitializerNode),
+            U16LiteralNode u16LiteralNode => EmitU16Literal(writer, u16LiteralNode),
+            U32LiteralNode u32LiteralNode => EmitU32Literal(writer, u32LiteralNode),
+            U64LiteralNode u64LiteralNode => EmitU64Literal(writer, u64LiteralNode),
+            U8LiteralNode u8LiteralNode => EmitU8Literal(writer, u8LiteralNode),
+            UnaryExpressionNode unaryExpressionNode => EmitUnaryExpression(writer, unaryExpressionNode),
+            _ => throw new ArgumentOutOfRangeException(nameof(rValue), rValue, null)
+        };
+    }
+
+    private Tmp EmitLValue(IndentedTextWriter writer, LValue lValue)
+    {
+        return lValue switch
+        {
+            ArrayIndexAccessNode arrayIndexAccessNode => EmitArrayIndexAccess(writer, arrayIndexAccessNode),
+            ConstArrayIndexAccessNode constArrayIndexAccessNode => EmitConstArrayIndexAccess(writer, constArrayIndexAccessNode),
+            DereferenceNode dereferenceNode => EmitDereference(writer, dereferenceNode),
+            SliceIndexAccessNode sliceIndexAccessNode => EmitSliceIndexAccess(writer, sliceIndexAccessNode),
+            StructFieldAccessNode structFieldAccessNode => EmitStructFieldAccess(writer, structFieldAccessNode),
+            VariableIdentifierNode variableIdentifierNode => EmitVariableIdentifier(writer, variableIdentifierNode),
+            _ => throw new ArgumentOutOfRangeException(nameof(lValue), lValue, null)
+        };
+    }
+
+    private Tmp EmitAddressOf(IndentedTextWriter writer, AddressOfNode addressOfNode)
+    {
+        var target = EmitExpression(writer, addressOfNode.Target);
+        return new Tmp(target.Ident, addressOfNode.Type, false);
+    }
+
+    private Tmp EmitArrayIndexAccess(IndentedTextWriter writer, ArrayIndexAccessNode arrayIndexAccessNode)
+    {
+        var arrayPtr = Unwrap(writer, EmitExpression(writer, arrayIndexAccessNode.Target));
+        var index = Unwrap(writer, EmitExpression(writer, arrayIndexAccessNode.Index));
+
+        var elementType = ((NubArrayType)arrayIndexAccessNode.Target.Type).ElementType;
+        var ptrTmp = NewTmp("array.element");
+        writer.WriteLine($"{ptrTmp} = getelementptr {MapType(elementType)}, ptr {arrayPtr}, {MapType(arrayIndexAccessNode.Index.Type)} {index}");
+
+        return new Tmp(ptrTmp, arrayIndexAccessNode.Type, true);
+    }
+
+    private Tmp EmitBinaryExpression(IndentedTextWriter writer, BinaryExpressionNode binaryExpressionNode)
+    {
+        var left = Unwrap(writer, EmitExpression(writer, binaryExpressionNode.Left));
+        var right = Unwrap(writer, EmitExpression(writer, binaryExpressionNode.Right));
+        var result = NewTmp("binop");
+
+        var leftType = binaryExpressionNode.Left.Type;
+        var op = binaryExpressionNode.Operator;
+
+        switch (op)
+        {
+            case BinaryOperator.Equal:
+            case BinaryOperator.NotEqual:
+            case BinaryOperator.GreaterThan:
+            case BinaryOperator.GreaterThanOrEqual:
+            case BinaryOperator.LessThan:
+            case BinaryOperator.LessThanOrEqual:
+            {
+                var cmpOp = leftType switch
+                {
+                    NubIntType intType => GenerateIntComparison(op, intType.Signed),
+                    NubFloatType => GenerateFloatComparison(op),
+                    NubBoolType => GenerateBoolComparison(op),
+                    NubPointerType => GeneratePointerComparison(op),
+                    _ => throw new InvalidOperationException($"Unexpected type for comparison: {leftType}")
+                };
+
+                writer.WriteLine($"{result} = {cmpOp} {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            case BinaryOperator.LogicalAnd:
+            {
+                writer.WriteLine($"{result} = and i1 {left}, {right}");
+                break;
+            }
+            case BinaryOperator.LogicalOr:
+            {
+                writer.WriteLine($"{result} = or i1 {left}, {right}");
+                break;
+            }
+            case BinaryOperator.Plus:
+            {
+                var instruction = leftType switch
+                {
+                    NubIntType => "add",
+                    NubFloatType => "fadd",
+                    _ => throw new InvalidOperationException($"Unexpected type for plus: {leftType}")
+                };
+                writer.WriteLine($"{result} = {instruction} {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            case BinaryOperator.Minus:
+            {
+                var instruction = leftType switch
+                {
+                    NubIntType => "sub",
+                    NubFloatType => "fsub",
+                    _ => throw new InvalidOperationException($"Unexpected type for minus: {leftType}")
+                };
+                writer.WriteLine($"{result} = {instruction} {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            case BinaryOperator.Multiply:
+            {
+                var instruction = leftType switch
+                {
+                    NubIntType => "mul",
+                    NubFloatType => "fmul",
+                    _ => throw new InvalidOperationException($"Unexpected type for multiply: {leftType}")
+                };
+                writer.WriteLine($"{result} = {instruction} {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            case BinaryOperator.Divide:
+            {
+                var instruction = leftType switch
+                {
+                    NubIntType intType => intType.Signed ? "sdiv" : "udiv",
+                    NubFloatType => "fdiv",
+                    _ => throw new InvalidOperationException($"Unexpected type for divide: {leftType}")
+                };
+                writer.WriteLine($"{result} = {instruction} {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            case BinaryOperator.Modulo:
+            {
+                var instruction = leftType switch
+                {
+                    NubIntType intType => intType.Signed ? "srem" : "urem",
+                    NubFloatType => "frem",
+                    _ => throw new InvalidOperationException($"Unexpected type for modulo: {leftType}")
+                };
+                writer.WriteLine($"{result} = {instruction} {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            case BinaryOperator.LeftShift:
+            {
+                writer.WriteLine($"{result} = shl {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            case BinaryOperator.RightShift:
+            {
+                var intType = (NubIntType)leftType;
+                var instruction = intType.Signed ? "ashr" : "lshr";
+                writer.WriteLine($"{result} = {instruction} {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            case BinaryOperator.BitwiseAnd:
+            {
+                writer.WriteLine($"{result} = and {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            case BinaryOperator.BitwiseXor:
+            {
+                writer.WriteLine($"{result} = xor {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            case BinaryOperator.BitwiseOr:
+            {
+                writer.WriteLine($"{result} = or {MapType(leftType)} {left}, {right}");
+                break;
+            }
+            default:
+                throw new ArgumentOutOfRangeException(nameof(op), op, null);
+        }
+
+        return new Tmp(result, binaryExpressionNode.Type, false);
+    }
+
+    private string GenerateIntComparison(BinaryOperator op, bool signed)
+    {
+        return op switch
+        {
+            BinaryOperator.Equal => "icmp eq",
+            BinaryOperator.NotEqual => "icmp ne",
+            BinaryOperator.GreaterThan => signed ? "icmp sgt" : "icmp ugt",
+            BinaryOperator.GreaterThanOrEqual => signed ? "icmp sge" : "icmp uge",
+            BinaryOperator.LessThan => signed ? "icmp slt" : "icmp ult",
+            BinaryOperator.LessThanOrEqual => signed ? "icmp sle" : "icmp ule",
+            _ => throw new ArgumentOutOfRangeException(nameof(op), op, null)
+        };
+    }
+
+    private string GenerateFloatComparison(BinaryOperator op)
+    {
+        return op switch
+        {
+            BinaryOperator.Equal => "fcmp oeq",
+            BinaryOperator.NotEqual => "fcmp one",
+            BinaryOperator.GreaterThan => "fcmp ogt",
+            BinaryOperator.GreaterThanOrEqual => "fcmp oge",
+            BinaryOperator.LessThan => "fcmp olt",
+            BinaryOperator.LessThanOrEqual => "fcmp ole",
+            _ => throw new ArgumentOutOfRangeException(nameof(op), op, null)
+        };
+    }
+
+    private string GenerateBoolComparison(BinaryOperator op)
+    {
+        return op switch
+        {
+            BinaryOperator.Equal => "icmp eq",
+            BinaryOperator.NotEqual => "icmp ne",
+            _ => throw new ArgumentOutOfRangeException(nameof(op), op, null)
+        };
+    }
+
+    private string GeneratePointerComparison(BinaryOperator op)
+    {
+        return op switch
+        {
+            BinaryOperator.Equal => "icmp eq",
+            BinaryOperator.NotEqual => "icmp ne",
+            BinaryOperator.GreaterThan => "icmp ugt",
+            BinaryOperator.GreaterThanOrEqual => "icmp uge",
+            BinaryOperator.LessThan => "icmp ult",
+            BinaryOperator.LessThanOrEqual => "icmp ule",
+            _ => throw new ArgumentOutOfRangeException(nameof(op), op, null)
+        };
+    }
+
+    private Tmp EmitBoolLiteral(IndentedTextWriter writer, BoolLiteralNode boolLiteralNode)
+    {
+        return new Tmp(boolLiteralNode.Value ? "1" : "0", boolLiteralNode.Type, false);
+    }
+
+    private Tmp EmitCast(IndentedTextWriter writer, CastNode castNode)
+    {
+        var source = Unwrap(writer, EmitExpression(writer, castNode.Value));
+        var sourceType = castNode.Value.Type;
+        var targetType = castNode.Type;
+
+        var result = NewTmp("cast");
+
+        switch (sourceType, targetType)
+        {
+            case (NubIntType sourceInt, NubIntType targetInt):
+            {
+                if (sourceInt.Width < targetInt.Width)
+                {
+                    var op = sourceInt.Signed ? "sext" : "zext";
+                    writer.WriteLine($"{result} = {op} {MapType(sourceType)} {source} to {MapType(targetType)}");
+                }
+                else if (sourceInt.Width > targetInt.Width)
+                {
+                    writer.WriteLine($"{result} = trunc {MapType(sourceType)} {source} to {MapType(targetType)}");
+                }
+                else
+                {
+                    writer.WriteLine($"{result} = bitcast {MapType(sourceType)} {source} to {MapType(targetType)}");
+                }
+
+                break;
+            }
+            case (NubFloatType sourceFloat, NubFloatType targetFloat):
+            {
+                if (sourceFloat.Width < targetFloat.Width)
+                {
+                    writer.WriteLine($"{result} = fpext {MapType(sourceType)} {source} to {MapType(targetType)}");
+                }
+                else
+                {
+                    writer.WriteLine($"{result} = fptrunc {MapType(sourceType)} {source} to {MapType(targetType)}");
+                }
+
+                break;
+            }
+            case (NubIntType intType, NubFloatType):
+            {
+                var intToFloatOp = intType.Signed ? "sitofp" : "uitofp";
+                writer.WriteLine($"{result} = {intToFloatOp} {MapType(sourceType)} {source} to {MapType(targetType)}");
+                break;
+            }
+            case (NubFloatType, NubIntType targetInt):
+            {
+                var floatToIntOp = targetInt.Signed ? "fptosi" : "fptoui";
+                writer.WriteLine($"{result} = {floatToIntOp} {MapType(sourceType)} {source} to {MapType(targetType)}");
+                break;
+            }
+            case (NubPointerType, NubPointerType):
+            case (NubPointerType, NubIntType):
+            case (NubIntType, NubPointerType):
+            {
+                writer.WriteLine($"{result} = inttoptr {MapType(sourceType)} {source} to {MapType(targetType)}");
+                break;
+            }
+            default:
+            {
+                throw new NotImplementedException($"Cast from {sourceType} to {targetType} not implemented");
+            }
+        }
+
+        return new Tmp(result, castNode.Type, false);
+    }
+
+
+    private Tmp EmitConstArrayIndexAccess(IndentedTextWriter writer, ConstArrayIndexAccessNode constArrayIndexAccessNode)
+    {
+        var arrayPtr = Unwrap(writer, EmitExpression(writer, constArrayIndexAccessNode.Target));
+        var index = Unwrap(writer, EmitExpression(writer, constArrayIndexAccessNode.Index));
+
+        var elementType = ((NubConstArrayType)constArrayIndexAccessNode.Target.Type).ElementType;
+        var ptrTmp = NewTmp("array.element");
+        writer.WriteLine($"{ptrTmp} = getelementptr {MapType(elementType)}, ptr {arrayPtr}, {MapType(constArrayIndexAccessNode.Index.Type)} {index}");
+
+        return new Tmp(ptrTmp, constArrayIndexAccessNode.Type, true);
+    }
+
+    private Tmp EmitConstArrayInitializer(IndentedTextWriter writer, ConstArrayInitializerNode constArrayInitializerNode, string? destination = null)
+    {
+        var arrayType = (NubConstArrayType)constArrayInitializerNode.Type;
+
+        if (destination == null)
+        {
+            destination = NewTmp("array");
+            writer.WriteLine($"{destination} = alloca {MapType(arrayType)}");
+        }
+
+        for (var i = 0; i < constArrayInitializerNode.Values.Count; i++)
+        {
+            var value = constArrayInitializerNode.Values[i];
+            var indexTmp = NewTmp("array.element");
+            writer.WriteLine($"{indexTmp} = getelementptr {MapType(arrayType)}, ptr {destination}, i32 0, i32 {i}");
+            EmitExpressionInto(writer, value, indexTmp);
+        }
+
+        return new Tmp(destination, constArrayInitializerNode.Type, false);
+    }
+
+    private Tmp EmitCStringLiteral(IndentedTextWriter writer, CStringLiteralNode cStringLiteralNode)
+    {
+        var escaped = EscapeStringForLLVM(cStringLiteralNode.Value);
+
+        var stringWithNull = cStringLiteralNode.Value + "\0";
+        var length = stringWithNull.Length;
+
+        var globalName = $"@.str.{_stringLiterals.Count}";
+
+        _stringLiterals.Add((globalName, length, escaped));
+
+        var gepTmp = NewTmp("str.ptr");
+        writer.WriteLine($"{gepTmp} = getelementptr [{length} x i8], ptr {globalName}, i32 0, i32 0");
+
+        return new Tmp(gepTmp, cStringLiteralNode.Type, false);
+    }
+
+    private string EscapeStringForLLVM(string input)
+    {
+        var result = new StringBuilder();
+        foreach (var c in input)
+        {
+            if (c == '\0')
+                result.Append("\\00");
+            else if (c == '\n')
+                result.Append("\\0A");
+            else if (c == '\r')
+                result.Append("\\0D");
+            else if (c == '\t')
+                result.Append("\\09");
+            else if (c == '\\')
+                result.Append("\\\\");
+            else if (c == '"')
+                result.Append("\\22");
+            else if (c < 32 || c > 126)
+                result.Append($"\\{(int)c:X2}");
+            else
+                result.Append(c);
+        }
+
+        return result.ToString();
+    }
+
+    private Tmp EmitDereference(IndentedTextWriter writer, DereferenceNode dereferenceNode)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Tmp EmitFloat32Literal(IndentedTextWriter writer, Float32LiteralNode float32LiteralNode)
+    {
+        var literal = ((double)float32LiteralNode.Value).ToString("R", System.Globalization.CultureInfo.InvariantCulture);
+        if (!literal.Contains('.'))
+        {
+            literal += ".0";
+        }
+
+        return new Tmp(literal, float32LiteralNode.Type, false);
+    }
+
+    private Tmp EmitFloat64Literal(IndentedTextWriter writer, Float64LiteralNode float64LiteralNode)
+    {
+        var literal = float64LiteralNode.Value.ToString("R", System.Globalization.CultureInfo.InvariantCulture);
+        if (!literal.Contains('.'))
+        {
+            literal += ".0";
+        }
+
+        return new Tmp(literal, float64LiteralNode.Type, false);
+    }
+
+    private Tmp EmitFuncCall(IndentedTextWriter writer, FuncCallNode funcCallNode)
+    {
+        var result = NewTmp();
+
+        var parameterStrings = new List<string>();
+
+        foreach (var parameter in funcCallNode.Parameters)
+        {
+            var value = Unwrap(writer, EmitExpression(writer, parameter));
+            parameterStrings.Add($"{MapType(parameter.Type)} {value}");
+        }
+
+        var functionPtr = Unwrap(writer, EmitExpression(writer, funcCallNode.Expression));
+
+        if (funcCallNode.Type is NubVoidType)
+        {
+            writer.WriteLine($"call {MapType(funcCallNode.Type)} {functionPtr}({string.Join(", ", parameterStrings)})");
+        }
+        else
+        {
+            writer.WriteLine($"{result} = call {MapType(funcCallNode.Type)} {functionPtr}({string.Join(", ", parameterStrings)})");
+        }
+
+        return new Tmp(result, funcCallNode.Type, false);
+    }
+
+    private Tmp EmitFuncIdentifier(IndentedTextWriter writer, FuncIdentifierNode funcIdentifierNode)
+    {
+        var name = FuncName(funcIdentifierNode.ModuleToken.Value, funcIdentifierNode.NameToken.Value, funcIdentifierNode.ExternSymbolToken?.Value);
+        return new Tmp($"@{name}", funcIdentifierNode.Type, false);
+    }
+
+    private Tmp EmitI16Literal(IndentedTextWriter writer, I16LiteralNode i16LiteralNode)
+    {
+        return new Tmp(i16LiteralNode.Value.ToString(), i16LiteralNode.Type, false);
+    }
+
+    private Tmp EmitI32Literal(IndentedTextWriter writer, I32LiteralNode i32LiteralNode)
+    {
+        return new Tmp(i32LiteralNode.Value.ToString(), i32LiteralNode.Type, false);
+    }
+
+    private Tmp EmitI64Literal(IndentedTextWriter writer, I64LiteralNode i64LiteralNode)
+    {
+        return new Tmp(i64LiteralNode.Value.ToString(), i64LiteralNode.Type, false);
+    }
+
+    private Tmp EmitI8Literal(IndentedTextWriter writer, I8LiteralNode i8LiteralNode)
+    {
+        return new Tmp(i8LiteralNode.Value.ToString(), i8LiteralNode.Type, false);
+    }
+
+    private Tmp EmitSize(IndentedTextWriter writer, SizeNode sizeNode)
+    {
+        return new Tmp(sizeNode.TargetType.GetSize().ToString(), sizeNode.Type, false);
+    }
+
+    private Tmp EmitSliceIndexAccess(IndentedTextWriter writer, SliceIndexAccessNode sliceIndexAccessNode)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Tmp EmitStringLiteral(IndentedTextWriter writer, StringLiteralNode stringLiteralNode)
+    {
+        throw new NotImplementedException();
+    }
+
+    private Tmp EmitStructFieldAccess(IndentedTextWriter writer, StructFieldAccessNode structFieldAccessNode)
+    {
+        var target = Unwrap(writer, EmitExpression(writer, structFieldAccessNode.Target));
+
+        var structType = (NubStructType)structFieldAccessNode.Target.Type;
+        var index = structType.GetFieldIndex(structFieldAccessNode.FieldToken.Value);
+
+        var ptrTmp = NewTmp($"struct.field.{structFieldAccessNode.FieldToken.Value}");
+        writer.WriteLine($"{ptrTmp} = getelementptr %{StructName(structType.Module, structType.Name)}, ptr {target}, i32 0, i32 {index}");
+
+        return new Tmp(ptrTmp, structFieldAccessNode.Type, true);
+    }
+
+    private Tmp EmitStructInitializer(IndentedTextWriter writer, StructInitializerNode structInitializerNode, string? destination = null)
+    {
+        if (destination == null)
+        {
+            destination = NewTmp("struct");
+            writer.WriteLine($"{destination} = alloca {MapType(structInitializerNode.Type)}");
+        }
+
+        var structType = (NubStructType)structInitializerNode.Type;
+
+        writer.WriteLine($"call void @{StructName(structType.Module, structType.Name)}.new(ptr {destination})");
+
+        foreach (var (name, value) in structInitializerNode.Initializers)
+        {
+            var index = structType.GetFieldIndex(name.Value);
+            var fieldTmp = NewTmp($"struct.field.{name}");
+            writer.WriteLine($"{fieldTmp} = getelementptr %{StructName(structType.Module, structType.Name)}, ptr {destination}, i32 0, i32 {index}");
+
+            EmitExpressionInto(writer, value, fieldTmp);
+        }
+
+        return new Tmp(destination, structInitializerNode.Type, false);
+    }
+
+    private Tmp EmitU16Literal(IndentedTextWriter writer, U16LiteralNode u16LiteralNode)
+    {
+        return new Tmp(u16LiteralNode.Value.ToString(), u16LiteralNode.Type, false);
+    }
+
+    private Tmp EmitU32Literal(IndentedTextWriter writer, U32LiteralNode u32LiteralNode)
+    {
+        return new Tmp(u32LiteralNode.Value.ToString(), u32LiteralNode.Type, false);
+    }
+
+    private Tmp EmitU64Literal(IndentedTextWriter writer, U64LiteralNode u64LiteralNode)
+    {
+        return new Tmp(u64LiteralNode.Value.ToString(), u64LiteralNode.Type, false);
+    }
+
+    private Tmp EmitU8Literal(IndentedTextWriter writer, U8LiteralNode u8LiteralNode)
+    {
+        return new Tmp(u8LiteralNode.Value.ToString(), u8LiteralNode.Type, false);
+    }
+
+    private Tmp EmitUnaryExpression(IndentedTextWriter writer, UnaryExpressionNode unaryExpressionNode)
+    {
+        var operand = Unwrap(writer, EmitExpression(writer, unaryExpressionNode.Operand));
+        var result = NewTmp("unary");
+
+        switch (unaryExpressionNode.Operator)
+        {
+            case UnaryOperator.Negate:
+                switch (unaryExpressionNode.Operand.Type)
+                {
+                    case NubIntType intType:
+                        writer.WriteLine($"{result} = sub {MapType(intType)} 0, {operand}");
+                        break;
+                    case NubFloatType floatType:
+                        writer.WriteLine($"{result} = fneg {MapType(floatType)} {operand}");
+                        break;
+                    default:
+                        throw new ArgumentOutOfRangeException();
+                }
+
+                break;
+            case UnaryOperator.Invert:
+                writer.WriteLine($"{result} = xor i1 {operand}, true");
+                break;
+            default:
+                throw new ArgumentOutOfRangeException();
+        }
+
+        return new Tmp(result, unaryExpressionNode.Type, false);
+    }
+
+    private Tmp EmitVariableIdentifier(IndentedTextWriter writer, VariableIdentifierNode variableIdentifierNode)
+    {
+        return new Tmp($"%{variableIdentifierNode.NameToken.Value}", variableIdentifierNode.Type, true);
+    }
+
+    private string StructName(StructNode structNode)
+    {
+        return StructName(_module, structNode.NameToken.Value);
+    }
+
+    private string StructName(string module, string name)
+    {
+        return $"struct.{module}.{name}";
+    }
+
+    private string FuncName(FuncPrototypeNode funcNodePrototype)
+    {
+        return FuncName(_module, funcNodePrototype.NameToken.Value, funcNodePrototype.ExternSymbolToken?.Value);
+    }
+
+    private string FuncName(string module, string name, string? externSymbol)
+    {
+        if (externSymbol != null)
+        {
+            return externSymbol;
+        }
+
+        return $"{module}.{name}";
+    }
+
+    private string MapType(NubType type)
+    {
+        return type switch
+        {
+            NubArrayType arrayType => $"{MapType(arrayType.ElementType)}*",
+            NubBoolType => "i1",
+            NubConstArrayType constArrayType => $"[{constArrayType.Size} x {MapType(constArrayType.ElementType)}]",
+            NubFloatType floatType => floatType.Width == 32 ? "float" : "double",
+            NubFuncType funcType => MapFuncType(funcType),
+            NubIntType intType => $"i{intType.Width}",
+            NubPointerType pointerType => $"{MapType(pointerType.BaseType)}*",
+            NubSliceType sliceType => throw new NotImplementedException(),
+            NubStringType stringType => throw new NotImplementedException(),
+            NubStructType structType => $"%{StructName(structType.Module, structType.Name)}",
+            NubVoidType => "void",
+            _ => throw new ArgumentOutOfRangeException(nameof(type))
+        };
+    }
+
+    private string MapFuncType(NubFuncType funcType)
+    {
+        var paramTypes = string.Join(", ", funcType.Parameters.Select(MapType));
+        var returnType = MapType(funcType.ReturnType);
+        return $"{returnType} ({paramTypes})*";
+    }
+
+    private record Tmp(string Ident, NubType Type, bool LValue);
+
+    private string Unwrap(IndentedTextWriter writer, Tmp tmp)
+    {
+        if (tmp.LValue && !tmp.Type.IsAggregate())
+        {
+            var newTmp = NewTmp("deref");
+            writer.WriteLine($"{newTmp} = load {MapType(tmp.Type)}, ptr {tmp.Ident}");
+            return newTmp;
+        }
+
+        return tmp.Ident;
+    }
+
+    private string NewTmp(string name = "t")
+    {
+        return $"%{name}.{++_tmpIndex}";
+    }
+
+    private string NewLabel(string name = "l")
+    {
+        return $"{name}.{++_labelIndex}";
+    }
+}

compiler/NubLang/NubLang.csproj

@@ -1,10 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <OutputType>Exe</OutputType>
         <TargetFramework>net9.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
+        <IsAotCompatible>true</IsAotCompatible>
     </PropertyGroup>
 
 </Project>

compiler/NubLang/Syntax/Module.cs

@@ -0,0 +1,60 @@
+namespace NubLang.Syntax;
+
+public sealed class Module
+{
+    public static Dictionary<string, Module> Collect(List<SyntaxTree> syntaxTrees)
+    {
+        var modules = new Dictionary<string, Module>();
+        foreach (var syntaxTree in syntaxTrees)
+        {
+            var moduleDeclaration = syntaxTree.TopLevelSyntaxNodes.OfType<ModuleSyntax>().FirstOrDefault();
+            if (moduleDeclaration != null)
+            {
+                if (!modules.TryGetValue(moduleDeclaration.NameToken.Value, out var module))
+                {
+                    module = new Module();
+                    modules.Add(moduleDeclaration.NameToken.Value, module);
+                }
+
+                module._definitions.AddRange(syntaxTree.TopLevelSyntaxNodes);
+            }
+        }
+
+        return modules;
+    }
+
+    private readonly List<TopLevelSyntaxNode> _definitions = [];
+
+    public List<StructSyntax> Structs(bool includePrivate)
+    {
+        return _definitions
+            .OfType<StructSyntax>()
+            .Where(x => x.Exported || includePrivate)
+            .ToList();
+    }
+
+    public List<FuncSyntax> Functions(bool includePrivate)
+    {
+        return _definitions
+            .OfType<FuncSyntax>()
+            .Where(x => x.Exported || includePrivate)
+            .ToList();
+    }
+
+    public List<EnumSyntax> Enums(bool includePrivate)
+    {
+        return _definitions
+            .OfType<EnumSyntax>()
+            .Where(x => x.Exported || includePrivate)
+            .ToList();
+    }
+
+    public List<string> Imports()
+    {
+        return _definitions
+            .OfType<ImportSyntax>()
+            .Select(x => x.NameToken.Value)
+            .Distinct()
+            .ToList();
+    }
+}

compiler/NubLang/Syntax/Parser.cs

@@ -0,0 +1,907 @@
+using System.Diagnostics.CodeAnalysis;
+using NubLang.Diagnostics;
+
+namespace NubLang.Syntax;
+
+public sealed class Parser
+{
+    private List<Token> _tokens = [];
+    private int _tokenIndex;
+
+    private Token? CurrentToken => _tokenIndex < _tokens.Count ? _tokens[_tokenIndex] : null;
+    private bool HasToken => CurrentToken != null;
+
+    public List<Diagnostic> Diagnostics { get; } = [];
+
+    public SyntaxTree Parse(List<Token> tokens)
+    {
+        Diagnostics.Clear();
+        _tokens = tokens;
+        _tokenIndex = 0;
+
+        var topLevelSyntaxNodes = new List<TopLevelSyntaxNode>();
+
+        while (HasToken)
+        {
+            try
+            {
+                var startIndex = _tokenIndex;
+
+                var exported = TryExpectSymbol(Symbol.Export);
+                var packed = TryExpectSymbol(Symbol.Packed);
+
+                if (TryExpectSymbol(Symbol.Extern))
+                {
+                    var externSymbol = ExpectStringLiteral();
+                    ExpectSymbol(Symbol.Func);
+                    topLevelSyntaxNodes.Add(ParseFunc(startIndex, exported, externSymbol));
+                    continue;
+                }
+
+                var keyword = ExpectSymbol();
+                TopLevelSyntaxNode definition = keyword.Symbol switch
+                {
+                    Symbol.Module => ParseModule(startIndex),
+                    Symbol.Import => ParseImport(startIndex),
+                    Symbol.Func => ParseFunc(startIndex, exported, null),
+                    Symbol.Struct => ParseStruct(startIndex, exported, packed),
+                    Symbol.Enum => ParseEnum(startIndex, exported),
+                    _ => throw new CompileException(Diagnostic
+                        .Error($"Expected 'func', 'struct', 'enum', 'import' or 'module' but found '{keyword.Symbol}'")
+                        .WithHelp("Valid top level statements are 'func', 'struct', 'enum', 'import' and 'module'")
+                        .At(keyword)
+                        .Build())
+                };
+
+                topLevelSyntaxNodes.Add(definition);
+            }
+            catch (CompileException e)
+            {
+                Diagnostics.Add(e.Diagnostic);
+                while (HasToken)
+                {
+                    if (CurrentToken is SymbolToken { Symbol: Symbol.Extern or Symbol.Func or Symbol.Struct })
+                    {
+                        break;
+                    }
+
+                    Next();
+                }
+            }
+        }
+
+        return new SyntaxTree(topLevelSyntaxNodes);
+    }
+
+    private ImportSyntax ParseImport(int startIndex)
+    {
+        var name = ExpectIdentifier();
+        return new ImportSyntax(GetTokens(startIndex), name);
+    }
+
+    private ModuleSyntax ParseModule(int startIndex)
+    {
+        var name = ExpectIdentifier();
+        return new ModuleSyntax(GetTokens(startIndex), name);
+    }
+
+    private FuncParameterSyntax ParseFuncParameter()
+    {
+        var startIndex = _tokenIndex;
+        var name = ExpectIdentifier();
+        ExpectSymbol(Symbol.Colon);
+        var type = ParseType();
+
+        return new FuncParameterSyntax(GetTokens(startIndex), name, type);
+    }
+
+    private FuncSyntax ParseFunc(int startIndex, bool exported, StringLiteralToken? externSymbol)
+    {
+        var name = ExpectIdentifier();
+        List<FuncParameterSyntax> parameters = [];
+
+        ExpectSymbol(Symbol.OpenParen);
+
+        while (!TryExpectSymbol(Symbol.CloseParen))
+        {
+            parameters.Add(ParseFuncParameter());
+
+            if (!TryExpectSymbol(Symbol.Comma))
+            {
+                ExpectSymbol(Symbol.CloseParen);
+                break;
+            }
+        }
+
+        var returnType = TryExpectSymbol(Symbol.Colon) ? ParseType() : new VoidTypeSyntax([]);
+
+        var prototype = new FuncPrototypeSyntax(GetTokens(startIndex), name, exported, externSymbol, parameters, returnType);
+
+        BlockSyntax? body = null;
+        var bodyStartIndex = _tokenIndex;
+        if (TryExpectSymbol(Symbol.OpenBrace))
+        {
+            body = ParseBlock(bodyStartIndex);
+        }
+
+        return new FuncSyntax(GetTokens(startIndex), prototype, body);
+    }
+
+    private StructSyntax ParseStruct(int startIndex, bool exported, bool packed)
+    {
+        var name = ExpectIdentifier();
+
+        ExpectSymbol(Symbol.OpenBrace);
+
+        List<StructFieldSyntax> fields = [];
+
+        while (!TryExpectSymbol(Symbol.CloseBrace))
+        {
+            var memberStartIndex = _tokenIndex;
+
+            var fieldName = ExpectIdentifier();
+            ExpectSymbol(Symbol.Colon);
+            var fieldType = ParseType();
+
+            ExpressionSyntax? fieldValue = null;
+
+            if (TryExpectSymbol(Symbol.Assign))
+            {
+                fieldValue = ParseExpression();
+            }
+
+            fields.Add(new StructFieldSyntax(GetTokens(memberStartIndex), fieldName, fieldType, fieldValue));
+        }
+
+        return new StructSyntax(GetTokens(startIndex), name, exported, packed, fields);
+    }
+
+    private EnumSyntax ParseEnum(int startIndex, bool exported)
+    {
+        var name = ExpectIdentifier();
+
+        TypeSyntax? type = null;
+
+        if (TryExpectSymbol(Symbol.Colon))
+        {
+            type = ParseType();
+        }
+
+        List<EnumFieldSyntax> fields = [];
+
+        ExpectSymbol(Symbol.OpenBrace);
+
+        while (!TryExpectSymbol(Symbol.CloseBrace))
+        {
+            var memberStartIndex = _tokenIndex;
+            var fieldName = ExpectIdentifier();
+            IntLiteralToken? value = null;
+
+            if (TryExpectSymbol(Symbol.Assign))
+            {
+                if (!TryExpectIntLiteral(out var intLiteralToken))
+                {
+                    throw new CompileException(Diagnostic
+                        .Error("Value of enum field must be an integer literal")
+                        .At(CurrentToken)
+                        .Build());
+                }
+
+                value = intLiteralToken;
+            }
+
+            fields.Add(new EnumFieldSyntax(GetTokens(memberStartIndex), fieldName, value));
+        }
+
+        return new EnumSyntax(GetTokens(startIndex), name, exported, type, fields);
+    }
+
+    private StatementSyntax ParseStatement()
+    {
+        var startIndex = _tokenIndex;
+
+        if (TryExpectSymbol(out var symbol))
+        {
+            switch (symbol)
+            {
+                case Symbol.OpenBrace:
+                    return ParseBlock(startIndex);
+                case Symbol.Return:
+                    return ParseReturn(startIndex);
+                case Symbol.If:
+                    return ParseIf(startIndex);
+                case Symbol.While:
+                    return ParseWhile(startIndex);
+                case Symbol.For:
+                    return ParseFor(startIndex);
+                case Symbol.Let:
+                    return ParseVariableDeclaration(startIndex);
+                case Symbol.Defer:
+                    return ParseDefer(startIndex);
+                case Symbol.Break:
+                    return new BreakSyntax(GetTokens(startIndex));
+                case Symbol.Continue:
+                    return new ContinueSyntax(GetTokens(startIndex));
+            }
+        }
+
+        var expr = ParseExpression();
+
+        if (TryExpectSymbol(Symbol.Assign))
+        {
+            var value = ParseExpression();
+            return new AssignmentSyntax(GetTokens(startIndex), expr, value);
+        }
+
+        return new StatementExpressionSyntax(GetTokens(startIndex), expr);
+    }
+
+    private VariableDeclarationSyntax ParseVariableDeclaration(int startIndex)
+    {
+        var name = ExpectIdentifier();
+
+        TypeSyntax? explicitType = null;
+        if (TryExpectSymbol(Symbol.Colon))
+        {
+            explicitType = ParseType();
+        }
+
+        ExpressionSyntax? assignment = null;
+        if (TryExpectSymbol(Symbol.Assign))
+        {
+            assignment = ParseExpression();
+        }
+
+        return new VariableDeclarationSyntax(GetTokens(startIndex), name, explicitType, assignment);
+    }
+
+    private DeferSyntax ParseDefer(int startIndex)
+    {
+        var statement = ParseStatement();
+        return new DeferSyntax(GetTokens(startIndex), statement);
+    }
+
+    private ReturnSyntax ParseReturn(int startIndex)
+    {
+        ExpressionSyntax? value = null;
+
+        if (!TryExpectSymbol(Symbol.Semi))
+        {
+            value = ParseExpression();
+        }
+
+        return new ReturnSyntax(GetTokens(startIndex), value);
+    }
+
+    private IfSyntax ParseIf(int startIndex)
+    {
+        var condition = ParseExpression();
+        var body = ParseBlock();
+
+        Variant<IfSyntax, BlockSyntax>? elseStatement = null;
+
+        var elseStartIndex = _tokenIndex;
+        if (TryExpectSymbol(Symbol.Else))
+        {
+            if (TryExpectSymbol(Symbol.If))
+            {
+                elseStatement = (Variant<IfSyntax, BlockSyntax>)ParseIf(elseStartIndex);
+            }
+            else
+            {
+                elseStatement = (Variant<IfSyntax, BlockSyntax>)ParseBlock();
+            }
+        }
+
+        return new IfSyntax(GetTokens(startIndex), condition, body, elseStatement);
+    }
+
+    private WhileSyntax ParseWhile(int startIndex)
+    {
+        var condition = ParseExpression();
+        var body = ParseBlock();
+        return new WhileSyntax(GetTokens(startIndex), condition, body);
+    }
+
+    private ForSyntax ParseFor(int startIndex)
+    {
+        var itemName = ExpectIdentifier();
+        IdentifierToken? indexName = null;
+
+        if (TryExpectSymbol(Symbol.Comma))
+        {
+            indexName = ExpectIdentifier();
+        }
+
+        ExpectSymbol(Symbol.In);
+        var target = ParseExpression();
+        var body = ParseBlock();
+
+        return new ForSyntax(GetTokens(startIndex), itemName, indexName, target, body);
+    }
+
+    private ExpressionSyntax ParseExpression(int precedence = 0)
+    {
+        var startIndex = _tokenIndex;
+        var left = ParsePrimaryExpression();
+
+        while (CurrentToken is SymbolToken symbolToken && TryGetBinaryOperator(symbolToken.Symbol, out var op) && GetBinaryOperatorPrecedence(op.Value) >= precedence)
+        {
+            Next();
+            var right = ParseExpression(GetBinaryOperatorPrecedence(op.Value) + 1);
+            left = new BinaryExpressionSyntax(GetTokens(startIndex), left, op.Value, right);
+        }
+
+        return left;
+    }
+
+    private static int GetBinaryOperatorPrecedence(BinaryOperatorSyntax operatorSyntax)
+    {
+        return operatorSyntax switch
+        {
+            BinaryOperatorSyntax.Multiply => 10,
+            BinaryOperatorSyntax.Divide => 10,
+            BinaryOperatorSyntax.Modulo => 10,
+
+            BinaryOperatorSyntax.Plus => 9,
+            BinaryOperatorSyntax.Minus => 9,
+
+            BinaryOperatorSyntax.LeftShift => 8,
+            BinaryOperatorSyntax.RightShift => 8,
+
+            BinaryOperatorSyntax.GreaterThan => 7,
+            BinaryOperatorSyntax.GreaterThanOrEqual => 7,
+            BinaryOperatorSyntax.LessThan => 7,
+            BinaryOperatorSyntax.LessThanOrEqual => 7,
+
+            BinaryOperatorSyntax.Equal => 7,
+            BinaryOperatorSyntax.NotEqual => 7,
+
+            BinaryOperatorSyntax.BitwiseAnd => 6,
+            BinaryOperatorSyntax.BitwiseXor => 5,
+            BinaryOperatorSyntax.BitwiseOr => 4,
+
+            BinaryOperatorSyntax.LogicalAnd => 3,
+            BinaryOperatorSyntax.LogicalOr => 2,
+
+            _ => throw new ArgumentOutOfRangeException(nameof(operatorSyntax), operatorSyntax, null)
+        };
+    }
+
+    private bool TryGetBinaryOperator(Symbol symbol, [NotNullWhen(true)] out BinaryOperatorSyntax? binaryExpressionOperator)
+    {
+        switch (symbol)
+        {
+            case Symbol.Equal:
+                binaryExpressionOperator = BinaryOperatorSyntax.Equal;
+                return true;
+            case Symbol.NotEqual:
+                binaryExpressionOperator = BinaryOperatorSyntax.NotEqual;
+                return true;
+            case Symbol.LessThan:
+                binaryExpressionOperator = BinaryOperatorSyntax.LessThan;
+                return true;
+            case Symbol.LessThanOrEqual:
+                binaryExpressionOperator = BinaryOperatorSyntax.LessThanOrEqual;
+                return true;
+            case Symbol.GreaterThan:
+                binaryExpressionOperator = BinaryOperatorSyntax.GreaterThan;
+                return true;
+            case Symbol.GreaterThanOrEqual:
+                binaryExpressionOperator = BinaryOperatorSyntax.GreaterThanOrEqual;
+                return true;
+            case Symbol.And:
+                binaryExpressionOperator = BinaryOperatorSyntax.LogicalAnd;
+                return true;
+            case Symbol.Or:
+                binaryExpressionOperator = BinaryOperatorSyntax.LogicalOr;
+                return true;
+            case Symbol.Plus:
+                binaryExpressionOperator = BinaryOperatorSyntax.Plus;
+                return true;
+            case Symbol.Minus:
+                binaryExpressionOperator = BinaryOperatorSyntax.Minus;
+                return true;
+            case Symbol.Star:
+                binaryExpressionOperator = BinaryOperatorSyntax.Multiply;
+                return true;
+            case Symbol.ForwardSlash:
+                binaryExpressionOperator = BinaryOperatorSyntax.Divide;
+                return true;
+            case Symbol.Percent:
+                binaryExpressionOperator = BinaryOperatorSyntax.Modulo;
+                return true;
+            case Symbol.LeftShift:
+                binaryExpressionOperator = BinaryOperatorSyntax.LeftShift;
+                return true;
+            case Symbol.RightShift:
+                binaryExpressionOperator = BinaryOperatorSyntax.RightShift;
+                return true;
+            case Symbol.Ampersand:
+                binaryExpressionOperator = BinaryOperatorSyntax.BitwiseAnd;
+                return true;
+            case Symbol.Pipe:
+                binaryExpressionOperator = BinaryOperatorSyntax.BitwiseOr;
+                return true;
+            case Symbol.XOr:
+                binaryExpressionOperator = BinaryOperatorSyntax.BitwiseXor;
+                return true;
+            default:
+                binaryExpressionOperator = null;
+                return false;
+        }
+    }
+
+    private ExpressionSyntax ParsePrimaryExpression()
+    {
+        var startIndex = _tokenIndex;
+        var token = ExpectToken();
+        var expr = token switch
+        {
+            BoolLiteralToken boolLiteral => new BoolLiteralSyntax(GetTokens(startIndex), boolLiteral),
+            StringLiteralToken stringLiteral => new StringLiteralSyntax(GetTokens(startIndex), stringLiteral),
+            FloatLiteralToken floatLiteral => new FloatLiteralSyntax(GetTokens(startIndex), floatLiteral),
+            IntLiteralToken intLiteral => new IntLiteralSyntax(GetTokens(startIndex), intLiteral),
+            IdentifierToken identifier => ParseIdentifier(startIndex, identifier),
+            SymbolToken symbolToken => symbolToken.Symbol switch
+            {
+                Symbol.Ampersand => new AddressOfSyntax(GetTokens(startIndex), ParsePrimaryExpression()),
+                Symbol.OpenParen => ParseParenthesizedExpression(),
+                Symbol.Minus => new UnaryExpressionSyntax(GetTokens(startIndex), UnaryOperatorSyntax.Negate, ParsePrimaryExpression()),
+                Symbol.Bang => new UnaryExpressionSyntax(GetTokens(startIndex), UnaryOperatorSyntax.Invert, ParsePrimaryExpression()),
+                Symbol.OpenBracket => ParseArrayInitializer(startIndex),
+                Symbol.OpenBrace => new StructInitializerSyntax(GetTokens(startIndex), null, ParseStructInitializerBody()),
+                Symbol.Struct => ParseStructInitializer(startIndex),
+                Symbol.At => ParseBuiltinFunction(startIndex),
+                _ => throw new CompileException(Diagnostic
+                    .Error($"Unexpected symbol '{symbolToken.Symbol}' in expression")
+                    .WithHelp("Expected '(', '-', '!', '[' or '{'")
+                    .At(symbolToken)
+                    .Build())
+            },
+            _ => throw new CompileException(Diagnostic
+                .Error($"Unexpected token '{token.GetType().Name}' in expression")
+                .WithHelp("Expected literal, identifier, or parenthesized expression")
+                .At(token)
+                .Build())
+        };
+
+        return ParsePostfixOperators(expr);
+    }
+
+    private ExpressionSyntax ParseBuiltinFunction(int startIndex)
+    {
+        var name = ExpectIdentifier();
+        ExpectSymbol(Symbol.OpenParen);
+
+        switch (name.Value)
+        {
+            case "size":
+            {
+                var type = ParseType();
+                ExpectSymbol(Symbol.CloseParen);
+                return new SizeSyntax(GetTokens(startIndex), type);
+            }
+            case "cast":
+            {
+                var expression = ParseExpression();
+                ExpectSymbol(Symbol.CloseParen);
+                return new CastSyntax(GetTokens(startIndex), expression);
+            }
+            default:
+            {
+                throw new CompileException(Diagnostic.Error($"Unknown builtin {name.Value}").At(name).Build());
+            }
+        }
+    }
+
+    private ExpressionSyntax ParseIdentifier(int startIndex, IdentifierToken identifier)
+    {
+        if (TryExpectSymbol(Symbol.DoubleColon))
+        {
+            var name = ExpectIdentifier();
+            return new ModuleIdentifierSyntax(GetTokens(startIndex), identifier, name);
+        }
+
+        return new LocalIdentifierSyntax(GetTokens(startIndex), identifier);
+    }
+
+    private ExpressionSyntax ParseParenthesizedExpression()
+    {
+        var expression = ParseExpression();
+        ExpectSymbol(Symbol.CloseParen);
+        return expression;
+    }
+
+    private ExpressionSyntax ParsePostfixOperators(ExpressionSyntax expr)
+    {
+        var startIndex = _tokenIndex;
+        while (HasToken)
+        {
+            if (TryExpectSymbol(Symbol.Caret))
+            {
+                expr = new DereferenceSyntax(GetTokens(startIndex), expr);
+                continue;
+            }
+
+            if (TryExpectSymbol(Symbol.Period))
+            {
+                var member = ExpectIdentifier();
+                expr = new MemberAccessSyntax(GetTokens(startIndex), expr, member);
+                continue;
+            }
+
+            if (TryExpectSymbol(Symbol.OpenBracket))
+            {
+                var index = ParseExpression();
+                ExpectSymbol(Symbol.CloseBracket);
+                expr = new ArrayIndexAccessSyntax(GetTokens(startIndex), expr, index);
+                continue;
+            }
+
+            if (TryExpectSymbol(Symbol.OpenParen))
+            {
+                var parameters = new List<ExpressionSyntax>();
+
+                while (!TryExpectSymbol(Symbol.CloseParen))
+                {
+                    parameters.Add(ParseExpression());
+                    if (!TryExpectSymbol(Symbol.Comma))
+                    {
+                        ExpectSymbol(Symbol.CloseParen);
+                        break;
+                    }
+                }
+
+                expr = new FuncCallSyntax(GetTokens(startIndex), expr, parameters);
+                continue;
+            }
+
+            break;
+        }
+
+        return expr;
+    }
+
+    private ExpressionSyntax ParseArrayInitializer(int startIndex)
+    {
+        var values = new List<ExpressionSyntax>();
+        while (!TryExpectSymbol(Symbol.CloseBracket))
+        {
+            values.Add(ParseExpression());
+            if (!TryExpectSymbol(Symbol.Comma))
+            {
+                ExpectSymbol(Symbol.CloseBracket);
+                break;
+            }
+        }
+
+        return new ArrayInitializerSyntax(GetTokens(startIndex), values);
+    }
+
+    private StructInitializerSyntax ParseStructInitializer(int startIndex)
+    {
+        TypeSyntax? type = null;
+        if (!TryExpectSymbol(Symbol.OpenBrace))
+        {
+            type = ParseType();
+            ExpectSymbol(Symbol.OpenBrace);
+        }
+
+        var initializers = ParseStructInitializerBody();
+
+        return new StructInitializerSyntax(GetTokens(startIndex), type, initializers);
+    }
+
+    private Dictionary<IdentifierToken, ExpressionSyntax> ParseStructInitializerBody()
+    {
+        Dictionary<IdentifierToken, ExpressionSyntax> initializers = [];
+        while (!TryExpectSymbol(Symbol.CloseBrace))
+        {
+            var name = ExpectIdentifier();
+            ExpectSymbol(Symbol.Assign);
+            var value = ParseExpression();
+            initializers.Add(name, value);
+        }
+
+        return initializers;
+    }
+
+    private BlockSyntax ParseBlock()
+    {
+        var startIndex = _tokenIndex;
+        ExpectSymbol(Symbol.OpenBrace);
+        return ParseBlock(startIndex);
+    }
+
+    private BlockSyntax ParseBlock(int startIndex)
+    {
+        List<StatementSyntax> statements = [];
+
+        while (!TryExpectSymbol(Symbol.CloseBrace))
+        {
+            try
+            {
+                statements.Add(ParseStatement());
+            }
+            catch (CompileException ex)
+            {
+                Diagnostics.Add(ex.Diagnostic);
+                if (HasToken)
+                {
+                    Next();
+                }
+                else
+                {
+                    break;
+                }
+            }
+        }
+
+        return new BlockSyntax(GetTokens(startIndex), statements);
+    }
+
+    private TypeSyntax ParseType()
+    {
+        var startIndex = _tokenIndex;
+        if (TryExpectIdentifier(out var name))
+        {
+            if (name.Value[0] == 'u' && ulong.TryParse(name.Value[1..], out var size))
+            {
+                if (size is not 8 and not 16 and not 32 and not 64)
+                {
+                    throw new CompileException(Diagnostic
+                        .Error("Arbitrary uint size is not supported")
+                        .WithHelp("Use u8, u16, u32 or u64")
+                        .At(name)
+                        .Build());
+                }
+
+                return new IntTypeSyntax(GetTokens(startIndex), false, size);
+            }
+
+            if (name.Value[0] == 'i' && ulong.TryParse(name.Value[1..], out size))
+            {
+                if (size is not 8 and not 16 and not 32 and not 64)
+                {
+                    throw new CompileException(Diagnostic
+                        .Error("Arbitrary int size is not supported")
+                        .WithHelp("Use i8, i16, i32 or i64")
+                        .At(name)
+                        .Build());
+                }
+
+                return new IntTypeSyntax(GetTokens(startIndex), true, size);
+            }
+
+            if (name.Value[0] == 'f' && ulong.TryParse(name.Value[1..], out size))
+            {
+                if (size is not 32 and not 64)
+                {
+                    throw new CompileException(Diagnostic
+                        .Error("Arbitrary float size is not supported")
+                        .WithHelp("Use f32 or f64")
+                        .At(name)
+                        .Build());
+                }
+
+                return new FloatTypeSyntax(GetTokens(startIndex), size);
+            }
+
+            switch (name.Value)
+            {
+                case "void":
+                    return new VoidTypeSyntax(GetTokens(startIndex));
+                case "string":
+                    return new StringTypeSyntax(GetTokens(startIndex));
+                case "bool":
+                    return new BoolTypeSyntax(GetTokens(startIndex));
+                default:
+                {
+                    IdentifierToken? module = null;
+
+                    if (TryExpectSymbol(Symbol.DoubleColon))
+                    {
+                        var customTypeName = ExpectIdentifier();
+                        module = name;
+                        name = customTypeName;
+                    }
+
+                    return new CustomTypeSyntax(GetTokens(startIndex), module, name);
+                }
+            }
+        }
+
+        if (TryExpectSymbol(Symbol.Caret))
+        {
+            var baseType = ParseType();
+            return new PointerTypeSyntax(GetTokens(startIndex), baseType);
+        }
+
+        if (TryExpectSymbol(Symbol.Func))
+        {
+            ExpectSymbol(Symbol.OpenParen);
+
+            List<TypeSyntax> parameters = [];
+            while (!TryExpectSymbol(Symbol.CloseParen))
+            {
+                parameters.Add(ParseType());
+                if (!TryExpectSymbol(Symbol.Comma))
+                {
+                    ExpectSymbol(Symbol.CloseParen);
+                    break;
+                }
+            }
+
+            var returnType = TryExpectSymbol(Symbol.Colon)
+                ? ParseType()
+                : new VoidTypeSyntax([]);
+
+            return new FuncTypeSyntax(GetTokens(startIndex), parameters, returnType);
+        }
+
+        if (TryExpectSymbol(Symbol.OpenBracket))
+        {
+            if (TryExpectIntLiteral(out var intLiteral))
+            {
+                ExpectSymbol(Symbol.CloseBracket);
+                var baseType = ParseType();
+                return new ConstArrayTypeSyntax(GetTokens(startIndex), baseType, intLiteral.AsU64);
+            }
+            else if (TryExpectSymbol(Symbol.QuestionMark))
+            {
+                ExpectSymbol(Symbol.CloseBracket);
+                var baseType = ParseType();
+                return new ArrayTypeSyntax(GetTokens(startIndex), baseType);
+            }
+            else
+            {
+                ExpectSymbol(Symbol.CloseBracket);
+                var baseType = ParseType();
+                return new SliceTypeSyntax(GetTokens(startIndex), baseType);
+            }
+        }
+
+        throw new CompileException(Diagnostic
+            .Error("Invalid type syntax")
+            .WithHelp("Expected type name, '^' for pointer, or '[]' for array")
+            .At(CurrentToken)
+            .Build());
+    }
+
+    private Token ExpectToken()
+    {
+        if (!HasToken)
+        {
+            throw new CompileException(Diagnostic
+                .Error("Unexpected end of file")
+                .WithHelp("Expected more tokens to complete the syntax")
+                .At(_tokens[^1])
+                .Build());
+        }
+
+        var token = CurrentToken!;
+        Next();
+        return token;
+    }
+
+    private SymbolToken ExpectSymbol()
+    {
+        var token = ExpectToken();
+        if (token is not SymbolToken symbol)
+        {
+            throw new CompileException(Diagnostic
+                .Error($"Expected symbol, but found {token.GetType().Name}")
+                .WithHelp("This position requires a symbol like '(', ')', '{', '}', etc.")
+                .At(token)
+                .Build());
+        }
+
+        return symbol;
+    }
+
+    private void ExpectSymbol(Symbol expectedSymbol)
+    {
+        var token = ExpectSymbol();
+        if (token.Symbol != expectedSymbol)
+        {
+            throw new CompileException(Diagnostic
+                .Error($"Expected '{expectedSymbol}', but found '{token.Symbol}'")
+                .WithHelp($"Insert '{expectedSymbol}' here")
+                .At(token)
+                .Build());
+        }
+    }
+
+    private bool TryExpectSymbol(out Symbol symbol)
+    {
+        if (CurrentToken is SymbolToken symbolToken)
+        {
+            Next();
+            symbol = symbolToken.Symbol;
+            return true;
+        }
+
+        symbol = default;
+        return false;
+    }
+
+    private bool TryExpectSymbol(Symbol symbol)
+    {
+        if (CurrentToken is SymbolToken symbolToken && symbolToken.Symbol == symbol)
+        {
+            Next();
+            return true;
+        }
+
+        return false;
+    }
+
+    private bool TryExpectIdentifier([NotNullWhen(true)] out IdentifierToken? identifier)
+    {
+        if (CurrentToken is IdentifierToken identifierToken)
+        {
+            identifier = identifierToken;
+            Next();
+            return true;
+        }
+
+        identifier = null;
+        return false;
+    }
+
+    private IdentifierToken ExpectIdentifier()
+    {
+        var token = ExpectToken();
+        if (token is not IdentifierToken identifier)
+        {
+            throw new CompileException(Diagnostic
+                .Error($"Expected identifier, but found {token.GetType().Name}")
+                .WithHelp("Provide a valid identifier name here")
+                .At(token)
+                .Build());
+        }
+
+        return identifier;
+    }
+
+    private bool TryExpectIntLiteral([NotNullWhen(true)] out IntLiteralToken? stringLiteral)
+    {
+        if (CurrentToken is IntLiteralToken token)
+        {
+            stringLiteral = token;
+            Next();
+            return true;
+        }
+
+        stringLiteral = null;
+        return false;
+    }
+
+    private StringLiteralToken ExpectStringLiteral()
+    {
+        var token = ExpectToken();
+        if (token is not StringLiteralToken identifier)
+        {
+            throw new CompileException(Diagnostic
+                .Error($"Expected string literal, but found {token.GetType().Name}")
+                .WithHelp("Provide a valid string literal")
+                .At(token)
+                .Build());
+        }
+
+        return identifier;
+    }
+
+    private void Next()
+    {
+        _tokenIndex++;
+    }
+
+    private List<Token> GetTokens(int tokenStartIndex)
+    {
+        return _tokens.Skip(tokenStartIndex).Take(_tokenIndex - tokenStartIndex).ToList();
+    }
+}
+
+public record SyntaxTree(List<TopLevelSyntaxNode> TopLevelSyntaxNodes);

compiler/NubLang/Syntax/Syntax.cs

@@ -0,0 +1,153 @@
+namespace NubLang.Syntax;
+
+public abstract record SyntaxNode(List<Token> Tokens);
+
+#region Definitions
+
+public record TopLevelSyntaxNode(List<Token> Tokens) : SyntaxNode(Tokens);
+
+public record ModuleSyntax(List<Token> Tokens, IdentifierToken NameToken) : TopLevelSyntaxNode(Tokens);
+
+public record ImportSyntax(List<Token> Tokens, IdentifierToken NameToken) : TopLevelSyntaxNode(Tokens);
+
+public abstract record DefinitionSyntax(List<Token> Tokens, IdentifierToken NameToken, bool Exported) : TopLevelSyntaxNode(Tokens);
+
+public record FuncParameterSyntax(List<Token> Tokens, IdentifierToken NameToken, TypeSyntax Type) : SyntaxNode(Tokens);
+
+public record FuncPrototypeSyntax(List<Token> Tokens, IdentifierToken NameToken, bool Exported, StringLiteralToken? ExternSymbolToken, List<FuncParameterSyntax> Parameters, TypeSyntax ReturnType) : SyntaxNode(Tokens);
+
+public record FuncSyntax(List<Token> Tokens, FuncPrototypeSyntax Prototype, BlockSyntax? Body) : DefinitionSyntax(Tokens, Prototype.NameToken, Prototype.Exported);
+
+public record StructFieldSyntax(List<Token> Tokens, IdentifierToken NameToken, TypeSyntax Type, ExpressionSyntax? Value) : SyntaxNode(Tokens);
+
+public record StructSyntax(List<Token> Tokens, IdentifierToken NameToken, bool Exported, bool Packed, List<StructFieldSyntax> Fields) : DefinitionSyntax(Tokens, NameToken, Exported);
+
+public record EnumFieldSyntax(List<Token> Tokens, IdentifierToken NameToken, IntLiteralToken? ValueToken) : SyntaxNode(Tokens);
+
+public record EnumSyntax(List<Token> Tokens, IdentifierToken NameToken, bool Exported, TypeSyntax? Type, List<EnumFieldSyntax> Fields) : DefinitionSyntax(Tokens, NameToken, Exported);
+
+public enum UnaryOperatorSyntax
+{
+    Negate,
+    Invert
+}
+
+public enum BinaryOperatorSyntax
+{
+    Equal,
+    NotEqual,
+    GreaterThan,
+    GreaterThanOrEqual,
+    LessThan,
+    LessThanOrEqual,
+    LogicalAnd,
+    LogicalOr,
+    Plus,
+    Minus,
+    Multiply,
+    Divide,
+    Modulo,
+    LeftShift,
+    RightShift,
+    BitwiseAnd,
+    BitwiseXor,
+    BitwiseOr,
+}
+
+#endregion
+
+#region Statements
+
+public abstract record StatementSyntax(List<Token> Tokens) : SyntaxNode(Tokens);
+
+public record BlockSyntax(List<Token> Tokens, List<StatementSyntax> Statements) : StatementSyntax(Tokens);
+
+public record StatementExpressionSyntax(List<Token> Tokens, ExpressionSyntax Expression) : StatementSyntax(Tokens);
+
+public record ReturnSyntax(List<Token> Tokens, ExpressionSyntax? Value) : StatementSyntax(Tokens);
+
+public record AssignmentSyntax(List<Token> Tokens, ExpressionSyntax Target, ExpressionSyntax Value) : StatementSyntax(Tokens);
+
+public record IfSyntax(List<Token> Tokens, ExpressionSyntax Condition, BlockSyntax Body, Variant<IfSyntax, BlockSyntax>? Else) : StatementSyntax(Tokens);
+
+public record VariableDeclarationSyntax(List<Token> Tokens, IdentifierToken NameToken, TypeSyntax? ExplicitType, ExpressionSyntax? Assignment) : StatementSyntax(Tokens);
+
+public record ContinueSyntax(List<Token> Tokens) : StatementSyntax(Tokens);
+
+public record BreakSyntax(List<Token> Tokens) : StatementSyntax(Tokens);
+
+public record DeferSyntax(List<Token> Tokens, StatementSyntax Statement) : StatementSyntax(Tokens);
+
+public record WhileSyntax(List<Token> Tokens, ExpressionSyntax Condition, BlockSyntax Body) : StatementSyntax(Tokens);
+
+public record ForSyntax(List<Token> Tokens, IdentifierToken ElementNameToken, IdentifierToken? IndexNameToken, ExpressionSyntax Target, BlockSyntax Body) : StatementSyntax(Tokens);
+
+#endregion
+
+#region Expressions
+
+public abstract record ExpressionSyntax(List<Token> Tokens) : SyntaxNode(Tokens);
+
+public record BinaryExpressionSyntax(List<Token> Tokens, ExpressionSyntax Left, BinaryOperatorSyntax Operator, ExpressionSyntax Right) : ExpressionSyntax(Tokens);
+
+public record UnaryExpressionSyntax(List<Token> Tokens, UnaryOperatorSyntax Operator, ExpressionSyntax Operand) : ExpressionSyntax(Tokens);
+
+public record FuncCallSyntax(List<Token> Tokens, ExpressionSyntax Expression, List<ExpressionSyntax> Parameters) : ExpressionSyntax(Tokens);
+
+public record LocalIdentifierSyntax(List<Token> Tokens, IdentifierToken NameToken) : ExpressionSyntax(Tokens);
+
+public record ModuleIdentifierSyntax(List<Token> Tokens, IdentifierToken ModuleToken, IdentifierToken NameToken) : ExpressionSyntax(Tokens);
+
+public record ArrayInitializerSyntax(List<Token> Tokens, List<ExpressionSyntax> Values) : ExpressionSyntax(Tokens);
+
+public record ArrayIndexAccessSyntax(List<Token> Tokens, ExpressionSyntax Target, ExpressionSyntax Index) : ExpressionSyntax(Tokens);
+
+public record AddressOfSyntax(List<Token> Tokens, ExpressionSyntax Target) : ExpressionSyntax(Tokens);
+
+public record IntLiteralSyntax(List<Token> Tokens, IntLiteralToken Token) : ExpressionSyntax(Tokens);
+
+public record StringLiteralSyntax(List<Token> Tokens, StringLiteralToken Token) : ExpressionSyntax(Tokens);
+
+public record BoolLiteralSyntax(List<Token> Tokens, BoolLiteralToken Token) : ExpressionSyntax(Tokens);
+
+public record FloatLiteralSyntax(List<Token> Tokens, FloatLiteralToken Token) : ExpressionSyntax(Tokens);
+
+public record MemberAccessSyntax(List<Token> Tokens, ExpressionSyntax Target, IdentifierToken MemberToken) : ExpressionSyntax(Tokens);
+
+public record StructInitializerSyntax(List<Token> Tokens, TypeSyntax? StructType, Dictionary<IdentifierToken, ExpressionSyntax> Initializers) : ExpressionSyntax(Tokens);
+
+public record DereferenceSyntax(List<Token> Tokens, ExpressionSyntax Target) : ExpressionSyntax(Tokens);
+
+public record SizeSyntax(List<Token> Tokens, TypeSyntax Type) : ExpressionSyntax(Tokens);
+
+public record CastSyntax(List<Token> Tokens, ExpressionSyntax Value) : ExpressionSyntax(Tokens);
+
+#endregion
+
+#region Types
+
+public abstract record TypeSyntax(List<Token> Tokens) : SyntaxNode(Tokens);
+
+public record FuncTypeSyntax(List<Token> Tokens, List<TypeSyntax> Parameters, TypeSyntax ReturnType) : TypeSyntax(Tokens);
+
+public record PointerTypeSyntax(List<Token> Tokens, TypeSyntax BaseType) : TypeSyntax(Tokens);
+
+public record VoidTypeSyntax(List<Token> Tokens) : TypeSyntax(Tokens);
+
+public record IntTypeSyntax(List<Token> Tokens, bool Signed, ulong Width) : TypeSyntax(Tokens);
+
+public record FloatTypeSyntax(List<Token> Tokens, ulong Width) : TypeSyntax(Tokens);
+
+public record BoolTypeSyntax(List<Token> Tokens) : TypeSyntax(Tokens);
+
+public record StringTypeSyntax(List<Token> Tokens) : TypeSyntax(Tokens);
+
+public record SliceTypeSyntax(List<Token> Tokens, TypeSyntax BaseType) : TypeSyntax(Tokens);
+
+public record ArrayTypeSyntax(List<Token> Tokens, TypeSyntax BaseType) : TypeSyntax(Tokens);
+
+public record ConstArrayTypeSyntax(List<Token> Tokens, TypeSyntax BaseType, ulong Size) : TypeSyntax(Tokens);
+
+public record CustomTypeSyntax(List<Token> Tokens, IdentifierToken? ModuleToken, IdentifierToken NameToken) : TypeSyntax(Tokens);
+
+#endregion

compiler/NubLang/Syntax/Token.cs

@@ -0,0 +1,201 @@
+using NubLang.Diagnostics;
+
+namespace NubLang.Syntax;
+
+public abstract record Token(SourceSpan Span);
+
+public record IdentifierToken(SourceSpan Span, string Value) : Token(Span)
+{
+    public override string ToString()
+    {
+        return Value;
+    }
+}
+
+public record IntLiteralToken(SourceSpan Span, string Value, int Base) : Token(Span)
+{
+    private string GetNumericValue()
+    {
+        // Strip base prefixes: 0b, 0o, 0x
+        return Base switch
+        {
+            2 when Value.StartsWith("0b", StringComparison.OrdinalIgnoreCase)
+                => Value.Substring(2),
+            8 when Value.StartsWith("0o", StringComparison.OrdinalIgnoreCase)
+                => Value.Substring(2),
+            16 when Value.StartsWith("0x", StringComparison.OrdinalIgnoreCase)
+                => Value.Substring(2),
+            _ => Value
+        };
+    }
+
+    public ulong AsU64 => Convert.ToUInt64(GetNumericValue(), Base);
+    public long AsI64 => Convert.ToInt64(GetNumericValue(), Base);
+    public uint AsU32 => Convert.ToUInt32(GetNumericValue(), Base);
+    public int AsI32 => Convert.ToInt32(GetNumericValue(), Base);
+    public ushort AsU16 => Convert.ToUInt16(GetNumericValue(), Base);
+    public short AsI16 => Convert.ToInt16(GetNumericValue(), Base);
+    public byte AsU8 => Convert.ToByte(GetNumericValue(), Base);
+    public sbyte AsI8 => Convert.ToSByte(GetNumericValue(), Base);
+
+    public float AsF32 => Convert.ToSingle(AsI32);
+    public double AsF64 => Convert.ToDouble(AsI64);
+
+    public override string ToString()
+    {
+        return Value;
+    }
+}
+
+public record StringLiteralToken(SourceSpan Span, string Value) : Token(Span)
+{
+    public override string ToString()
+    {
+        return $"\"{Value}\"";
+    }
+}
+
+public record BoolLiteralToken(SourceSpan Span, bool Value) : Token(Span)
+{
+    public override string ToString()
+    {
+        return Value ? "true" : "false";
+    }
+}
+
+public record FloatLiteralToken(SourceSpan Span, string Value) : Token(Span)
+{
+    public float AsF32 => Convert.ToSingle(Value);
+    public double AsF64 => Convert.ToDouble(Value);
+
+    public override string ToString()
+    {
+        return Value;
+    }
+}
+
+public enum Symbol
+{
+    // Default
+    None,
+
+    // Control
+    If,
+    Else,
+    While,
+    For,
+    In,
+    Break,
+    Continue,
+    Return,
+    Let,
+    Defer,
+
+    // Declaration
+    Func,
+    Struct,
+    Enum,
+    Import,
+    Module,
+
+    // Modifier
+    Extern,
+    Packed,
+    Export,
+
+    Colon,
+    DoubleColon,
+    OpenParen,
+    CloseParen,
+    OpenBrace,
+    CloseBrace,
+    OpenBracket,
+    CloseBracket,
+    Comma,
+    Period,
+    Assign,
+    Bang,
+    Equal,
+    NotEqual,
+    LessThan,
+    LessThanOrEqual,
+    GreaterThan,
+    GreaterThanOrEqual,
+    Plus,
+    Minus,
+    Star,
+    ForwardSlash,
+    Caret,
+    Ampersand,
+    Semi,
+    Percent,
+    LeftShift,
+    RightShift,
+    Pipe,
+    And,
+    Or,
+    XOr,
+    At,
+    QuestionMark,
+}
+
+public record SymbolToken(SourceSpan Span, Symbol Symbol) : Token(Span)
+{
+    public override string ToString()
+    {
+        return Symbol switch
+        {
+            Symbol.Func => "func",
+            Symbol.If => "if",
+            Symbol.Else => "else",
+            Symbol.While => "while",
+            Symbol.For => "for",
+            Symbol.In => "in",
+            Symbol.Break => "break",
+            Symbol.Continue => "continue",
+            Symbol.Return => "return",
+            Symbol.Struct => "struct",
+            Symbol.Let => "let",
+            Symbol.Extern => "extern",
+            Symbol.Module => "module",
+            Symbol.Export => "export",
+            Symbol.Import => "import",
+            Symbol.Defer => "defer",
+            Symbol.Enum => "enum",
+            Symbol.Equal => "==",
+            Symbol.NotEqual => "!=",
+            Symbol.LessThanOrEqual => "<=",
+            Symbol.GreaterThanOrEqual => ">=",
+            Symbol.LeftShift => "<<",
+            Symbol.RightShift => ">>",
+            Symbol.And => "&&",
+            Symbol.Or => "||",
+            Symbol.DoubleColon => "::",
+            Symbol.Colon => ":",
+            Symbol.OpenParen => "(",
+            Symbol.CloseParen => ")",
+            Symbol.OpenBrace => "{",
+            Symbol.CloseBrace => "}",
+            Symbol.OpenBracket => "[",
+            Symbol.CloseBracket => "]",
+            Symbol.Comma => ",",
+            Symbol.Period => ".",
+            Symbol.Assign => "=",
+            Symbol.LessThan => "<",
+            Symbol.GreaterThan => ">",
+            Symbol.Plus => "+",
+            Symbol.Minus => "-",
+            Symbol.Star => "*",
+            Symbol.ForwardSlash => "/",
+            Symbol.Bang => "!",
+            Symbol.Caret => "^",
+            Symbol.Ampersand => "&",
+            Symbol.Semi => ";",
+            Symbol.Percent => "%",
+            Symbol.Pipe => "|",
+            Symbol.At => "@",
+            Symbol.QuestionMark => "?",
+            _ => "none",
+        };
+    }
+}

compiler/NubLang/Syntax/Tokenizer.cs

@@ -0,0 +1,389 @@
+using NubLang.Diagnostics;
+
+namespace NubLang.Syntax;
+
+public sealed class Tokenizer
+{
+    private readonly string _fileName;
+    private readonly string _content;
+    private int _index;
+    private int _line = 1;
+    private int _column = 1;
+
+    public Tokenizer(string fileName, string content)
+    {
+        _fileName = fileName;
+        _content = content;
+    }
+
+    public List<Diagnostic> Diagnostics { get; } = new(16);
+    public List<Token> Tokens { get; } = new(256);
+
+    public void Tokenize()
+    {
+        Diagnostics.Clear();
+        Tokens.Clear();
+        _index = 0;
+        _line = 1;
+        _column = 1;
+
+        while (_index < _content.Length)
+        {
+            try
+            {
+                var current = _content[_index];
+
+                if (char.IsWhiteSpace(current))
+                {
+                    if (current == '\n')
+                    {
+                        _line += 1;
+                        _column = 0;
+                    }
+
+                    Next();
+                    continue;
+                }
+
+                if (current == '/' && _index + 1 < _content.Length && _content[_index + 1] == '/')
+                {
+                    Next(2);
+                    while (_index < _content.Length && _content[_index] != '\n')
+                    {
+                        Next();
+                    }
+
+                    continue;
+                }
+
+                Tokens.Add(ParseToken(current, _line, _column));
+            }
+            catch (CompileException e)
+            {
+                Diagnostics.Add(e.Diagnostic);
+                Next();
+            }
+        }
+    }
+
+    private Token ParseToken(char current, int lineStart, int columnStart)
+    {
+        if (char.IsDigit(current))
+        {
+            return ParseNumber(lineStart, columnStart);
+        }
+
+        if (current == '"')
+        {
+            return ParseString(lineStart, columnStart);
+        }
+
+        // note(nub31): Look for keywords (longest first in case a keyword fits partially in a larger keyword)
+        for (var i = 8; i >= 1; i--)
+        {
+            if (TryMatchSymbol(i, lineStart, columnStart, out var token))
+            {
+                return token;
+            }
+        }
+
+        if (char.IsLetter(current) || current == '_')
+        {
+            return ParseIdentifier(lineStart, columnStart);
+        }
+
+        throw new CompileException(Diagnostic.Error($"Unknown token '{current}'").Build());
+    }
+
+    private Token ParseNumber(int lineStart, int columnStart)
+    {
+        var start = _index;
+        var current = _content[_index];
+
+        // note(nub31): 0xFFFFFF
+        if (current == '0' && _index + 1 < _content.Length && _content[_index + 1] == 'x')
+        {
+            Next(2);
+            var digitStart = _index;
+
+            while (_index < _content.Length && Uri.IsHexDigit(_content[_index]))
+            {
+                Next();
+            }
+
+            if (_index == digitStart)
+            {
+                throw new CompileException(Diagnostic
+                    .Error("Invalid hex literal, no digits found")
+                    .At(_fileName, _line, _column)
+                    .Build());
+            }
+
+            return new IntLiteralToken(
+                CreateSpan(lineStart, columnStart),
+                _content.Substring(start, _index - start),
+                16);
+        }
+
+        // note(nub31): 0b11001100
+        if (current == '0' && _index + 1 < _content.Length && _content[_index + 1] == 'b')
+        {
+            Next(2);
+            var digitStart = _index;
+
+            while (_index < _content.Length && (_content[_index] == '0' || _content[_index] == '1'))
+            {
+                Next();
+            }
+
+            if (_index == digitStart)
+            {
+                throw new CompileException(Diagnostic
+                    .Error("Invalid binary literal, no digits found")
+                    .At(_fileName, _line, _column)
+                    .Build());
+            }
+
+            return new IntLiteralToken(
+                CreateSpan(lineStart, columnStart),
+                _content.Substring(start, _index - start),
+                2);
+        }
+
+        // note(nub31): 23/23.5
+        var isFloat = false;
+        while (_index < _content.Length)
+        {
+            var next = _content[_index];
+
+            if (next == '.')
+            {
+                if (isFloat)
+                {
+                    throw new CompileException(Diagnostic
+                        .Error("More than one period found in float literal")
+                        .At(_fileName, _line, _column)
+                        .Build());
+                }
+
+                isFloat = true;
+                Next();
+            }
+            else if (char.IsDigit(next))
+            {
+                Next();
+            }
+            else
+            {
+                break;
+            }
+        }
+
+        var buffer = _content.Substring(start, _index - start);
+
+        return isFloat
+            ? new FloatLiteralToken(CreateSpan(lineStart, columnStart), buffer)
+            : new IntLiteralToken(CreateSpan(lineStart, columnStart), buffer, 10);
+    }
+
+    private StringLiteralToken ParseString(int lineStart, int columnStart)
+    {
+        Next();
+        var start = _index;
+
+        while (true)
+        {
+            if (_index >= _content.Length)
+            {
+                throw new CompileException(Diagnostic
+                    .Error("Unclosed string literal")
+                    .At(_fileName, _line, _column)
+                    .Build());
+            }
+
+            var next = _content[_index];
+
+            if (next == '\n')
+            {
+                throw new CompileException(Diagnostic
+                    .Error("Unclosed string literal (newline found)")
+                    .At(_fileName, _line, _column)
+                    .Build());
+            }
+
+            if (next == '"')
+            {
+                var buffer = _content.Substring(start, _index - start);
+                Next();
+                return new StringLiteralToken(CreateSpan(lineStart, columnStart), buffer);
+            }
+
+            Next();
+        }
+    }
+
+    private bool TryMatchSymbol(int length, int lineStart, int columnStart, out Token token)
+    {
+        token = null!;
+
+        if (_index + length > _content.Length)
+        {
+            return false;
+        }
+
+        var span = _content.AsSpan(_index, length);
+
+        if (span is "true")
+        {
+            Next(4);
+            token = new BoolLiteralToken(CreateSpan(lineStart, columnStart), true);
+            return true;
+        }
+
+        if (span is "false")
+        {
+            Next(5);
+            token = new BoolLiteralToken(CreateSpan(lineStart, columnStart), false);
+            return true;
+        }
+
+        var symbol = length switch
+        {
+            8 => span switch
+            {
+                "continue" => Symbol.Continue,
+                _ => Symbol.None
+            },
+            6 => span switch
+            {
+                "return" => Symbol.Return,
+                "struct" => Symbol.Struct,
+                "extern" => Symbol.Extern,
+                "packed" => Symbol.Packed,
+                "module" => Symbol.Module,
+                "export" => Symbol.Export,
+                "import" => Symbol.Import,
+                _ => Symbol.None
+            },
+            5 => span switch
+            {
+                "break" => Symbol.Break,
+                "while" => Symbol.While,
+                "defer" => Symbol.Defer,
+                _ => Symbol.None
+            },
+            4 => span switch
+            {
+                "func" => Symbol.Func,
+                "else" => Symbol.Else,
+                "enum" => Symbol.Enum,
+                _ => Symbol.None
+            },
+            3 => span switch
+            {
+                "for" => Symbol.For,
+                "let" => Symbol.Let,
+                _ => Symbol.None
+            },
+            2 => span switch
+            {
+                "if" => Symbol.If,
+                "in" => Symbol.In,
+                "==" => Symbol.Equal,
+                "!=" => Symbol.NotEqual,
+                "<=" => Symbol.LessThanOrEqual,
+                ">=" => Symbol.GreaterThanOrEqual,
+                "<<" => Symbol.LeftShift,
+                ">>" => Symbol.RightShift,
+                "&&" => Symbol.And,
+                "||" => Symbol.Or,
+                "::" => Symbol.DoubleColon,
+                "x|" => Symbol.XOr,
+                _ => Symbol.None
+            },
+            1 => span[0] switch
+            {
+                ':' => Symbol.Colon,
+                '(' => Symbol.OpenParen,
+                ')' => Symbol.CloseParen,
+                '{' => Symbol.OpenBrace,
+                '}' => Symbol.CloseBrace,
+                '[' => Symbol.OpenBracket,
+                ']' => Symbol.CloseBracket,
+                ',' => Symbol.Comma,
+                '.' => Symbol.Period,
+                '=' => Symbol.Assign,
+                '<' => Symbol.LessThan,
+                '>' => Symbol.GreaterThan,
+                '+' => Symbol.Plus,
+                '-' => Symbol.Minus,
+                '*' => Symbol.Star,
+                '/' => Symbol.ForwardSlash,
+                '!' => Symbol.Bang,
+                '^' => Symbol.Caret,
+                '&' => Symbol.Ampersand,
+                ';' => Symbol.Semi,
+                '%' => Symbol.Percent,
+                '|' => Symbol.Pipe,
+                '@' => Symbol.At,
+                '?' => Symbol.QuestionMark,
+                _ => Symbol.None
+            },
+            _ => Symbol.None
+        };
+
+        if (symbol != Symbol.None)
+        {
+            var isAlphaKeyword = char.IsLetter(span[0]);
+            if (isAlphaKeyword)
+            {
+                var nextIdx = _index + length;
+                if (nextIdx < _content.Length)
+                {
+                    var nextChar = _content[nextIdx];
+                    if (char.IsLetterOrDigit(nextChar) || nextChar == '_')
+                    {
+                        return false;
+                    }
+                }
+            }
+
+            Next(length);
+            token = new SymbolToken(CreateSpan(lineStart, columnStart), symbol);
+            return true;
+        }
+
+        return false;
+    }
+
+    private IdentifierToken ParseIdentifier(int lineStart, int columnStart)
+    {
+        var start = _index;
+
+        while (_index < _content.Length)
+        {
+            var ch = _content[_index];
+            if (char.IsLetterOrDigit(ch) || ch == '_')
+            {
+                Next();
+            }
+            else
+            {
+                break;
+            }
+        }
+
+        return new IdentifierToken(CreateSpan(lineStart, columnStart), _content.Substring(start, _index - start));
+    }
+
+    private SourceSpan CreateSpan(int lineStart, int columnStart)
+    {
+        return new SourceSpan(_fileName, new SourceLocation(lineStart, columnStart), new SourceLocation(_line, _column));
+    }
+
+    private void Next(int count = 1)
+    {
+        _index += count;
+        _column += count;
+    }
+}

compiler/NubLang/Syntax/TypedModule.cs

@@ -0,0 +1,52 @@
+using NubLang.Ast;
+
+namespace NubLang.Syntax;
+
+public sealed class TypedModule
+{
+    public static TypedModule FromModule(string name, Module module, Dictionary<string, Module> modules)
+    {
+        var typeResolver = new TypeResolver(modules);
+
+        var functionPrototypes = new List<FuncPrototypeNode>();
+
+        foreach (var funcSyntax in module.Functions(true))
+        {
+            var parameters = new List<FuncParameterNode>();
+            foreach (var parameter in funcSyntax.Prototype.Parameters)
+            {
+                parameters.Add(new FuncParameterNode(parameter.Tokens, parameter.NameToken, typeResolver.ResolveType(parameter.Type, name)));
+            }
+
+            var returnType = typeResolver.ResolveType(funcSyntax.Prototype.ReturnType, name);
+
+            functionPrototypes.Add(new FuncPrototypeNode(funcSyntax.Tokens, funcSyntax.Prototype.NameToken, funcSyntax.Prototype.ExternSymbolToken, parameters, returnType));
+        }
+
+        var structTypes = new List<NubStructType>();
+
+        foreach (var structSyntax in module.Structs(true))
+        {
+            var fields = new List<NubStructFieldType>();
+            foreach (var field in structSyntax.Fields)
+            {
+                fields.Add(new NubStructFieldType(field.NameToken.Value, typeResolver.ResolveType(field.Type, name), field.Value != null));
+            }
+
+            structTypes.Add(new NubStructType(name, structSyntax.NameToken.Value, structSyntax.Packed, fields));
+        }
+
+        return new TypedModule(functionPrototypes, structTypes, module.Imports());
+    }
+
+    public TypedModule(List<FuncPrototypeNode> functionPrototypes, List<NubStructType> structTypes, List<string> imports)
+    {
+        FunctionPrototypes = functionPrototypes;
+        StructTypes = structTypes;
+        Imports = imports;
+    }
+
+    public List<FuncPrototypeNode> FunctionPrototypes { get; }
+    public List<NubStructType> StructTypes { get; }
+    public List<string> Imports { get; }
+}

compiler/NubLang/Utils.cs

@@ -0,0 +1,31 @@
+namespace NubLang;
+
+public static class Utils
+{
+    public static int LevenshteinDistance(string a, string b)
+    {
+        if (a == b) return 0;
+        if (a.Length == 0) return b.Length;
+        if (b.Length == 0) return a.Length;
+
+        var costs = new int[b.Length + 1];
+        for (int j = 0; j <= b.Length; j++) costs[j] = j;
+
+        for (int i = 1; i <= a.Length; i++)
+        {
+            costs[0] = i;
+            int prevCost = i - 1;
+            for (int j = 1; j <= b.Length; j++)
+            {
+                int currentCost = costs[j];
+                costs[j] = Math.Min(
+                    Math.Min(costs[j - 1] + 1, costs[j] + 1),
+                    prevCost + (a[i - 1] == b[j - 1] ? 0 : 1)
+                );
+                prevCost = currentCost;
+            }
+        }
+
+        return costs[b.Length];
+    }
+}

compiler/NubLang/Variant.cs

@@ -0,0 +1,75 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace NubLang;
+
+public readonly struct Variant<T1, T2> where T1 : notnull where T2 : notnull
+{
+    public Variant()
+    {
+        throw new InvalidOperationException("Variant must be initialized with a value");
+    }
+
+    public Variant(T1 value)
+    {
+        _value = value;
+    }
+
+    public Variant(T2 value)
+    {
+        _value = value;
+    }
+
+    private readonly object _value;
+
+    public void Match(Action<T1> on1, Action<T2> on2)
+    {
+        switch (_value)
+        {
+            case T1 v1:
+                on1(v1);
+                break;
+            case T2 v2:
+                on2(v2);
+                break;
+            default:
+                throw new InvalidCastException();
+        }
+    }
+
+    public T Match<T>(Func<T1, T> on1, Func<T2, T> on2)
+    {
+        return _value switch
+        {
+            T1 v1 => on1(v1),
+            T2 v2 => on2(v2),
+            _ => throw new InvalidCastException()
+        };
+    }
+
+    public bool IsCase1([NotNullWhen(true)] out T1? value)
+    {
+        if (_value is T1 converted)
+        {
+            value = converted;
+            return true;
+        }
+
+        value = default;
+        return false;
+    }
+
+    public bool IsCase2([NotNullWhen(true)] out T2? value)
+    {
+        if (_value is T2 converted)
+        {
+            value = converted;
+            return true;
+        }
+
+        value = default;
+        return false;
+    }
+
+    public static implicit operator Variant<T1, T2>(T1 value) => new(value);
+    public static implicit operator Variant<T1, T2>(T2 value) => new(value);
+}

compiler/NubLib.cs

@@ -1,110 +0,0 @@
-using System.IO.Compression;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-
-namespace Compiler;
-
-public class NubLib
-{
-    private static readonly JsonSerializerOptions JsonOptions = new()
-    {
-        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
-        WriteIndented = true,
-    };
-
-    public static void Pack(string outputPath, string archivePath, Manifest manifest)
-    {
-        using var fs = new FileStream(outputPath, FileMode.Create);
-        using var zip = new ZipArchive(fs, ZipArchiveMode.Create);
-
-        var manifestEntry = zip.CreateEntry("manifest.json");
-        using (var writer = new StreamWriter(manifestEntry.Open()))
-        {
-            var serialized = JsonSerializer.Serialize(manifest, JsonOptions);
-
-            writer.Write(serialized);
-        }
-
-        var archiveEntry = zip.CreateEntry("lib.a");
-
-        using var entryStream = archiveEntry.Open();
-        using var fileStream = File.OpenRead(archivePath);
-
-        fileStream.CopyTo(entryStream);
-    }
-
-    public static NubLibLoadResult Unpack(string nublibPath)
-    {
-        using var fs = new FileStream(nublibPath, FileMode.Open, FileAccess.Read);
-        using var zip = new ZipArchive(fs, ZipArchiveMode.Read);
-
-        var manifestEntry = zip.GetEntry("manifest.json") ?? throw new FileNotFoundException("Manifest not found in nublib", "manifest.json");
-
-        Manifest manifest;
-        using (var reader = new StreamReader(manifestEntry.Open()))
-        {
-            var json = reader.ReadToEnd();
-            manifest = JsonSerializer.Deserialize<Manifest>(json, JsonOptions) ?? throw new InvalidDataException("Failed to deserialize manifest.json");
-        }
-
-        var archiveEntry = zip.Entries.FirstOrDefault(e => e.Name.EndsWith(".a")) ?? throw new FileNotFoundException("Archive not found in nublib", "*.a");
-
-        string tempArchivePath = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N") + ".a");
-        using (var entryStream = archiveEntry.Open())
-        using (var tempFile = File.Create(tempArchivePath))
-        {
-            entryStream.CopyTo(tempFile);
-        }
-
-        return new NubLibLoadResult(manifest, tempArchivePath);
-    }
-
-    public record NubLibLoadResult(Manifest Manifest, string ArchivePath);
-}
-
-public record Manifest(Dictionary<string, Manifest.Module> Modules)
-{
-    public static Manifest Create(ModuleGraph moduleGraph)
-    {
-        var modules = new Dictionary<string, Module>();
-
-        foreach (var module in moduleGraph.GetModules())
-        {
-            var types = module.GetTypes().ToDictionary(x => x.Key, x => ConvertType(x.Value));
-            var identifiers = module.GetIdentifiers().ToDictionary(x => x.Key, x => new Module.IdentifierInfo(x.Value.Type, x.Value.Exported, x.Value.Extern, x.Value.MangledName));
-            modules[module.Name] = new Module(types, identifiers);
-        }
-
-        return new Manifest(modules);
-
-        static Module.TypeInfo ConvertType(Compiler.Module.TypeInfo typeInfo)
-        {
-            return typeInfo switch
-            {
-                Compiler.Module.TypeInfoStruct s => new Module.TypeInfoStruct(s.Exported, s.Packed, s.Fields.Select(x => new Module.TypeInfoStruct.Field(x.Name, x.Type)).ToList()),
-                Compiler.Module.TypeInfoEnum e => new Module.TypeInfoEnum(e.Exported, e.Variants.Select(v => new Module.TypeInfoEnum.Variant(v.Name, v.Type)).ToList()),
-                _ => throw new ArgumentOutOfRangeException(nameof(typeInfo))
-            };
-        }
-    }
-
-
-    public record Module(Dictionary<string, Module.TypeInfo> Types, Dictionary<string, Module.IdentifierInfo> Identifiers)
-    {
-        public record IdentifierInfo(NubType Type, bool Exported, bool Extern, string MangledName);
-
-        [JsonDerivedType(typeof(TypeInfoStruct), "struct")]
-        [JsonDerivedType(typeof(TypeInfoEnum), "enum")]
-        public abstract record TypeInfo(bool Exported);
-
-        public record TypeInfoStruct(bool Exported, bool Packed, IReadOnlyList<TypeInfoStruct.Field> Fields) : TypeInfo(Exported)
-        {
-            public record Field(string Name, NubType Type);
-        }
-
-        public record TypeInfoEnum(bool Exported, IReadOnlyList<TypeInfoEnum.Variant> Variants) : TypeInfo(Exported)
-        {
-            public record Variant(string Name, NubType? Type);
-        }
-    }
-}

compiler/NubType.cs

@@ -1,708 +0,0 @@
-using System.Text;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-
-namespace Compiler;
-
-[JsonConverter(typeof(NubTypeJsonConverter))]
-public abstract class NubType
-{
-    public abstract override string ToString();
-
-    [Obsolete("Use IsAssignableTo instead of ==", error: true)]
-    public static bool operator ==(NubType? a, NubType? b) => throw new InvalidOperationException("Use IsAssignableTo");
-
-    [Obsolete("Use IsAssignableTo instead of ==", error: true)]
-    public static bool operator !=(NubType? a, NubType? b) => throw new InvalidOperationException("Use IsAssignableTo");
-
-    public bool IsAssignableTo(NubType target)
-    {
-        return (this, target) switch
-        {
-            (NubTypeEnumVariant variant, NubTypeEnum targetEnum) => ReferenceEquals(variant.EnumType, targetEnum),
-            _ => ReferenceEquals(this, target),
-        };
-    }
-}
-
-public class NubTypeVoid : NubType
-{
-    public static readonly NubTypeVoid Instance = new();
-
-    private NubTypeVoid()
-    {
-    }
-
-    public override string ToString() => "void";
-}
-
-public class NubTypeUInt : NubType
-{
-    private static readonly Dictionary<int, NubTypeUInt> Cache = new();
-
-    public static NubTypeUInt Get(int width)
-    {
-        if (!Cache.TryGetValue(width, out var type))
-            Cache[width] = type = new NubTypeUInt(width);
-
-        return type;
-    }
-
-    public int Width { get; }
-
-    private NubTypeUInt(int width)
-    {
-        Width = width;
-    }
-
-    public override string ToString() => $"u{Width}";
-}
-
-public class NubTypeSInt : NubType
-{
-    private static readonly Dictionary<int, NubTypeSInt> Cache = new();
-
-    public static NubTypeSInt Get(int width)
-    {
-        if (!Cache.TryGetValue(width, out var type))
-            Cache[width] = type = new NubTypeSInt(width);
-
-        return type;
-    }
-
-    public int Width { get; }
-
-    private NubTypeSInt(int width)
-    {
-        Width = width;
-    }
-
-    public override string ToString() => $"i{Width}";
-}
-
-public class NubTypeBool : NubType
-{
-    public static readonly NubTypeBool Instance = new();
-
-    private NubTypeBool()
-    {
-    }
-
-    public override string ToString() => "bool";
-}
-
-public class NubTypeString : NubType
-{
-    public static readonly NubTypeString Instance = new();
-
-    private NubTypeString()
-    {
-    }
-
-    public override string ToString() => "string";
-}
-
-public class NubTypeChar : NubType
-{
-    public static readonly NubTypeChar Instance = new();
-
-    private NubTypeChar()
-    {
-    }
-
-    public override string ToString() => "char";
-}
-
-public class NubTypeStruct : NubType
-{
-    private static readonly Dictionary<(string Module, string Name), NubTypeStruct> Cache = new();
-
-    public static NubTypeStruct Get(string module, string name)
-    {
-        if (!Cache.TryGetValue((module, name), out var structType))
-            Cache[(module, name)] = structType = new NubTypeStruct(module, name);
-
-        return structType;
-    }
-
-    private NubTypeStruct(string module, string name)
-    {
-        Module = module;
-        Name = name;
-    }
-
-    public string Module { get; }
-    public string Name { get; }
-
-    public override string ToString() => $"{Module}::{Name}";
-}
-
-public class NubTypeAnonymousStruct : NubType
-{
-    private static readonly Dictionary<Signature, NubTypeAnonymousStruct> Cache = new();
-
-    public static NubTypeAnonymousStruct Get(List<Field> fields)
-    {
-        var sig = new Signature(fields);
-
-        if (!Cache.TryGetValue(sig, out var func))
-            Cache[sig] = func = new NubTypeAnonymousStruct(fields);
-
-        return func;
-    }
-
-    private NubTypeAnonymousStruct(IReadOnlyList<Field> fields)
-    {
-        Fields = fields;
-    }
-
-    public IReadOnlyList<Field> Fields { get; }
-
-    public override string ToString() => $"{{ {string.Join(", ", Fields.Select(x => $"{x.Name}: {x.Type}"))} }}";
-
-    public class Field(string name, NubType type)
-    {
-        public string Name { get; } = name;
-        public NubType Type { get; } = type;
-    }
-
-    private record Signature(IReadOnlyList<Field> Fields);
-}
-
-public class NubTypeEnum : NubType
-{
-    private static readonly Dictionary<(string Module, string Name), NubTypeEnum> Cache = new();
-
-    public static NubTypeEnum Get(string module, string name)
-    {
-        if (!Cache.TryGetValue((module, name), out var enumType))
-            Cache[(module, name)] = enumType = new NubTypeEnum(module, name);
-
-        return enumType;
-    }
-
-    private NubTypeEnum(string module, string name)
-    {
-        Module = module;
-        Name = name;
-    }
-
-    public string Module { get; }
-    public string Name { get; }
-
-    public override string ToString() => $"{Module}::{Name}";
-}
-
-public class NubTypeEnumVariant : NubType
-{
-    private static readonly Dictionary<(NubTypeEnum EnumType, string Variant), NubTypeEnumVariant> Cache = new();
-
-    public static NubTypeEnumVariant Get(NubTypeEnum enumType, string variant)
-    {
-        if (!Cache.TryGetValue((enumType, variant), out var variantType))
-            Cache[(enumType, variant)] = variantType = new NubTypeEnumVariant(enumType, variant);
-
-        return variantType;
-    }
-
-    private NubTypeEnumVariant(NubTypeEnum enumType, string variant)
-    {
-        EnumType = enumType;
-        Variant = variant;
-    }
-
-    public NubTypeEnum EnumType { get; }
-    public string Variant { get; }
-
-    public override string ToString() => $"{EnumType}.{Variant}";
-}
-
-public class NubTypePointer : NubType
-{
-    private static readonly Dictionary<NubType, NubTypePointer> Cache = new();
-
-    public static NubTypePointer Get(NubType to)
-    {
-        if (!Cache.TryGetValue(to, out var ptr))
-            Cache[to] = ptr = new NubTypePointer(to);
-
-        return ptr;
-    }
-
-    public NubType To { get; }
-
-    private NubTypePointer(NubType to)
-    {
-        To = to;
-    }
-
-    public override string ToString() => $"^{To}";
-}
-
-public class NubTypeFunc : NubType
-{
-    private static readonly Dictionary<Signature, NubTypeFunc> Cache = new();
-
-    public static NubTypeFunc Get(List<NubType> parameters, NubType returnType)
-    {
-        var sig = new Signature(parameters, returnType);
-
-        if (!Cache.TryGetValue(sig, out var func))
-            Cache[sig] = func = new NubTypeFunc(parameters, returnType);
-
-        return func;
-    }
-
-    public IReadOnlyList<NubType> Parameters { get; }
-    public NubType ReturnType { get; }
-
-    private NubTypeFunc(List<NubType> parameters, NubType returnType)
-    {
-        Parameters = parameters;
-        ReturnType = returnType;
-    }
-
-    public override string ToString() => $"func({string.Join(' ', Parameters)}): {ReturnType}";
-
-    private record Signature(IReadOnlyList<NubType> Parameters, NubType ReturnType);
-}
-
-public class NubTypeArray : NubType
-{
-    private static readonly Dictionary<NubType, NubTypeArray> Cache = new();
-
-    public static NubTypeArray Get(NubType to)
-    {
-        if (!Cache.TryGetValue(to, out var ptr))
-            Cache[to] = ptr = new NubTypeArray(to);
-
-        return ptr;
-    }
-
-    public NubType ElementType { get; }
-
-    private NubTypeArray(NubType elementType)
-    {
-        ElementType = elementType;
-    }
-
-    public override string ToString() => $"[]{ElementType}";
-}
-
-public class TypeEncoder
-{
-    public static string Encode(NubType type)
-    {
-        return new TypeEncoder().EncodeRoot(type);
-    }
-
-    private TypeEncoder()
-    {
-    }
-
-    private string EncodeRoot(NubType type)
-    {
-        var sb = new StringBuilder();
-        EncodeType(sb, type);
-        return sb.ToString();
-    }
-
-    private void EncodeType(StringBuilder sb, NubType type)
-    {
-        switch (type)
-        {
-            case NubTypeVoid:
-                sb.Append('V');
-                break;
-
-            case NubTypeBool:
-                sb.Append('B');
-                break;
-
-            case NubTypeUInt u:
-                sb.Append($"U(");
-                sb.Append(u.Width);
-                sb.Append(')');
-                break;
-
-            case NubTypeSInt s:
-                sb.Append($"I(");
-                sb.Append(s.Width);
-                sb.Append(')');
-                break;
-
-            case NubTypeString:
-                sb.Append('S');
-                break;
-
-            case NubTypeChar:
-                sb.Append('C');
-                break;
-
-            case NubTypePointer p:
-                sb.Append("P(");
-                EncodeType(sb, p.To);
-                sb.Append(')');
-                break;
-
-            case NubTypeStruct st:
-                sb.Append("TN(");
-                sb.Append(st.Module);
-                sb.Append(':');
-                sb.Append(st.Name);
-                sb.Append(')');
-                break;
-
-            case NubTypeEnum e:
-                sb.Append("EN(");
-                sb.Append(e.Module);
-                sb.Append(':');
-                sb.Append(e.Name);
-                sb.Append(')');
-                break;
-
-            case NubTypeEnumVariant ev:
-                sb.Append("EV(");
-                sb.Append(ev.EnumType.Module);
-                sb.Append(':');
-                sb.Append(ev.EnumType.Name);
-                sb.Append(':');
-                sb.Append(ev.Variant);
-                sb.Append(')');
-                break;
-
-            case NubTypeFunc fn:
-                sb.Append("F(");
-                for (int i = 0; i < fn.Parameters.Count; i++)
-                {
-                    EncodeType(sb, fn.Parameters[i]);
-                }
-                EncodeType(sb, fn.ReturnType);
-                sb.Append(')');
-                break;
-
-            case NubTypeAnonymousStruct s:
-                sb.Append("TA(");
-                foreach (var field in s.Fields)
-                {
-                    sb.Append(field.Name);
-                    sb.Append(':');
-                    EncodeType(sb, field.Type);
-                }
-                sb.Append(')');
-                break;
-
-            case NubTypeArray a:
-                sb.Append("A(");
-                EncodeType(sb, a.ElementType);
-                sb.Append(')');
-                break;
-
-            default:
-                throw new NotSupportedException(type.GetType().Name);
-        }
-    }
-
-    private class Definition(int index)
-    {
-        public int Index { get; } = index;
-        public string? Encoded { get; set; }
-    }
-}
-
-public class TypeDecoder
-{
-    public static NubType Decode(string encoded)
-    {
-        return new TypeDecoder(encoded).DecodeType();
-    }
-
-    private TypeDecoder(string encoded)
-    {
-        this.encoded = encoded;
-    }
-
-    private readonly string encoded;
-    private int index = 0;
-
-    private NubType DecodeType()
-    {
-        var start = Consume();
-        return start switch
-        {
-            'V' => NubTypeVoid.Instance,
-            'B' => NubTypeBool.Instance,
-            'U' => DecodeUInt(),
-            'I' => DecodeSInt(),
-            'S' => NubTypeString.Instance,
-            'C' => NubTypeChar.Instance,
-            'P' => DecodePointer(),
-            'F' => DecodeFunc(),
-            'T' => DecodeStruct(),
-            'E' => DecodeEnum(),
-            'A' => DecodeArray(),
-            _ => throw new Exception($"'{start}' is not a valid start to a type")
-        };
-    }
-
-    private NubTypeUInt DecodeUInt()
-    {
-        Expect('(');
-        var width = ExpectInt();
-        Expect(')');
-        return NubTypeUInt.Get(width);
-    }
-
-    private NubTypeSInt DecodeSInt()
-    {
-        Expect('(');
-        var width = ExpectInt();
-        Expect(')');
-        return NubTypeSInt.Get(width);
-    }
-
-    private NubTypePointer DecodePointer()
-    {
-        Expect('(');
-        var to = DecodeType();
-        Expect(')');
-        return NubTypePointer.Get(to);
-    }
-
-    private NubTypeFunc DecodeFunc()
-    {
-        var types = new List<NubType>();
-
-        Expect('(');
-        while (!TryExpect(')'))
-        {
-            types.Add(DecodeType());
-        }
-
-        return NubTypeFunc.Get(types.Take(types.Count - 1).ToList(), types.Last());
-    }
-
-    private NubType DecodeStruct()
-    {
-
-        if (TryExpect('A'))
-        {
-            var sb = new StringBuilder();
-            var fields = new List<NubTypeAnonymousStruct.Field>();
-
-            Expect('(');
-            while (!TryExpect(')'))
-            {
-                while (!TryExpect(':'))
-                {
-                    sb.Append(Consume());
-                }
-
-                var name = sb.ToString();
-                sb.Clear();
-
-                var type = DecodeType();
-
-                fields.Add(new NubTypeAnonymousStruct.Field(name, type));
-            }
-
-            return NubTypeAnonymousStruct.Get(fields);
-        }
-
-        if (TryExpect('N'))
-        {
-            var sb = new StringBuilder();
-
-            Expect('(');
-            while (!TryExpect(':'))
-                sb.Append(Consume());
-
-            var module = sb.ToString();
-            sb.Clear();
-
-            while (!TryExpect(')'))
-                sb.Append(Consume());
-
-            var name = sb.ToString();
-
-            return NubTypeStruct.Get(module, name);
-        }
-
-        throw new Exception("Expected 'A' or 'N'");
-    }
-
-    private NubType DecodeEnum()
-    {
-        var sb = new StringBuilder();
-
-        if (TryExpect('V'))
-        {
-            Expect('(');
-            while (!TryExpect(':'))
-                sb.Append(Consume());
-
-            var module = sb.ToString();
-            sb.Clear();
-
-            while (!TryExpect(':'))
-                sb.Append(Consume());
-
-            var name = sb.ToString();
-
-            while (!TryExpect(')'))
-                sb.Append(Consume());
-
-            var variant = sb.ToString();
-
-            return NubTypeEnumVariant.Get(NubTypeEnum.Get(module, name), variant);
-        }
-        else if (TryExpect('N'))
-        {
-            Expect('(');
-            while (!TryExpect(':'))
-                sb.Append(Consume());
-
-            var module = sb.ToString();
-            sb.Clear();
-
-            while (!TryExpect(')'))
-                sb.Append(Consume());
-
-            var name = sb.ToString();
-
-            return NubTypeEnum.Get(module, name);
-        }
-
-        throw new Exception($"Expected 'V' or 'N'");
-    }
-
-    private NubTypeArray DecodeArray()
-    {
-        Expect('(');
-        var elementType = DecodeType();
-        Expect(')');
-        return NubTypeArray.Get(elementType);
-    }
-
-    private bool TryPeek(out char c)
-    {
-        if (index >= encoded.Length)
-        {
-            c = '\0';
-            return false;
-        }
-
-        c = encoded[index];
-        return true;
-    }
-
-    private bool TryConsume(out char c)
-    {
-        if (index >= encoded.Length)
-        {
-            c = '\0';
-            return false;
-        }
-
-        c = encoded[index];
-        index += 1;
-
-        return true;
-    }
-
-    private char Consume()
-    {
-        if (!TryConsume(out var c))
-            throw new Exception("Unexpected end of string");
-
-        return c;
-    }
-
-    private bool TryExpect(char c)
-    {
-        if (index >= encoded.Length)
-            return false;
-
-        if (encoded[index] != c)
-            return false;
-
-        Consume();
-        return true;
-    }
-
-    private void Expect(char c)
-    {
-        if (!TryExpect(c))
-            throw new Exception($"Expected '{c}'");
-    }
-
-    private int ExpectInt()
-    {
-        var buf = string.Empty;
-
-        while (TryPeek(out var c))
-        {
-            if (!char.IsDigit(c))
-                break;
-
-            buf += Consume();
-        }
-
-        return int.Parse(buf);
-    }
-}
-
-public class NubTypeJsonConverter : JsonConverter<NubType>
-{
-    public override NubType Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
-    {
-        return TypeDecoder.Decode(reader.GetString()!);
-    }
-
-    public override void Write(Utf8JsonWriter writer, NubType value, JsonSerializerOptions options)
-    {
-        writer.WriteStringValue(TypeEncoder.Encode(value));
-    }
-}
-
-public static class Hashing
-{
-    public static ulong Fnv1a64(string text)
-    {
-        const ulong offset = 14695981039346656037UL;
-        const ulong prime = 1099511628211UL;
-
-        ulong hash = offset;
-        foreach (var c in Encoding.UTF8.GetBytes(text))
-        {
-            hash ^= c;
-            hash *= prime;
-        }
-
-        return hash;
-    }
-}
-
-public static class NameMangler
-{
-    public static string Mangle(string module, string name, NubType type)
-    {
-        var canonical = TypeEncoder.Encode(type);
-        var hash = Hashing.Fnv1a64(canonical);
-
-        return $"nub_{Sanitize(module)}_{Sanitize(name)}_{hash:x16}";
-    }
-
-    private static string Sanitize(string s)
-    {
-        var sb = new StringBuilder(s.Length);
-        foreach (var c in s)
-        {
-            if (char.IsLetterOrDigit(c))
-                sb.Append(c);
-            else
-                sb.Append('_');
-        }
-        return sb.ToString();
-    }
-}

compiler/Program.cs

@@ -1,179 +0,0 @@
-using System.Diagnostics;
-using Compiler;
-
-var nubFiles = new List<string>();
-var libFiles = new List<string>();
-var compileLib = false;
-
-for (int i = 0; i < args.Length; i++)
-{
-    string arg = args[i];
-
-    if (arg.StartsWith("--type="))
-    {
-        var value = arg.Split("--type=")[1];
-        switch (value)
-        {
-            case "lib":
-                compileLib = true;
-                break;
-            case "exe":
-                compileLib = false;
-                break;
-            default:
-                DiagnosticFormatter.Print(Diagnostic.Error("Type must be 'exe' or 'lib'").Build(), Console.Error);
-                return 1;
-        }
-    }
-    else if (arg.EndsWith(".nub"))
-    {
-        nubFiles.Add(arg);
-    }
-    else if (arg.EndsWith(".nublib"))
-    {
-        libFiles.Add(arg);
-    }
-    else if (arg == "--help")
-    {
-        Console.WriteLine("""
-                           Usage: nubc [options] <files>
-
-                           Options:
-                             --type=exe        Compile the input files into an executable (default)
-                             --type=lib        Compile the input files into a library
-                             --help            Show this help message
-
-                           Files:
-                             *.nub             Nub source files to compile
-                             *.nublib          Precompiled Nub libraries to link
-
-                           Example:
-                             nubc --type=exe main.nub utils.nub math.nublib
-                           """);
-    }
-    else
-    {
-        DiagnosticFormatter.Print(Diagnostic.Error($"Unrecognized option '{arg}'").Build(), Console.Error);
-        return 1;
-    }
-}
-
-var moduleGraphBuilder = ModuleGraph.CreateBuilder();
-var asts = new List<Ast>();
-var archivePaths = new List<string>();
-
-foreach (var libPath in libFiles)
-{
-    var lib = NubLib.Unpack(libPath);
-    archivePaths.Add(lib.ArchivePath);
-    moduleGraphBuilder.AddManifest(lib.Manifest);
-}
-
-foreach (var fileName in nubFiles)
-{
-    var file = File.ReadAllText(fileName);
-
-    var tokens = Tokenizer.Tokenize(fileName, file, out var tokenizerDiagnostics);
-
-    foreach (var diagnostic in tokenizerDiagnostics)
-        DiagnosticFormatter.Print(diagnostic, Console.Error);
-
-    if (tokens == null)
-        return 1;
-
-    var ast = Parser.Parse(fileName, tokens, out var parserDiagnostics);
-
-    foreach (var diagnostic in parserDiagnostics)
-        DiagnosticFormatter.Print(diagnostic, Console.Error);
-
-    if (ast == null)
-        return 1;
-
-    moduleGraphBuilder.AddAst(ast);
-    asts.Add(ast);
-}
-
-var moduleGraph = moduleGraphBuilder.Build(out var moduleGraphDiagnostics);
-
-foreach (var diagnostic in moduleGraphDiagnostics)
-    DiagnosticFormatter.Print(diagnostic, Console.Error);
-
-if (moduleGraph == null)
-    return 1;
-
-var functions = new List<TypedNodeDefinitionFunc>();
-
-foreach (var ast in asts)
-{
-    foreach (var func in ast.Definitions.OfType<NodeDefinitionFunc>())
-    {
-        var typedFunction = TypeChecker.CheckFunction(ast.FileName, ast.ModuleName.Ident, func, moduleGraph, out var typeCheckerDiagnostics);
-
-        foreach (var diagnostic in typeCheckerDiagnostics)
-            DiagnosticFormatter.Print(diagnostic, Console.Error);
-
-        if (typedFunction == null)
-            return 1;
-
-        functions.Add(typedFunction);
-    }
-}
-
-if (Directory.Exists(".build"))
-{
-    CleanDirectory(".build");
-}
-else
-{
-    Directory.CreateDirectory(".build");
-}
-
-string? entryPoint = null;
-
-if (!compileLib)
-{
-    if (!moduleGraph.TryResolveIdentifier("main", "main", true, out var info) || info.Type is not NubTypeFunc entryPointType)
-    {
-        DiagnosticFormatter.Print(Diagnostic.Error("func main::main(): i32 is not defined. If you wanted to compile as a library, specify --type=lib").Build(), Console.Error);
-        return 1;
-    }
-
-    if (!entryPointType.ReturnType.IsAssignableTo(NubTypeSInt.Get(32)))
-    {
-        DiagnosticFormatter.Print(Diagnostic.Error($"Entrypoint must return an i32 (currently '{entryPointType.ReturnType}')").Build(), Console.Error);
-        return 1;
-    }
-
-    entryPoint = info.MangledName;
-}
-
-var outFile = Generator.Emit(functions, moduleGraph, entryPoint);
-
-if (compileLib)
-{
-    Process.Start("gcc", ["-Og", "-g", "-Wall", "-Werror", "-c", "-o", ".build/out.o", outFile, .. archivePaths]).WaitForExit();
-    Process.Start("ar", ["rcs", ".build/out.a", ".build/out.o"]).WaitForExit();
-    NubLib.Pack(".build/out.nublib", ".build/out.a", Manifest.Create(moduleGraph));
-}
-else
-{
-    Process.Start("gcc", ["-Og", "-g", "-Wall", "-Werror", "-o", ".build/out", outFile, .. archivePaths]).WaitForExit();
-}
-
-return 0;
-
-static void CleanDirectory(string dirName)
-{
-    var dir = new DirectoryInfo(dirName);
-
-    foreach (var file in dir.GetFiles())
-    {
-        file.Delete();
-    }
-
-    foreach (var subdir in dir.GetDirectories())
-    {
-        CleanDirectory(subdir.FullName);
-        subdir.Delete();
-    }
-}

compiler/Tokenizer.cs

@@ -1,643 +0,0 @@
-using System.Numerics;
-using System.Text;
-
-namespace Compiler;
-
-public class Tokenizer
-{
-    public static List<Token>? Tokenize(string fileName, string contents, out List<Diagnostic> diagnostics)
-    {
-        return new Tokenizer(fileName, contents).Tokenize(out diagnostics);
-    }
-
-    private Tokenizer(string fileName, string contents)
-    {
-        this.fileName = fileName;
-        this.contents = contents;
-    }
-
-    private readonly string fileName;
-    private readonly string contents;
-    private int index;
-    private int line = 1;
-    private int column = 1;
-
-    private List<Token>? Tokenize(out List<Diagnostic> diagnostics)
-    {
-        var tokens = new List<Token>();
-        diagnostics = [];
-
-        while (true)
-        {
-            try
-            {
-                if (!TryPeek(out var c))
-                    break;
-
-                if (char.IsWhiteSpace(c))
-                {
-                    Consume();
-                    continue;
-                }
-
-                if (c == '/' && Peek(1) == '/')
-                {
-                    Consume();
-                    Consume();
-                    while (TryPeek(out c) && c != '\n')
-                        Consume();
-
-                    Consume();
-                    continue;
-                }
-
-                tokens.Add(ParseToken());
-            }
-            catch (CompileException e)
-            {
-                diagnostics.Add(e.Diagnostic);
-                // Skip current token if parsing failed, this prevents an infinite loop when ParseToken fails before consuming any tokens
-                TryConsume(out _);
-            }
-        }
-
-        if (diagnostics.Any(x => x.Severity == Diagnostic.DiagnosticSeverity.Error))
-            return null;
-
-        return tokens;
-    }
-
-    private Token ParseToken()
-    {
-        var startColumn = column;
-        var c = Peek()!.Value;
-
-        if (char.IsDigit(c))
-        {
-            switch (c)
-            {
-                case '0' when Peek(1) is 'x':
-                    {
-                        Consume();
-                        Consume();
-
-                        var parsed = BigInteger.Zero;
-                        var seenDigit = false;
-
-                        while (TryPeek(out c))
-                        {
-                            if (c == '_')
-                            {
-                                Consume();
-                                continue;
-                            }
-
-                            if (!char.IsAsciiHexDigit(c))
-                                break;
-
-                            seenDigit = true;
-                            parsed <<= 4;
-
-                            Consume();
-                            parsed += c switch
-                            {
-                                >= '0' and <= '9' => c - '0',
-                                >= 'a' and <= 'f' => c - 'a' + 10,
-                                >= 'A' and <= 'F' => c - 'A' + 10,
-                                _ => 0
-                            };
-                        }
-
-                        if (!seenDigit)
-                            throw new CompileException(Diagnostic.Error("Expected hexadecimal digits after 0x").At(fileName, line, startColumn, column - startColumn).Build());
-
-                        return new TokenIntLiteral(line, startColumn, column - startColumn, parsed);
-                    }
-                case '0' when Peek(1) is 'b':
-                    {
-                        Consume();
-                        Consume();
-
-                        var parsed = BigInteger.Zero;
-                        var seenDigit = false;
-
-                        while (TryPeek(out c))
-                        {
-                            if (c == '_')
-                            {
-                                Consume();
-                                continue;
-                            }
-
-                            if (c is not '0' and not '1')
-                                break;
-
-                            seenDigit = true;
-                            parsed <<= 1;
-
-                            if (Consume() == '1')
-                                parsed += BigInteger.One;
-                        }
-
-                        if (!seenDigit)
-                            throw new CompileException(Diagnostic.Error("Expected binary digits after 0b").At(fileName, line, startColumn, column - startColumn).Build());
-
-                        return new TokenIntLiteral(line, startColumn, column - startColumn, parsed);
-                    }
-                default:
-                    {
-                        var parsed = BigInteger.Zero;
-
-                        while (TryPeek(out c))
-                        {
-                            if (c == '_')
-                            {
-                                Consume();
-                                continue;
-                            }
-
-                            if (!char.IsDigit(c))
-                                break;
-
-                            parsed *= 10;
-                            parsed += Consume() - '0';
-                        }
-
-                        return new TokenIntLiteral(line, startColumn, column - startColumn, parsed);
-                    }
-            }
-        }
-
-        switch (c)
-        {
-            case '"':
-                {
-                    Consume();
-                    var buf = new StringBuilder();
-
-                    while (true)
-                    {
-                        if (!TryPeek(out c))
-                            throw new CompileException(Diagnostic.Error("Unterminated string literal").At(fileName, line, column, 0).Build());
-
-                        if (c == '"')
-                            break;
-
-                        if (c == '\n')
-                            throw new CompileException(Diagnostic.Error("Unterminated string literal").At(fileName, line, column, 1).Build());
-
-                        buf.Append(Consume());
-                    }
-
-                    Consume();
-                    return new TokenStringLiteral(line, startColumn, column - startColumn, buf.ToString());
-                }
-
-            case '{':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.OpenCurly);
-                }
-            case '}':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.CloseCurly);
-                }
-            case '[':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.OpenSquare);
-                }
-            case ']':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.CloseSquare);
-                }
-            case '(':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.OpenParen);
-                }
-            case ')':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.CloseParen);
-                }
-            case ',':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Comma);
-                }
-            case '.':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Period);
-                }
-            case ':' when Peek(1) is ':':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.ColonColon);
-                }
-            case ':':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Colon);
-                }
-            case '^':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Caret);
-                }
-            case '!' when Peek(1) is '=':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.BangEqual);
-                }
-            case '!':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Bang);
-                }
-            case '=' when Peek(1) is '=':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.EqualEqual);
-                }
-            case '=':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Equal);
-                }
-            case '<' when Peek(1) is '<':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.LessThanLessThan);
-                }
-            case '<' when Peek(1) is '=':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.LessThanEqual);
-                }
-            case '<':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.LessThan);
-                }
-            case '>' when Peek(1) is '>':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.GreaterThanGreaterThan);
-                }
-            case '>' when Peek(1) is '=':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.GreaterThanEqual);
-                }
-            case '>':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.GreaterThan);
-                }
-            case '+' when Peek(1) is '=':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.PlusEqual);
-                }
-            case '+':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Plus);
-                }
-            case '-' when Peek(1) is '=':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.MinusEqual);
-                }
-            case '-':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Minus);
-                }
-            case '*' when Peek(1) is '=':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.StarEqual);
-                }
-            case '*':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Star);
-                }
-            case '/' when Peek(1) is '=':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.ForwardSlashEqual);
-                }
-            case '/':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.ForwardSlash);
-                }
-            case '%' when Peek(1) is '=':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.PercentEqual);
-                }
-            case '%':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Percent);
-                }
-            case '&' when Peek(1) is '&':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.AmpersandAmpersand);
-                }
-            case '&':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Ampersand);
-                }
-            case '|' when Peek(1) is '|':
-                {
-                    Consume();
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.PipePipe);
-                }
-            case '|':
-                {
-                    Consume();
-                    return new TokenSymbol(line, startColumn, column - startColumn, Symbol.Pipe);
-                }
-            default:
-                {
-                    if (char.IsLetter(c) || c == '_')
-                    {
-                        var buf = new StringBuilder();
-
-                        while (TryPeek(out c) && (char.IsLetterOrDigit(c) || c == '_'))
-                            buf.Append(Consume());
-
-                        var value = buf.ToString();
-
-                        return value switch
-                        {
-                            "func" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Func),
-                            "struct" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Struct),
-                            "packed" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Packed),
-                            "enum" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Enum),
-                            "new" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.New),
-                            "match" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Match),
-                            "let" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Let),
-                            "if" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.If),
-                            "else" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Else),
-                            "while" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.While),
-                            "for" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.For),
-                            "in" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.In),
-                            "return" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Return),
-                            "module" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Module),
-                            "export" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Export),
-                            "extern" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Extern),
-                            "true" => new TokenBoolLiteral(line, startColumn, column - startColumn, true),
-                            "false" => new TokenBoolLiteral(line, startColumn, column - startColumn, false),
-                            _ => new TokenIdent(line, startColumn, column - startColumn, value)
-                        };
-                    }
-
-                    throw new CompileException(Diagnostic.Error($"Unexpected character '{c}'").At(fileName, line, column, 1).Build());
-                }
-        }
-    }
-
-    private bool TryConsume(out char c)
-    {
-        if (index >= contents.Length)
-        {
-            c = '\0';
-            return false;
-        }
-
-        c = contents[index];
-
-        if (c == '\n')
-        {
-            line += 1;
-            column = 1;
-        }
-        else
-        {
-            column += 1;
-        }
-
-        index += 1;
-
-        return true;
-    }
-
-    private char Consume()
-    {
-        if (!TryConsume(out var c))
-            throw new CompileException(Diagnostic.Error("Unexpected end of file").At(fileName, line, column, 0).Build());
-
-        return c;
-    }
-
-    private char? Peek(int offset = 0)
-    {
-        if (index + offset >= contents.Length)
-            return null;
-
-        return contents[index + offset];
-    }
-
-    private bool TryPeek(out char c)
-    {
-        if (index >= contents.Length)
-        {
-            c = '\0';
-            return false;
-        }
-
-        c = contents[index];
-        return true;
-    }
-}
-
-public abstract class Token(int line, int column, int length)
-{
-    public int Line { get; } = line;
-    public int Column { get; } = column;
-    public int Length { get; } = length;
-}
-
-public class TokenIdent(int line, int column, int length, string ident) : Token(line, column, length)
-{
-    public string Ident { get; } = ident;
-}
-
-public class TokenIntLiteral(int line, int column, int length, BigInteger value) : Token(line, column, length)
-{
-    public BigInteger Value { get; } = value;
-}
-
-public class TokenStringLiteral(int line, int column, int length, string value) : Token(line, column, length)
-{
-    public string Value { get; } = value;
-}
-
-public class TokenBoolLiteral(int line, int column, int length, bool value) : Token(line, column, length)
-{
-    public bool Value { get; } = value;
-}
-
-public enum Symbol
-{
-    OpenCurly,
-    CloseCurly,
-    OpenParen,
-    CloseParen,
-    OpenSquare,
-    CloseSquare,
-    Comma,
-    Period,
-    Colon,
-    ColonColon,
-    Caret,
-    Bang,
-    Equal,
-    EqualEqual,
-    BangEqual,
-    LessThan,
-    LessThanLessThan,
-    LessThanEqual,
-    GreaterThan,
-    GreaterThanGreaterThan,
-    GreaterThanEqual,
-    Plus,
-    PlusEqual,
-    Minus,
-    MinusEqual,
-    Star,
-    StarEqual,
-    ForwardSlash,
-    ForwardSlashEqual,
-    Percent,
-    PercentEqual,
-    Ampersand,
-    AmpersandAmpersand,
-    Pipe,
-    PipePipe,
-}
-
-public class TokenSymbol(int line, int column, int length, Symbol symbol) : Token(line, column, length)
-{
-    public Symbol Symbol { get; } = symbol;
-}
-
-public enum Keyword
-{
-    Func,
-    Struct,
-    Packed,
-    Enum,
-    New,
-    Match,
-    Let,
-    If,
-    Else,
-    While,
-    For,
-    In,
-    Return,
-    Module,
-    Export,
-    Extern,
-}
-
-public class TokenKeyword(int line, int column, int length, Keyword keyword) : Token(line, column, length)
-{
-    public Keyword Keyword { get; } = keyword;
-}
-
-public static class TokenExtensions
-{
-    public static string AsString(this Symbol symbol)
-    {
-        return symbol switch
-        {
-            Symbol.OpenCurly => "{",
-            Symbol.CloseCurly => "}",
-            Symbol.OpenParen => "(",
-            Symbol.CloseParen => ")",
-            Symbol.OpenSquare => "[",
-            Symbol.CloseSquare => "]",
-            Symbol.Comma => ",",
-            Symbol.Period => ".",
-            Symbol.Colon => ":",
-            Symbol.ColonColon => "::",
-            Symbol.Caret => "^",
-            Symbol.Bang => "!",
-            Symbol.Equal => "=",
-            Symbol.EqualEqual => "==",
-            Symbol.BangEqual => "!=",
-            Symbol.LessThan => "<",
-            Symbol.LessThanLessThan => "<<",
-            Symbol.LessThanEqual => "<=",
-            Symbol.GreaterThan => ">",
-            Symbol.GreaterThanGreaterThan => ">>",
-            Symbol.GreaterThanEqual => ">=",
-            Symbol.Plus => "+",
-            Symbol.PlusEqual => "+=",
-            Symbol.Minus => "-",
-            Symbol.MinusEqual => "-=",
-            Symbol.Star => "*",
-            Symbol.StarEqual => "*=",
-            Symbol.ForwardSlash => "/",
-            Symbol.ForwardSlashEqual => "/=",
-            Symbol.Percent => "%",
-            Symbol.PercentEqual => "%=",
-            Symbol.Ampersand => "&",
-            Symbol.AmpersandAmpersand => "&&",
-            Symbol.Pipe => "|",
-            Symbol.PipePipe => "||",
-            _ => throw new ArgumentOutOfRangeException(nameof(symbol), symbol, null)
-        };
-    }
-
-    public static string AsString(this Keyword symbol)
-    {
-        return symbol switch
-        {
-            Keyword.Func => "func",
-            Keyword.Struct => "struct",
-            Keyword.Packed => "packed",
-            Keyword.Enum => "enum",
-            Keyword.New => "new",
-            Keyword.Match => "enum",
-            Keyword.Let => "let",
-            Keyword.If => "if",
-            Keyword.Else => "else",
-            Keyword.While => "while",
-            Keyword.For => "for",
-            Keyword.In => "in",
-            Keyword.Return => "return",
-            Keyword.Module => "module",
-            Keyword.Export => "export",
-            Keyword.Extern => "extern",
-            _ => throw new ArgumentOutOfRangeException(nameof(symbol), symbol, null)
-        };
-    }
-}

examples/.gitignore

@@ -1 +1,3 @@
 .build
+out.a
+out

examples/build

@@ -1,21 +0,0 @@
-#!/bin/bash
-
-set -e
-
-SCRIPT_DIR=$(dirname "$0")
-
-pushd $SCRIPT_DIR
-    pushd ../compiler
-        dotnet build -c Release
-    popd
-
-    pushd core
-        time ../../compiler/bin/Release/net9.0/Compiler sys.nub print.nub --type=lib
-    popd
-
-    pushd program
-        time ../../compiler/bin/Release/net9.0/Compiler main.nub ../core/.build/out.nublib
-    popd
-
-    ./program/.build/out
-popd

examples/core/print.nub

@@ -1,10 +0,0 @@
-module core
-
-export func print(text: string) {
-    sys::write(0, text.ptr, text.length)
-}
-
-export func println(text: string) {
-    print(text)
-    print("\n")
-}

examples/core/sys.nub

@@ -1,5 +0,0 @@
-module sys
-
-export extern func read(fd: u32, buf: ^char, count: u64): i64
-export extern func write(fd: u32, buf: ^char, count: u64): i64
-export extern func open(fileName: ^char, flags: i32, mode: u16): i64

examples/hello-world/build.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -euo pipefail
+
+obj=$(nubc main.nub)
+clang $obj -o .build/out

examples/hello-world/main.nub

@@ -0,0 +1,9 @@
+module main
+
+extern "puts" func puts(text: ^i8)
+
+extern "main" func main(argc: i64, argv: [?]^i8): i64
+{
+    puts("Hello, World!")
+    return 0
+}

examples/playgroud/build.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -euo pipefail
+
+nubc main.nub
+clang .build/main.ll -o .build/out

examples/playgroud/main.nub

@@ -0,0 +1,7 @@
+module main
+
+extern "puts" func puts(text: ^i8)
+
+extern "main" func main(argc: i64, argv: [?]^i8)
+{
+}

examples/program/main.nub

@@ -1,32 +0,0 @@
-module main
-
-struct Human {
-    name: string
-    age: i32
-}
-
-enum Message {
-    Quit
-    Say: string
-}
-
-func main(): i32 {
-
-    let x = new string("test".ptr) + " " + "uwu"
-    core::println(x)
-
-    let messages: []Message = [new Message::Say("first"), new Message::Quit]
-
-    for message in messages {
-        match message {
-            Say msg {
-                core::println(msg)
-            }
-            Quit {
-                core::println("quit")
-            }
-        }
-    }
-
-    return 0
-}

examples/raylib/build.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -euo pipefail
+
+obj=$(nubc main.nub generated/raylib.nub)
+clang $obj raylib-5.5_linux_amd64/lib/libraylib.a -lm -o .build/out

examples/raylib/main.nub

@@ -0,0 +1,53 @@
+import raylib
+
+module main
+
+extern "main" func main(argc: i64, argv: [?]^i8): i64
+{
+    raylib::SetConfigFlags(raylib::ConfigFlags.FLAG_VSYNC_HINT | raylib::ConfigFlags.FLAG_WINDOW_RESIZABLE)
+
+    raylib::InitWindow(1600, 900, "Hi from nub-lang")
+    defer raylib::CloseWindow()
+
+    raylib::SetTargetFPS(240)
+
+    let width: i32 = 150
+    let height: i32 = 150
+
+    let x: i32 = raylib::GetScreenWidth() / 2 - (width / 2)
+    let y: i32 = raylib::GetScreenHeight() / 2 - (height / 2)
+
+    let direction: raylib::Vector2 = { x = 1 y = 1 }
+    let speed: f32 = 250
+
+    let bgColor: raylib::Color = { r = 0 g = 0 b = 0 a = 255 }
+    let color: raylib::Color = { r = 255 g = 255 b = 255 a = 255 }
+
+    while !raylib::WindowShouldClose()
+    {
+        if x <= 0 {
+            direction.x = 1
+        } else if x + width >= raylib::GetScreenWidth() {
+            direction.x = -1
+        }
+
+        if y <= 0 {
+            direction.y = 1
+        } else if y + height >= raylib::GetScreenHeight() {
+            direction.y = -1
+        }
+
+        x = x + @cast(direction.x * speed * raylib::GetFrameTime())
+        y = y + @cast(direction.y * speed * raylib::GetFrameTime())
+
+        raylib::BeginDrawing()
+        {
+            raylib::ClearBackground(bgColor)
+            raylib::DrawFPS(10, 10)
+            raylib::DrawRectangle(x, y, width, height, color)
+        }
+        raylib::EndDrawing()
+    }
+
+    return 0
+}

examples/raylib/raylib-5.5_linux_amd64/LICENSE

@@ -0,0 +1,16 @@
+Copyright (c) 2013-2024 Ramon Santamaria (@raysan5)
+
+This software is provided "as-is", without any express or implied warranty. In no event 
+will the authors be held liable for any damages arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose, including commercial 
+applications, and to alter it and redistribute it freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not claim that you 
+  wrote the original software. If you use this software in a product, an acknowledgment 
+  in the product documentation would be appreciated but is not required.
+
+  2. Altered source versions must be plainly marked as such, and must not be misrepresented
+  as being the original software.
+
+  3. This notice may not be removed or altered from any source distribution.

examples/raylib/raylib-5.5_linux_amd64/README.md

@@ -0,0 +1,150 @@
+<img align="left" style="width:260px" src="https://github.com/raysan5/raylib/blob/master/logo/raylib_logo_animation.gif" width="288px">
+
+**raylib is a simple and easy-to-use library to enjoy videogames programming.**
+
+raylib is highly inspired by Borland BGI graphics lib and by XNA framework and it's especially well suited for prototyping, tooling, graphical applications, embedded systems and education.
+
+*NOTE for ADVENTURERS: raylib is a programming library to enjoy videogames programming; no fancy interface, no visual helpers, no debug button... just coding in the most pure spartan-programmers way.*
+
+Ready to learn? Jump to [code examples!](https://www.raylib.com/examples.html)
+
+---
+
+<br>
+
+[![GitHub Releases Downloads](https://img.shields.io/github/downloads/raysan5/raylib/total)](https://github.com/raysan5/raylib/releases)
+[![GitHub Stars](https://img.shields.io/github/stars/raysan5/raylib?style=flat&label=stars)](https://github.com/raysan5/raylib/stargazers)
+[![GitHub commits since tagged version](https://img.shields.io/github/commits-since/raysan5/raylib/5.0)](https://github.com/raysan5/raylib/commits/master)
+[![GitHub Sponsors](https://img.shields.io/github/sponsors/raysan5?label=sponsors)](https://github.com/sponsors/raysan5)
+[![Packaging Status](https://repology.org/badge/tiny-repos/raylib.svg)](https://repology.org/project/raylib/versions)
+[![License](https://img.shields.io/badge/license-zlib%2Flibpng-blue.svg)](LICENSE)
+
+[![Discord Members](https://img.shields.io/discord/426912293134270465.svg?label=Discord&logo=discord)](https://discord.gg/raylib)
+[![Reddit Static Badge](https://img.shields.io/badge/-r%2Fraylib-red?style=flat&logo=reddit&label=reddit)](https://www.reddit.com/r/raylib/)
+[![Youtube Subscribers](https://img.shields.io/youtube/channel/subscribers/UC8WIBkhYb5sBNqXO1mZ7WSQ?style=flat&label=Youtube&logo=youtube)](https://www.youtube.com/c/raylib)
+[![Twitch Status](https://img.shields.io/twitch/status/raysan5?style=flat&label=Twitch&logo=twitch)](https://www.twitch.tv/raysan5)
+
+[![Windows](https://github.com/raysan5/raylib/workflows/Windows/badge.svg)](https://github.com/raysan5/raylib/actions?query=workflow%3AWindows)
+[![Linux](https://github.com/raysan5/raylib/workflows/Linux/badge.svg)](https://github.com/raysan5/raylib/actions?query=workflow%3ALinux)
+[![macOS](https://github.com/raysan5/raylib/workflows/macOS/badge.svg)](https://github.com/raysan5/raylib/actions?query=workflow%3AmacOS)
+[![WebAssembly](https://github.com/raysan5/raylib/workflows/WebAssembly/badge.svg)](https://github.com/raysan5/raylib/actions?query=workflow%3AWebAssembly)
+
+[![CMakeBuilds](https://github.com/raysan5/raylib/workflows/CMakeBuilds/badge.svg)](https://github.com/raysan5/raylib/actions?query=workflow%3ACMakeBuilds)
+[![Windows Examples](https://github.com/raysan5/raylib/actions/workflows/windows_examples.yml/badge.svg)](https://github.com/raysan5/raylib/actions/workflows/windows_examples.yml)
+[![Linux Examples](https://github.com/raysan5/raylib/actions/workflows/linux_examples.yml/badge.svg)](https://github.com/raysan5/raylib/actions/workflows/linux_examples.yml)
+
+features
+--------
+  - **NO external dependencies**, all required libraries are [bundled into raylib](https://github.com/raysan5/raylib/tree/master/src/external)
+  - Multiple platforms supported: **Windows, Linux, MacOS, RPI, Android, HTML5... and more!**
+  - Written in plain C code (C99) using PascalCase/camelCase notation
+  - Hardware accelerated with OpenGL (**1.1, 2.1, 3.3, 4.3, ES 2.0, ES 3.0**)
+  - **Unique OpenGL abstraction layer** (usable as standalone module): [rlgl](https://github.com/raysan5/raylib/blob/master/src/rlgl.h)
+  - Multiple **Fonts** formats supported (TTF, OTF, FNT, BDF, sprite fonts)
+  - Multiple texture formats supported, including **compressed formats** (DXT, ETC, ASTC)
+  - **Full 3D support**, including 3D Shapes, Models, Billboards, Heightmaps and more! 
+  - Flexible Materials system, supporting classic maps and **PBR maps**
+  - **Animated 3D models** supported (skeletal bones animation) (IQM, M3D, glTF)
+  - Shaders support, including model shaders and **postprocessing** shaders
+  - **Powerful math module** for Vector, Matrix and Quaternion operations: [raymath](https://github.com/raysan5/raylib/blob/master/src/raymath.h)
+  - Audio loading and playing with streaming support (WAV, QOA, OGG, MP3, FLAC, XM, MOD)
+  - **VR stereo rendering** support with configurable HMD device parameters
+  - Huge examples collection with [+140 code examples](https://github.com/raysan5/raylib/tree/master/examples)!
+  - Bindings to [+70 programming languages](https://github.com/raysan5/raylib/blob/master/BINDINGS.md)!
+  - **Free and open source**
+
+basic example
+--------------
+This is a basic raylib example, it creates a window and draws the text `"Congrats! You created your first window!"` in the middle of the screen. Check this example [running live on web here](https://www.raylib.com/examples/core/loader.html?name=core_basic_window).
+```c
+#include "raylib.h"
+
+int main(void)
+{
+    InitWindow(800, 450, "raylib [core] example - basic window");
+
+    while (!WindowShouldClose())
+    {
+        BeginDrawing();
+            ClearBackground(RAYWHITE);
+            DrawText("Congrats! You created your first window!", 190, 200, 20, LIGHTGRAY);
+        EndDrawing();
+    }
+
+    CloseWindow();
+
+    return 0;
+}
+```
+
+build and installation
+----------------------
+
+raylib binary releases for Windows, Linux, macOS, Android and HTML5 are available at the [Github Releases page](https://github.com/raysan5/raylib/releases).
+
+raylib is also available via multiple package managers on multiple OS distributions.
+
+#### Installing and building raylib on multiple platforms
+
+[raylib Wiki](https://github.com/raysan5/raylib/wiki#development-platforms) contains detailed instructions on building and usage on multiple platforms.
+
+ - [Working on Windows](https://github.com/raysan5/raylib/wiki/Working-on-Windows)
+ - [Working on macOS](https://github.com/raysan5/raylib/wiki/Working-on-macOS)
+ - [Working on GNU Linux](https://github.com/raysan5/raylib/wiki/Working-on-GNU-Linux)
+ - [Working on Chrome OS](https://github.com/raysan5/raylib/wiki/Working-on-Chrome-OS)
+ - [Working on FreeBSD](https://github.com/raysan5/raylib/wiki/Working-on-FreeBSD)
+ - [Working on Raspberry Pi](https://github.com/raysan5/raylib/wiki/Working-on-Raspberry-Pi)
+ - [Working for Android](https://github.com/raysan5/raylib/wiki/Working-for-Android)
+ - [Working for Web (HTML5)](https://github.com/raysan5/raylib/wiki/Working-for-Web-(HTML5))
+ - [Working anywhere with CMake](https://github.com/raysan5/raylib/wiki/Working-with-CMake)
+
+*Note that the Wiki is open for edit, if you find some issues while building raylib for your target platform, feel free to edit the Wiki or open an issue related to it.*
+
+#### Setup raylib with multiple IDEs
+
+raylib has been developed on Windows platform using [Notepad++](https://notepad-plus-plus.org/) and [MinGW GCC](https://www.mingw-w64.org/) compiler but it can be used with other IDEs on multiple platforms.
+
+[Projects directory](https://github.com/raysan5/raylib/tree/master/projects) contains several ready-to-use **project templates** to build raylib and code examples with multiple IDEs.
+
+*Note that there are lots of IDEs supported, some of the provided templates could require some review, so please, if you find some issue with a template or you think they could be improved, feel free to send a PR or open a related issue.*
+
+learning and docs
+------------------
+
+raylib is designed to be learned using [the examples](https://github.com/raysan5/raylib/tree/master/examples) as the main reference. There is no standard API documentation but there is a [**cheatsheet**](https://www.raylib.com/cheatsheet/cheatsheet.html) containing all the functions available on the library a short description of each one of them, input parameters and result value names should be intuitive enough to understand how each function works. 
+
+Some additional documentation about raylib design can be found in [raylib GitHub Wiki](https://github.com/raysan5/raylib/wiki). Here are the relevant links:
+
+ - [raylib cheatsheet](https://www.raylib.com/cheatsheet/cheatsheet.html)
+ - [raylib architecture](https://github.com/raysan5/raylib/wiki/raylib-architecture)
+ - [raylib library design](https://github.com/raysan5/raylib/wiki)
+ - [raylib examples collection](https://github.com/raysan5/raylib/tree/master/examples)
+ - [raylib games collection](https://github.com/raysan5/raylib-games)
+
+
+contact and networks
+---------------------
+
+raylib is present in several networks and raylib community is growing everyday. If you are using raylib and enjoying it, feel free to join us in any of these networks. The most active network is our [Discord server](https://discord.gg/raylib)! :)
+
+ - Webpage: [https://www.raylib.com](https://www.raylib.com)
+ - Discord: [https://discord.gg/raylib](https://discord.gg/raylib)
+ - Twitter: [https://www.twitter.com/raysan5](https://www.twitter.com/raysan5)
+ - Twitch:  [https://www.twitch.tv/raysan5](https://www.twitch.tv/raysan5)
+ - Reddit:  [https://www.reddit.com/r/raylib](https://www.reddit.com/r/raylib)
+ - Patreon: [https://www.patreon.com/raylib](https://www.patreon.com/raylib)
+ - YouTube: [https://www.youtube.com/channel/raylib](https://www.youtube.com/c/raylib)
+
+contributors
+------------
+
+<a href="https://github.com/raysan5/raylib/graphs/contributors">
+  <img src="https://contrib.rocks/image?repo=raysan5/raylib&max=500&columns=20&anon=1" />
+</a>
+
+license
+-------
+
+raylib is licensed under an unmodified zlib/libpng license, which is an OSI-certified, BSD-like license that allows static linking with closed source software. Check [LICENSE](LICENSE) for further details.
+
+raylib uses internally some libraries for window/graphics/inputs management and also to support different file formats loading, all those libraries are embedded with and are available in [src/external](https://github.com/raysan5/raylib/tree/master/src/external) directory. Check [raylib dependencies LICENSES](https://github.com/raysan5/raylib/wiki/raylib-dependencies) on [raylib Wiki](https://github.com/raysan5/raylib/wiki) for details.

examples/raylib/raylib-5.5_linux_amd64/lib/libraylib.so

@@ -0,0 +1 @@
+libraylib.so.550

examples/raylib/raylib-5.5_linux_amd64/lib/libraylib.so.550

@@ -0,0 +1 @@
+libraylib.so.5.5.0

runtime/.gitignore

@@ -0,0 +1 @@
+.build

runtime/build.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -euo pipefail
+
+mkdir -p .build
+clang -c runtime.c -o .build/runtime.o

runtime/ref.c

@@ -0,0 +1,49 @@
+#include "ref.h"
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+void *rc_alloc(size_t size, void (*destructor)(void *self))
+{
+    printf("rc_alloc %zu bytes\n", size);
+    ref_header *header = malloc(sizeof(ref_header) + size);
+    memset(header, 0, size);
+    if (!header)
+    {
+        exit(69);
+    }
+
+    header->ref_count = 1;
+    header->destructor = destructor;
+
+    return (void *)(header + 1);
+}
+
+void rc_retain(void *obj)
+{
+    if (!obj)
+        return;
+
+    printf("rc_retain\n");
+    ref_header *header = ((ref_header *)obj) - 1;
+    header->ref_count++;
+}
+
+void rc_release(void *obj)
+{
+    if (!obj)
+        return;
+
+    ref_header *header = ((ref_header *)obj) - 1;
+    printf("rc_release\n");
+    if (--header->ref_count == 0)
+    {
+        if (header->destructor)
+        {
+            header->destructor(obj);
+        }
+
+        free(header);
+        printf("rc_free\n");
+    }
+}

runtime/ref.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <stddef.h>
+
+typedef struct
+{
+    int ref_count;
+    void (*destructor)(void *self);
+} ref_header;
+
+void *rc_alloc(size_t size, void (*destructor)(void *self));
+void rc_retain(void *obj);
+void rc_release(void *obj);

runtime/runtime.c

@@ -0,0 +1 @@
+#include "ref.c"

vscode-lsp/.gitignore

@@ -0,0 +1,4 @@
+node_modules
+out
+nub-*.vsix
+server

vscode-lsp/.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"name": "Run Extension",
+			"type": "extensionHost",
+			"request": "launch",
+			"args": [
+				"--extensionDevelopmentPath=${workspaceFolder}"
+			],
+			"outFiles": [
+				"${workspaceFolder}/out/**/*.js"
+			],
+			"preLaunchTask": "${defaultBuildTask}"
+		}
+	]
+}

vscode-lsp/.vscode/settings.json

@@ -0,0 +1,8 @@
+{
+	"files.exclude": {},
+	"search.exclude": {
+		"out": true,
+		"node_modules": true,
+	},
+	"typescript.tsc.autoDetect": "off"
+}

vscode-lsp/.vscode/tasks.json

@@ -0,0 +1,18 @@
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "npm",
+			"script": "watch",
+			"problemMatcher": "$tsc-watch",
+			"isBackground": true,
+			"presentation": {
+				"reveal": "never"
+			},
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			}
+		}
+	]
+}

vscode-lsp/language-configuration.json

@@ -0,0 +1,69 @@
+{
+  "comments": {
+    "lineComment": {
+      "comment": "//"
+    },
+    "blockComment": [
+      "/*",
+      "*/"
+    ]
+  },
+  "brackets": [
+    [
+      "{",
+      "}"
+    ],
+    [
+      "[",
+      "]"
+    ],
+    [
+      "(",
+      ")"
+    ]
+  ],
+  "autoClosingPairs": [
+    {
+      "open": "{",
+      "close": "}"
+    },
+    {
+      "open": "[",
+      "close": "]"
+    },
+    {
+      "open": "(",
+      "close": ")"
+    },
+    {
+      "open": "\"",
+      "close": "\""
+    },
+    {
+      "open": "'",
+      "close": "'"
+    }
+  ],
+  "surroundingPairs": [
+    [
+      "{",
+      "}"
+    ],
+    [
+      "[",
+      "]"
+    ],
+    [
+      "(",
+      ")"
+    ],
+    [
+      "\"",
+      "\""
+    ],
+    [
+      "'",
+      "'"
+    ]
+  ]
+}

vscode-lsp/package.json

@@ -0,0 +1,57 @@
+{
+  "name": "nub",
+  "displayName": "Nub Language Support",
+  "description": "Language server client for nub lang",
+  "version": "0.0.1",
+  "publisher": "nub31",
+  "repository": {
+    "type": "git",
+    "url": "https://git.oliste.no/nub31/nub-lang"
+  },
+  "engines": {
+    "vscode": "^1.105.0"
+  },
+  "categories": [
+    "Programming Languages"
+  ],
+  "main": "./out/extension.js",
+  "files": [
+    "out",
+    "server",
+    "syntaxes",
+    "language-configuration.json"
+  ],
+  "contributes": {
+    "languages": [
+      {
+        "id": "nub",
+        "extensions": [
+          ".nub"
+        ],
+        "configuration": "./language-configuration.json"
+      }
+    ],
+    "grammars": [
+      {
+        "language": "nub",
+        "scopeName": "source.nub",
+        "path": "./syntaxes/nub.tmLanguage.json"
+      }
+    ]
+  },
+  "scripts": {
+    "build": "esbuild src/extension.ts --bundle --platform=node --outfile=out/extension.js --external:vscode",
+    "update-lsp": "mkdir -p server && dotnet publish -c Release ../compiler/NubLang.LSP/NubLang.LSP.csproj && cp ../compiler/NubLang.LSP/bin/Release/net9.0/linux-x64/publish/nublsp server/",
+    "package": "npm run update-lsp && npm run build && vsce package --skip-license"
+  },
+  "devDependencies": {
+    "@types/node": "22.x",
+    "@types/vscode": "^1.105.0",
+    "@vscode/vsce": "^3.6.2",
+    "esbuild": "^0.25.11",
+    "typescript": "^5.9.3"
+  },
+  "dependencies": {
+    "vscode-languageclient": "^9.0.1"
+  }
+}

vscode-lsp/src/extension.ts

@@ -0,0 +1,44 @@
+import path from 'path';
+import vscode from 'vscode';
+import { LanguageClient, TransportKind } from 'vscode-languageclient/node';
+
+let client: LanguageClient;
+
+export async function activate(context: vscode.ExtensionContext) {
+	const serverExecutable = path.join(context.asAbsolutePath('server'), "nublsp");
+
+	client = new LanguageClient(
+		'nub',
+		'nub lsp client',
+		{
+			run: {
+				command: serverExecutable,
+				transport: TransportKind.stdio,
+			},
+			debug: {
+				command: serverExecutable,
+				transport: TransportKind.stdio,
+				args: ['--debug'],
+			}
+		},
+		{
+			documentSelector: [
+				{ scheme: 'file', language: 'nub' },
+				{ scheme: 'file', pattern: '**/*.nub' }
+			],
+			synchronize: {
+				fileEvents: vscode.workspace.createFileSystemWatcher('**/.clientrc')
+			}
+		}
+	);
+
+	client.start();
+}
+
+export function deactivate(): Thenable<void> | undefined {
+	if (!client) {
+		return undefined;
+	}
+
+	return client.stop();
+}

vscode-lsp/syntaxes/nub.tmLanguage.json

@@ -0,0 +1,304 @@
+{
+  "$schema": "https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json",
+  "name": "nub",
+  "scopeName": "source.nub",
+  "patterns": [
+    {
+      "include": "#comments"
+    },
+    {
+      "include": "#keywords"
+    },
+    {
+      "include": "#modifiers"
+    },
+    {
+      "include": "#types"
+    },
+    {
+      "include": "#strings"
+    },
+    {
+      "include": "#numbers"
+    },
+    {
+      "include": "#operators"
+    },
+    {
+      "include": "#function-definition"
+    },
+    {
+      "include": "#struct-definition"
+    },
+    {
+      "include": "#function-call"
+    },
+    {
+      "include": "#identifiers"
+    }
+  ],
+  "repository": {
+    "comments": {
+      "patterns": [
+        {
+          "name": "comment.line.double-slash.nub",
+          "begin": "//",
+          "end": "$"
+        },
+        {
+          "name": "comment.block.nub",
+          "begin": "/\\*",
+          "end": "\\*/"
+        }
+      ]
+    },
+    "keywords": {
+      "patterns": [
+        {
+          "name": "keyword.control.nub",
+          "match": "\\b(if|else|while|for|in|break|continue|return|let|defer)\\b"
+        },
+        {
+          "name": "keyword.other.nub",
+          "match": "\\b(func|struct|module|import)\\b"
+        }
+      ]
+    },
+    "modifiers": {
+      "patterns": [
+        {
+          "name": "storage.modifier.nub",
+          "match": "\\b(export|extern)\\b"
+        }
+      ]
+    },
+    "types": {
+      "patterns": [
+        {
+          "include": "#function-type"
+        },
+        {
+          "name": "storage.type.primitive.nub",
+          "match": "\\b(i8|i16|i32|i64|u8|u16|u32|u64|f32|f64|bool|string|cstring|void|any)\\b"
+        },
+        {
+          "name": "storage.type.array.nub",
+          "match": "\\[\\]"
+        },
+        {
+          "name": "storage.type.pointer.nub",
+          "match": "\\^"
+        }
+      ]
+    },
+    "function-type": {
+      "patterns": [
+        {
+          "begin": "\\b(func)\\s*\\(",
+          "beginCaptures": {
+            "1": {
+              "name": "storage.type.function.nub"
+            }
+          },
+          "end": "(?<=\\))(?:\\s*:\\s*([^\\s,;{}()]+))?",
+          "endCaptures": {
+            "1": {
+              "name": "storage.type.nub"
+            }
+          },
+          "patterns": [
+            {
+              "include": "#function-type-parameters"
+            }
+          ]
+        }
+      ]
+    },
+    "function-type-parameters": {
+      "patterns": [
+        {
+          "match": "\\.\\.\\.",
+          "name": "keyword.operator.variadic.nub"
+        },
+        {
+          "include": "#types"
+        },
+        {
+          "match": ",",
+          "name": "punctuation.separator.nub"
+        }
+      ]
+    },
+    "strings": {
+      "patterns": [
+        {
+          "name": "string.quoted.double.nub",
+          "begin": "\"",
+          "end": "\"",
+          "patterns": [
+            {
+              "name": "constant.character.escape.nub",
+              "match": "\\\\(n|t|r|\\\\|\"|')"
+            },
+            {
+              "name": "constant.character.escape.nub",
+              "match": "\\\\[0-7]{1,3}"
+            },
+            {
+              "name": "constant.character.escape.nub",
+              "match": "\\\\x[0-9A-Fa-f]{1,2}"
+            }
+          ]
+        },
+        {
+          "name": "string.quoted.single.nub",
+          "begin": "'",
+          "end": "'",
+          "patterns": [
+            {
+              "name": "constant.character.escape.nub",
+              "match": "\\\\(n|t|r|\\\\|\"|')"
+            }
+          ]
+        }
+      ]
+    },
+    "numbers": {
+      "patterns": [
+        {
+          "name": "constant.numeric.float.nub",
+          "match": "\\b\\d+\\.\\d*([eE][+-]?\\d+)?[fF]?\\b"
+        },
+        {
+          "name": "constant.numeric.integer.decimal.nub",
+          "match": "\\b\\d+\\b"
+        },
+        {
+          "name": "constant.numeric.integer.hexadecimal.nub",
+          "match": "\\b0[xX][0-9A-Fa-f]+\\b"
+        },
+        {
+          "name": "constant.numeric.integer.binary.nub",
+          "match": "\\b0[bB][01]+\\b"
+        }
+      ]
+    },
+    "operators": {
+      "patterns": [
+        {
+          "name": "keyword.operator.assignment.nub",
+          "match": "="
+        },
+        {
+          "name": "keyword.operator.comparison.nub",
+          "match": "(==|!=|<=|>=|<|>)"
+        },
+        {
+          "name": "keyword.operator.arithmetic.nub",
+          "match": "(\\+|\\-|\\*|/)"
+        },
+        {
+          "name": "keyword.operator.logical.nub",
+          "match": "(&&|\\|\\||!)"
+        },
+        {
+          "name": "keyword.operator.address.nub",
+          "match": "&"
+        },
+        {
+          "name": "keyword.operator.dereference.nub",
+          "match": "\\^"
+        },
+        {
+          "name": "keyword.operator.member-access.nub",
+          "match": "\\."
+        },
+        {
+          "name": "keyword.operator.module-access.nub",
+          "match": "::"
+        }
+      ]
+    },
+    "function-definition": {
+      "patterns": [
+        {
+          "begin": "\\b(export\\s+|extern\\s+)?(func)\\s+([a-zA-Z_][a-zA-Z0-9_]*)\\s*\\(",
+          "beginCaptures": {
+            "1": {
+              "name": "storage.modifier.nub"
+            },
+            "2": {
+              "name": "keyword.other.nub"
+            },
+            "3": {
+              "name": "entity.name.function.nub"
+            }
+          },
+          "end": "\\)",
+          "patterns": [
+            {
+              "include": "#function-parameters"
+            }
+          ]
+        }
+      ]
+    },
+    "struct-definition": {
+      "patterns": [
+        {
+          "match": "\\b(struct)\\s+([a-zA-Z_][a-zA-Z0-9_]*)\\b",
+          "captures": {
+            "1": {
+              "name": "keyword.other.nub"
+            },
+            "2": {
+              "name": "entity.name.type.struct.nub"
+            }
+          }
+        }
+      ]
+    },
+    "function-parameters": {
+      "patterns": [
+        {
+          "match": "\\.\\.\\.",
+          "name": "keyword.operator.variadic.nub"
+        },
+        {
+          "match": "([a-zA-Z_][a-zA-Z0-9_]*)\\s*:\\s*",
+          "captures": {
+            "1": {
+              "name": "variable.parameter.nub"
+            }
+          }
+        },
+        {
+          "include": "#types"
+        },
+        {
+          "include": "#identifiers"
+        }
+      ]
+    },
+    "function-call": {
+      "patterns": [
+        {
+          "match": "([a-zA-Z_][a-zA-Z0-9_]*)\\s*(?=\\()",
+          "captures": {
+            "1": {
+              "name": "entity.name.function.call.nub"
+            }
+          }
+        }
+      ]
+    },
+    "identifiers": {
+      "patterns": [
+        {
+          "name": "variable.other.nub",
+          "match": "\\b[a-zA-Z_][a-zA-Z0-9_]*\\b"
+        }
+      ]
+    }
+  }
+}

vscode-lsp/tsconfig.json

@@ -0,0 +1,15 @@
+{
+	"compilerOptions": {
+		"module": "Node16",
+		"target": "ES2022",
+		"outDir": "out",
+		"lib": [
+			"ES2022"
+		],
+		"sourceMap": true,
+		"rootDir": "src",
+		"strict": true,
+		"noImplicitReturns": true,
+		"noFallthroughCasesInSwitch": true
+	}
+}