compiler/ModuleGraph.cs

@@ -191,7 +191,7 @@ public class ModuleGraph
                 return node switch
                 {
                     NodeTypeBool => NubTypeBool.Instance,
-                    NodeTypeCustom type => ResolveCustomType(type, currentModule),
+                    NodeTypeNamed type => ResolveNamedType(type, currentModule),
                     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),
@@ -202,25 +202,103 @@ public class ModuleGraph
                 };
             }
 
-            NubType ResolveCustomType(NodeTypeCustom type, string currentModule)
+            NubType ResolveNamedType(NodeTypeNamed type, string currentModule)
             {
-                var module = modules.GetValueOrDefault(type.Module.Ident);
+                return type.Sections.Count switch
-                if (module == null)
-                    throw new CompileException(Diagnostic.Error($"Unknown module: {type.Module.Ident}").Build());
-
-                var includePrivate = currentModule == type.Module.Ident;
-
-                if (!module.TryResolveType(type.Name.Ident, includePrivate, out var customType))
-                    throw new CompileException(Diagnostic.Error($"Unknown custom type: {type.Module.Ident}::{type.Name.Ident}").Build());
-
-                return customType switch
                 {
-                    Module.TypeInfoStruct => NubTypeStruct.Get(type.Module.Ident, type.Name.Ident),
+                    3 => ResolveThreePartType(type.Sections[0], type.Sections[1], type.Sections[2], currentModule),
-                    Module.TypeInfoEnum => NubTypeEnum.Get(type.Module.Ident, type.Name.Ident),
+                    2 => ResolveTwoPartType(type.Sections[0], type.Sections[1], currentModule),
-                    _ => throw new ArgumentOutOfRangeException(nameof(customType))
+                    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))

compiler/Parser.cs

@@ -384,7 +384,7 @@ public class Parser
             var module = ExpectIdent();
             ExpectSymbol(Symbol.ColonColon);
             var enumName = ExpectIdent();
-            ExpectSymbol(Symbol.Period);
+            ExpectSymbol(Symbol.ColonColon);
             var variantName = ExpectIdent();
 
             var initializers = new List<NodeExpressionEnumLiteral.Initializer>();
@@ -484,9 +484,14 @@ public class Parser
                 case "u64":
                     return new NodeTypeUInt(TokensFrom(startIndex), 64);
                 default:
-                    ExpectSymbol(Symbol.ColonColon);
+                    List<TokenIdent> secitons = [ident];
-                    var name = ExpectIdent();
+                    while (TryExpectSymbol(Symbol.ColonColon))
-                    return new NodeTypeCustom(TokensFrom(startIndex), ident, name);
+                    {
+                        ident = ExpectIdent();
+                        secitons.Add(ident);
+                    }
+
+                    return new NodeTypeNamed(TokensFrom(startIndex), secitons);
             }
         }
 
@@ -938,10 +943,9 @@ public class NodeTypeBool(List<Token> tokens) : NodeType(tokens);
 
 public class NodeTypeString(List<Token> tokens) : NodeType(tokens);
 
-public class NodeTypeCustom(List<Token> tokens, TokenIdent module, TokenIdent name) : NodeType(tokens)
+public class NodeTypeNamed(List<Token> tokens, List<TokenIdent> sections) : NodeType(tokens)
 {
-    public TokenIdent Module { get; } = module;
+    public List<TokenIdent> Sections { get; } = sections;
-    public TokenIdent Name { get; } = name;
 }
 
 public class NodeTypePointer(List<Token> tokens, NodeType to) : NodeType(tokens)

compiler/TypeChecker.cs

@@ -1,22 +1,25 @@
-namespace Compiler;
+using System.Data.Common;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Compiler;
 
 public class TypeChecker
 {
-    public static TypedNodeDefinitionFunc? CheckFunction(string fileName, string moduleName, NodeDefinitionFunc function, ModuleGraph moduleGraph, out List<Diagnostic> diagnostics)
+    public static TypedNodeDefinitionFunc? CheckFunction(string fileName, string currentModule, NodeDefinitionFunc function, ModuleGraph moduleGraph, out List<Diagnostic> diagnostics)
     {
-        return new TypeChecker(fileName, moduleName, function, moduleGraph).CheckFunction(out diagnostics);
+        return new TypeChecker(fileName, currentModule, function, moduleGraph).CheckFunction(out diagnostics);
     }
 
-    private TypeChecker(string fileName, string moduleName, NodeDefinitionFunc function, ModuleGraph moduleGraph)
+    private TypeChecker(string fileName, string currentModule, NodeDefinitionFunc function, ModuleGraph moduleGraph)
     {
         this.fileName = fileName;
-        this.moduleName = moduleName;
+        this.currentModule = currentModule;
         this.function = function;
         this.moduleGraph = moduleGraph;
     }
 
     private readonly string fileName;
-    private readonly string moduleName;
+    private readonly string currentModule;
     private readonly NodeDefinitionFunc function;
     private readonly ModuleGraph moduleGraph;
     private readonly Scope scope = new();
@@ -72,7 +75,7 @@ public class TypeChecker
             if (body == null || returnType is null || invalidParameter)
                 return null;
 
-            return new TypedNodeDefinitionFunc(function.Tokens, moduleName, function.Name, parameters, body, returnType);
+            return new TypedNodeDefinitionFunc(function.Tokens, currentModule, function.Name, parameters, body, returnType);
         }
     }
 
@@ -329,15 +332,9 @@ public class TypeChecker
 
     private TypedNodeExpressionModuleIdent CheckExpressionModuleIdent(NodeExpressionModuleIdent expression)
     {
-        if (!moduleGraph.TryResolveModule(expression.Module.Ident, out var module))
+        var module = ResolveModule(expression.Module);
-            throw new CompileException(Diagnostic.Error($"Module '{expression.Module.Ident}' not found").At(fileName, expression.Module).Build());
+        var info = ResolveModuleIdentifier(module, expression.Value);
-
+        return new TypedNodeExpressionModuleIdent(expression.Tokens, info.Type, expression.Module, expression.Value);
-        var includePrivate = expression.Module.Ident == moduleName;
-
-        if (!module.TryResolveIdentifier(expression.Value.Ident, includePrivate, out var identifierType))
-            throw new CompileException(Diagnostic.Error($"Identifier '{expression.Module.Ident}::{expression.Value.Ident}' not found").At(fileName, expression.Value).Build());
-
-        return new TypedNodeExpressionModuleIdent(expression.Tokens, identifierType.Type, expression.Module, expression.Value);
     }
 
     private TypedNodeExpressionIntLiteral CheckExpressionIntLiteral(NodeExpressionIntLiteral expression)
@@ -356,7 +353,7 @@ public class TypeChecker
                 if (!moduleGraph.TryResolveModule(structType.Module, out var module))
                     throw new CompileException(Diagnostic.Error($"Module '{structType.Module}' not found").At(fileName, expression.Target).Build());
 
-                if (!module.TryResolveType(structType.Name, moduleName == structType.Module, out var typeDef))
+                if (!module.TryResolveType(structType.Name, currentModule == structType.Module, out var typeDef))
                     throw new CompileException(Diagnostic.Error($"Type '{structType.Name}' not found in module '{structType.Module}'").At(fileName, expression.Target).Build());
 
                 if (typeDef is not Module.TypeInfoStruct structDef)
@@ -373,7 +370,7 @@ public class TypeChecker
                 if (!moduleGraph.TryResolveModule(enumVariantType.EnumType.Module, out var module))
                     throw new CompileException(Diagnostic.Error($"Module '{enumVariantType.EnumType.Module}' not found").At(fileName, expression.Target).Build());
 
-                if (!module.TryResolveType(enumVariantType.EnumType.Name, moduleName == enumVariantType.EnumType.Module, out var typeDef))
+                if (!module.TryResolveType(enumVariantType.EnumType.Name, currentModule == enumVariantType.EnumType.Module, out var typeDef))
                     throw new CompileException(Diagnostic.Error($"Type '{enumVariantType.EnumType.Name}' not found in module '{enumVariantType.EnumType.Module}'").At(fileName, expression.Target).Build());
 
                 if (typeDef is not Module.TypeInfoEnum enumDef)
@@ -412,21 +409,12 @@ public class TypeChecker
 
     private TypedNodeExpressionStructLiteral CheckExpressionStructLiteral(NodeExpressionStructLiteral expression)
     {
-        if (!moduleGraph.TryResolveModule(expression.Module.Ident, out var module))
+        var info = ResolveModuleStruct(ResolveModule(expression.Module), expression.Name);
-            throw new CompileException(Diagnostic.Error($"Module '{expression.Module.Ident}' not found").At(fileName, expression.Module).Build());
-
-        var includePrivate = expression.Module.Ident == moduleName;
-
-        if (!module.TryResolveType(expression.Name.Ident, includePrivate, out var typeDef))
-            throw new CompileException(Diagnostic.Error($"Struct '{expression.Module.Ident}::{expression.Name.Ident}' not found").At(fileName, expression.Name).Build());
-
-        if (typeDef is not Module.TypeInfoStruct structDef)
-            throw new CompileException(Diagnostic.Error($"Cannot create struct literal of non-struct type '{expression.Module.Ident}::{expression.Name.Ident}'").At(fileName, expression.Name).Build());
 
         var initializers = new List<TypedNodeExpressionStructLiteral.Initializer>();
         foreach (var initializer in expression.Initializers)
         {
-            var field = structDef.Fields.FirstOrDefault(x => x.Name == initializer.Name.Ident);
+            var field = info.Fields.FirstOrDefault(x => x.Name == initializer.Name.Ident);
             if (field == null)
                 throw new CompileException(Diagnostic.Error($"Field '{initializer.Name.Ident}' does not exist on struct '{expression.Module.Ident}::{expression.Name.Ident}'").At(fileName, initializer.Name).Build());
 
@@ -442,18 +430,9 @@ public class TypeChecker
 
     private TypedNodeExpressionEnumLiteral CheckExpressionEnumLiteral(NodeExpressionEnumLiteral expression)
     {
-        if (!moduleGraph.TryResolveModule(expression.Module.Ident, out var module))
+        var info = ResolveModuleEnum(ResolveModule(expression.Module), expression.EnumName);
-            throw new CompileException(Diagnostic.Error($"Module '{expression.Module.Ident}' not found").At(fileName, expression.Module).Build());
 
-        var includePrivate = expression.Module.Ident == moduleName;
+        var variant = info.Variants.FirstOrDefault(x => x.Name == expression.VariantName.Ident);
-
-        if (!module.TryResolveType(expression.EnumName.Ident, includePrivate, out var typeDef))
-            throw new CompileException(Diagnostic.Error($"Enum '{expression.Module.Ident}::{expression.EnumName.Ident}' not found").At(fileName, expression.EnumName).Build());
-
-        if (typeDef is not Module.TypeInfoEnum enumDef)
-            throw new CompileException(Diagnostic.Error($"Cannot create enum literal of non-enum type '{expression.Module.Ident}::{expression.EnumName.Ident}'").At(fileName, expression.EnumName).Build());
-
-        var variant = enumDef.Variants.FirstOrDefault(x => x.Name == expression.VariantName.Ident);
         if (variant == null)
             throw new CompileException(Diagnostic.Error($"Enum '{expression.Module.Ident}::{expression.EnumName.Ident}' does not have a variant '{expression.VariantName.Ident}'").At(fileName, expression.VariantName).Build());
 
@@ -479,7 +458,7 @@ public class TypeChecker
         return node switch
         {
             NodeTypeBool => NubTypeBool.Instance,
-            NodeTypeCustom type => ResolveCustomType(type),
+            NodeTypeNamed type => ResolveNamedType(type),
             NodeTypeFunc type => NubTypeFunc.Get(type.Parameters.Select(ResolveType).ToList(), ResolveType(type.ReturnType)),
             NodeTypePointer type => NubTypePointer.Get(ResolveType(type.To)),
             NodeTypeSInt type => NubTypeSInt.Get(type.Width),
@@ -490,24 +469,127 @@ public class TypeChecker
         };
     }
 
-    private NubType ResolveCustomType(NodeTypeCustom type)
+    private NubType ResolveNamedType(NodeTypeNamed type)
     {
-        if (!moduleGraph.TryResolveModule(type.Module.Ident, out var module))
+        return type.Sections.Count switch
-            throw new CompileException(Diagnostic.Error($"Module '{type.Module.Ident}' not found").At(fileName, type.Module).Build());
-
-        var includePrivate = type.Module.Ident == moduleName;
-
-        if (!module.TryResolveType(type.Name.Ident, includePrivate, out var customType))
-            throw new CompileException(Diagnostic.Error($"Custom type '{type.Module.Ident}::{type.Name.Ident}' not found").At(fileName, type.Name).Build());
-
-        return customType switch
         {
-            Module.TypeInfoStruct => NubTypeStruct.Get(type.Module.Ident, type.Name.Ident),
+            3 => ResolveThreePartType(type.Sections[0], type.Sections[1], type.Sections[2]),
-            Module.TypeInfoEnum => NubTypeEnum.Get(type.Module.Ident, type.Name.Ident),
+            2 => ResolveTwoPartType(type.Sections[0], type.Sections[1]),
-            _ => throw new ArgumentOutOfRangeException(nameof(customType))
+            1 => ResolveOnePartType(type.Sections[0]),
+            _ => throw BasicError("Invalid type name", type)
         };
     }
 
+    private NubType ResolveThreePartType(TokenIdent first, TokenIdent second, TokenIdent third)
+    {
+        if (TryResolveEnumVariant(currentModule, second.Ident, third.Ident, out var variantType))
+            return variantType;
+
+        throw BasicError($"Enum '{first.Ident}::{second.Ident}::{third.Ident}' does not have a variant named '{third.Ident}'", third);
+    }
+
+    private NubType ResolveTwoPartType(TokenIdent first, TokenIdent second)
+    {
+        if (TryResolveEnumVariant(currentModule, first.Ident, second.Ident, out var variantType))
+            return variantType;
+
+        var typeInfo = ResolveModuleTypeInfo(ResolveModule(first), second);
+        return typeInfo switch
+        {
+            Module.TypeInfoStruct => NubTypeStruct.Get(first.Ident, second.Ident),
+            Module.TypeInfoEnum => NubTypeEnum.Get(first.Ident, second.Ident),
+            _ => throw new ArgumentOutOfRangeException(nameof(typeInfo))
+        };
+    }
+
+    private NubType ResolveOnePartType(TokenIdent name)
+    {
+        if (!moduleGraph.TryResolveModule(currentModule, out var module))
+            throw BasicError($"Module '{currentModule}' not found", name);
+
+        var typeInfo = ResolveModuleTypeInfo(module, name);
+        return typeInfo switch
+        {
+            Module.TypeInfoStruct => NubTypeStruct.Get(currentModule, name.Ident),
+            Module.TypeInfoEnum => NubTypeEnum.Get(currentModule, name.Ident),
+            _ => throw new ArgumentOutOfRangeException(nameof(typeInfo))
+        };
+    }
+
+    private Module ResolveModule(TokenIdent name)
+    {
+        if (!moduleGraph.TryResolveModule(name.Ident, out var module))
+            throw BasicError($"Module '{name.Ident}' not found", name);
+
+        return module;
+    }
+
+    private Module.IdentifierInfo ResolveModuleIdentifier(Module module, TokenIdent name)
+    {
+        if (!module.TryResolveIdentifier(name.Ident, currentModule == module.Name, out var type))
+            throw BasicError($"Identifier '{module.Name}::{name.Ident}' not found", name);
+
+        return type;
+    }
+
+    private Module.TypeInfo ResolveModuleTypeInfo(Module module, TokenIdent name)
+    {
+        if (!module.TryResolveType(name.Ident, currentModule == module.Name, out var type))
+            throw BasicError($"Named type '{module.Name}::{name.Ident}' not found", name);
+
+        return type;
+    }
+
+    private Module.TypeInfoEnum ResolveModuleEnum(Module module, TokenIdent name)
+    {
+        var type = ResolveModuleTypeInfo(module, name);
+        if (type is not Module.TypeInfoEnum info)
+            throw BasicError($"'{module.Name}::{name.Ident}' is not an enum", name);
+
+        return info;
+    }
+
+    private Module.TypeInfoStruct ResolveModuleStruct(Module module, TokenIdent name)
+    {
+        var type = ResolveModuleTypeInfo(module, name);
+        if (type is not Module.TypeInfoStruct info)
+            throw BasicError($"'{module.Name}::{name.Ident}' is not a struct", name);
+
+        return info;
+    }
+
+    private bool TryResolveEnumVariant(string moduleName, string enumName, string variantName, [NotNullWhen(true)] out NubType? result)
+    {
+        result = null;
+
+        if (!moduleGraph.TryResolveModule(moduleName, out var module))
+            return false;
+
+        if (!module.TryResolveType(enumName, true, out var type))
+            return false;
+
+        if (type 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;
+    }
+
+    private CompileException BasicError(string message, TokenIdent ident)
+    {
+        return new CompileException(Diagnostic.Error(message).At(fileName, ident).Build());
+    }
+
+    private CompileException BasicError(string message, Node node)
+    {
+        return new CompileException(Diagnostic.Error(message).At(fileName, node).Build());
+    }
+
     private sealed class Scope
     {
         private readonly Stack<Dictionary<string, NubType>> scopes = new();

examples/math/math.nub

@@ -3,7 +3,7 @@ module math
 struct vec2 { x: i32 y: i32 }
 struct vec3 { x: i32 y: i32 z: i32 }
 struct color { r: i32 g: i32 b: i32 a: i32 }
-struct example { a: math::vec2 b: math::vec3 c: math::color }
+struct example { a: vec2 b: vec3 c: color }
 
 export enum message {
     quit
@@ -15,7 +15,7 @@ export enum message {
 
 export func add(a: i32 b: i32): i32
 {
-    let message: math::message = enum math::message.move { x = 1 y = 1 }
+    let message: message = enum math::message::move { x = 1 y = 1 }
 
     match message {
         quit q {}