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compiler/NubLang/Generation/HeaderGenerator.cs

@@ -0,0 +1,49 @@
+using NubLang.Ast;
+using NubLang.Syntax;
+
+namespace NubLang.Generation;
+
+public static class HeaderGenerator
+{
+    private static string FuncName(string module, string name, string? externSymbol)
+    {
+        return externSymbol ?? $"{module}_{name}";
+    }
+
+    public static string Generate(string name, TypedModule module)
+    {
+        var writer = new IndentedTextWriter();
+
+        writer.WriteLine();
+
+        foreach (var structType in module.StructTypes)
+        {
+            writer.WriteLine("typedef struct");
+            writer.WriteLine("{");
+            using (writer.Indent())
+            {
+                foreach (var field in structType.Fields)
+                {
+                    writer.WriteLine($"{CType.Create(field.Type)} {field.Name};");
+                }
+            }
+
+            writer.WriteLine($"}} {CType.Create(structType)};");
+            writer.WriteLine($"void {CType.Create(structType)}_create({CType.Create(structType)} *self);");
+            writer.WriteLine($"void {CType.Create(structType)}_destroy({CType.Create(structType)} *self);");
+            writer.WriteLine();
+        }
+
+        foreach (var prototype in module.FunctionPrototypes)
+        {
+            var parameters = prototype.Parameters.Count != 0
+                ? string.Join(", ", prototype.Parameters.Select(x => CType.Create(x.Type, x.NameToken.Value)))
+                : "void";
+
+            var funcName = FuncName(name, prototype.NameToken.Value, prototype.ExternSymbolToken?.Value);
+            writer.WriteLine($"{CType.Create(prototype.ReturnType, funcName)}({parameters});");
+        }
+
+        return writer.ToString();
+    }
+}