feat: 模块系统 mod + pub — 多文件编译支持

src/ast/ast.h

@@ -30,6 +30,8 @@ typedef enum {
     AST_ARRAY_ASSIGN_STMT,// arr[i] = expr
     AST_IMPL_BLOCK,       // impl StructName { fn method(...) ... }
     AST_METHOD_CALL,      // receiver.method(args)
+    AST_MOD_DECL,         // mod foo;
+    AST_USE_DECL,         // use foo::bar;
 } AstKind;
 
 typedef enum {
@@ -65,7 +67,7 @@ struct AstNode {
         // AST_FUNCTION
         struct { const char* name; struct AstNode** params; size_t param_count;
                  TypeKind return_type; const char* return_struct_type_name;
-                 struct AstNode* body; } function;
+                 struct AstNode* body; bool is_pub; } function;
         // AST_PARAMETER (也用作结构体字段: name + type)
         struct { const char* name; TypeKind type; const char* struct_type_name; } parameter;
         // AST_BLOCK
@@ -120,6 +122,10 @@ struct AstNode {
         struct { const char* struct_name; struct AstNode** methods; size_t method_count; } impl_block;
         // AST_METHOD_CALL
         struct { struct AstNode* receiver; const char* method_name; struct AstNode** args; const char** arg_names; size_t arg_count; } method_call;
+        // AST_MOD_DECL
+        struct { const char* name; struct AstNode* ast; } mod_decl;
+        // AST_USE_DECL
+        struct { const char* path; const char* item; } use_decl;
     } as;
 };
 
@@ -130,7 +136,8 @@ AstNode* ast_make_program(void* alloc, AstNode** fns, size_t fn_count,
                           AstNode** enums, size_t enum_count,
                           AstNode** impls, size_t impl_count, SourceLoc loc);
 AstNode* ast_make_function(void* alloc, const char* name, AstNode** params, size_t pcount,
-                           TypeKind ret, const char* ret_struct_name, AstNode* body, SourceLoc loc);
+                           TypeKind ret, const char* ret_struct_name, AstNode* body,
+                           bool is_pub, SourceLoc loc);
 AstNode* ast_make_parameter(void* alloc, const char* name, TypeKind type, const char* struct_type_name, SourceLoc loc);
 AstNode* ast_make_block(void* alloc, AstNode** stmts, size_t count, SourceLoc loc);
 AstNode* ast_make_let(void* alloc, const char* name, TypeKind annot_type, bool has_type_annot,
@@ -164,5 +171,7 @@ AstNode* ast_make_index_expr(void* alloc, AstNode* array, AstNode* index, Source
 AstNode* ast_make_array_assign(void* alloc, const char* name, AstNode* index, AstNode* value, SourceLoc loc);
 AstNode* ast_make_impl_block(void* alloc, const char* struct_name, AstNode** methods, size_t count, SourceLoc loc);
 AstNode* ast_make_method_call(void* alloc, AstNode* receiver, const char* method, AstNode** args, const char** arg_names, size_t count, SourceLoc loc);
+AstNode* ast_make_mod_decl(void* alloc, const char* name, AstNode* sub_ast, SourceLoc loc);
+AstNode* ast_make_use_decl(void* alloc, const char* path, const char* item, SourceLoc loc);
 
 #endif