Begin structs, add comment on multiline lambdas, add Ast flags

ccodegen.cpp

@@ -245,8 +245,8 @@ gen_ast(Ast *ast){
       Sym *sym = resolved_get(node);
 
       if(sym->type->kind == TYPE_Lambda){
-        if(node->expr->kind == AST_LAMBDA){
-          Ast_Lambda *lambda = (Ast_Lambda *)node->expr;
+        if(node->value->kind == AST_LAMBDA){
+          Ast_Lambda *lambda = (Ast_Lambda *)node->value;
           gen("static ");
           Ast_Resolved_Type *ret = resolved_type_get(lambda->ret);
           gen_simple_decl(ret, node->name);
@@ -267,7 +267,7 @@ gen_ast(Ast *ast){
         else{
           gen_simple_decl(sym->type, node->name);
           gen(" = ");
-          gen_expr(node->expr);
+          gen_expr((Ast_Expr *)node->value);
           gen(";");
         }
       }

main.cpp

@@ -7,8 +7,32 @@
 #include "new_resolve.cpp"
 #include "ccodegen.cpp"
 
+// 2022.05.28 - On lambda expressions
+// I think it's not wise to add the multiline lambda expressions
+// As is the case with python it would require new alternative syntax.
+// The idea was to imply that the whitespace significant syntax is just
+// inserting '{' '}' ';' automatically and if you decide to write a brace
+// it stops being whitespace significant and you can type everything with semicolons and braces
+// Problem is first of all it's kind of weird to have a completly different syntax
+// in a language to solve something that is a minor inconvenience,
+// second of all it turned out to be kind of bad, maybe if it would be more
+// complicated then it would be ok but it implies that you have to semicolon end
+// a lot of thing unintuitively.
+//
+// Probably single line lambdas should be ok. Currently braces turn off indentation
+// awareness. There might be something you can do by trying to turn that on
+// problem is that complicates parsing a lot cause you have to account for multiple
+// indent styles, which means error messages become bad.
+
+
 /// @todo
 /// [x] - Typespecs should probably be expressions so stuff like would be possible :: *[32]int
+/// [ ] - Add single line lambda expressions/
+/// [ ] - Think about compound expressions, unify with calls - maybe Thing(a=1) instead of Thing{a=1}
+/// [ ] - Structs
+/// [ ] - Enums
+/// [ ] - For loop
+/// [ ] - Switch
 
 
 int main(){
@@ -23,8 +47,8 @@ int main(){
   test_intern_table();
   lex_test();
 
-  String result = compile_file("globals.kl"_s);
-  // String result = compile_file("lambdas.kl"_s);
+  // String result = compile_file("globals.kl"_s);
+  String result = compile_file("structs.kl"_s);
   // String result = compile_file("order_independent_globals.kl"_s);
   printf("%s", result.str);
 

new_ast.cpp

@@ -100,13 +100,14 @@ enum Ast_Kind{
   AST_BLOCK,
   AST_LAMBDA,
   AST_LAMBDA_ARG,
+  AST_STRUCT,
   AST_CONST,
   AST_VAR,
+};
 
-  AST_TYPESPEC_IDENT,
-  AST_TYPESPEC_POINTER,
-  AST_TYPESPEC_ARRAY,
-  AST_TYPESPEC_LAMBDA
+typedef U32 Ast_Flag;
+enum{
+  AST_EXPR = 1,
 };
 
 struct Ast{
@@ -115,11 +116,12 @@ struct Ast{
 
   Ast_Kind kind;
   Ast *parent;
+  Ast_Flag flags;
   // @todo?
   // bool is_atom: 1;
   // bool is_stmt: 1;
-  // bool is_expr: 1;
   // bool is_decl: 1;
+  // bool is_expr: 1;
   // bool is_named: 1;
 };
 
@@ -211,6 +213,12 @@ struct Ast_Array: Ast_Expr{
   Ast_Expr *expr;
 };
 
+struct Ast_Struct: Ast{
+  // Required to be Ast_Struct or Ast_Var or Ast_Const
+  Array<Ast *> members;
+
+};
+
 struct Ast_Named:Ast{
   Intern_String name;
 };
@@ -221,7 +229,7 @@ struct Ast_Var: Ast_Named{
 };
 
 struct Ast_Const: Ast_Named{
-  Ast_Expr *expr;
+  Ast *value;
 };
 
 struct Ast_Package:Ast{
@@ -240,22 +248,25 @@ struct Ast_Package:Ast{
   result->id      = ++pctx->unique_ids
 
 function Ast_Atom *
-ast_str(Token *pos, Intern_String string){
+ast_str(Token *pos, Intern_String string, Ast_Flag flags = 0){
   AST_NEW(Atom, STR, pos);
+  result->flags = flags;
   result->intern_val = string;
   return result;
 }
 
 function Ast_Atom *
-ast_ident(Token *pos, Intern_String string){
+ast_ident(Token *pos, Intern_String string, Ast_Flag flags = 0){
   AST_NEW(Atom, IDENT, pos);
+  result->flags = flags;
   result->intern_val = string;
   return result;
 }
 
 function Ast_Atom *
-ast_int(Token *pos, S64 integer){
+ast_int(Token *pos, S64 integer, Ast_Flag flags){
   AST_NEW(Atom, INT, pos);
+  result->flags = flags;
   result->int_val = integer;
   return result;
 }
@@ -263,6 +274,7 @@ ast_int(Token *pos, S64 integer){
 function Ast_Expr *
 ast_expr_binary(Ast_Expr *left, Ast_Expr *right, Token *op){
   AST_NEW(Binary, BINARY, op);
+  result->flags = AST_EXPR;
   result->op    = op->kind;
   result->left  = left;
   result->right = right;
@@ -274,6 +286,7 @@ ast_expr_binary(Ast_Expr *left, Ast_Expr *right, Token *op){
 function Ast_Compound *
 ast_expr_compound(Token *pos, Ast_Expr *typespec, Array<Ast_Compound_Item *> exprs){
   AST_NEW(Compound, COMPOUND, pos);
+  result->flags = AST_EXPR;
   result->typespec = typespec;
   result->exprs = exprs.tight_copy(pctx->perm);
   if(result->typespec) result->typespec->parent = result;
@@ -284,6 +297,7 @@ ast_expr_compound(Token *pos, Ast_Expr *typespec, Array<Ast_Compound_Item *> exp
 function Ast_Compound_Item *
 ast_expr_compound_item(Token *pos, Ast_Expr *index, Ast_Atom *name, Ast_Expr *item){
   AST_NEW(Compound_Item, COMPOUND_ITEM, pos);
+  result->flags = AST_EXPR;
   result->name  = name;
   result->index = index;
   result->item  = item;
@@ -296,6 +310,7 @@ ast_expr_compound_item(Token *pos, Ast_Expr *index, Ast_Atom *name, Ast_Expr *it
 function Ast_Expr *
 ast_expr_cast(Token *pos, Ast_Expr *expr, Ast_Expr *typespec){
   AST_NEW(Cast, CAST, pos);
+  result->flags = AST_EXPR;
   result->expr     = expr;
   result->typespec = typespec;
   expr->parent = result;
@@ -306,6 +321,7 @@ ast_expr_cast(Token *pos, Ast_Expr *expr, Ast_Expr *typespec){
 function Ast_Expr *
 ast_expr_unary(Token *pos, Token_Kind op, Ast_Expr *expr){
   AST_NEW(Unary, UNARY, pos);
+  result->flags = AST_EXPR;
   result->expr = expr;
   result->op   = op;
   expr->parent = result;
@@ -315,6 +331,7 @@ ast_expr_unary(Token *pos, Token_Kind op, Ast_Expr *expr){
 function Ast_Expr *
 ast_expr_index(Token *pos, Ast_Expr *expr, Ast_Expr *index){
   AST_NEW(Index, INDEX, pos);
+  result->flags = AST_EXPR;
   result->expr = expr;
   result->index = index;
   expr->parent = result;
@@ -325,6 +342,7 @@ ast_expr_index(Token *pos, Ast_Expr *expr, Ast_Expr *index){
 function Ast_Lambda *
 ast_lambda(Token *pos, Array<Ast_Lambda_Arg *> params, Ast_Expr *ret, Ast_Block *block){
   AST_NEW(Lambda, LAMBDA, pos);
+  result->flags = AST_EXPR;
   result->args  = params.tight_copy(pctx->perm);
   result->block = block;
   result->ret   = ret;
@@ -339,6 +357,7 @@ ast_lambda(Token *pos, Array<Ast_Lambda_Arg *> params, Ast_Expr *ret, Ast_Block
 function Ast_Lambda_Arg *
 ast_expr_lambda_arg(Token *pos, Intern_String name, Ast_Expr *typespec){
   AST_NEW(Lambda_Arg, LAMBDA_ARG, pos);
+  result->flags = AST_EXPR;
   result->name = name;
   result->typespec = typespec;
   result->typespec->parent = result;
@@ -387,11 +406,23 @@ ast_init(Token *pos, Token_Kind op, Ast_Atom *ident, Ast_Expr *expr){
 function Ast_Array *
 ast_array(Token *pos, Ast_Expr *expr){
   AST_NEW(Array, ARRAY, pos);
+  result->flags = AST_EXPR;
   result->expr = expr;
   result->expr->parent = result;
   return result;
 }
 
+function Ast_Struct *
+ast_struct(Token *pos, Array<Ast *> members){
+  AST_NEW(Struct, STRUCT, pos);
+  result->members = members.tight_copy(pctx->perm);
+  For(result->members) {
+    assert(it[0]->kind == AST_VAR || it[0]->kind == AST_CONST || it[0]->kind == AST_STRUCT);
+    it[0]->parent = result;
+  }
+  return result;
+}
+
 //-----------------------------------------------------------------------------
 // Declarations
 //-----------------------------------------------------------------------------
@@ -407,11 +438,13 @@ ast_var(Token *pos, Ast_Expr *typespec, Intern_String name, Ast_Expr *expr){
 }
 
 function Ast_Const *
-ast_const(Token *pos, Intern_String name, Ast_Expr *expr){
+ast_const(Token *pos, Intern_String name, Ast *value){
   AST_NEW(Const, CONST, pos);
-  result->expr = expr;
+
+  assert(value->kind == AST_STRUCT || is_flag_set(value->flags, AST_EXPR));
+  result->value = value;
   result->name = name;
-  result->expr->parent = result;
+  result->value->parent = result;
   return result;
 }
 

new_parse.cpp

@@ -281,9 +281,9 @@ parse_lambda(Token *token, B32 is_typespec = false){
 function Ast_Expr *
 null_denotation(Token *token){
   switch(token->kind){
-    case TK_StringLit  : return ast_str(token, token->intern_val);
-    case TK_Identifier : return ast_ident(token, token->intern_val);
-    case TK_Integer    : return ast_int(token, token->int_val);
+    case TK_StringLit  : return ast_str(token, token->intern_val, AST_EXPR);
+    case TK_Identifier : return ast_ident(token, token->intern_val, AST_EXPR);
+    case TK_Integer    : return ast_int(token, token->int_val, AST_EXPR);
     case TK_Pointer    : return ast_expr_unary(token, TK_Pointer, parse_expr());
     case TK_Dereference: return ast_expr_unary(token, TK_Dereference, parse_expr());
     case TK_OpenBracket: {
@@ -386,6 +386,23 @@ parse_assign_expr(){
   return result;
 }
 
+function Ast_Struct *
+parse_struct(Token *pos){
+  Scratch scratch;
+  Array<Ast *> members = {scratch};
+
+  token_match(OPEN_SCOPE);
+  do{
+    Token *token = token_get();
+    Ast_Named *named = parse_named(false);
+    if(!named) parsing_error(token, "Failed to parse struct member");
+  }while(token_match(SAME_SCOPE));
+  token_expect(CLOSE_SCOPE);
+
+  Ast_Struct *result = ast_struct(pos, members);
+  return result;
+}
+
 function Ast_Named *
 parse_named(B32 is_global){
   Ast_Named *result = 0;
@@ -393,10 +410,24 @@ parse_named(B32 is_global){
   if(token_is(TK_Identifier)){
     if(is_global && pctx->indent != 0) parsing_error(token_get(), "Top level declarations shouldn't be indented");
     Token *name = token_next();
-    if(token_match(TK_DoubleColon)){ // Constant
-      Ast_Expr *expr = parse_expr();
-      result = ast_const(name, name->intern_val, expr);
+
+    // @note: parse constant
+    if(token_match(TK_DoubleColon)){
+      // parse struct binding
+      Token *struct_pos = token_get();
+      if(token_match_keyword(keyword_struct)){
+        Ast_Struct *struct_val = parse_struct(struct_pos);
+        result = ast_const(name, name->intern_val, struct_val);
+      }
+
+      // parse constant expression
+      else{
+        Ast_Expr *expr = parse_expr();
+        result = ast_const(name, name->intern_val, expr);
+      }
     }
+
+    // @note: parse variable
     else if(token_match(TK_Colon)){
       Ast_Expr *typespec = 0;
       Ast_Expr *expr     = 0;

new_resolve.cpp

@@ -504,7 +504,7 @@ eval_decl(Ast *ast, Sym *sym){
     }
 
     Ast_Begin(AST_CONST, Ast_Const){
-      Operand expr = eval_expr(node->expr, 0, sym);
+      Operand expr = eval_expr((Ast_Expr *)node->value, 0, sym);
       if(!expr.type) parsing_error(node->pos, "Constant value without expression");
       if(!expr.is_const) parsing_error(node->pos, "Value of constant variable is not a constant expression");
       return expr;
@@ -519,8 +519,8 @@ function Ast_Lambda *
 ast_get_lambda(Ast *ast){
   if(ast->kind == AST_CONST){
     auto ast_const = (Ast_Const *)ast;
-    if(ast_const->expr){
-      auto ast_expr = ast_const->expr;
+    if(ast_const->value){
+      auto ast_expr = ast_const->value;
       if(ast_expr->kind == AST_LAMBDA){
         return (Ast_Lambda *)ast_expr;
       }

order_independent_globals.kl

@@ -13,6 +13,8 @@ unifying the call expression and compound expression
 seems more unified and better for coherence
 but more abigous and probably harder to implement
 
+value :: call((thing: int): int thing += 1; return thing, )
+
 
 */