Add if statements

new_ast.cpp

@@ -89,6 +89,8 @@ enum Ast_Kind{
   AST_COMPOUND_ITEM,
   AST_COMPOUND,
 
+  AST_IF,
+  AST_IF_NODE,
   AST_RETURN,
   AST_BLOCK,
   AST_LAMBDA,
@@ -104,8 +106,12 @@ enum Ast_Kind{
 
 struct Ast{
   U64 id;
-  Ast_Kind kind;
   Token *pos;
+
+  Ast_Kind kind;
+  bool is_stmt: 1;
+  bool is_expr: 1;
+  bool is_decl: 1;
 };
 
 struct Ast_Resolved_Type;
@@ -161,6 +167,15 @@ struct Ast_Return: Ast{
   Ast_Expr *expr;
 };
 
+struct Ast_If_Node: Ast{
+  Ast_Expr  *expr ;
+  Ast_Block *block;
+};
+
+struct Ast_If: Ast{
+  Array<Ast_If_Node *> ifs;
+};
+
 struct Ast_Lambda_Arg: Ast_Expr{
   Intern_String name;
   Ast_Typespec *typespec;
@@ -315,6 +330,21 @@ ast_block(Token *pos, Array<Ast *> stmts){
   return result;
 }
 
+function Ast_If *
+ast_if(Token *pos, Array<Ast_If_Node *> ifs){
+  AST_NEW(If, AST_IF, pos);
+  result->ifs = ifs.tight_copy(pctx->perm);
+  return result;
+}
+
+function Ast_If_Node *
+ast_if_node(Token *pos, Ast_Expr *expr, Ast_Block *block){
+  AST_NEW(If_Node, AST_IF_NODE, pos);
+  result->block = block;
+  result->expr  = expr;
+  return result;
+}
+
 //-----------------------------------------------------------------------------
 // Typespecs
 //-----------------------------------------------------------------------------