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New syntax that's easier to parse, parsing doesn't need variable lookup

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This commit is contained in:
Krzosa Karol
2022-05-03 11:31:21 +02:00
parent 3c376bbe30
commit 8c04044ea2
12 changed files with 1216 additions and 244 deletions
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55
parse_expr.c
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@@ -1,5 +1,6 @@
function Expr* parse_expr(Parser* p);
function Expr* parse_list_expr(Parser* p);
function Typespec *parse_type(Parser *p);
function Expr*
parse_atom_expr(Parser* p){
@@ -10,6 +11,21 @@ parse_atom_expr(Parser* p){
token_is(p, TK_Int)){
result = expr_atom(p, token_next(p));
}
else if (token_is_keyword(p, keyword_sizeof)) {
Token *token = token_next(p);
token_expect(p, TK_OpenParen);
Typespec *type = 0;
Expr *expr = 0;
if(token_match(p, TK_Colon)) {
result = expr_sizeof_type(p, token, parse_type(p));
}
else {
result = expr_sizeof_expr(p, token, parse_expr(p));
}
token_expect(p, TK_CloseParen);
}
else if (token_match(p, TK_OpenParen)){
result = parse_list_expr(p);
token_expect(p, TK_CloseParen);
@@ -24,17 +40,13 @@ function Expr*
parse_postfix_expr(Parser* p){
Expr* result = parse_atom_expr(p);
while (token_is(p, TK_Dot)
|| token_is(p, TK_Arrow)
|| token_is(p, TK_DoubleColon)
|| token_is(p, TK_OpenParen)
|| token_is(p, TK_OpenBracket)
|| token_is(p, TK_Decrement)
|| token_is(p, TK_Increment)){
Token *op = token_get(p);
if (token_match(p, TK_Arrow)
|| token_match(p, TK_DoubleColon)
|| token_match(p, TK_Dot)){
if (token_match(p, TK_Dot)){
Expr* r = parse_atom_expr(p);
result = expr_binary(p, op, result, r);
}
@@ -85,35 +97,16 @@ Expr* parse_unary_expr(Parser* p) {
result = parse_unary_expr(p);
result = expr_unary(p, op, result);
}
else if (token_is_keyword(p, keyword_sizeof)) {
else if (token_is_keyword(p, keyword_cast)) {
Token *token = token_next(p);
token_expect(p, TK_OpenParen);
Typespec *type = parse_type(p);
token_expect(p, TK_CloseParen);
result = parse_unary_expr(p);
result = expr_unary(p, token, result);
result = expr_cast(p, token, type, result);
}
/*
else if (token_is(p, TK_OpenParen)) { // cast requires lookahead
Token *token = token_peek(p, 1);
if (token->kind == TK_Identifier) {
AST_Node *type = symbol_lookup_type(p, token->intern_val);
if(type){
token_next(p);
token_next(p);
// @Todo(Krzosa): Parse pointer types
token_expect(p, TK_CloseParen);
result = parse_unary_expr(p);
result = expr_cast(p, token, type, result);
}
else {
result = parse_postfix_expr(p);
}
}
else {
result = parse_postfix_expr(p);
}
}
*/
else {
result = parse_postfix_expr(p);
}