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implemented labels and goto parsing

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Lorenzo Torres 2025-12-01 21:05:06 +01:00
parent 1be3bf0659
commit 1ca6f024ee
7 changed files with 71 additions and 17 deletions
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34
parser.c
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@ -66,8 +66,7 @@ static void parser_sync(parser *p)
case TOKEN_STRUCT:
case TOKEN_ENUM:
case TOKEN_IF:
case TOKEN_WHILE:
case TOKEN_FOR:
case TOKEN_LOOP:
case TOKEN_DO:
case TOKEN_RETURN:
case TOKEN_SWITCH:
@ -380,7 +379,7 @@ static ast_node *parse_statement(parser *p)
{
if (match(p, TOKEN_BREAK)) {
if (!match(p, TOKEN_SEMICOLON)) {
error(p, "expected `;`.");
error(p, "expected `;` after `break`.");
return NULL;
}
ast_node *node = arena_alloc(p->allocator, sizeof(ast_node));
@ -390,7 +389,7 @@ static ast_node *parse_statement(parser *p)
ast_node *expr = parse_expression(p);
if (!expr) {
error(p, "expected expression.");
error(p, "expected expression after `return`.");
return NULL;
}
if (!match(p, TOKEN_SEMICOLON)) {
@ -402,13 +401,38 @@ static ast_node *parse_statement(parser *p)
node->type = NODE_RETURN;
node->expr.ret.value = expr;
return node;
} else if (match_peek(p, TOKEN_IDENTIFIER) && p->tokens->next && p->tokens->next->type == TOKEN_COLON) {
/* In this case, this is a label. */
ast_node *node = arena_alloc(p->allocator, sizeof(ast_node));
node->type = NODE_LABEL;
node->expr.label.name = p->tokens->lexeme;
node->expr.label.name_len = p->tokens->lexeme_len;
advance(p);
/* Consume `:` */
advance(p);
return node;
} else if (match(p, TOKEN_GOTO)) {
if (!match_peek(p, TOKEN_IDENTIFIER)) {
error(p, "expected label identifier after `goto`.");
return NULL;
}
ast_node *node = arena_alloc(p->allocator, sizeof(ast_node));
node->type = NODE_GOTO;
node->expr.label.name = p->tokens->lexeme;
node->expr.label.name_len = p->tokens->lexeme_len;
advance(p);
if (!match(p, TOKEN_SEMICOLON)) {
error(p, "expected `;` after `goto`.");
return NULL;
}
return node;
} else {
ast_node *expr = parse_expression(p);
if (!expr) {
return NULL;
}
if (!match(p, TOKEN_SEMICOLON)) {
error(p, "expected `;`.");
error(p, "expected `;` after expression.");
return NULL;
}
return expr;