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Add extra error handling for parsing slices

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gingerBill
2019-07-09 11:18:50 +01:00
parent 927d6814f2
commit 308300c1fc
2 changed files with 30 additions and 10 deletions
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28
src/parser.cpp
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@@ -2245,31 +2245,43 @@ Ast *parse_atom_expr(AstFile *f, Ast *operand, bool lhs) {
Token open = {}, close = {}, interval = {};
Ast *indices[2] = {};
Token ellipsis = {};
bool is_ellipsis = false;
bool is_interval = false;
f->expr_level++;
open = expect_token(f, Token_OpenBracket);
if (f->curr_token.kind != Token_Colon) {
switch (f->curr_token.kind) {
case Token_Ellipsis:
case Token_RangeHalf:
// NOTE(bill): Do not err yet
case Token_Colon:
break;
default:
indices[0] = parse_expr(f, false);
break;
}
if (f->curr_token.kind == Token_Colon) {
ellipsis = advance_token(f);
is_ellipsis = true;
switch (f->curr_token.kind) {
case Token_Ellipsis:
case Token_RangeHalf:
syntax_error(f->curr_token, "Expected a colon, not a range");
/* fallthrough */
case Token_Colon:
interval = advance_token(f);
is_interval = true;
if (f->curr_token.kind != Token_CloseBracket &&
f->curr_token.kind != Token_EOF) {
indices[1] = parse_expr(f, false);
}
break;
}
f->expr_level--;
close = expect_token(f, Token_CloseBracket);
if (is_ellipsis) {
operand = ast_slice_expr(f, operand, open, close, ellipsis, indices[0], indices[1]);
if (is_interval) {
operand = ast_slice_expr(f, operand, open, close, interval, indices[0], indices[1]);
} else {
operand = ast_index_expr(f, operand, indices[0], open, close);
}