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Issue #1279 - Implement regular expressions lookbehind (v3)

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Based on d10e8a5b with the addition of chromium issue 570241.
This commit is contained in:
Moonchild 2022-12-21 18:53:25 +01:00 • committed by roytam1
commit 4db6fa8360
1 changed files with 4 additions and 1 deletions
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5
js/src/irregexp/RegExpEngine.cpp
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@ -4860,6 +4860,9 @@ TextNode::GetQuickCheckDetails(QuickCheckDetails* details,
int characters_filled_in,
bool not_at_start)
{
// Do not collect any quick check details if the text node reads backward,
// since it reads in the opposite direction than we use for quick checks.
if (read_backward()) return;
MOZ_ASSERT(characters_filled_in < details->characters());
int characters = details->characters();
int char_mask = MaximumCharacter(compiler->ascii());
@ -5016,7 +5019,7 @@ QuickCheckDetails::Clear()
void
QuickCheckDetails::Advance(int by, bool ascii)
{
if (by >= characters_) {
if (by >= characters_ || by < 0) {
Clear();
return;
}