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fix zero width repeat

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This commit is contained in:
Kangzhi Shi
2021-01-20 16:33:30 +02:00
parent 97000fc4e0
commit 84113cba2c
1 changed files with 18 additions and 3 deletions
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21
interp.rs
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@@ -1245,6 +1245,7 @@ struct OpMinUntil {
jump_id: usize,
count: isize,
save_repeat: Option<RepeatContext>,
save_last_position: usize,
}
impl OpcodeExecutor for OpMinUntil {
fn next(&mut self, drive: &mut StackDrive) -> Option<()> {
@@ -1280,6 +1281,7 @@ impl OpcodeExecutor for OpMinUntil {
drive.ctx_mut().has_matched = child_ctx.has_matched;
if drive.ctx().has_matched != Some(true) {
drive.repeat_ctx_mut().count = self.count - 1;
drive.repeat_ctx_mut().last_position = self.save_last_position;
drive.state.string_position = drive.ctx().string_position;
}
None
@@ -1295,13 +1297,26 @@ impl OpcodeExecutor for OpMinUntil {
drive.state.marks_pop();
// match more unital tail matches
let maxcount = drive.repeat_ctx().maxcount;
let code_position = drive.repeat_ctx().code_position;
if self.count as usize >= maxcount && maxcount != MAXREPEAT {
let RepeatContext {
count: _,
code_position,
last_position,
mincount: _,
maxcount,
} = *drive.repeat_ctx();
if self.count as usize >= maxcount && maxcount != MAXREPEAT
|| drive.state.string_position == last_position
{
drive.ctx_mut().has_matched = Some(false);
return None;
}
drive.repeat_ctx_mut().count = self.count;
/* zero-width match protection */
self.save_last_position = last_position;
drive.repeat_ctx_mut().last_position = drive.state.string_position;
drive.push_new_context_at(code_position + 4);
self.jump_id = 1;
Some(())