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fix(lib): account for unreachable patterns with children

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Co-authored-by: Will Lillis <will.lillis24@gmail.com>
This commit is contained in:
Amaan Qureshi 2025-09-23 03:38:16 -04:00 • committed by Amaan Qureshi
parent f26bd44a43
commit 90ee433c9b
2 changed files with 65 additions and 2 deletions
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9
lib/src/query.c
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@ -1759,8 +1759,13 @@ static bool ts_query__analyze_patterns(TSQuery *self, unsigned *error_offset) {
// If this pattern cannot match, store the pattern index so that it can be
// returned to the caller.
if (analysis.finished_parent_symbols.size == 0) {
ts_assert(analysis.final_step_indices.size > 0);
uint16_t impossible_step_index = *array_back(&analysis.final_step_indices);
uint16_t impossible_step_index;
if (analysis.final_step_indices.size > 0) {
impossible_step_index = *array_back(&analysis.final_step_indices);
} else {
// If there isn't a final step, then that means the parent step itself is unreachable.
impossible_step_index = parent_step_index;
}
uint32_t j, impossible_exists;
array_search_sorted_by(&self->step_offsets, .step_index, impossible_step_index, &j, &impossible_exists);
if (j >= self->step_offsets.size) j = self->step_offsets.size - 1;