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Add an API for getting a node's child index

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This commit is contained in:
Max Brunsfeld 2018-01-09 12:33:51 -08:00
parent f653f2b3bb
commit 315dff3285
3 changed files with 32 additions and 0 deletions
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19
src/runtime/node.c
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@ -329,6 +329,25 @@ TSNode ts_node_parent(TSNode self) {
return result;
}
uint32_t ts_node_child_index(TSNode self) {
const Tree *tree = ts_node__tree(self);
uint32_t result = 0;
for (;;) {
const Tree *parent = tree->context.parent;
uint32_t index = tree->context.index;
if (!parent) return UINT32_MAX;
for (uint32_t i = 0; i < index; i++) {
Tree *child = parent->children[i];
result += child->visible ? 1 : child->visible_child_count;
}
if (parent->visible) break;
tree = parent;
}
return result;
}
TSNode ts_node_child(TSNode self, uint32_t child_index) {
return ts_node__child(self, child_index, true);
}