IteratorComparison iterator_compare()

in lib/src/get_changed_ranges.c [290:322]

• 30 lines of code
• 14 McCabe index (conditional complexity)

IteratorComparison iterator_compare(const Iterator *old_iter, const Iterator *new_iter) {
  Subtree old_tree = NULL_SUBTREE;
  Subtree new_tree = NULL_SUBTREE;
  uint32_t old_start = 0;
  uint32_t new_start = 0;
  TSSymbol old_alias_symbol = 0;
  TSSymbol new_alias_symbol = 0;
  iterator_get_visible_state(old_iter, &old_tree, &old_alias_symbol, &old_start);
  iterator_get_visible_state(new_iter, &new_tree, &new_alias_symbol, &new_start);

  if (!old_tree.ptr && !new_tree.ptr) return IteratorMatches;
  if (!old_tree.ptr || !new_tree.ptr) return IteratorDiffers;

  if (
    old_alias_symbol == new_alias_symbol &&
    ts_subtree_symbol(old_tree) == ts_subtree_symbol(new_tree)
  ) {
    if (old_start == new_start &&
        !ts_subtree_has_changes(old_tree) &&
        ts_subtree_symbol(old_tree) != ts_builtin_sym_error &&
        ts_subtree_size(old_tree).bytes == ts_subtree_size(new_tree).bytes &&
        ts_subtree_parse_state(old_tree) != TS_TREE_STATE_NONE &&
        ts_subtree_parse_state(new_tree) != TS_TREE_STATE_NONE &&
        (ts_subtree_parse_state(old_tree) == ERROR_STATE) ==
        (ts_subtree_parse_state(new_tree) == ERROR_STATE)) {
      return IteratorMatches;
    } else {
      return IteratorMayDiffer;
    }
  }

  return IteratorDiffers;
}