text_objects.py 文件源码

def find_prev_lone_bracket(view, start, tags, unbalanced=0):
    # TODO: Extract common functionality from here and the % motion instead of
    # duplicating code.

    # XXX: refactor this
    if view.substr(start) == tags[0][1] if len(tags[0]) > 1 else tags[0]:
        if not unbalanced and view.substr(start - 1) != '\\':
            return sublime.Region(start, start + 1)

    new_start = start
    for i in range(unbalanced or 1):
        prev_opening_bracket = reverse_search_by_pt(view, tags[0],
                                                  start=0,
                                                  end=new_start,
                                                  flags=sublime.IGNORECASE)

        if prev_opening_bracket is None:
            # Check whether the caret is exactly at a bracket.
            # Tag names may be escaped, so slice them.
            if (i == 0 and view.substr(start) == tags[0][-1] and
               view.substr(start - 1) != '\\'):
                    return sublime.Region(start, start + 1)
            # Unbalanced tags; nothing we can do.
            return

        while view.substr(prev_opening_bracket.begin() - 1) == '\\':
            prev_opening_bracket = reverse_search_by_pt(
                                          view, tags[0],
                                          start=0,
                                          end=prev_opening_bracket.begin(),
                                          flags=sublime.IGNORECASE)
            if prev_opening_bracket is None:
                return

        new_start = prev_opening_bracket.begin()

    nested = 0
    while True:
        next_closing_bracket = reverse_search_by_pt(view, tags[1],
                                              start=prev_opening_bracket.a,
                                              end=start,
                                              flags=sublime.IGNORECASE)
        if not next_closing_bracket:
            break
        nested += 1
        start = next_closing_bracket.begin()

    if nested > 0:
        return find_prev_lone_bracket(view, prev_opening_bracket.begin(),
                                                  tags,
                                                  nested)
    else:
        return prev_opening_bracket