Function search_reverse

Lib/idlelib/searchengine.py:189–210

Search backwards and return an re match object or None. This is done by searching forwards until there is no match. Prog: compiled re object with a search method returning a match. Chars: line of text, without \\n. Col: stop index for the search; the limit for match.end().

(prog, chars, col)

def search_reverse(prog, chars, col):
    '''Search backwards and return an re match object or None.

    This is done by searching forwards until there is no match.
    Prog: compiled re object with a search method returning a match.
    Chars: line of text, without \\n.
    Col: stop index for the search; the limit for match.end().
    '''
    m = prog.search(chars)
    if not m:
        return None
    found = None
    i, j = m.span()  # m.start(), m.end() == match slice indexes
    while i < col and j <= col:
        found = m
        if i == j:
            j = j+1
        m = prog.search(chars, j)
        if not m:
            break
        i, j = m.span()
    return found

def get_selection(text):
    '''Return tuple of 'line.col&#x27; indexes from selection or insert mark.