def _translate_glob_part()

in setupbase.py [0:0]

• 33 lines of code
• 15 McCabe index (conditional complexity)

def _translate_glob_part(pat):
    """Translate a glob PATTERN PART to a regular expression."""
    # Code modified from Python 3 standard lib fnmatch:
    if pat == "**":
        return ".*"
    i, n = 0, len(pat)
    res = []
    while i < n:
        c = pat[i]
        i = i + 1
        if c == "*":
            # Match anything but path separators:
            res.append("[^%s]*" % SEPARATORS)
        elif c == "?":
            res.append("[^%s]?" % SEPARATORS)
        elif c == "[":
            j = i
            if j < n and pat[j] == "!":
                j = j + 1
            if j < n and pat[j] == "]":
                j = j + 1
            while j < n and pat[j] != "]":
                j = j + 1
            if j >= n:
                res.append("\\[")
            else:
                stuff = pat[i:j].replace("\\", "\\\\")
                i = j + 1
                if stuff[0] == "!":
                    stuff = "^" + stuff[1:]
                elif stuff[0] == "^":
                    stuff = "\\" + stuff
                res.append("[%s]" % stuff)
        else:
            res.append(re.escape(c))
    return "".join(res)