def _glob2re()

in src/buildstream/utils.py [0:0]

• 35 lines of code
• 17 McCabe index (conditional complexity)

def _glob2re(pat):
    i, n = 0, len(pat)
    res = ""
    while i < n:
        c = pat[i]
        i = i + 1
        if c == "*":
            # fnmatch.translate() simply uses the '.*' separator here,
            # we only want that for double asterisk (bash 'globstar' behavior)
            #
            if i < n and pat[i] == "*":
                res = res + ".*"
                i = i + 1
            else:
                res = res + "[^/]*"
        elif c == "?":
            # fnmatch.translate() simply uses the '.' wildcard here, but
            # we dont want to match path separators here
            res = res + "[^/]"
        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 = res + "\\["
            else:
                stuff = pat[i:j].replace("\\", "\\\\")
                i = j + 1
                if stuff[0] == "!":
                    stuff = "^" + stuff[1:]
                elif stuff[0] == "^":
                    stuff = "\\" + stuff
                res = "{}[{}]".format(res, stuff)
        else:
            res = res + re.escape(c)
    return res + r"\Z"