Method __init__

Lib/re/__init__.py:394–413

(self, lexicon, flags=0)

class Scanner:
    def __init__(self, lexicon, flags=0):
        from ._constants import BRANCH, SUBPATTERN
        if isinstance(flags, RegexFlag):
            flags = flags.value
        self.lexicon = lexicon
        # combine phrases into a compound pattern
        p = []
        s = _parser.State()
        s.flags = flags
        for phrase, action in lexicon:
            sub_pattern = _parser.parse(phrase, flags)
            if sub_pattern.state.groups != 1:
                raise ValueError("Cannot use capturing groups in re.Scanner")
            gid = s.opengroup()
            p.append(_parser.SubPattern(s, [
                (SUBPATTERN, (gid, 0, 0, sub_pattern)),
                ]))
            s.closegroup(gid, p[-1])
        p = _parser.SubPattern(s, [(BRANCH, (None, p))])
        self.scanner = _compiler.compile(p)
    def scan(self, string):
        result = []
        append = result.append