sre_compile.py 文件源码

def _compile_charset(charset, flags, code, fixup=None):
    # compile charset subprogram
    emit = code.append
    if fixup is None:
        fixup = _identityfunction
    for op, av in _optimize_charset(charset, fixup):
        emit(OPCODES[op])
        if op is NEGATE:
            pass
        elif op is LITERAL:
            emit(fixup(av))
        elif op is RANGE:
            emit(fixup(av[0]))
            emit(fixup(av[1]))
        elif op is CHARSET:
            code.extend(av)
        elif op is BIGCHARSET:
            code.extend(av)
        elif op is CATEGORY:
            if flags & SRE_FLAG_LOCALE:
                emit(CHCODES[CH_LOCALE[av]])
            elif flags & SRE_FLAG_UNICODE:
                emit(CHCODES[CH_UNICODE[av]])
            else:
                emit(CHCODES[av])
        else:
            raise error, "internal: unsupported set operator"
    emit(OPCODES[FAILURE])