codekingpro/portable-devtools

1"""Parse link title"""2 3from ..common.utils import charCodeAt, unescapeAll4 5 6class _State:7    __slots__ = ("can_continue", "marker", "ok", "pos", "str")8 9    def __init__(self) -> None:10        self.ok = False11        """if `true`, this is a valid link title"""12        self.can_continue = False13        """if `true`, this link can be continued on the next line"""14        self.pos = 015        """if `ok`, it's the position of the first character after the closing marker"""16        self.str = ""17        """if `ok`, it's the unescaped title"""18        self.marker = 019        """expected closing marker character code"""20 21    def __str__(self) -> str:22        return self.str23 24 25def parseLinkTitle(26    string: str, start: int, maximum: int, prev_state: _State | None = None27) -> _State:28    """Parse link title within `str` in [start, max] range,29    or continue previous parsing if `prev_state` is defined (equal to result of last execution).30    """31    pos = start32    state = _State()33 34    if prev_state is not None:35        # this is a continuation of a previous parseLinkTitle call on the next line,36        # used in reference links only37        state.str = prev_state.str38        state.marker = prev_state.marker39    else:40        if pos >= maximum:41            return state42 43        marker = charCodeAt(string, pos)44 45        # /* " */  /* ' */  /* ( */46        if marker != 0x22 and marker != 0x27 and marker != 0x28:47            return state48 49        start += 150        pos += 151 52        # if opening marker is "(", switch it to closing marker ")"53        if marker == 0x28:54            marker = 0x2955 56        state.marker = marker57 58    while pos < maximum:59        code = charCodeAt(string, pos)60        if code == state.marker:61            state.pos = pos + 162            state.str += unescapeAll(string[start:pos])63            state.ok = True64            return state65        elif code == 0x28 and state.marker == 0x29:  # /* ( */  /* ) */66            return state67        elif code == 0x5C and pos + 1 < maximum:  # /* \ */68            pos += 169 70        pos += 171 72    # no closing marker found, but this link title may continue on the next line (for references)73    state.can_continue = True74    state.str += unescapeAll(string[start:pos])75    return state76