| """Parse link title""" |
|
|
| from ..common.utils import charCodeAt, unescapeAll |
|
|
|
|
| class _State: |
| __slots__ = ("can_continue", "marker", "ok", "pos", "str") |
|
|
| def __init__(self) -> None: |
| self.ok = False |
| """if `true`, this is a valid link title""" |
| self.can_continue = False |
| """if `true`, this link can be continued on the next line""" |
| self.pos = 0 |
| """if `ok`, it's the position of the first character after the closing marker""" |
| self.str = "" |
| """if `ok`, it's the unescaped title""" |
| self.marker = 0 |
| """expected closing marker character code""" |
|
|
| def __str__(self) -> str: |
| return self.str |
|
|
|
|
| def parseLinkTitle( |
| string: str, start: int, maximum: int, prev_state: _State | None = None |
| ) -> _State: |
| """Parse link title within `str` in [start, max] range, |
| or continue previous parsing if `prev_state` is defined (equal to result of last execution). |
| """ |
| pos = start |
| state = _State() |
|
|
| if prev_state is not None: |
| |
| |
| state.str = prev_state.str |
| state.marker = prev_state.marker |
| else: |
| if pos >= maximum: |
| return state |
|
|
| marker = charCodeAt(string, pos) |
|
|
| |
| if marker != 0x22 and marker != 0x27 and marker != 0x28: |
| return state |
|
|
| start += 1 |
| pos += 1 |
|
|
| |
| if marker == 0x28: |
| marker = 0x29 |
|
|
| state.marker = marker |
|
|
| while pos < maximum: |
| code = charCodeAt(string, pos) |
| if code == state.marker: |
| state.pos = pos + 1 |
| state.str += unescapeAll(string[start:pos]) |
| state.ok = True |
| return state |
| elif code == 0x28 and state.marker == 0x29: |
| return state |
| elif code == 0x5C and pos + 1 < maximum: |
| pos += 1 |
|
|
| pos += 1 |
|
|
| |
| state.can_continue = True |
| state.str += unescapeAll(string[start:pos]) |
| return state |
|
|
