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- """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:
- # this is a continuation of a previous parseLinkTitle call on the next line,
- # used in reference links only
- 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 opening marker is "(", switch it to closing marker ")"
- 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
- # no closing marker found, but this link title may continue on the next line (for references)
- state.can_continue = True
- state.str += unescapeAll(string[start:pos])
- return state
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