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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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