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"""
Parse link destination
"""
from ..common.utils import charCodeAt, unescapeAll
class _Result:
__slots__ = ("ok", "pos", "lines", "str")
def __init__(self):
self.ok = False
self.pos = 0
self.lines = 0
self.str = ""
def parseLinkDestination(string: str, pos: int, maximum: int) -> _Result:
lines = 0
start = pos
result = _Result()
if charCodeAt(string, pos) == 0x3C: # /* < */
pos += 1
while pos < maximum:
code = charCodeAt(string, pos)
if code == 0x0A: # /* \n */)
return result
if code == 0x3C: # / * < * /
return result
if code == 0x3E: # /* > */) {
result.pos = pos + 1
result.str = unescapeAll(string[start + 1 : pos])
result.ok = True
return result
if code == 0x5C and pos + 1 < maximum: # \
pos += 2
continue
pos += 1
# no closing '>'
return result
# this should be ... } else { ... branch
level = 0
while pos < maximum:
code = charCodeAt(string, pos)
if code == 0x20:
break
# ascii control characters
if code < 0x20 or code == 0x7F:
break
if code == 0x5C and pos + 1 < maximum:
if charCodeAt(string, pos + 1) == 0x20:
break
pos += 2
continue
if code == 0x28: # /* ( */)
level += 1
if level > 32:
return result
if code == 0x29: # /* ) */)
if level == 0:
break
level -= 1
pos += 1
if start == pos:
return result
if level != 0:
return result
result.str = unescapeAll(string[start:pos])
result.lines = lines
result.pos = pos
result.ok = True
return result