| """ |
| Parse link destination |
| """ |
| |
| from ..common.utils import unescapeAll, charCodeAt |
| |
| |
| 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 |
