87 lines
1.9 KiB
Python
87 lines
1.9 KiB
Python
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"""
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Parse link destination
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"""
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from ..common.utils import charCodeAt, unescapeAll
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class _Result:
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__slots__ = ("ok", "pos", "lines", "str")
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def __init__(self) -> None:
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self.ok = False
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self.pos = 0
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self.lines = 0
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self.str = ""
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def parseLinkDestination(string: str, pos: int, maximum: int) -> _Result:
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lines = 0
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start = pos
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result = _Result()
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if charCodeAt(string, pos) == 0x3C: # /* < */
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pos += 1
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while pos < maximum:
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code = charCodeAt(string, pos)
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if code == 0x0A: # /* \n */)
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return result
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if code == 0x3C: # / * < * /
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return result
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if code == 0x3E: # /* > */) {
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result.pos = pos + 1
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result.str = unescapeAll(string[start + 1 : pos])
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result.ok = True
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return result
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if code == 0x5C and pos + 1 < maximum: # \
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pos += 2
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continue
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pos += 1
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# no closing '>'
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return result
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# this should be ... } else { ... branch
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level = 0
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while pos < maximum:
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code = charCodeAt(string, pos)
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if code is None or code == 0x20:
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break
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# ascii control characters
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if code < 0x20 or code == 0x7F:
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break
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if code == 0x5C and pos + 1 < maximum:
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if charCodeAt(string, pos + 1) == 0x20:
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break
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pos += 2
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continue
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if code == 0x28: # /* ( */)
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level += 1
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if level > 32:
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return result
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if code == 0x29: # /* ) */)
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if level == 0:
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break
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level -= 1
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pos += 1
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if start == pos:
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return result
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if level != 0:
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return result
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result.str = unescapeAll(string[start:pos])
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result.lines = lines
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result.pos = pos
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result.ok = True
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return result
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