60 lines
1.6 KiB
Python
60 lines
1.6 KiB
Python
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import logging
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from django.utils.safestring import SafeData, mark_safe
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from lxml import html
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from lxml.etree import ParserError, XMLSyntaxError
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logger = logging.getLogger('judge.html')
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class HTMLTreeString(SafeData):
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def __init__(self, str):
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try:
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self._tree = html.fromstring(str, parser=html.HTMLParser(recover=True))
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except (XMLSyntaxError, ParserError) as e:
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if str and (not isinstance(e, ParserError) or e.args[0] != 'Document is empty'):
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logger.exception('Failed to parse HTML string')
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self._tree = html.Element('div')
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def __getattr__(self, attr):
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try:
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return getattr(self._tree, attr)
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except AttributeError:
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return getattr(str(self), attr)
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def __setattr__(self, key, value):
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if key[0] == '_':
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super(HTMLTreeString, self).__setattr__(key, value)
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setattr(self._tree, key, value)
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def __repr__(self):
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return '<HTMLTreeString %r>' % str(self)
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def __str__(self):
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return mark_safe(html.tostring(self._tree, encoding='unicode'))
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def __radd__(self, other):
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return other + str(self)
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def __add__(self, other):
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return str(self) + other
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def __getitem__(self, item):
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return str(self)[item]
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def __getstate__(self):
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return str(self)
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def __setstate__(self, state):
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self._tree = html.fromstring(state)
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@property
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def tree(self):
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return self._tree
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def fromstring(str):
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if isinstance(str, HTMLTreeString):
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return str
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return HTMLTreeString(str)
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