95 lines
3.4 KiB
Python
95 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright(C) 2010-2011 Christophe Benz
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#
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# This file is part of weboob.
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#
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# weboob is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# weboob is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with weboob. If not, see <http://www.gnu.org/licenses/>.
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import re
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import lxml.html
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from .iparser import IParser
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from ..browser import BrokenPageError
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__all__ = ['LxmlHtmlParser']
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class LxmlHtmlParser(IParser):
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"""
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Parser using lxml.
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Note that it is not available on every systems.
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"""
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def parse(self, data, encoding=None):
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if encoding is None:
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parser = None
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else:
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parser = lxml.html.HTMLParser(encoding=encoding)
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return lxml.html.parse(data, parser)
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def tostring(self, element):
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return lxml.html.tostring(element, encoding=unicode)
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def tocleanstring(self, element):
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txt = element.xpath('text()') # ['foo ', ' bar']
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txt = ' '.join(txt) # 'foo bar'
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txt = re.sub('\s+', ' ', txt) # 'foo bar'
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return txt.strip()
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def strip(self, s):
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doc = lxml.html.fromstring(s) # parse html string
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return self.tocleanstring(doc)
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@classmethod
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def select(cls, element, selector, nb=None, method='cssselect'):
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"""
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Select one or many elements from an element, using lxml cssselect by default.
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Raises BrokenPageError if not found.
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@param element [obj] element on which to apply selector
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@param selector [str] CSS or XPath expression
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@param method [str] (cssselect|xpath)
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@param nb [int] number of elements expected to be found.
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Use None for undefined number, and 'many' for 1 to infinite.
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@return one or many Element
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"""
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if method == 'cssselect':
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results = element.cssselect(selector)
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elif method == 'xpath':
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results = element.xpath(selector)
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else:
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raise NotImplementedError('Only the cssselect and xpath methods are supported')
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if nb is None:
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return results
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elif isinstance(nb, basestring) and nb == 'many':
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if results is None or len(results) == 0:
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raise BrokenPageError('Element not found with selector "%s"' % selector)
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elif len(results) == 1:
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raise BrokenPageError('Only one element found with selector "%s"' % selector)
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else:
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return results
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elif isinstance(nb, int) and nb > 0:
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if results is None:
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raise BrokenPageError('Element not found with selector "%s"' % selector)
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elif len(results) < nb:
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raise BrokenPageError('Not enough elements found (%d expected) with selector "%s"' % (nb, selector))
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else:
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return results[0] if nb == 1 else results
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else:
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raise Exception('Unhandled value for kwarg "nb": %s' % nb)
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