2011-05-03 04:34:29 +00:00
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# strip out a set of nuisance html attributes that can mess up rendering in RSS feeds
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import re
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from lxml.html.clean import Cleaner
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2011-06-01 05:16:32 +00:00
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bad_attrs = ['width', 'height', 'style', '[-a-z]*color', 'background[-a-z]*', 'on*']
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2011-05-03 04:34:29 +00:00
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single_quoted = "'[^']+'"
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double_quoted = '"[^"]+"'
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non_space = '[^ "\'>]+'
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htmlstrip = re.compile("<" # open
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"([^>]+) " # prefix
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"(?:%s) *" % ('|'.join(bad_attrs),) + # undesirable attributes
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'= *(?:%s|%s|%s)' % (non_space, single_quoted, double_quoted) + # value
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"([^>]*)" # postfix
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">" # end
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, re.I)
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def clean_attributes(html):
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while htmlstrip.search(html):
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html = htmlstrip.sub('<\\1\\2>', html)
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return html
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def normalize_spaces(s):
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if not s: return ''
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"""replace any sequence of whitespace
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characters with a single space"""
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return ' '.join(s.split())
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html_cleaner = Cleaner(scripts=True, javascript=True, comments=True,
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style=True, links=True, meta=False, add_nofollow=False,
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page_structure=False, processing_instructions=True, embedded=False,
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frames=False, forms=False, annoying_tags=False, remove_tags=None,
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remove_unknown_tags=False, safe_attrs_only=False)
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