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367 lines
14 KiB
Python
367 lines
14 KiB
Python
"""CSSImportRule implements DOM Level 2 CSS CSSImportRule plus the
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``name`` property from http://www.w3.org/TR/css3-cascade/#cascading."""
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__all__ = ['CSSImportRule']
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__docformat__ = 'restructuredtext'
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__version__ = '$Id: cssimportrule.py 1871 2009-10-17 19:57:37Z cthedot $'
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import cssrule
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import cssutils
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import os
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import urllib
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import urlparse
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import xml.dom
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class CSSImportRule(cssrule.CSSRule):
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"""
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Represents an @import rule within a CSS style sheet. The @import rule
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is used to import style rules from other style sheets.
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Format::
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import
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: IMPORT_SYM S*
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[STRING|URI] S* [ medium [ COMMA S* medium]* ]? S* STRING? S* ';' S*
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;
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"""
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def __init__(self, href=None, mediaText=u'all', name=None,
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parentRule=None, parentStyleSheet=None, readonly=False):
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"""
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if readonly allows setting of properties in constructor only
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Do not use as positional but as keyword attributes only!
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href
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location of the style sheet to be imported.
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mediaText
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A list of media types for which this style sheet may be used
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as a string
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"""
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super(CSSImportRule, self).__init__(parentRule=parentRule,
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parentStyleSheet=parentStyleSheet)
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self._atkeyword = u'@import'
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self.hreftype = None
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self._styleSheet = None
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self._href = None
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self.href = href
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self._media = cssutils.stylesheets.MediaList()
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if mediaText:
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self._media.mediaText = mediaText
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self._name = name
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seq = self._tempSeq()
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seq.append(self.href, 'href')
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seq.append(self.media, 'media')
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seq.append(self.name, 'name')
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self._setSeq(seq)
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self._readonly = readonly
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def __repr__(self):
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if self._usemedia:
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mediaText = self.media.mediaText
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else:
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mediaText = None
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return "cssutils.css.%s(href=%r, mediaText=%r, name=%r)" % (
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self.__class__.__name__,
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self.href, self.media.mediaText, self.name)
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def __str__(self):
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if self._usemedia:
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mediaText = self.media.mediaText
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else:
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mediaText = None
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return "<cssutils.css.%s object href=%r mediaText=%r name=%r at 0x%x>" % (
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self.__class__.__name__, self.href, mediaText, self.name, id(self))
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_usemedia = property(lambda self: self.media.mediaText not in (u'', u'all'),
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doc="if self._media is used (or simply empty)")
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def _getCssText(self):
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"""Return serialized property cssText."""
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return cssutils.ser.do_CSSImportRule(self)
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def _setCssText(self, cssText):
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"""
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:exceptions:
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- :exc:`~xml.dom.HierarchyRequestErr`:
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Raised if the rule cannot be inserted at this point in the
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style sheet.
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- :exc:`~xml.dom.InvalidModificationErr`:
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Raised if the specified CSS string value represents a different
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type of rule than the current one.
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- :exc:`~xml.dom.NoModificationAllowedErr`:
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Raised if the rule is readonly.
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- :exc:`~xml.dom.SyntaxErr`:
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Raised if the specified CSS string value has a syntax error and
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is unparsable.
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"""
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super(CSSImportRule, self)._setCssText(cssText)
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tokenizer = self._tokenize2(cssText)
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attoken = self._nexttoken(tokenizer, None)
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if self._type(attoken) != self._prods.IMPORT_SYM:
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self._log.error(u'CSSImportRule: No CSSImportRule found: %s' %
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self._valuestr(cssText),
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error=xml.dom.InvalidModificationErr)
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else:
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# save if parse goes wrong
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oldmedia = cssutils.stylesheets.MediaList()
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oldmedia._absorb(self.media)
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# for closures: must be a mutable
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new = {'keyword': self._tokenvalue(attoken),
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'href': None,
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'hreftype': None,
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'media': None,
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'name': None,
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'wellformed': True
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}
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def __doname(seq, token):
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# called by _string or _ident
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new['name'] = self._stringtokenvalue(token)
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seq.append(new['name'], 'name')
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return ';'
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def _string(expected, seq, token, tokenizer=None):
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if 'href' == expected:
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# href
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new['href'] = self._stringtokenvalue(token)
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new['hreftype'] = 'string'
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seq.append(new['href'], 'href')
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return 'media name ;'
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elif 'name' in expected:
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# name
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return __doname(seq, token)
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else:
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new['wellformed'] = False
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self._log.error(
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u'CSSImportRule: Unexpected string.', token)
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return expected
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def _uri(expected, seq, token, tokenizer=None):
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# href
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if 'href' == expected:
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uri = self._uritokenvalue(token)
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new['hreftype'] = 'uri'
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new['href'] = uri
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seq.append(new['href'], 'href')
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return 'media name ;'
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else:
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new['wellformed'] = False
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self._log.error(
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u'CSSImportRule: Unexpected URI.', token)
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return expected
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def _ident(expected, seq, token, tokenizer=None):
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# medialist ending with ; which is checked upon too
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if expected.startswith('media'):
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mediatokens = self._tokensupto2(
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tokenizer, importmediaqueryendonly=True)
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mediatokens.insert(0, token) # push found token
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last = mediatokens.pop() # retrieve ;
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lastval, lasttyp = self._tokenvalue(last), self._type(last)
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if lastval != u';' and lasttyp not in ('EOF', self._prods.STRING):
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new['wellformed'] = False
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self._log.error(u'CSSImportRule: No ";" found: %s' %
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self._valuestr(cssText), token=token)
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#media = cssutils.stylesheets.MediaList()
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self.media.mediaText = mediatokens
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if self.media.wellformed:
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new['media'] = self.media
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seq.append(self.media, 'media')
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else:
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# RESET
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self.media._absorb(oldmedia)
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new['wellformed'] = False
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self._log.error(u'CSSImportRule: Invalid MediaList: %s' %
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self._valuestr(cssText), token=token)
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if lasttyp == self._prods.STRING:
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# name
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return __doname(seq, last)
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else:
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return 'EOF' # ';' is token "last"
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else:
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new['wellformed'] = False
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self._log.error(
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u'CSSImportRule: Unexpected ident.', token)
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return expected
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def _char(expected, seq, token, tokenizer=None):
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# final ;
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val = self._tokenvalue(token)
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if expected.endswith(';') and u';' == val:
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return 'EOF'
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else:
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new['wellformed'] = False
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self._log.error(
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u'CSSImportRule: Unexpected char.', token)
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return expected
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# import : IMPORT_SYM S* [STRING|URI]
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# S* [ medium [ ',' S* medium]* ]? ';' S*
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# STRING? # see http://www.w3.org/TR/css3-cascade/#cascading
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# ;
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newseq = self._tempSeq()
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wellformed, expected = self._parse(expected='href',
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seq=newseq, tokenizer=tokenizer,
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productions={'STRING': _string,
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'URI': _uri,
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'IDENT': _ident,
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'CHAR': _char},
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new=new)
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# wellformed set by parse
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wellformed = wellformed and new['wellformed']
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# post conditions
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if not new['href']:
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wellformed = False
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self._log.error(u'CSSImportRule: No href found: %s' %
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self._valuestr(cssText))
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if expected != 'EOF':
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wellformed = False
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self._log.error(u'CSSImportRule: No ";" found: %s' %
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self._valuestr(cssText))
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# set all
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if wellformed:
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self.atkeyword = new['keyword']
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self.hreftype = new['hreftype']
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if not new['media']:
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# reset media to base media
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self.media.mediaText = u'all'
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newseq.append(self.media, 'media')
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self.name = new['name']
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self._setSeq(newseq)
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self.href = new['href']
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if self.styleSheet:
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# title is set by href
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#self.styleSheet._href = self.href
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self.styleSheet._parentStyleSheet = self.parentStyleSheet
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cssText = property(fget=_getCssText, fset=_setCssText,
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doc="(DOM) The parsable textual representation of this rule.")
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def _setHref(self, href):
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# update seq
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for i, item in enumerate(self.seq):
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val, typ = item.value, item.type
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if 'href' == typ:
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self._seq[i] = (href, typ, item.line, item.col)
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break
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else:
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seq = self._tempSeq()
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seq.append(self.href, 'href')
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self._setSeq(seq)
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# set new href
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self._href = href
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if not self.styleSheet:
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# set only if not set before
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self.__setStyleSheet()
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href = property(lambda self: self._href, _setHref,
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doc="Location of the style sheet to be imported.")
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media = property(lambda self: self._media,
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doc="(DOM readonly) A list of media types for this rule "
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"of type :class:`~cssutils.stylesheets.MediaList`.")
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def _setName(self, name):
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"""Raises xml.dom.SyntaxErr if name is not a string."""
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if isinstance(name, basestring) or name is None:
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# "" or ''
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if not name:
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name = None
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# update seq
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for i, item in enumerate(self.seq):
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val, typ = item.value, item.type
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if 'name' == typ:
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self._seq[i] = (name, typ, item.line, item.col)
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break
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else:
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# append
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seq = self._tempSeq()
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for item in self.seq:
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# copy current seq
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seq.append(item.value, item.type, item.line, item.col)
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seq.append(name, 'name')
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self._setSeq(seq)
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self._name = name
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# set title of referred sheet
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if self.styleSheet:
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self.styleSheet.title = name
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else:
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self._log.error(u'CSSImportRule: Not a valid name: %s' % name)
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name = property(lambda self: self._name, _setName,
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doc=u"An optional name for the imported sheet.")
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def __setStyleSheet(self):
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"""Read new CSSStyleSheet cssText from href using parentStyleSheet.href
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Indirectly called if setting ``href``. In case of any error styleSheet
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is set to ``None``.
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"""
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# should simply fail so all errors are catched!
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if self.parentStyleSheet and self.href:
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# relative href
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parentHref = self.parentStyleSheet.href
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if parentHref is None:
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# use cwd instead
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#parentHref = u'file:' + urllib.pathname2url(os.getcwd()) + '/'
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parentHref = cssutils.helper.path2url(os.getcwd()) + '/'
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href = urlparse.urljoin(parentHref, self.href)
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# all possible exceptions are ignored (styleSheet is None then)
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try:
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usedEncoding, enctype, cssText = self.parentStyleSheet._resolveImport(href)
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if cssText is None:
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# catched in next except below!
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raise IOError('Cannot read Stylesheet.')
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styleSheet = cssutils.css.CSSStyleSheet(href=href,
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media=self.media,
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ownerRule=self,
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title=self.name)
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# inherit fetcher for @imports in styleSheet
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styleSheet._setFetcher(self.parentStyleSheet._fetcher)
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# contentEncoding with parentStyleSheet.overrideEncoding,
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# HTTP or parent
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encodingOverride, encoding = None, None
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if enctype == 0:
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encodingOverride = usedEncoding
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elif 5 > enctype > 0:
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encoding = usedEncoding
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styleSheet._setCssTextWithEncodingOverride(cssText,
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encodingOverride=encodingOverride,
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encoding=encoding)
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except (OSError, IOError, ValueError), e:
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self._log.warn(u'CSSImportRule: While processing imported style sheet href=%r: %r'
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% (self.href, e), neverraise=True)
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else:
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self._styleSheet = styleSheet
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styleSheet = property(lambda self: self._styleSheet,
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doc="(readonly) The style sheet referred to by this rule.")
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type = property(lambda self: self.IMPORT_RULE,
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doc="The type of this rule, as defined by a CSSRule "
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"type constant.")
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def _getWellformed(self):
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"Depending if media is used at all."
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if self._usemedia:
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return bool(self.href and self.media.wellformed)
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else:
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return bool(self.href)
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wellformed = property(_getWellformed)
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