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