"""CSSImportRule implements DOM Level 2 CSS CSSImportRule plus the ``name`` property from http://www.w3.org/TR/css3-cascade/#cascading.""" __all__ = ['CSSImportRule'] import os import urllib.parse import xml.dom import cssutils from . import cssrule 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=None, name=None, parentRule=None, parentStyleSheet=None, readonly=False, ): """ If readonly allows setting of properties in constructor only :param href: location of the style sheet to be imported. :param mediaText: A list of media types for which this style sheet may be used as a string :param name: Additional name of imported style sheet """ super().__init__(parentRule=parentRule, parentStyleSheet=parentStyleSheet) self._atkeyword = '@import' self._styleSheet = None # string or uri used for reserialization self.hreftype = None # prepare seq seq = self._tempSeq() seq.append(None, 'href') # seq.append(None, 'media') seq.append(None, 'name') self._setSeq(seq) # 1. media if mediaText: self.media = mediaText else: # must be all for @import self.media = cssutils.stylesheets.MediaList(mediaText='all') # 2. name self.name = name # 3. href and styleSheet self.href = href self._readonly = readonly def __repr__(self): if self._usemedia: mediaText = self.media.mediaText else: mediaText = None return f"cssutils.css.{self.__class__.__name__}(href={self.href!r}, mediaText={mediaText!r}, name={self.name!r})" def __str__(self): if self._usemedia: mediaText = self.media.mediaText else: mediaText = None return f"" _usemedia = property( lambda self: self.media.mediaText not in ('', '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): # noqa: C901 """ :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()._setCssText(cssText) tokenizer = self._tokenize2(cssText) attoken = self._nexttoken(tokenizer, None) if self._type(attoken) != self._prods.IMPORT_SYM: self._log.error( 'CSSImportRule: No CSSImportRule found: %s' % self._valuestr(cssText), error=xml.dom.InvalidModificationErr, ) else: # 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('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('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 != ';' and lasttyp not in ('EOF', self._prods.STRING): new['wellformed'] = False self._log.error( 'CSSImportRule: No ";" found: %s' % self._valuestr(cssText), token=token, ) newMedia = cssutils.stylesheets.MediaList(parentRule=self) newMedia.mediaText = mediatokens if newMedia.wellformed: new['media'] = newMedia seq.append(newMedia, 'media') else: new['wellformed'] = False self._log.error( '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('CSSImportRule: Unexpected ident.', token) return expected def _char(expected, seq, token, tokenizer=None): # final ; val = self._tokenvalue(token) if expected.endswith(';') and ';' == val: return 'EOF' else: new['wellformed'] = False self._log.error('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 ok = wellformed and new['wellformed'] # post conditions if not new['href']: ok = False self._log.error( 'CSSImportRule: No href found: %s' % self._valuestr(cssText) ) if expected != 'EOF': ok = False self._log.error( 'CSSImportRule: No ";" found: %s' % self._valuestr(cssText) ) # set all if ok: self._setSeq(newseq) self.atkeyword = new['keyword'] self.hreftype = new['hreftype'] self.name = new['name'] if new['media']: self.media = new['media'] else: # must be all for @import self.media = cssutils.stylesheets.MediaList(mediaText='all') # needs new self.media self.href = new['href'] cssText = property( fget=_getCssText, fset=_setCssText, doc="(DOM) The parsable textual representation of this rule.", ) def _setHref(self, href): # set new href self._href = href # update seq for i, item in enumerate(self.seq): type_ = item.type if 'href' == type_: self._seq[i] = (href, type_, item.line, item.col) break importedSheet = cssutils.css.CSSStyleSheet( media=self.media, ownerRule=self, title=self.name ) self.hrefFound = False # set styleSheet if href and self.parentStyleSheet: # loading errors are all catched! # relative href parentHref = self.parentStyleSheet.href if parentHref is None: # use cwd instead parentHref = cssutils.helper.path2url(os.getcwd()) + '/' fullhref = urllib.parse.urljoin(parentHref, self.href) # all possible exceptions are ignored try: usedEncoding, enctype, cssText = self.parentStyleSheet._resolveImport( fullhref ) if cssText is None: # catched in next except below! raise OSError('Cannot read Stylesheet.') # contentEncoding with parentStyleSheet.overrideEncoding, # HTTP or parent encodingOverride, encoding = None, None if enctype == 0: encodingOverride = usedEncoding elif 0 < enctype < 5: encoding = usedEncoding # inherit fetcher for @imports in styleSheet importedSheet._href = fullhref importedSheet._setFetcher(self.parentStyleSheet._fetcher) importedSheet._setCssTextWithEncodingOverride( cssText, encodingOverride=encodingOverride, encoding=encoding ) except (OSError, ValueError) as e: self._log.warn( 'CSSImportRule: While processing imported ' 'style sheet href=%s: %r' % (self.href, e), neverraise=True, ) else: # used by resolveImports if to keep unprocessed href self.hrefFound = True self._styleSheet = importedSheet _href = None # needs to be set href = property( lambda self: self._href, _setHref, doc="Location of the style sheet to be imported.", ) def _setMedia(self, media): """ :param media: a :class:`~cssutils.stylesheets.MediaList` or string """ self._checkReadonly() if isinstance(media, str): self._media = cssutils.stylesheets.MediaList( mediaText=media, parentRule=self ) else: media._parentRule = self self._media = media # update seq ihref = 0 for i, item in enumerate(self.seq): if item.type == 'href': ihref = i elif item.type == 'media': self.seq[i] = (self._media, 'media', None, None) break else: # if no media until now add after href self.seq.insert(ihref + 1, self._media, 'media', None, None) media = property( lambda self: self._media, _setMedia, doc="(DOM) 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 name is None or isinstance(name, str): # "" or '' handled as None if not name: name = None # save name self._name = name # update seq for i, item in enumerate(self.seq): typ = item.type if 'name' == typ: self._seq[i] = (name, typ, item.line, item.col) break # set title of imported sheet if self.styleSheet: self.styleSheet.title = name else: self._log.error('CSSImportRule: Not a valid name: %s' % name) def _getName(self): return self._name name = property( _getName, _setName, doc="An optional name for the imported sheet.", ) 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 on 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)