Package cssutils
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Source Code for Package cssutils

  1  #!/usr/bin/env python 
  2  """cssutils - CSS Cascading Style Sheets library for Python 
  3   
  4      Copyright (C) 2004-2008 Christof Hoeke 
  5   
  6      This library is free software; you can redistribute it and/or 
  7      modify it under the terms of the GNU Lesser General Public 
  8      License as published by the Free Software Foundation; either 
  9      version 2.1 of the License, or (at your option) any later version. 
 10   
 11      This library is distributed in the hope that it will be useful, 
 12      but WITHOUT ANY WARRANTY; without even the implied warranty of 
 13      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
 14      Lesser General Public License for more details. 
 15   
 16      You should have received a copy of the GNU Lesser General Public 
 17      License along with this library; if not, write to the Free Software 
 18      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 19   
 20  A Python package to parse and build CSS Cascading Style Sheets. 
 21   
 22  Based upon and partly implements the following specifications (DOM only, not any rendering facilities): 
 23   
 24  `DOM Level 2 Style CSS <http://www.w3.org/TR/DOM-Level-2-Style/css.html>`__ 
 25      DOM for package css 
 26  `DOM Level 2 Style Stylesheets <http://www.w3.org/TR/DOM-Level-2-Style/stylesheets.html>`__ 
 27      DOM for package stylesheets 
 28  `CSSOM <http://dev.w3.org/csswg/cssom/>`__ 
 29      A few details (mainly the NamespaceRule DOM) is taken from here. Plan is to move implementation to the stuff defined here which is newer but still no REC so might change in the future 
 30   
 31  `CSS 2.1 <http://www.w3.org/TR/CSS21/>`__ 
 32      Rules and properties are defined here 
 33  `CSS 2.1 Errata  <http://www.w3.org/Style/css2-updates/CR-CSS21-20070719-errata.html>`__ 
 34      A few erratas, mainly the definition of CHARSET_SYM tokens 
 35  `MediaQueries <http://www.w3.org/TR/css3-mediaqueries/>`__ 
 36      MediaQueries are part of ``stylesheets.MediaList`` since v0.9.4, used in @import and @media rules. 
 37  `Namespaces <http://www.w3.org/TR/css3-namespace/>`__ 
 38      Added in v0.9.1 and updated to definition in CSSOM in v0.9.4 
 39  `Selectors <http://www.w3.org/TR/css3-selectors/>`__ 
 40      The selector syntax defined here (and not in CSS 2.1) should be parsable with cssutils (*should* mind though ;) ) 
 41   
 42   
 43  Please visit http://cthedot.de/cssutils/ for full details and updates. 
 44   
 45  Tested with Python 2.5 on Windows XP. 
 46   
 47   
 48  This library is optimized for usage of ``from cssutils import *`` which 
 49  import subpackages ``css`` and ``stylesheets``, CSSParser and 
 50  CSSSerializer classes only. 
 51   
 52  Usage may be:: 
 53   
 54      >>> from cssutils import * 
 55      >>> parser = CSSParser() 
 56      >>> sheet = parser.parseString(u'a { color: red}') 
 57      >>> print sheet.cssText 
 58   
 59  """ 
 60  __all__ = ['css', 'stylesheets', 
 61             'CSSParser', 'CSSSerializer'] 
 62  __docformat__ = 'restructuredtext' 
 63  __author__ = '$LastChangedBy: cthedot $' 
 64  __date__ = '$LastChangedDate: 2008-01-13 18:10:54 +0100 (So, 13 Jan 2008) $' 
 65  __version__ = '0.9.5a1 $LastChangedRevision: 846 $' 
 66   
 67  import codec 
 68   
 69  # order of imports is important (maybe as it is partly circular) 
 70  import xml.dom 
 71   
 72  import errorhandler 
 73  log = errorhandler.ErrorHandler() 
 74   
 75  import util 
 76  import css 
 77  import stylesheets 
 78  from parse import CSSParser 
 79   
 80  from serialize import CSSSerializer 
 81  ser = CSSSerializer() 
 82   
83 -class DOMImplementationCSS(object):
84 """ 85 This interface allows the DOM user to create a CSSStyleSheet 86 outside the context of a document. There is no way to associate 87 the new CSSStyleSheet with a document in DOM Level 2. 88 89 This class is its *own factory*, as it is given to 90 xml.dom.registerDOMImplementation which simply calls it and receives 91 an instance of this class then. 92 """ 93 _features = [ 94 ('css', '1.0'), 95 ('css', '2.0'), 96 ('stylesheets', '1.0'), 97 ('stylesheets', '2.0') 98 ] 99
100 - def createCSSStyleSheet(self, title, media):
101 """ 102 Creates a new CSSStyleSheet. 103 104 title of type DOMString 105 The advisory title. See also the Style Sheet Interfaces 106 section. 107 media of type DOMString 108 The comma-separated list of media associated with the new style 109 sheet. See also the Style Sheet Interfaces section. 110 111 returns 112 CSSStyleSheet: A new CSS style sheet. 113 114 TODO: DOMException 115 SYNTAX_ERR: Raised if the specified media string value has a 116 syntax error and is unparsable. 117 """ 118 return css.CSSStyleSheet(title=title, media=media)
119
120 - def createDocument(self, *args):
121 # not needed to HTML, also not for CSS? 122 raise NotImplementedError
123
124 - def createDocumentType(self, *args):
125 # not needed to HTML, also not for CSS? 126 raise NotImplementedError
127
128 - def hasFeature(self, feature, version):
129 return (feature.lower(), unicode(version)) in self._features
130 131 xml.dom.registerDOMImplementation('cssutils', DOMImplementationCSS) 132 133 134 # parser helper functions
135 -def parse(filename, encoding=None, href=None, media=None):
136 """ 137 reads file with given filename in given encoding (if given) 138 and returns CSSStyleSheet object 139 """ 140 return CSSParser().parse(filename, encoding)
141
142 -def parseString(cssText, href=None, media=None):
143 """ 144 parses given string and returns CSSStyleSheet object 145 """ 146 return CSSParser().parseString(cssText, href=href, media=media)
147 148 # set "ser", default serializer
149 -def setSerializer(serializer):
150 """ 151 sets the global serializer used by all class in cssutils 152 """ 153 global ser 154 ser = serializer
155 156 157 if __name__ == '__main__': 158 print __doc__ 159