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1 """ 2 MediaQuery, see http://www.w3.org/TR/css3-mediaqueries/ 3 4 A cssutils own implementation, not defined in official DOM 5 6 TODO: 7 add possibility to 8 9 part of a media_query_list: <media_query> [, <media_query> ]* 10 see stylesheets.MediaList 11 """ 12 __all__ = ['MediaQuery'] 13 __docformat__ = 'restructuredtext' 14 __version__ = '$Id: mediaquery.py 1363 2008-07-13 18:14:26Z cthedot $' 15 16 import re 17 import xml.dom 18 import cssutils 1921 """ 22 A Media Query consists of a media type and one or more 23 expressions involving media features. 24 25 Properties 26 ========== 27 mediaText: of type DOMString 28 The parsable textual representation of this MediaQuery 29 mediaType: of type DOMString 30 one of MEDIA_TYPES like e.g. 'print' 31 seq: a list (cssutils) 32 All parts of this MediaQuery including CSSComments 33 wellformed: 34 if this query is wellformed 35 36 Format 37 ====== 38 :: 39 40 media_query: [[only | not]? <media_type> [ and <expression> ]*] 41 | <expression> [ and <expression> ]* 42 expression: ( <media_feature> [: <value>]? ) 43 media_type: all | aural | braille | handheld | print | 44 projection | screen | tty | tv | embossed 45 media_feature: width | min-width | max-width 46 | height | min-height | max-height 47 | device-width | min-device-width | max-device-width 48 | device-height | min-device-height | max-device-height 49 | device-aspect-ratio | min-device-aspect-ratio | max-device-aspect-ratio 50 | color | min-color | max-color 51 | color-index | min-color-index | max-color-index 52 | monochrome | min-monochrome | max-monochrome 53 | resolution | min-resolution | max-resolution 54 | scan | grid 55 56 """ 57 MEDIA_TYPES = [u'all', u'aural', u'braille', u'embossed', u'handheld', 58 u'print', u'projection', u'screen', u'tty', u'tv'] 59 60 # From the HTML spec (see MediaQuery): 61 # "[...] character that isn't a US ASCII letter [a-zA-Z] (Unicode 62 # decimal 65-90, 97-122), digit [0-9] (Unicode hex 30-39), or hyphen (45)." 63 # so the following is a valid mediaType 64 __mediaTypeMatch = re.compile(ur'^[-a-zA-Z0-9]+$', re.U).match 65152 153 # expected: only|not or mediatype, mediatype, feature, and 154 newseq = [] 155 wellformed, expected = self._parse(expected='only|not or mediatype', 156 seq=newseq, tokenizer=tokenizer, 157 productions={'IDENT': _ident_or_dim, # e.g. "print" 158 'DIMENSION': _ident_or_dim, # e.g. "3d" 159 'CHAR': _char}) 160 wellformed = wellformed and new['wellformed'] 161 162 # post conditions 163 if not new['mediatype']: 164 wellformed = False 165 self._log.error(u'MediaQuery: No mediatype found: %s' % 166 self._valuestr(mediaText)) 167 168 if wellformed: 169 # set 170 self.mediaType = new['mediatype'] 171 self.seq = newseq 172 173 mediaText = property(_getMediaText, _setMediaText, 174 doc="""(DOM) The parsable textual representation of the media list. 175 This is a comma-separated list of media.""") 176 18267 """ 68 mediaText 69 unicodestring of parsable media 70 """ 71 super(MediaQuery, self).__init__() 72 73 self.seq = [] 74 self._mediaType = u'' 75 if mediaText: 76 self.mediaText = mediaText # sets self._mediaType too 77 78 self._readonly = readonly7981 """ 82 returns serialized property mediaText 83 """ 84 return cssutils.ser.do_stylesheets_mediaquery(self)8587 """ 88 mediaText 89 a single media query string, e.g. "print and (min-width: 25cm)" 90 91 DOMException 92 93 - SYNTAX_ERR: (self) 94 Raised if the specified string value has a syntax error and is 95 unparsable. 96 - INVALID_CHARACTER_ERR: (self) 97 Raised if the given mediaType is unknown. 98 - NO_MODIFICATION_ALLOWED_ERR: (self) 99 Raised if this media query is readonly. 100 """ 101 self._checkReadonly() 102 tokenizer = self._tokenize2(mediaText) 103 if not tokenizer: 104 self._log.error(u'MediaQuery: No MediaText given.') 105 else: 106 # for closures: must be a mutable 107 new = {'mediatype': None, 108 'wellformed': True } 109 110 def _ident_or_dim(expected, seq, token, tokenizer=None): 111 # only|not or mediatype or and 112 val = self._tokenvalue(token) 113 nval = self._normalize(val) 114 if expected.endswith('mediatype'): 115 if nval in (u'only', u'not'): 116 # only or not 117 seq.append(val) 118 return 'mediatype' 119 else: 120 # mediatype 121 new['mediatype'] = val 122 seq.append(val) 123 return 'and' 124 elif 'and' == nval and expected.startswith('and'): 125 seq.append(u'and') 126 return 'feature' 127 else: 128 new['wellformed'] = False 129 self._log.error( 130 u'MediaQuery: Unexpected syntax.', token=token) 131 return expected132 133 def _char(expected, seq, token, tokenizer=None): 134 # starting a feature which basically is a CSS Property 135 # but may simply be a property name too 136 val = self._tokenvalue(token) 137 if val == u'(' and expected == 'feature': 138 proptokens = self._tokensupto2( 139 tokenizer, funcendonly=True) 140 if proptokens and u')' == self._tokenvalue(proptokens[-1]): 141 proptokens.pop() 142 property = cssutils.css.Property(_mediaQuery=True) 143 property.cssText = proptokens 144 seq.append(property) 145 return 'and or EOF' 146 else: 147 new['wellformed'] = False 148 self._log.error( 149 u'MediaQuery: Unexpected syntax, expected "and" but found "%s".' % 150 val, token) 151 return expected184 """ 185 mediaType 186 one of MEDIA_TYPES 187 188 DOMException 189 190 - SYNTAX_ERR: (self) 191 Raised if the specified string value has a syntax error and is 192 unparsable. 193 - INVALID_CHARACTER_ERR: (self) 194 Raised if the given mediaType is unknown. 195 - NO_MODIFICATION_ALLOWED_ERR: (self) 196 Raised if this media query is readonly. 197 """ 198 self._checkReadonly() 199 nmediaType = self._normalize(mediaType) 200 201 if not MediaQuery.__mediaTypeMatch(nmediaType): 202 self._log.error( 203 u'MediaQuery: Syntax Error in media type "%s".' % mediaType, 204 error=xml.dom.SyntaxErr) 205 else: 206 if nmediaType not in MediaQuery.MEDIA_TYPES: 207 self._log.warn( 208 u'MediaQuery: Unknown media type "%s".' % mediaType, 209 error=xml.dom.InvalidCharacterErr) 210 return 211 212 # set 213 self._mediaType = mediaType 214 215 # update seq 216 for i, x in enumerate(self.seq): 217 if isinstance(x, basestring): 218 if self._normalize(x) in (u'only', u'not'): 219 continue 220 else: 221 self.seq[i] = mediaType 222 break 223 else: 224 self.seq.insert(0, mediaType)225 226 mediaType = property(_getMediaType, _setMediaType, 227 doc="""(DOM) media type (one of MediaQuery.MEDIA_TYPES) of this MediaQuery.""") 228 229 wellformed = property(lambda self: bool(len(self.seq))) 230 234236 return "<cssutils.stylesheets.%s object mediaText=%r at 0x%x>" % ( 237 self.__class__.__name__, self.mediaText, id(self))238
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