Package cssutils :: Package css :: Module csspagerule |
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# Source Code for Module cssutils.css.csspagerule

      1  """CSSPageRule implements DOM Level 2 CSS CSSPageRule.
      2  """
      3  __all__ = ['CSSPageRule']
      4  __docformat__ = 'restructuredtext'
      5  __version__ = '$Id: csspagerule.py 1284 2008-06-05 16:29:17Z cthedot $'
      6
      7  import xml.dom
      8  import cssrule
      9  import cssutils
     10  from selectorlist import SelectorList
     11  from cssstyledeclaration import CSSStyleDeclaration
     12
     13 -class CSSPageRule(cssrule.CSSRule):
     14      """
     15      The CSSPageRule interface represents a @page rule within a CSS style
     16      sheet. The @page rule is used to specify the dimensions, orientation,
     17      margins, etc. of a page box for paged media.
     18
     19      Properties
     20      ==========
     21      atkeyword (cssutils only)
     22          the literal keyword used
     23      cssText: of type DOMString
     24          The parsable textual representation of this rule
     25      selectorText: of type DOMString
     26          The parsable textual representation of the page selector for the rule.
     27      style: of type CSSStyleDeclaration
     28          The declaration-block of this rule.
     29
     30      Inherits properties from CSSRule
     31
     32      Format
     33      ======
     34      ::
     35
     36          page
     37            : PAGE_SYM S* pseudo_page? S*
     38              LBRACE S* declaration [ ';' S* declaration ]* '}' S*
     39            ;
     40          pseudo_page
     41            : ':' IDENT # :first, :left, :right in CSS 2.1
     42            ;
     43
     44      """
     45      type = property(lambda self: cssrule.CSSRule.PAGE_RULE)
     46      # constant but needed:
     47      wellformed = True
     48
     49 -    def __init__(self, selectorText=None, style=None, parentRule=None,
     50                   parentStyleSheet=None, readonly=False):
     51          """
     52          if readonly allows setting of properties in constructor only
     53
     54          selectorText
     55              type string
     56          style
     57              CSSStyleDeclaration for this CSSStyleRule
     58          """
     59          super(CSSPageRule, self).__init__(parentRule=parentRule,
     60                                            parentStyleSheet=parentStyleSheet)
     61          self._atkeyword = u'@page'
     62          tempseq = self._tempSeq()
     63          if selectorText:
     64              self.selectorText = selectorText
     65              tempseq.append(self.selectorText, 'selectorText')
     66          else:
     67              self._selectorText = u''
     68          if style:
     69              self.style = style
     70              tempseq.append(self.style, 'style')
     71          else:
     72              self._style = CSSStyleDeclaration(parentRule=self)
     73          self._setSeq(tempseq)
     74
     75          self._readonly = readonly
     76
     77 -    def __parseSelectorText(self, selectorText):
     78          """
     79          parses selectorText which may also be a list of tokens
     80          and returns (selectorText, seq)
     81
     82          see _setSelectorText for details
     83          """
     84          # for closures: must be a mutable
     85          new = {'selector': None, 'wellformed': True}
     86
     87          def _char(expected, seq, token, tokenizer=None):
     88              # pseudo_page, :left, :right or :first
     89              val = self._tokenvalue(token)
     90              if ':' == expected and u':' == val:
     91                  try:
     92                      identtoken = tokenizer.next()
     93                  except StopIteration:
     94                      self._log.error(
     95                          u'CSSPageRule selectorText: No IDENT found.', token)
     96                  else:
     97                      ival, ityp = self._tokenvalue(identtoken), self._type(identtoken)
     98                      if self._prods.IDENT != ityp:
     99                          self._log.error(
    100                              u'CSSPageRule selectorText: Expected IDENT but found: %r' %
    101                              ival, token)
    102                      else:
    103                          new['selector'] = val + ival
    104                          seq.append(new['selector'], 'selector')
    105                          return 'EOF'
    106                  return expected
    107              else:
    108                  new['wellformed'] = False
    109                  self._log.error(
    110                      u'CSSPageRule selectorText: Unexpected CHAR: %r' % val, token)
    111                  return expected
    112
    113          def S(expected, seq, token, tokenizer=None):
    114              "Does not raise if EOF is found."
    115              return expected
    116
    117          def COMMENT(expected, seq, token, tokenizer=None):
    118              "Does not raise if EOF is found."
    119              seq.append(cssutils.css.CSSComment([token]), 'COMMENT')
    120              return expected
    121
    122          newseq = self._tempSeq()
    123          wellformed, expected = self._parse(expected=':',
    124              seq=newseq, tokenizer=self._tokenize2(selectorText),
    125              productions={'CHAR': _char,
    126                           'COMMENT': COMMENT,
    127                           'S': S},
    128              new=new)
    129          wellformed = wellformed and new['wellformed']
    130          newselector = new['selector']
    131
    132          # post conditions
    133          if expected == 'ident':
    134              self._log.error(
    135                  u'CSSPageRule selectorText: No valid selector: %r' %
    136                      self._valuestr(selectorText))
    137
    138          if not newselector in (None, u':first', u':left', u':right'):
    139              self._log.warn(u'CSSPageRule: Unknown CSS 2.1 @page selector: %r' %
    140                       newselector, neverraise=True)
    141
    142          return newselector, newseq
    143
    144 -    def _getCssText(self):
    145          """
    146          returns serialized property cssText
    147          """
    148          return cssutils.ser.do_CSSPageRule(self)
    149
    150 -    def _setCssText(self, cssText):
    151          """
    152          DOMException on setting
    153
    154          - SYNTAX_ERR: (self, StyleDeclaration)
    155            Raised if the specified CSS string value has a syntax error and
    156            is unparsable.
    157          - INVALID_MODIFICATION_ERR: (self)
    158            Raised if the specified CSS string value represents a different
    159            type of rule than the current one.
    160          - HIERARCHY_REQUEST_ERR: (CSSStylesheet)
    161            Raised if the rule cannot be inserted at this point in the
    162            style sheet.
    163          - NO_MODIFICATION_ALLOWED_ERR: (CSSRule)
    164            Raised if the rule is readonly.
    165          """
    166          super(CSSPageRule, self)._setCssText(cssText)
    167
    168          tokenizer = self._tokenize2(cssText)
    169          if self._type(self._nexttoken(tokenizer)) != self._prods.PAGE_SYM:
    170              self._log.error(u'CSSPageRule: No CSSPageRule found: %s' %
    171                              self._valuestr(cssText),
    172                              error=xml.dom.InvalidModificationErr)
    173          else:
    174              wellformed = True
    175              selectortokens, startbrace = self._tokensupto2(tokenizer,
    176                                                             blockstartonly=True,
    177                                                             separateEnd=True)
    178              styletokens, braceorEOFtoken = self._tokensupto2(tokenizer,
    179                                                          blockendonly=True,
    180                                                          separateEnd=True)
    181              nonetoken = self._nexttoken(tokenizer)
    182              if self._tokenvalue(startbrace) != u'{':
    183                  wellformed = False
    184                  self._log.error(
    185                      u'CSSPageRule: No start { of style declaration found: %r' %
    186                      self._valuestr(cssText), startbrace)
    187              elif nonetoken:
    188                  wellformed = False
    189                  self._log.error(
    190                      u'CSSPageRule: Trailing content found.', token=nonetoken)
    191
    192
    193              newselector, newselectorseq = self.__parseSelectorText(selectortokens)
    194
    195              newstyle = CSSStyleDeclaration()
    196              val, typ = self._tokenvalue(braceorEOFtoken), self._type(braceorEOFtoken)
    197              if val != u'}' and typ != 'EOF':
    198                  wellformed = False
    199                  self._log.error(
    200                      u'CSSPageRule: No "}" after style declaration found: %r' %
    201                      self._valuestr(cssText))
    202              else:
    203                  if 'EOF' == typ:
    204                      # add again as style needs it
    205                      styletokens.append(braceorEOFtoken)
    206                  newstyle.cssText = styletokens
    207
    208              if wellformed:
    209                  self._selectorText = newselector # already parsed
    210                  self.style = newstyle
    211                  self._setSeq(newselectorseq) # contains upto style only
    212
    213      cssText = property(_getCssText, _setCssText,
    214          doc="(DOM) The parsable textual representation of the rule.")
    215
    216 -    def _getSelectorText(self):
    217          """
    218          wrapper for cssutils Selector object
    219          """
    220          return self._selectorText
    221
    222 -    def _setSelectorText(self, selectorText):
    223          """
    224          wrapper for cssutils Selector object
    225
    226          selector: DOM String
    227              in CSS 2.1 one of
    228              - :first
    229              - :left
    230              - :right
    231              - empty
    232
    233          If WS or Comments are included they are ignored here! Only
    234          way to add a comment is via setting ``cssText``
    235
    236          DOMException on setting
    237
    238          - SYNTAX_ERR:
    239            Raised if the specified CSS string value has a syntax error
    240            and is unparsable.
    241          - NO_MODIFICATION_ALLOWED_ERR: (self)
    242            Raised if this rule is readonly.
    243          """
    244          self._checkReadonly()
    245
    246          # may raise SYNTAX_ERR
    247          newselectortext, newseq = self.__parseSelectorText(selectorText)
    248
    249          if newselectortext:
    250              for i, x in enumerate(self.seq):
    251                  if x == self._selectorText:
    252                      self.seq[i] = newselectortext
    253              self._selectorText = newselectortext
    254
    255      selectorText = property(_getSelectorText, _setSelectorText,
    256          doc="""(DOM) The parsable textual representation of the page selector for the rule.""")
    257
    258 -    def _getStyle(self):
    259
    260          return self._style
    261
    262 -    def _setStyle(self, style):
    263          """
    264          style
    265              StyleDeclaration or string
    266          """
    267          self._checkReadonly()
    268
    269          if isinstance(style, basestring):
    270              self._style.cssText = style
    271          else:
    272              # cssText would be serialized with optional preferences
    273              # so use seq!
    274              self._style._seq = style.seq
    275
    276      style = property(_getStyle, _setStyle,
    277          doc="(DOM) The declaration-block of this rule set.")
    278
    279 -    def __repr__(self):
    280          return "cssutils.css.%s(selectorText=%r, style=%r)" % (
    281                  self.__class__.__name__, self.selectorText, self.style.cssText)
    282
    283 -    def __str__(self):
    284          return "<cssutils.css.%s object selectorText=%r style=%r at 0x%x>" % (
    285                  self.__class__.__name__, self.selectorText, self.style.cssText,
    286                  id(self))
    287