/usr/lib/python2.7/dist-packages/cssutils/css/cssvariablesdeclaration.py is in python-cssutils 1.0-4.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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http://disruptive-innovations.com/zoo/cssvariables/#mozTocId496530
"""
__all__ = ['CSSVariablesDeclaration']
__docformat__ = 'restructuredtext'
__version__ = '$Id: cssstyledeclaration.py 1819 2009-08-01 20:52:43Z cthedot $'
from cssutils.prodparser import *
from cssutils.helper import normalize
from value import PropertyValue
import cssutils
import itertools
import xml.dom
class CSSVariablesDeclaration(cssutils.util._NewBase):
"""The CSSVariablesDeclaration interface represents a single block of
variable declarations.
"""
def __init__(self, cssText=u'', parentRule=None, readonly=False):
"""
:param cssText:
Shortcut, sets CSSVariablesDeclaration.cssText
:param parentRule:
The CSS rule that contains this declaration block or
None if this CSSVariablesDeclaration is not attached to a CSSRule.
:param readonly:
defaults to False
Format::
variableset
: vardeclaration [ ';' S* vardeclaration ]* S*
;
vardeclaration
: varname ':' S* term
;
varname
: IDENT S*
;
"""
super(CSSVariablesDeclaration, self).__init__()
self._parentRule = parentRule
self._vars = {}
if cssText:
self.cssText = cssText
self._readonly = readonly
def __repr__(self):
return u"cssutils.css.%s(cssText=%r)" % (self.__class__.__name__,
self.cssText)
def __str__(self):
return u"<cssutils.css.%s object length=%r at 0x%x>" % (
self.__class__.__name__,
self.length,
id(self))
def __contains__(self, variableName):
"""Check if a variable is in variable declaration block.
:param variableName:
a string
"""
return normalize(variableName) in self.keys()
def __getitem__(self, variableName):
"""Retrieve the value of variable ``variableName`` from this
declaration.
"""
return self.getVariableValue(variableName)
def __setitem__(self, variableName, value):
self.setVariable(variableName, value)
def __delitem__(self, variableName):
return self.removeVariable(variableName)
def __iter__(self):
"""Iterator of names of set variables."""
for name in self.keys():
yield name
def keys(self):
"""Analoguous to standard dict returns variable names which are set in
this declaration."""
return self._vars.keys()
def _getCssText(self):
"""Return serialized property cssText."""
return cssutils.ser.do_css_CSSVariablesDeclaration(self)
def _setCssText(self, cssText):
"""Setting this attribute will result in the parsing of the new value
and resetting of all the properties in the declaration block
including the removal or addition of properties.
:exceptions:
- :exc:`~xml.dom.NoModificationAllowedErr`:
Raised if this declaration is readonly or a property is readonly.
- :exc:`~xml.dom.SyntaxErr`:
Raised if the specified CSS string value has a syntax error and
is unparsable.
Format::
variableset
: vardeclaration [ ';' S* vardeclaration ]*
;
vardeclaration
: varname ':' S* term
;
varname
: IDENT S*
;
expr
: [ VARCALL | term ] [ operator [ VARCALL | term ] ]*
;
"""
self._checkReadonly()
vardeclaration = Sequence(
PreDef.ident(),
PreDef.char(u':', u':', toSeq=False, optional=True),
#PreDef.S(toSeq=False, optional=True),
Prod(name=u'term', match=lambda t, v: True,
toSeq=lambda t, tokens: (u'value',
PropertyValue(itertools.chain([t],
tokens),
parent=self)
)
)
)
prods = Sequence(vardeclaration,
Sequence(PreDef.S(optional=True),
PreDef.char(u';', u';', toSeq=False, optional=True),
PreDef.S(optional=True),
vardeclaration,
minmax=lambda: (0, None)),
PreDef.S(optional=True),
PreDef.char(u';', u';', toSeq=False, optional=True)
)
# parse
wellformed, seq, store, notused = \
ProdParser().parse(cssText,
u'CSSVariableDeclaration',
prods,
emptyOk=True)
if wellformed:
newseq = self._tempSeq()
newvars = {}
# seq contains only name: value pairs plus comments etc
nameitem = None
for item in seq:
if u'IDENT' == item.type:
nameitem = item
elif u'value' == item.type:
nname = normalize(nameitem.value)
if nname in newvars:
# replace var with same name
for i, it in enumerate(newseq):
if normalize(it.value[0]) == nname:
newseq.replace(i,
(nameitem.value, item.value),
'var',
nameitem.line, nameitem.col)
else:
# saved non normalized name for reserialization
newseq.append((nameitem.value, item.value),
'var',
nameitem.line, nameitem.col)
# newseq.append((nameitem.value, item.value),
# 'var',
# nameitem.line, nameitem.col)
newvars[nname] = item.value
else:
newseq.appendItem(item)
self._setSeq(newseq)
self._vars = newvars
self.wellformed = True
cssText = property(_getCssText, _setCssText,
doc=u"(DOM) A parsable textual representation of the declaration "
u"block excluding the surrounding curly braces.")
def _setParentRule(self, parentRule):
self._parentRule = parentRule
parentRule = property(lambda self: self._parentRule, _setParentRule,
doc=u"(DOM) The CSS rule that contains this"
u" declaration block or None if this block"
u" is not attached to a CSSRule.")
def getVariableValue(self, variableName):
"""Used to retrieve the value of a variable if it has been explicitly
set within this variable declaration block.
:param variableName:
The name of the variable.
:returns:
the value of the variable if it has been explicitly set in this
variable declaration block. Returns the empty string if the
variable has not been set.
"""
try:
return self._vars[normalize(variableName)].cssText
except KeyError, e:
return u''
def removeVariable(self, variableName):
"""Used to remove a variable if it has been explicitly set within this
variable declaration block.
:param variableName:
The name of the variable.
:returns:
the value of the variable if it has been explicitly set for this
variable declaration block. Returns the empty string if the
variable has not been set.
:exceptions:
- :exc:`~xml.dom.NoModificationAllowedErr`:
Raised if this declaration is readonly is readonly.
"""
normalname = variableName
try:
r = self._vars[normalname]
except KeyError, e:
return u''
else:
self.seq._readonly = False
if normalname in self._vars:
for i, x in enumerate(self.seq):
if x.value[0] == variableName:
del self.seq[i]
self.seq._readonly = True
del self._vars[normalname]
return r.cssText
def setVariable(self, variableName, value):
"""Used to set a variable value within this variable declaration block.
:param variableName:
The name of the CSS variable.
:param value:
The new value of the variable, may also be a PropertyValue object.
:exceptions:
- :exc:`~xml.dom.SyntaxErr`:
Raised if the specified value has a syntax error and is
unparsable.
- :exc:`~xml.dom.NoModificationAllowedErr`:
Raised if this declaration is readonly or the property is
readonly.
"""
self._checkReadonly()
# check name
wellformed, seq, store, unused = \
ProdParser().parse(normalize(variableName),
u'variableName',
Sequence(PreDef.ident()))
if not wellformed:
self._log.error(u'Invalid variableName: %r: %r'
% (variableName, value))
else:
# check value
if isinstance(value, PropertyValue):
v = value
else:
v = PropertyValue(cssText=value, parent=self)
if not v.wellformed:
self._log.error(u'Invalid variable value: %r: %r'
% (variableName, value))
else:
# update seq
self.seq._readonly = False
variableName = normalize(variableName)
if variableName in self._vars:
for i, x in enumerate(self.seq):
if x.value[0] == variableName:
self.seq.replace(i,
[variableName, v],
x.type,
x.line,
x.col)
break
else:
self.seq.append([variableName, v], 'var')
self.seq._readonly = True
self._vars[variableName] = v
def item(self, index):
"""Used to retrieve the variables that have been explicitly set in
this variable declaration block. The order of the variables
retrieved using this method does not have to be the order in which
they were set. This method can be used to iterate over all variables
in this variable declaration block.
:param index:
of the variable name to retrieve, negative values behave like
negative indexes on Python lists, so -1 is the last element
:returns:
The name of the variable at this ordinal position. The empty
string if no variable exists at this position.
"""
try:
return self.keys()[index]
except IndexError:
return u''
length = property(lambda self: len(self._vars),
doc=u"The number of variables that have been explicitly set in this"
u" variable declaration block. The range of valid indices is 0"
u" to length-1 inclusive.")
|