/usr/lib/python3/dist-packages/xhtml2pdf/w3c/cssParser.py is in python3-xhtml2pdf 0.2.1-1.
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#!/usr/bin/env python
##~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
##~ Copyright (C) 2002-2004 TechGame Networks, LLC.
##~
##~ This library is free software; you can redistribute it and/or
##~ modify it under the terms of the BSD style License as found in the
##~ LICENSE file included with this distribution.
##
## Modified by Dirk Holtwick <holtwick@web.de>, 2007-2008
##~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
from __future__ import absolute_import
# Added by benjaoming to fix python3 tests
from __future__ import unicode_literals
try:
from future_builtins import filter
except ImportError:
pass
"""CSS-2.1 parser.
The CSS 2.1 Specification this parser was derived from can be found at http://www.w3.org/TR/CSS21/
Primary Classes:
* CSSParser
Parses CSS source forms into results using a Builder Pattern. Must
provide concrete implemenation of CSSBuilderAbstract.
* CSSBuilderAbstract
Outlines the interface between CSSParser and it's rule-builder.
Compose CSSParser with a concrete implementation of the builder to get
usable results from the CSS parser.
Dependencies:
python 2.3 (or greater)
re
"""
import re
import six
from . import cssSpecial
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#~ Definitions
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def isAtRuleIdent(src, ident):
return re.match(r'^@' + ident + r'\s*', src)
def stripAtRuleIdent(src):
return re.sub(r'^@[a-z\-]+\s*', '', src)
class CSSSelectorAbstract(object):
"""Outlines the interface between CSSParser and it's rule-builder for selectors.
CSSBuilderAbstract.selector and CSSBuilderAbstract.combineSelectors must
return concrete implementations of this abstract.
See css.CSSMutableSelector for an example implementation.
"""
def addHashId(self, hashId):
raise NotImplementedError('Subclass responsibility')
def addClass(self, class_):
raise NotImplementedError('Subclass responsibility')
def addAttribute(self, attrName):
raise NotImplementedError('Subclass responsibility')
def addAttributeOperation(self, attrName, op, attrValue):
raise NotImplementedError('Subclass responsibility')
def addPseudo(self, name):
raise NotImplementedError('Subclass responsibility')
def addPseudoFunction(self, name, value):
raise NotImplementedError('Subclass responsibility')
class CSSBuilderAbstract(object):
"""Outlines the interface between CSSParser and it's rule-builder. Compose
CSSParser with a concrete implementation of the builder to get usable
results from the CSS parser.
See css.CSSBuilder for an example implementation
"""
def setCharset(self, charset):
raise NotImplementedError('Subclass responsibility')
#~ css results ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def beginStylesheet(self):
raise NotImplementedError('Subclass responsibility')
def stylesheet(self, elements):
raise NotImplementedError('Subclass responsibility')
def endStylesheet(self):
raise NotImplementedError('Subclass responsibility')
def beginInline(self):
raise NotImplementedError('Subclass responsibility')
def inline(self, declarations):
raise NotImplementedError('Subclass responsibility')
def endInline(self):
raise NotImplementedError('Subclass responsibility')
def ruleset(self, selectors, declarations):
raise NotImplementedError('Subclass responsibility')
#~ css namespaces ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def resolveNamespacePrefix(self, nsPrefix, name):
raise NotImplementedError('Subclass responsibility')
#~ css @ directives ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def atCharset(self, charset):
raise NotImplementedError('Subclass responsibility')
def atImport(self, import_, mediums, cssParser):
raise NotImplementedError('Subclass responsibility')
def atNamespace(self, nsPrefix, uri):
raise NotImplementedError('Subclass responsibility')
def atMedia(self, mediums, ruleset):
raise NotImplementedError('Subclass responsibility')
def atPage(self, page, pseudopage, declarations):
raise NotImplementedError('Subclass responsibility')
def atFontFace(self, declarations):
raise NotImplementedError('Subclass responsibility')
def atIdent(self, atIdent, cssParser, src):
return src, NotImplemented
#~ css selectors ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def combineSelectors(self, selectorA, combiner, selectorB):
"""Return value must implement CSSSelectorAbstract"""
raise NotImplementedError('Subclass responsibility')
def selector(self, name):
"""Return value must implement CSSSelectorAbstract"""
raise NotImplementedError('Subclass responsibility')
#~ css declarations ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def property(self, name, value, important=False):
raise NotImplementedError('Subclass responsibility')
def combineTerms(self, termA, combiner, termB):
raise NotImplementedError('Subclass responsibility')
def termIdent(self, value):
raise NotImplementedError('Subclass responsibility')
def termNumber(self, value, units=None):
raise NotImplementedError('Subclass responsibility')
def termRGB(self, value):
raise NotImplementedError('Subclass responsibility')
def termURI(self, value):
raise NotImplementedError('Subclass responsibility')
def termString(self, value):
raise NotImplementedError('Subclass responsibility')
def termUnicodeRange(self, value):
raise NotImplementedError('Subclass responsibility')
def termFunction(self, name, value):
raise NotImplementedError('Subclass responsibility')
def termUnknown(self, src):
raise NotImplementedError('Subclass responsibility')
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#~ CSS Parser
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class CSSParseError(Exception):
src = None
ctxsrc = None
fullsrc = None
inline = False
srcCtxIdx = None
srcFullIdx = None
ctxsrcFullIdx = None
def __init__(self, msg, src, ctxsrc=None):
Exception.__init__(self, msg)
self.src = src
self.ctxsrc = ctxsrc or src
if self.ctxsrc:
self.srcCtxIdx = self.ctxsrc.find(self.src)
if self.srcCtxIdx < 0:
del self.srcCtxIdx
def __str__(self):
if self.ctxsrc:
return Exception.__str__(self) + ':: (' + repr(self.ctxsrc[:self.srcCtxIdx]) + ', ' + repr(
self.ctxsrc[self.srcCtxIdx:self.srcCtxIdx + 20]) + ')'
else:
return Exception.__str__(self) + ':: ' + repr(self.src[:40])
def setFullCSSSource(self, fullsrc, inline=False):
self.fullsrc = fullsrc
if type(self.fullsrc) == six.binary_type:
self.fullsrc = six.text_type(self.fullsrc, 'utf-8')
if inline:
self.inline = inline
if self.fullsrc:
self.srcFullIdx = self.fullsrc.find(self.src)
if self.srcFullIdx < 0:
del self.srcFullIdx
self.ctxsrcFullIdx = self.fullsrc.find(self.ctxsrc)
if self.ctxsrcFullIdx < 0:
del self.ctxsrcFullIdx
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class CSSParser(object):
"""CSS-2.1 parser dependent only upon the re module.
Implemented directly from http://www.w3.org/TR/CSS21/grammar.html
Tested with some existing CSS stylesheets for portability.
CSS Parsing API:
* setCSSBuilder()
To set your concrete implementation of CSSBuilderAbstract
* parseFile()
Use to parse external stylesheets using a file-like object
>>> cssFile = open('test.css', 'r')
>>> stylesheets = myCSSParser.parseFile(cssFile)
* parse()
Use to parse embedded stylesheets using source string
>>> cssSrc = '''
body,body.body {
font: 110%, "Times New Roman", Arial, Verdana, Helvetica, serif;
background: White;
color: Black;
}
a {text-decoration: underline;}
'''
>>> stylesheets = myCSSParser.parse(cssSrc)
* parseInline()
Use to parse inline stylesheets using attribute source string
>>> style = 'font: 110%, "Times New Roman", Arial, Verdana, Helvetica, serif; background: White; color: Black'
>>> stylesheets = myCSSParser.parseInline(style)
* parseAttributes()
Use to parse attribute string values into inline stylesheets
>>> stylesheets = myCSSParser.parseAttributes(
font='110%, "Times New Roman", Arial, Verdana, Helvetica, serif',
background='White',
color='Black')
* parseSingleAttr()
Use to parse a single string value into a CSS expression
>>> fontValue = myCSSParser.parseSingleAttr('110%, "Times New Roman", Arial, Verdana, Helvetica, serif')
"""
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#~ Constants / Variables / Etc.
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ParseError = CSSParseError
AttributeOperators = ['=', '~=', '|=', '&=', '^=', '!=', '<>']
SelectorQualifiers = ('#', '.', '[', ':')
SelectorCombiners = ['+', '>']
ExpressionOperators = ('/', '+', ',')
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#~ Regular expressions
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
if True: # makes the following code foldable
_orRule = lambda *args: '|'.join(args)
_reflags = re.I | re.M | re.U
i_hex = '[0-9a-fA-F]'
i_nonascii = '[\200-\377]'
i_unicode = '\\\\(?:%s){1,6}\s?' % i_hex
i_escape = _orRule(i_unicode, '\\\\[ -~\200-\377]')
# i_nmstart = _orRule('[A-Za-z_]', i_nonascii, i_escape)
i_nmstart = _orRule('\-[^0-9]|[A-Za-z_]', i_nonascii,
i_escape) # XXX Added hyphen, http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier
i_nmchar = _orRule('[-0-9A-Za-z_]', i_nonascii, i_escape)
i_ident = '((?:%s)(?:%s)*)' % (i_nmstart, i_nmchar)
re_ident = re.compile(i_ident, _reflags)
# Caution: treats all characters above 0x7f as legal for an identifier.
i_unicodeid = r'([^\u0000-\u007f]+)'
re_unicodeid = re.compile(i_unicodeid, _reflags)
i_unicodestr1 = r'(\'[^\u0000-\u007f]+\')'
i_unicodestr2 = r'(\"[^\u0000-\u007f]+\")'
i_unicodestr = _orRule(i_unicodestr1, i_unicodestr2)
re_unicodestr = re.compile(i_unicodestr, _reflags)
i_element_name = '((?:%s)|\*)' % (i_ident[1:-1],)
re_element_name = re.compile(i_element_name, _reflags)
i_namespace_selector = '((?:%s)|\*|)\|(?!=)' % (i_ident[1:-1],)
re_namespace_selector = re.compile(i_namespace_selector, _reflags)
i_class = '\\.' + i_ident
re_class = re.compile(i_class, _reflags)
i_hash = '#((?:%s)+)' % i_nmchar
re_hash = re.compile(i_hash, _reflags)
i_rgbcolor = '(#%s{6}|#%s{3})' % (i_hex, i_hex)
re_rgbcolor = re.compile(i_rgbcolor, _reflags)
i_nl = '\n|\r\n|\r|\f'
i_escape_nl = '\\\\(?:%s)' % i_nl
i_string_content = _orRule('[\t !#$%&(-~]', i_escape_nl, i_nonascii, i_escape)
i_string1 = '\"((?:%s|\')*)\"' % i_string_content
i_string2 = '\'((?:%s|\")*)\'' % i_string_content
i_string = _orRule(i_string1, i_string2)
re_string = re.compile(i_string, _reflags)
i_uri = ('url\\(\s*(?:(?:%s)|((?:%s)+))\s*\\)'
% (i_string, _orRule('[!#$%&*-~]', i_nonascii, i_escape)))
# XXX For now
# i_uri = '(url\\(.*?\\))'
re_uri = re.compile(i_uri, _reflags)
i_num = '(([-+]?[0-9]+(?:\\.[0-9]+)?)|([-+]?\\.[0-9]+))' # XXX Added out paranthesis, because e.g. .5em was not parsed correctly
re_num = re.compile(i_num, _reflags)
i_unit = '(%%|%s)?' % i_ident
re_unit = re.compile(i_unit, _reflags)
i_function = i_ident + '\\('
re_function = re.compile(i_function, _reflags)
i_functionterm = '[-+]?' + i_function
re_functionterm = re.compile(i_functionterm, _reflags)
i_unicoderange1 = "(?:U\\+%s{1,6}-%s{1,6})" % (i_hex, i_hex)
i_unicoderange2 = "(?:U\\+\?{1,6}|{h}(\?{0,5}|{h}(\?{0,4}|{h}(\?{0,3}|{h}(\?{0,2}|{h}(\??|{h}))))))"
i_unicoderange = i_unicoderange1 # '(%s|%s)' % (i_unicoderange1, i_unicoderange2)
re_unicoderange = re.compile(i_unicoderange, _reflags)
# i_comment = '(?:\/\*[^*]*\*+([^/*][^*]*\*+)*\/)|(?://.*)'
# gabriel: only C convention for comments is allowed in CSS
i_comment = '(?:\/\*[^*]*\*+([^/*][^*]*\*+)*\/)'
re_comment = re.compile(i_comment, _reflags)
i_important = '!\s*(important)'
re_important = re.compile(i_important, _reflags)
del _orRule
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#~ Public
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def __init__(self, cssBuilder=None):
self.setCSSBuilder(cssBuilder)
#~ CSS Builder to delegate to ~~~~~~~~~~~~~~~~~~~~~~~~
def getCSSBuilder(self):
"""A concrete instance implementing CSSBuilderAbstract"""
return self._cssBuilder
def setCSSBuilder(self, cssBuilder):
"""A concrete instance implementing CSSBuilderAbstract"""
self._cssBuilder = cssBuilder
cssBuilder = property(getCSSBuilder, setCSSBuilder)
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#~ Public CSS Parsing API
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def parseFile(self, srcFile, closeFile=False):
"""Parses CSS file-like objects using the current cssBuilder.
Use for external stylesheets."""
try:
result = self.parse(srcFile.read())
finally:
if closeFile:
srcFile.close()
return result
def parse(self, src):
"""Parses CSS string source using the current cssBuilder.
Use for embedded stylesheets."""
self.cssBuilder.beginStylesheet()
try:
# XXX Some simple preprocessing
src = cssSpecial.cleanupCSS(src)
try:
src, stylesheet = self._parseStylesheet(src)
except self.ParseError as err:
err.setFullCSSSource(src)
raise
finally:
self.cssBuilder.endStylesheet()
return stylesheet
def parseInline(self, src):
"""Parses CSS inline source string using the current cssBuilder.
Use to parse a tag's 'sytle'-like attribute."""
self.cssBuilder.beginInline()
try:
try:
src, properties = self._parseDeclarationGroup(src.strip(), braces=False)
except self.ParseError as err:
err.setFullCSSSource(src, inline=True)
raise
result = self.cssBuilder.inline(properties)
finally:
self.cssBuilder.endInline()
return result
def parseAttributes(self, attributes=None, **kwAttributes):
"""Parses CSS attribute source strings, and return as an inline stylesheet.
Use to parse a tag's highly CSS-based attributes like 'font'.
See also: parseSingleAttr
"""
attributes = attributes if attributes is not None else {}
if attributes:
kwAttributes.update(attributes)
self.cssBuilder.beginInline()
try:
properties = []
try:
for propertyName, src in six.iteritems(kwAttributes):
src, property = self._parseDeclarationProperty(src.strip(), propertyName)
properties.append(property)
except self.ParseError as err:
err.setFullCSSSource(src, inline=True)
raise
result = self.cssBuilder.inline(properties)
finally:
self.cssBuilder.endInline()
return result
def parseSingleAttr(self, attrValue):
"""Parse a single CSS attribute source string, and returns the built CSS expression.
Use to parse a tag's highly CSS-based attributes like 'font'.
See also: parseAttributes
"""
results = self.parseAttributes(temp=attrValue)
if 'temp' in results[1]:
return results[1]['temp']
else:
return results[0]['temp']
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#~ Internal _parse methods
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def _parseStylesheet(self, src):
"""stylesheet
: [ CHARSET_SYM S* STRING S* ';' ]?
[S|CDO|CDC]* [ import [S|CDO|CDC]* ]*
[ [ ruleset | media | page | font_face ] [S|CDO|CDC]* ]*
;
"""
# FIXME: BYTES to STR
if type(src) == six.binary_type:
src=six.text_type(src)
# Get rid of the comments
src = self.re_comment.sub('', src)
# [ CHARSET_SYM S* STRING S* ';' ]?
src = self._parseAtCharset(src)
# [S|CDO|CDC]*
src = self._parseSCDOCDC(src)
# [ import [S|CDO|CDC]* ]*
src, stylesheetImports = self._parseAtImports(src)
# [ namespace [S|CDO|CDC]* ]*
src = self._parseAtNamespace(src)
stylesheetElements = []
# [ [ ruleset | atkeywords ] [S|CDO|CDC]* ]*
while src: # due to ending with ]*
if src.startswith('@'):
# @media, @page, @font-face
src, atResults = self._parseAtKeyword(src)
if atResults is not None and atResults != NotImplemented:
stylesheetElements.extend(atResults)
else:
# ruleset
src, ruleset = self._parseRuleset(src)
stylesheetElements.append(ruleset)
# [S|CDO|CDC]*
src = self._parseSCDOCDC(src)
stylesheet = self.cssBuilder.stylesheet(stylesheetElements, stylesheetImports)
return src, stylesheet
def _parseSCDOCDC(self, src):
"""[S|CDO|CDC]*"""
while 1:
src = src.lstrip()
if src.startswith('<!--'):
src = src[4:]
elif src.startswith('-->'):
src = src[3:]
else:
break
return src
#~ CSS @ directives ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def _parseAtCharset(self, src):
"""[ CHARSET_SYM S* STRING S* ';' ]?"""
if isAtRuleIdent(src, 'charset'):
src = stripAtRuleIdent(src)
charset, src = self._getString(src)
src = src.lstrip()
if src[:1] != ';':
raise self.ParseError('@charset expected a terminating \';\'', src, self.ctxsrc)
src = src[1:].lstrip()
self.cssBuilder.atCharset(charset)
return src
def _parseAtImports(self, src):
"""[ import [S|CDO|CDC]* ]*"""
result = []
while isAtRuleIdent(src, 'import'):
ctxsrc = src
src = stripAtRuleIdent(src)
import_, src = self._getStringOrURI(src)
if import_ is None:
raise self.ParseError('Import expecting string or url', src, ctxsrc)
mediums = []
medium, src = self._getIdent(src.lstrip())
while medium is not None:
mediums.append(medium)
if src[:1] == ',':
src = src[1:].lstrip()
medium, src = self._getIdent(src)
else:
break
# XXX No medium inherits and then "all" is appropriate
if not mediums:
mediums = ["all"]
if src[:1] != ';':
raise self.ParseError('@import expected a terminating \';\'', src, ctxsrc)
src = src[1:].lstrip()
stylesheet = self.cssBuilder.atImport(import_, mediums, self)
if stylesheet is not None:
result.append(stylesheet)
src = self._parseSCDOCDC(src)
return src, result
def _parseAtNamespace(self, src):
"""namespace :
@namespace S* [IDENT S*]? [STRING|URI] S* ';' S*
"""
src = self._parseSCDOCDC(src)
while isAtRuleIdent(src, 'namespace'):
ctxsrc = src
src = stripAtRuleIdent(src)
namespace, src = self._getStringOrURI(src)
if namespace is None:
nsPrefix, src = self._getIdent(src)
if nsPrefix is None:
raise self.ParseError('@namespace expected an identifier or a URI', src, ctxsrc)
namespace, src = self._getStringOrURI(src.lstrip())
if namespace is None:
raise self.ParseError('@namespace expected a URI', src, ctxsrc)
else:
nsPrefix = None
src = src.lstrip()
if src[:1] != ';':
raise self.ParseError('@namespace expected a terminating \';\'', src, ctxsrc)
src = src[1:].lstrip()
self.cssBuilder.atNamespace(nsPrefix, namespace)
src = self._parseSCDOCDC(src)
return src
def _parseAtKeyword(self, src):
"""[media | page | font_face | unknown_keyword]"""
ctxsrc = src
if isAtRuleIdent(src, 'media'):
src, result = self._parseAtMedia(src)
elif isAtRuleIdent(src, 'page'):
src, result = self._parseAtPage(src)
elif isAtRuleIdent(src, 'font-face'):
src, result = self._parseAtFontFace(src)
# XXX added @import, was missing!
elif isAtRuleIdent(src, 'import'):
src, result = self._parseAtImports(src)
elif isAtRuleIdent(src, 'frame'):
src, result = self._parseAtFrame(src)
elif src.startswith('@'):
src, result = self._parseAtIdent(src)
else:
raise self.ParseError('Unknown state in atKeyword', src, ctxsrc)
return src, result
def _parseAtMedia(self, src):
"""media
: MEDIA_SYM S* medium [ ',' S* medium ]* '{' S* ruleset* '}' S*
;
"""
ctxsrc = src
src = src[len('@media '):].lstrip()
mediums = []
while src and src[0] != '{':
medium, src = self._getIdent(src)
if medium is None:
raise self.ParseError('@media rule expected media identifier', src, ctxsrc)
# make "and ... {" work
if medium == 'and':
# strip up to curly bracket
pattern = re.compile('.*({.*)')
match = re.match(pattern, src)
src = src[match.end()-1:]
break
mediums.append(medium)
if src[0] == ',':
src = src[1:].lstrip()
else:
src = src.lstrip()
if not src.startswith('{'):
raise self.ParseError('Ruleset opening \'{\' not found', src, ctxsrc)
src = src[1:].lstrip()
stylesheetElements = []
#while src and not src.startswith('}'):
# src, ruleset = self._parseRuleset(src)
# stylesheetElements.append(ruleset)
# src = src.lstrip()
# Containing @ where not found and parsed
while src and not src.startswith('}'):
if src.startswith('@'):
# @media, @page, @font-face
src, atResults = self._parseAtKeyword(src)
if atResults is not None:
stylesheetElements.extend(atResults)
else:
# ruleset
src, ruleset = self._parseRuleset(src)
stylesheetElements.append(ruleset)
src = src.lstrip()
if not src.startswith('}'):
raise self.ParseError('Ruleset closing \'}\' not found', src, ctxsrc)
else:
src = src[1:].lstrip()
result = self.cssBuilder.atMedia(mediums, stylesheetElements)
return src, result
def _parseAtPage(self, src):
"""page
: PAGE_SYM S* IDENT? pseudo_page? S*
'{' S* declaration [ ';' S* declaration ]* '}' S*
;
"""
ctxsrc = src
src = src[len('@page'):].lstrip()
page, src = self._getIdent(src)
if src[:1] == ':':
pseudopage, src = self._getIdent(src[1:])
page = page + '_' + pseudopage
else:
pseudopage = None
#src, properties = self._parseDeclarationGroup(src.lstrip())
# Containing @ where not found and parsed
stylesheetElements = []
src = src.lstrip()
properties = []
# XXX Extended for PDF use
if not src.startswith('{'):
raise self.ParseError('Ruleset opening \'{\' not found', src, ctxsrc)
else:
src = src[1:].lstrip()
while src and not src.startswith('}'):
if src.startswith('@'):
# @media, @page, @font-face
src, atResults = self._parseAtKeyword(src)
if atResults is not None:
stylesheetElements.extend(atResults)
else:
src, nproperties = self._parseDeclarationGroup(src.lstrip(), braces=False)
properties += nproperties
src = src.lstrip()
result = [self.cssBuilder.atPage(page, pseudopage, properties)]
return src[1:].lstrip(), result
def _parseAtFrame(self, src):
"""
XXX Proprietary for PDF
"""
src = src[len('@frame '):].lstrip()
box, src = self._getIdent(src)
src, properties = self._parseDeclarationGroup(src.lstrip())
result = [self.cssBuilder.atFrame(box, properties)]
return src.lstrip(), result
def _parseAtFontFace(self, src):
src = src[len('@font-face '):].lstrip()
src, properties = self._parseDeclarationGroup(src)
result = [self.cssBuilder.atFontFace(properties)]
return src, result
def _parseAtIdent(self, src):
ctxsrc = src
atIdent, src = self._getIdent(src[1:])
if atIdent is None:
raise self.ParseError('At-rule expected an identifier for the rule', src, ctxsrc)
src, result = self.cssBuilder.atIdent(atIdent, self, src)
if result is NotImplemented:
# An at-rule consists of everything up to and including the next semicolon (;) or the next block, whichever comes first
semiIdx = src.find(';')
if semiIdx < 0:
semiIdx = None
blockIdx = src[:semiIdx].find('{')
if blockIdx < 0:
blockIdx = None
if semiIdx is not None and semiIdx < blockIdx:
src = src[semiIdx + 1:].lstrip()
elif blockIdx is None:
# consume the rest of the content since we didn't find a block or a semicolon
src = src[-1:-1]
elif blockIdx is not None:
# expecing a block...
src = src[blockIdx:]
try:
# try to parse it as a declarations block
src, declarations = self._parseDeclarationGroup(src)
except self.ParseError:
# try to parse it as a stylesheet block
src, stylesheet = self._parseStylesheet(src)
else:
raise self.ParserError('Unable to ignore @-rule block', src, ctxsrc)
return src.lstrip(), result
#~ ruleset - see selector and declaration groups ~~~~
def _parseRuleset(self, src):
"""ruleset
: selector [ ',' S* selector ]*
'{' S* declaration [ ';' S* declaration ]* '}' S*
;
"""
src, selectors = self._parseSelectorGroup(src)
src, properties = self._parseDeclarationGroup(src.lstrip())
result = self.cssBuilder.ruleset(selectors, properties)
return src, result
#~ selector parsing ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def _parseSelectorGroup(self, src):
selectors = []
while src[:1] not in ('{', '}', ']', '(', ')', ';', ''):
src, selector = self._parseSelector(src)
if selector is None:
break
selectors.append(selector)
if src.startswith(','):
src = src[1:].lstrip()
return src, selectors
def _parseSelector(self, src):
"""selector
: simple_selector [ combinator simple_selector ]*
;
"""
src, selector = self._parseSimpleSelector(src)
srcLen = len(src) # XXX
while src[:1] not in ('', ',', ';', '{', '}', '[', ']', '(', ')'):
for combiner in self.SelectorCombiners:
if src.startswith(combiner):
src = src[len(combiner):].lstrip()
break
else:
combiner = ' '
src, selectorB = self._parseSimpleSelector(src)
# XXX Fix a bug that occured here e.g. : .1 {...}
if len(src) >= srcLen:
src = src[1:]
while src and (src[:1] not in ('', ',', ';', '{', '}', '[', ']', '(', ')')):
src = src[1:]
return src.lstrip(), None
selector = self.cssBuilder.combineSelectors(selector, combiner, selectorB)
return src.lstrip(), selector
def _parseSimpleSelector(self, src):
"""simple_selector
: [ namespace_selector ]? element_name? [ HASH | class | attrib | pseudo ]* S*
;
"""
ctxsrc = src.lstrip()
nsPrefix, src = self._getMatchResult(self.re_namespace_selector, src)
name, src = self._getMatchResult(self.re_element_name, src)
if name:
pass # already *successfully* assigned
elif src[:1] in self.SelectorQualifiers:
name = '*'
else:
raise self.ParseError('Selector name or qualifier expected', src, ctxsrc)
name = self.cssBuilder.resolveNamespacePrefix(nsPrefix, name)
selector = self.cssBuilder.selector(name)
while src and src[:1] in self.SelectorQualifiers:
hash_, src = self._getMatchResult(self.re_hash, src)
if hash_ is not None:
selector.addHashId(hash_)
continue
class_, src = self._getMatchResult(self.re_class, src)
if class_ is not None:
selector.addClass(class_)
continue
if src.startswith('['):
src, selector = self._parseSelectorAttribute(src, selector)
elif src.startswith(':'):
src, selector = self._parseSelectorPseudo(src, selector)
else:
break
return src.lstrip(), selector
def _parseSelectorAttribute(self, src, selector):
"""attrib
: '[' S* [ namespace_selector ]? IDENT S* [ [ '=' | INCLUDES | DASHMATCH ] S*
[ IDENT | STRING ] S* ]? ']'
;
"""
ctxsrc = src
if not src.startswith('['):
raise self.ParseError('Selector Attribute opening \'[\' not found', src, ctxsrc)
src = src[1:].lstrip()
nsPrefix, src = self._getMatchResult(self.re_namespace_selector, src)
attrName, src = self._getIdent(src)
src = src.lstrip()
if attrName is None:
raise self.ParseError('Expected a selector attribute name', src, ctxsrc)
if nsPrefix is not None:
attrName = self.cssBuilder.resolveNamespacePrefix(nsPrefix, attrName)
for op in self.AttributeOperators:
if src.startswith(op):
break
else:
op = ''
src = src[len(op):].lstrip()
if op:
attrValue, src = self._getIdent(src)
if attrValue is None:
attrValue, src = self._getString(src)
if attrValue is None:
raise self.ParseError('Expected a selector attribute value', src, ctxsrc)
else:
attrValue = None
if not src.startswith(']'):
raise self.ParseError('Selector Attribute closing \']\' not found', src, ctxsrc)
else:
src = src[1:]
if op:
selector.addAttributeOperation(attrName, op, attrValue)
else:
selector.addAttribute(attrName)
return src, selector
def _parseSelectorPseudo(self, src, selector):
"""pseudo
: ':' [ IDENT | function ]
;
"""
ctxsrc = src
if not src.startswith(':'):
raise self.ParseError('Selector Pseudo \':\' not found', src, ctxsrc)
src = re.search('^:{1,2}(.*)', src, re.M | re.S).group(1)
name, src = self._getIdent(src)
if not name:
raise self.ParseError('Selector Pseudo identifier not found', src, ctxsrc)
if src.startswith('('):
# function
src = src[1:].lstrip()
src, term = self._parseExpression(src, True)
if not src.startswith(')'):
raise self.ParseError('Selector Pseudo Function closing \')\' not found', src, ctxsrc)
src = src[1:]
selector.addPseudoFunction(name, term)
else:
selector.addPseudo(name)
return src, selector
#~ declaration and expression parsing ~~~~~~~~~~~~~~~
def _parseDeclarationGroup(self, src, braces=True):
ctxsrc = src
if src.startswith('{'):
src, braces = src[1:], True
elif braces:
raise self.ParseError('Declaration group opening \'{\' not found', src, ctxsrc)
properties = []
src = src.lstrip()
while src[:1] not in ('', ',', '{', '}', '[', ']', '(', ')', '@'): # XXX @?
src, property = self._parseDeclaration(src)
# XXX Workaround for styles like "*font: smaller"
if src.startswith("*"):
src = "-nothing-" + src[1:]
continue
if property is None:
src = src[1:].lstrip()
break
properties.append(property)
if src.startswith(';'):
src = src[1:].lstrip()
else:
break
if braces:
if not src.startswith('}'):
raise self.ParseError('Declaration group closing \'}\' not found', src, ctxsrc)
src = src[1:]
return src.lstrip(), properties
def _parseDeclaration(self, src):
"""declaration
: ident S* ':' S* expr prio?
| /* empty */
;
"""
# property
propertyName, src = self._getIdent(src)
if propertyName is not None:
src = src.lstrip()
# S* : S*
if src[:1] in (':', '='):
# Note: we are being fairly flexable here... technically, the
# ":" is *required*, but in the name of flexibility we
# suppor a null transition, as well as an "=" transition
src = src[1:].lstrip()
src, property = self._parseDeclarationProperty(src, propertyName)
else:
property = None
return src, property
def _parseDeclarationProperty(self, src, propertyName):
# expr
src, expr = self._parseExpression(src)
# prio?
important, src = self._getMatchResult(self.re_important, src)
src = src.lstrip()
property = self.cssBuilder.property(propertyName, expr, important)
return src, property
def _parseExpression(self, src, returnList=False):
"""
expr
: term [ operator term ]*
;
"""
src, term = self._parseExpressionTerm(src)
operator = None
while src[:1] not in ('', ';', '{', '}', '[', ']', ')'):
for operator in self.ExpressionOperators:
if src.startswith(operator):
src = src[len(operator):]
break
else:
operator = ' '
src, term2 = self._parseExpressionTerm(src.lstrip())
if term2 is NotImplemented:
break
else:
term = self.cssBuilder.combineTerms(term, operator, term2)
if operator is None and returnList:
term = self.cssBuilder.combineTerms(term, None, None)
return src, term
else:
return src, term
def _parseExpressionTerm(self, src):
"""term
: unary_operator?
[ NUMBER S* | PERCENTAGE S* | LENGTH S* | EMS S* | EXS S* | ANGLE S* |
TIME S* | FREQ S* | function ]
| STRING S* | IDENT S* | URI S* | RGB S* | UNICODERANGE S* | hexcolor
;
"""
ctxsrc = src
result, src = self._getMatchResult(self.re_num, src)
if result is not None:
units, src = self._getMatchResult(self.re_unit, src)
term = self.cssBuilder.termNumber(result, units)
return src.lstrip(), term
result, src = self._getString(src, self.re_uri)
if result is not None:
# XXX URL!!!!
term = self.cssBuilder.termURI(result)
return src.lstrip(), term
result, src = self._getString(src)
if result is not None:
term = self.cssBuilder.termString(result)
return src.lstrip(), term
result, src = self._getMatchResult(self.re_functionterm, src)
if result is not None:
src, params = self._parseExpression(src, True)
if src[0] != ')':
raise self.ParseError('Terminal function expression expected closing \')\'', src, ctxsrc)
src = src[1:].lstrip()
term = self.cssBuilder.termFunction(result, params)
return src, term
result, src = self._getMatchResult(self.re_rgbcolor, src)
if result is not None:
term = self.cssBuilder.termRGB(result)
return src.lstrip(), term
result, src = self._getMatchResult(self.re_unicoderange, src)
if result is not None:
term = self.cssBuilder.termUnicodeRange(result)
return src.lstrip(), term
nsPrefix, src = self._getMatchResult(self.re_namespace_selector, src)
result, src = self._getIdent(src)
if result is not None:
if nsPrefix is not None:
result = self.cssBuilder.resolveNamespacePrefix(nsPrefix, result)
term = self.cssBuilder.termIdent(result)
return src.lstrip(), term
result, src = self._getMatchResult(self.re_unicodeid, src)
if result is not None:
term = self.cssBuilder.termIdent(result)
return src.lstrip(), term
result, src = self._getMatchResult(self.re_unicodestr, src)
if result is not None:
term = self.cssBuilder.termString(result)
return src.lstrip(), term
return self.cssBuilder.termUnknown(src)
#~ utility methods ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def _getIdent(self, src, default=None):
return self._getMatchResult(self.re_ident, src, default)
def _getString(self, src, rexpression=None, default=None):
if rexpression is None:
rexpression = self.re_string
result = rexpression.match(src)
if result:
strres = tuple(filter(None, result.groups()))
if strres:
try:
strres = strres[0]
except Exception:
strres = result.groups()[0]
else:
strres = ''
return strres, src[result.end():]
else:
return default, src
def _getStringOrURI(self, src):
result, src = self._getString(src, self.re_uri)
if result is None:
result, src = self._getString(src)
return result, src
def _getMatchResult(self, rexpression, src, default=None, group=1):
result = rexpression.match(src)
if result:
return result.group(group), src[result.end():]
else:
return default, src
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