/usr/lib/python2.7/dist-packages/cairosvg/css.py is in python-cairosvg 1.0.9-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | # -*- coding: utf-8 -*-
# This file is part of CairoSVG
# Copyright © 2010-2012 Kozea
#
# This library is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with CairoSVG. If not, see <http://www.gnu.org/licenses/>.
"""
Optionally handle CSS stylesheets.
"""
import os
from .parser import HAS_LXML
# Detect optional depedencies
# pylint: disable=W0611
try:
import tinycss
import cssselect
CSS_CAPABLE = HAS_LXML
except ImportError:
CSS_CAPABLE = False
# pylint: enable=W0611
# Python 2/3 compat
iteritems = getattr(dict, "iteritems", dict.items) # pylint: disable=C0103
def find_stylesheets(tree, url):
"""Find the stylesheets included in ``tree``."""
# TODO: support contentStyleType on <svg>
default_type = "text/css"
process = tree.getprevious()
while process is not None:
if (getattr(process, "target", None) == "xml-stylesheet" and
process.attrib.get("type", default_type) == "text/css"):
# TODO: handle web URLs
filename = process.attrib.get("href")
if filename:
path = os.path.join(os.path.dirname(url), filename)
if os.path.isfile(path):
yield tinycss.make_parser().parse_stylesheet_file(path)
process = process.getprevious()
for element in tree.iter():
# http://www.w3.org/TR/SVG/styling.html#StyleElement
if (element.tag == "style"
and element.get("type", default_type) == "text/css"
and element.text):
# TODO: pass href for relative URLs
# TODO: support media types
# TODO: what if <style> has children elements?
yield tinycss.make_parser().parse_stylesheet(element.text)
def find_stylesheets_rules(stylesheet, url):
"""Find the rules in a stylesheet."""
for rule in stylesheet.rules:
if isinstance(rule, tinycss.css21.ImportRule):
css_path = os.path.normpath(
os.path.join(os.path.dirname(url), rule.uri))
if not os.path.exists(css_path):
continue
with open(css_path) as f:
stylesheet = tinycss.make_parser().parse_stylesheet(f.read())
for rule in find_stylesheets_rules(stylesheet, css_path):
yield rule
if not rule.at_keyword:
yield rule
def find_style_rules(tree):
"""Find the style rules in ``tree``."""
for stylesheet in find_stylesheets(tree.xml_tree, tree.url):
# TODO: warn for each stylesheet.errors
for rule in find_stylesheets_rules(stylesheet, tree.url):
yield rule
def get_declarations(rule):
"""Get the declarations in ``rule``."""
for declaration in rule.declarations:
if declaration.name.startswith("-"):
# Ignore properties prefixed by "-"
continue
# TODO: filter out invalid values
yield (
declaration.name,
declaration.value.as_css(),
bool(declaration.priority))
def match_selector(rule, tree):
"""Yield the ``(element, specificity)`` in ``tree`` matching ``rule``."""
selector_list = cssselect.parse(rule.selector.as_css())
translator = cssselect.GenericTranslator()
for selector in selector_list:
if not selector.pseudo_element:
specificity = selector.specificity()
for element in tree.xpath(translator.selector_to_xpath(selector)):
yield element, specificity
def apply_stylesheets(tree):
"""Apply the stylesheet in ``tree`` to ``tree``."""
if not CSS_CAPABLE:
# TODO: warn?
return
style_by_element = {}
for rule in find_style_rules(tree):
declarations = list(get_declarations(rule))
for element, specificity in match_selector(rule, tree.xml_tree):
style = style_by_element.setdefault(element, {})
for name, value, important in declarations:
weight = important, specificity
if name in style:
_old_value, old_weight = style[name]
if old_weight > weight:
continue
style[name] = value, weight
for element, style in iteritems(style_by_element):
values = ["%s: %s" % (name, value)
for name, (value, weight) in iteritems(style)]
element.set("_style", ";".join(values))
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