/usr/lib/python2.7/dist-packages/cairosvg/parser.py is in python-cairosvg 1.0.20-1.
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# 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/>.
"""
SVG Parser.
"""
# Fallbacks for Python 2/3 and lxml/ElementTree
# pylint: disable=E0611,F0401,W0611
try:
import lxml.etree as ElementTree
from lxml.etree import XMLSyntaxError as ParseError
HAS_LXML = True
except ImportError:
from xml.etree import ElementTree
from xml.parsers import expat
# ElementTree's API changed between 2.6 and 2.7
# pylint: disable=C0103
ParseError = getattr(ElementTree, 'ParseError', expat.ExpatError)
# pylint: enable=C0103
HAS_LXML = False
try:
from urllib import urlopen
import urlparse
except ImportError:
from urllib.request import urlopen
from urllib import parse as urlparse # Python 3
# pylint: enable=E0611,F0401,W0611
import re
import gzip
import random
import os.path
from .css import apply_stylesheets
from .features import match_features
from .surface.helpers import urls, rotations, pop_rotation, flatten
# Python 2/3 compat
# pylint: disable=C0103,W0622
try:
basestring
except NameError:
basestring = str
# pylint: enable=C0103,W0622
def remove_svg_namespace(tree):
"""Remove the SVG namespace from ``tree`` tags.
``lxml.cssselect`` does not support empty/default namespaces, so remove any
SVG namespace.
"""
prefix = "{http://www.w3.org/2000/svg}"
prefix_len = len(prefix)
iterator = (
tree.iter() if hasattr(tree, 'iter')
else tree.getiterator())
for element in iterator:
tag = element.tag
if hasattr(tag, "startswith") and tag.startswith(prefix):
element.tag = tag[prefix_len:]
def handle_white_spaces(string, preserve):
"""Handle white spaces in text nodes."""
# http://www.w3.org/TR/SVG/text.html#WhiteSpace
if not string:
return ""
if preserve:
string = re.sub("[\n\r\t]", " ", string)
else:
string = re.sub("[\n\r]", "", string)
string = re.sub("\t", " ", string)
string = re.sub(" +", " ", string)
return string
NOT_INHERITED_ATTRS = frozenset([
"transform", "opacity", "style", "viewBox", "stop-color",
"stop-opacity", "width", "height", "filter", "mask", "rotate",
"{http://www.w3.org/1999/xlink}href", "id", "x", "y",
"overflow", "clip", "clip-path",
])
class Node(dict):
"""SVG node with dict-like properties and children."""
def __init__(self, node, parent=None, parent_children=False, url=None,
__not_inherited_attrs=NOT_INHERITED_ATTRS):
"""Create the Node from ElementTree ``node``, with ``parent`` Node."""
self.children = ()
self.root = False
self.tag = node.tag
self.text = node.text
self.node = node
# Inherits from parent properties
if parent is not None:
self.update([
(a, parent[a]) for a in parent
if a not in __not_inherited_attrs
])
self.url = url or parent.url
self.parent = parent
else:
self.url = getattr(self, "url", None)
self.parent = getattr(self, "parent", None)
self.update(self.node.attrib)
# Give an id for nodes that don't have one
if "id" not in self:
self["id"] = "node_%s_%x" %(id(self), random.getrandbits(32))
# Handle the CSS
style = self.pop("_style", "") + ";" + self.pop("style", "").lower()
for declaration in style.split(";"):
name, colon, value = declaration.partition(":")
if not colon:
continue
self[name.strip()] = value.strip()
# Replace currentColor by a real color value
color_attributes = (
"fill", "stroke", "stop-color", "flood-color",
"lighting-color")
for attribute in color_attributes:
if self.get(attribute) == "currentColor":
self[attribute] = self.get("color", "black")
# Replace inherit by the parent value
for attribute in [k for k in self if self[k] == "inherit"]:
if parent is not None and attribute in parent:
self[attribute] = parent.get(attribute)
else:
del self[attribute]
# Manage text by creating children
if self.tag in ("text", "textPath", "a"):
self.children, _ = self.text_children(node, True, True)
if parent_children:
self.children = [Node(child.node, parent=self)
for child in parent.children]
elif not self.children:
self.children = []
for child in node:
if isinstance(child.tag, basestring):
if match_features(child):
self.children.append(Node(child, self))
if self.tag == "switch":
break
def text_children(self, node, trailing_space, text_root=False):
"""Create children and return them."""
children = []
space = "{http://www.w3.org/XML/1998/namespace}space"
preserve = self.get(space) == "preserve"
self.text = handle_white_spaces(node.text, preserve)
if trailing_space and not preserve:
self.text = self.text.lstrip(" ")
original_rotate = rotations(self)
rotate = list(original_rotate)
if original_rotate:
pop_rotation(self, original_rotate, rotate)
if self.text:
trailing_space = self.text.endswith(" ")
for child in node:
if child.tag == "tref":
href = child.get("{http://www.w3.org/1999/xlink}href")
tree_urls = urls(href)
url = tree_urls[0] if tree_urls else None
child_tree = Tree(url=url, parent=self)
child_tree.clear()
child_tree.update(self)
child_node = Node(
child, parent=child_tree, parent_children=True)
child_node.tag = "tspan"
# Retrieve the referenced node and get its flattened text
# and remove the node children.
child = child_tree.xml_tree
child.text = flatten(child)
else:
child_node = Node(child, parent=self)
child_preserve = child_node.get(space) == "preserve"
child_node.text = handle_white_spaces(child.text, child_preserve)
child_node.children, trailing_space = \
child_node.text_children(child, trailing_space)
trailing_space = child_node.text.endswith(" ")
if original_rotate and "rotate" not in child_node:
pop_rotation(child_node, original_rotate, rotate)
children.append(child_node)
if child.tail:
anonymous = Node(ElementTree.Element("tspan"), parent=self)
anonymous.text = handle_white_spaces(child.tail, preserve)
if original_rotate:
pop_rotation(anonymous, original_rotate, rotate)
if trailing_space and not preserve:
anonymous.text = anonymous.text.lstrip(" ")
if anonymous.text:
trailing_space = anonymous.text.endswith(" ")
children.append(anonymous)
if text_root and not children and not preserve:
self.text = self.text.rstrip(" ")
return children, trailing_space
class Tree(Node):
"""SVG tree."""
def __new__(cls, **kwargs):
tree_cache = kwargs.get("tree_cache")
if tree_cache:
if "url" in kwargs:
url_parts = kwargs["url"].split("#", 1)
if len(url_parts) == 2:
url, element_id = url_parts
else:
url, element_id = url_parts[0], None
parent = kwargs.get("parent")
if parent and not url:
url = parent.url
if (url, element_id) in tree_cache:
cached_tree = tree_cache[(url, element_id)]
new_tree = Node(cached_tree.xml_tree, parent)
new_tree.xml_tree = cached_tree.xml_tree
new_tree.url = url
new_tree.tag = cached_tree.tag
new_tree.root = True
return new_tree
return dict.__new__(cls)
def __init__(self, **kwargs):
"""Create the Tree from SVG ``text``."""
if getattr(self, "xml_tree", None) is not None:
# The tree has already been parsed
return
# Make the parameters keyword-only:
bytestring = kwargs.pop("bytestring", None)
file_obj = kwargs.pop("file_obj", None)
url = kwargs.pop("url", None)
parent = kwargs.pop("parent", None)
parent_children = kwargs.pop("parent_children", None)
tree_cache = kwargs.pop("tree_cache", None)
element_id = None
if bytestring is not None:
tree = ElementTree.fromstring(bytestring)
self.url = url
elif file_obj is not None:
tree = ElementTree.parse(file_obj).getroot()
if url:
self.url = url
else:
self.url = getattr(file_obj, "name", None)
elif url is not None:
if "#" in url:
url, element_id = url.split("#", 1)
else:
element_id = None
if parent and parent.url:
if url:
url = urlparse.urljoin(parent.url, url)
elif element_id:
url = parent.url
self.url = url
if url:
if url[1:3] == ":\\":
input_ = url # win absolute filename
elif urlparse.urlparse(url).scheme:
input_ = urlopen(url)
else:
input_ = url # filename
if os.path.splitext(url)[1].lower() == "svgz":
input_ = gzip.open(url)
tree = ElementTree.parse(input_).getroot()
else:
root_parent = parent
while root_parent.parent:
root_parent = root_parent.parent
tree = root_parent.xml_tree
else:
raise TypeError(
"No input. Use one of bytestring, file_obj or url.")
remove_svg_namespace(tree)
self.xml_tree = tree
apply_stylesheets(self)
if element_id:
iterator = (
tree.iter() if hasattr(tree, "iter")
else tree.getiterator())
for element in iterator:
if element.get("id") == element_id:
self.xml_tree = element
break
else:
raise TypeError(
'No tag with id="%s" found.' % element_id)
super(Tree, self).__init__(self.xml_tree, parent, parent_children, url)
self.root = True
if tree_cache is not None and url is not None:
tree_cache[(self.url, self["id"])] = self
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