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scour.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Scour
#
# Copyright 2010 Jeff Schiller
# Copyright 2010 Louis Simard
# Copyright 2013-2014 Tavendo GmbH
#
# This file is part of Scour, http://www.codedread.com/scour/
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Notes:
# rubys' path-crunching ideas here: http://intertwingly.net/code/svgtidy/spec.rb
# (and implemented here: http://intertwingly.net/code/svgtidy/svgtidy.rb )
# Yet more ideas here: http://wiki.inkscape.org/wiki/index.php/Save_Cleaned_SVG
#
# * Process Transformations
# * Collapse all group based transformations
# Even more ideas here: http://esw.w3.org/topic/SvgTidy
# * analysis of path elements to see if rect can be used instead?
# (must also need to look at rounded corners)
# Next Up:
# - why are marker-start, -end not removed from the style attribute?
# - why are only overflow style properties considered and not attributes?
# - only remove unreferenced elements if they are not children of a referenced element
# - add an option to remove ids if they match the Inkscape-style of IDs
# - investigate point-reducing algorithms
# - parse transform attribute
# - if a <g> has only one element in it, collapse the <g> (ensure transform, etc are carried down)
from __future__ import division # use "true" division instead of integer division in Python 2 (see PEP 238)
from __future__ import print_function # use print() as a function in Python 2 (see PEP 3105)
from __future__ import absolute_import # use absolute imports by default in Python 2 (see PEP 328)
import math
import optparse
import os
import re
import sys
import time
import xml.dom.minidom
from collections import namedtuple
from decimal import Context, Decimal, InvalidOperation, getcontext
import six
from six.moves import range, urllib
from scour.svg_regex import svg_parser
from scour.svg_transform import svg_transform_parser
from scour.yocto_css import parseCssString
from scour import __version__
APP = u'scour'
VER = __version__
COPYRIGHT = u'Copyright Jeff Schiller, Louis Simard, 2010'
# select the most precise walltime measurement function available on the platform
if sys.platform.startswith('win'):
walltime = time.clock
else:
walltime = time.time
NS = {'SVG': 'http://www.w3.org/2000/svg',
'XLINK': 'http://www.w3.org/1999/xlink',
'SODIPODI': 'http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd',
'INKSCAPE': 'http://www.inkscape.org/namespaces/inkscape',
'ADOBE_ILLUSTRATOR': 'http://ns.adobe.com/AdobeIllustrator/10.0/',
'ADOBE_GRAPHS': 'http://ns.adobe.com/Graphs/1.0/',
'ADOBE_SVG_VIEWER': 'http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/',
'ADOBE_VARIABLES': 'http://ns.adobe.com/Variables/1.0/',
'ADOBE_SFW': 'http://ns.adobe.com/SaveForWeb/1.0/',
'ADOBE_EXTENSIBILITY': 'http://ns.adobe.com/Extensibility/1.0/',
'ADOBE_FLOWS': 'http://ns.adobe.com/Flows/1.0/',
'ADOBE_IMAGE_REPLACEMENT': 'http://ns.adobe.com/ImageReplacement/1.0/',
'ADOBE_CUSTOM': 'http://ns.adobe.com/GenericCustomNamespace/1.0/',
'ADOBE_XPATH': 'http://ns.adobe.com/XPath/1.0/',
'SKETCH': 'http://www.bohemiancoding.com/sketch/ns'
}
unwanted_ns = [NS['SODIPODI'], NS['INKSCAPE'], NS['ADOBE_ILLUSTRATOR'],
NS['ADOBE_GRAPHS'], NS['ADOBE_SVG_VIEWER'], NS['ADOBE_VARIABLES'],
NS['ADOBE_SFW'], NS['ADOBE_EXTENSIBILITY'], NS['ADOBE_FLOWS'],
NS['ADOBE_IMAGE_REPLACEMENT'], NS['ADOBE_CUSTOM'],
NS['ADOBE_XPATH'], NS['SKETCH']]
# A list of all SVG presentation properties
#
# Sources for this list:
# https://www.w3.org/TR/SVG/propidx.html (implemented)
# https://www.w3.org/TR/SVGTiny12/attributeTable.html (implemented)
# https://www.w3.org/TR/SVG2/propidx.html (not yet implemented)
#
svgAttributes = [
# SVG 1.1
'alignment-baseline',
'baseline-shift',
'clip',
'clip-path',
'clip-rule',
'color',
'color-interpolation',
'color-interpolation-filters',
'color-profile',
'color-rendering',
'cursor',
'direction',
'display',
'dominant-baseline',
'enable-background',
'fill',
'fill-opacity',
'fill-rule',
'filter',
'flood-color',
'flood-opacity',
'font',
'font-family',
'font-size',
'font-size-adjust',
'font-stretch',
'font-style',
'font-variant',
'font-weight',
'glyph-orientation-horizontal',
'glyph-orientation-vertical',
'image-rendering',
'kerning',
'letter-spacing',
'lighting-color',
'marker',
'marker-end',
'marker-mid',
'marker-start',
'mask',
'opacity',
'overflow',
'pointer-events',
'shape-rendering',
'stop-color',
'stop-opacity',
'stroke',
'stroke-dasharray',
'stroke-dashoffset',
'stroke-linecap',
'stroke-linejoin',
'stroke-miterlimit',
'stroke-opacity',
'stroke-width',
'text-anchor',
'text-decoration',
'text-rendering',
'unicode-bidi',
'visibility',
'word-spacing',
'writing-mode',
# SVG 1.2 Tiny
'audio-level',
'buffered-rendering',
'display-align',
'line-increment',
'solid-color',
'solid-opacity',
'text-align',
'vector-effect',
'viewport-fill',
'viewport-fill-opacity',
]
colors = {
'aliceblue': 'rgb(240, 248, 255)',
'antiquewhite': 'rgb(250, 235, 215)',
'aqua': 'rgb( 0, 255, 255)',
'aquamarine': 'rgb(127, 255, 212)',
'azure': 'rgb(240, 255, 255)',
'beige': 'rgb(245, 245, 220)',
'bisque': 'rgb(255, 228, 196)',
'black': 'rgb( 0, 0, 0)',
'blanchedalmond': 'rgb(255, 235, 205)',
'blue': 'rgb( 0, 0, 255)',
'blueviolet': 'rgb(138, 43, 226)',
'brown': 'rgb(165, 42, 42)',
'burlywood': 'rgb(222, 184, 135)',
'cadetblue': 'rgb( 95, 158, 160)',
'chartreuse': 'rgb(127, 255, 0)',
'chocolate': 'rgb(210, 105, 30)',
'coral': 'rgb(255, 127, 80)',
'cornflowerblue': 'rgb(100, 149, 237)',
'cornsilk': 'rgb(255, 248, 220)',
'crimson': 'rgb(220, 20, 60)',
'cyan': 'rgb( 0, 255, 255)',
'darkblue': 'rgb( 0, 0, 139)',
'darkcyan': 'rgb( 0, 139, 139)',
'darkgoldenrod': 'rgb(184, 134, 11)',
'darkgray': 'rgb(169, 169, 169)',
'darkgreen': 'rgb( 0, 100, 0)',
'darkgrey': 'rgb(169, 169, 169)',
'darkkhaki': 'rgb(189, 183, 107)',
'darkmagenta': 'rgb(139, 0, 139)',
'darkolivegreen': 'rgb( 85, 107, 47)',
'darkorange': 'rgb(255, 140, 0)',
'darkorchid': 'rgb(153, 50, 204)',
'darkred': 'rgb(139, 0, 0)',
'darksalmon': 'rgb(233, 150, 122)',
'darkseagreen': 'rgb(143, 188, 143)',
'darkslateblue': 'rgb( 72, 61, 139)',
'darkslategray': 'rgb( 47, 79, 79)',
'darkslategrey': 'rgb( 47, 79, 79)',
'darkturquoise': 'rgb( 0, 206, 209)',
'darkviolet': 'rgb(148, 0, 211)',
'deeppink': 'rgb(255, 20, 147)',
'deepskyblue': 'rgb( 0, 191, 255)',
'dimgray': 'rgb(105, 105, 105)',
'dimgrey': 'rgb(105, 105, 105)',
'dodgerblue': 'rgb( 30, 144, 255)',
'firebrick': 'rgb(178, 34, 34)',
'floralwhite': 'rgb(255, 250, 240)',
'forestgreen': 'rgb( 34, 139, 34)',
'fuchsia': 'rgb(255, 0, 255)',
'gainsboro': 'rgb(220, 220, 220)',
'ghostwhite': 'rgb(248, 248, 255)',
'gold': 'rgb(255, 215, 0)',
'goldenrod': 'rgb(218, 165, 32)',
'gray': 'rgb(128, 128, 128)',
'grey': 'rgb(128, 128, 128)',
'green': 'rgb( 0, 128, 0)',
'greenyellow': 'rgb(173, 255, 47)',
'honeydew': 'rgb(240, 255, 240)',
'hotpink': 'rgb(255, 105, 180)',
'indianred': 'rgb(205, 92, 92)',
'indigo': 'rgb( 75, 0, 130)',
'ivory': 'rgb(255, 255, 240)',
'khaki': 'rgb(240, 230, 140)',
'lavender': 'rgb(230, 230, 250)',
'lavenderblush': 'rgb(255, 240, 245)',
'lawngreen': 'rgb(124, 252, 0)',
'lemonchiffon': 'rgb(255, 250, 205)',
'lightblue': 'rgb(173, 216, 230)',
'lightcoral': 'rgb(240, 128, 128)',
'lightcyan': 'rgb(224, 255, 255)',
'lightgoldenrodyellow': 'rgb(250, 250, 210)',
'lightgray': 'rgb(211, 211, 211)',
'lightgreen': 'rgb(144, 238, 144)',
'lightgrey': 'rgb(211, 211, 211)',
'lightpink': 'rgb(255, 182, 193)',
'lightsalmon': 'rgb(255, 160, 122)',
'lightseagreen': 'rgb( 32, 178, 170)',
'lightskyblue': 'rgb(135, 206, 250)',
'lightslategray': 'rgb(119, 136, 153)',
'lightslategrey': 'rgb(119, 136, 153)',
'lightsteelblue': 'rgb(176, 196, 222)',
'lightyellow': 'rgb(255, 255, 224)',
'lime': 'rgb( 0, 255, 0)',
'limegreen': 'rgb( 50, 205, 50)',
'linen': 'rgb(250, 240, 230)',
'magenta': 'rgb(255, 0, 255)',
'maroon': 'rgb(128, 0, 0)',
'mediumaquamarine': 'rgb(102, 205, 170)',
'mediumblue': 'rgb( 0, 0, 205)',
'mediumorchid': 'rgb(186, 85, 211)',
'mediumpurple': 'rgb(147, 112, 219)',
'mediumseagreen': 'rgb( 60, 179, 113)',
'mediumslateblue': 'rgb(123, 104, 238)',
'mediumspringgreen': 'rgb( 0, 250, 154)',
'mediumturquoise': 'rgb( 72, 209, 204)',
'mediumvioletred': 'rgb(199, 21, 133)',
'midnightblue': 'rgb( 25, 25, 112)',
'mintcream': 'rgb(245, 255, 250)',
'mistyrose': 'rgb(255, 228, 225)',
'moccasin': 'rgb(255, 228, 181)',
'navajowhite': 'rgb(255, 222, 173)',
'navy': 'rgb( 0, 0, 128)',
'oldlace': 'rgb(253, 245, 230)',
'olive': 'rgb(128, 128, 0)',
'olivedrab': 'rgb(107, 142, 35)',
'orange': 'rgb(255, 165, 0)',
'orangered': 'rgb(255, 69, 0)',
'orchid': 'rgb(218, 112, 214)',
'palegoldenrod': 'rgb(238, 232, 170)',
'palegreen': 'rgb(152, 251, 152)',
'paleturquoise': 'rgb(175, 238, 238)',
'palevioletred': 'rgb(219, 112, 147)',
'papayawhip': 'rgb(255, 239, 213)',
'peachpuff': 'rgb(255, 218, 185)',
'peru': 'rgb(205, 133, 63)',
'pink': 'rgb(255, 192, 203)',
'plum': 'rgb(221, 160, 221)',
'powderblue': 'rgb(176, 224, 230)',
'purple': 'rgb(128, 0, 128)',
'red': 'rgb(255, 0, 0)',
'rosybrown': 'rgb(188, 143, 143)',
'royalblue': 'rgb( 65, 105, 225)',
'saddlebrown': 'rgb(139, 69, 19)',
'salmon': 'rgb(250, 128, 114)',
'sandybrown': 'rgb(244, 164, 96)',
'seagreen': 'rgb( 46, 139, 87)',
'seashell': 'rgb(255, 245, 238)',
'sienna': 'rgb(160, 82, 45)',
'silver': 'rgb(192, 192, 192)',
'skyblue': 'rgb(135, 206, 235)',
'slateblue': 'rgb(106, 90, 205)',
'slategray': 'rgb(112, 128, 144)',
'slategrey': 'rgb(112, 128, 144)',
'snow': 'rgb(255, 250, 250)',
'springgreen': 'rgb( 0, 255, 127)',
'steelblue': 'rgb( 70, 130, 180)',
'tan': 'rgb(210, 180, 140)',
'teal': 'rgb( 0, 128, 128)',
'thistle': 'rgb(216, 191, 216)',
'tomato': 'rgb(255, 99, 71)',
'turquoise': 'rgb( 64, 224, 208)',
'violet': 'rgb(238, 130, 238)',
'wheat': 'rgb(245, 222, 179)',
'white': 'rgb(255, 255, 255)',
'whitesmoke': 'rgb(245, 245, 245)',
'yellow': 'rgb(255, 255, 0)',
'yellowgreen': 'rgb(154, 205, 50)',
}
# A list of default poperties that are safe to remove
#
# Sources for this list:
# https://www.w3.org/TR/SVG/propidx.html (implemented)
# https://www.w3.org/TR/SVGTiny12/attributeTable.html (implemented)
# https://www.w3.org/TR/SVG2/propidx.html (not yet implemented)
#
default_properties = { # excluded all properties with 'auto' as default
# SVG 1.1 presentation attributes
'baseline-shift': 'baseline',
'clip-path': 'none',
'clip-rule': 'nonzero',
'color': '#000',
'color-interpolation-filters': 'linearRGB',
'color-interpolation': 'sRGB',
'direction': 'ltr',
'display': 'inline',
'enable-background': 'accumulate',
'fill': '#000',
'fill-opacity': '1',
'fill-rule': 'nonzero',
'filter': 'none',
'flood-color': '#000',
'flood-opacity': '1',
'font-size-adjust': 'none',
'font-size': 'medium',
'font-stretch': 'normal',
'font-style': 'normal',
'font-variant': 'normal',
'font-weight': 'normal',
'glyph-orientation-horizontal': '0deg',
'letter-spacing': 'normal',
'lighting-color': '#fff',
'marker': 'none',
'marker-start': 'none',
'marker-mid': 'none',
'marker-end': 'none',
'mask': 'none',
'opacity': '1',
'pointer-events': 'visiblePainted',
'stop-color': '#000',
'stop-opacity': '1',
'stroke': 'none',
'stroke-dasharray': 'none',
'stroke-dashoffset': '0',
'stroke-linecap': 'butt',
'stroke-linejoin': 'miter',
'stroke-miterlimit': '4',
'stroke-opacity': '1',
'stroke-width': '1',
'text-anchor': 'start',
'text-decoration': 'none',
'unicode-bidi': 'normal',
'visibility': 'visible',
'word-spacing': 'normal',
'writing-mode': 'lr-tb',
# SVG 1.2 tiny properties
'audio-level': '1',
'solid-color': '#000',
'solid-opacity': '1',
'text-align': 'start',
'vector-effect': 'none',
'viewport-fill': 'none',
'viewport-fill-opacity': '1',
}
def isSameSign(a, b): return (a <= 0 and b <= 0) or (a >= 0 and b >= 0)
scinumber = re.compile(r"[-+]?(\d*\.?)?\d+[eE][-+]?\d+")
number = re.compile(r"[-+]?(\d*\.?)?\d+")
sciExponent = re.compile(r"[eE]([-+]?\d+)")
unit = re.compile("(em|ex|px|pt|pc|cm|mm|in|%){1,1}$")
class Unit(object):
# Integer constants for units.
INVALID = -1
NONE = 0
PCT = 1
PX = 2
PT = 3
PC = 4
EM = 5
EX = 6
CM = 7
MM = 8
IN = 9
# String to Unit. Basically, converts unit strings to their integer constants.
s2u = {
'': NONE,
'%': PCT,
'px': PX,
'pt': PT,
'pc': PC,
'em': EM,
'ex': EX,
'cm': CM,
'mm': MM,
'in': IN,
}
# Unit to String. Basically, converts unit integer constants to their corresponding strings.
u2s = {
NONE: '',
PCT: '%',
PX: 'px',
PT: 'pt',
PC: 'pc',
EM: 'em',
EX: 'ex',
CM: 'cm',
MM: 'mm',
IN: 'in',
}
# @staticmethod
def get(unitstr):
if unitstr is None:
return Unit.NONE
try:
return Unit.s2u[unitstr]
except KeyError:
return Unit.INVALID
# @staticmethod
def str(unitint):
try:
return Unit.u2s[unitint]
except KeyError:
return 'INVALID'
get = staticmethod(get)
str = staticmethod(str)
class SVGLength(object):
def __init__(self, str):
try: # simple unitless and no scientific notation
self.value = float(str)
if int(self.value) == self.value:
self.value = int(self.value)
self.units = Unit.NONE
except ValueError:
# we know that the length string has an exponent, a unit, both or is invalid
# parse out number, exponent and unit
self.value = 0
unitBegin = 0
scinum = scinumber.match(str)
if scinum is not None:
# this will always match, no need to check it
numMatch = number.match(str)
expMatch = sciExponent.search(str, numMatch.start(0))
self.value = (float(numMatch.group(0)) *
10 ** float(expMatch.group(1)))
unitBegin = expMatch.end(1)
else:
# unit or invalid
numMatch = number.match(str)
if numMatch is not None:
self.value = float(numMatch.group(0))
unitBegin = numMatch.end(0)
if int(self.value) == self.value:
self.value = int(self.value)
if unitBegin != 0:
unitMatch = unit.search(str, unitBegin)
if unitMatch is not None:
self.units = Unit.get(unitMatch.group(0))
# invalid
else:
# TODO: this needs to set the default for the given attribute (how?)
self.value = 0
self.units = Unit.INVALID
def findElementsWithId(node, elems=None):
"""
Returns all elements with id attributes
"""
if elems is None:
elems = {}
id = node.getAttribute('id')
if id != '':
elems[id] = node
if node.hasChildNodes():
for child in node.childNodes:
# from http://www.w3.org/TR/DOM-Level-2-Core/idl-definitions.html
# we are only really interested in nodes of type Element (1)
if child.nodeType == 1:
findElementsWithId(child, elems)
return elems
referencingProps = ['fill', 'stroke', 'filter', 'clip-path', 'mask', 'marker-start', 'marker-end', 'marker-mid']
def findReferencedElements(node, ids=None):
"""
Returns the number of times an ID is referenced as well as all elements
that reference it. node is the node at which to start the search. The
return value is a map which has the id as key and each value is an array
where the first value is a count and the second value is a list of nodes
that referenced it.
Currently looks at fill, stroke, clip-path, mask, marker, and
xlink:href attributes.
"""
global referencingProps
if ids is None:
ids = {}
# TODO: input argument ids is clunky here (see below how it is called)
# GZ: alternative to passing dict, use **kwargs
# if this node is a style element, parse its text into CSS
if node.nodeName == 'style' and node.namespaceURI == NS['SVG']:
# one stretch of text, please! (we could use node.normalize(), but
# this actually modifies the node, and we don't want to keep
# whitespace around if there's any)
stylesheet = "".join([child.nodeValue for child in node.childNodes])
if stylesheet != '':
cssRules = parseCssString(stylesheet)
for rule in cssRules:
for propname in rule['properties']:
propval = rule['properties'][propname]
findReferencingProperty(node, propname, propval, ids)
return ids
# else if xlink:href is set, then grab the id
href = node.getAttributeNS(NS['XLINK'], 'href')
if href != '' and len(href) > 1 and href[0] == '#':
# we remove the hash mark from the beginning of the id
id = href[1:]
if id in ids:
ids[id][0] += 1
ids[id][1].append(node)
else:
ids[id] = [1, [node]]
# now get all style properties and the fill, stroke, filter attributes
styles = node.getAttribute('style').split(';')
for attr in referencingProps:
styles.append(':'.join([attr, node.getAttribute(attr)]))
for style in styles:
propval = style.split(':')
if len(propval) == 2:
prop = propval[0].strip()
val = propval[1].strip()
findReferencingProperty(node, prop, val, ids)
if node.hasChildNodes():
for child in node.childNodes:
if child.nodeType == 1:
findReferencedElements(child, ids)
return ids
def findReferencingProperty(node, prop, val, ids):
global referencingProps
if prop in referencingProps and val != '':
if len(val) >= 7 and val[0:5] == 'url(#':
id = val[5:val.find(')')]
if id in ids:
ids[id][0] += 1
ids[id][1].append(node)
else:
ids[id] = [1, [node]]
# if the url has a quote in it, we need to compensate
elif len(val) >= 8:
id = None
# double-quote
if val[0:6] == 'url("#':
id = val[6:val.find('")')]
# single-quote
elif val[0:6] == "url('#":
id = val[6:val.find("')")]
if id is not None:
if id in ids:
ids[id][0] += 1
ids[id][1].append(node)
else:
ids[id] = [1, [node]]
def removeUnusedDefs(doc, defElem, elemsToRemove=None):
if elemsToRemove is None:
elemsToRemove = []
referencedIDs = findReferencedElements(doc.documentElement)
keepTags = ['font', 'style', 'metadata', 'script', 'title', 'desc']
for elem in defElem.childNodes:
# only look at it if an element and not referenced anywhere else
if elem.nodeType == 1 and (elem.getAttribute('id') == '' or
elem.getAttribute('id') not in referencedIDs):
# we only inspect the children of a group in a defs if the group
# is not referenced anywhere else
if elem.nodeName == 'g' and elem.namespaceURI == NS['SVG']:
elemsToRemove = removeUnusedDefs(doc, elem, elemsToRemove)
# we only remove if it is not one of our tags we always keep (see above)
elif elem.nodeName not in keepTags:
elemsToRemove.append(elem)
return elemsToRemove
def removeUnreferencedElements(doc, keepDefs):
"""
Removes all unreferenced elements except for <svg>, <font>, <metadata>, <title>, and <desc>.
Also vacuums the defs of any non-referenced renderable elements.
Returns the number of unreferenced elements removed from the document.
"""
global _num_elements_removed
num = 0
# Remove certain unreferenced elements outside of defs
removeTags = ['linearGradient', 'radialGradient', 'pattern']
identifiedElements = findElementsWithId(doc.documentElement)
referencedIDs = findReferencedElements(doc.documentElement)
for id in identifiedElements:
if id not in referencedIDs:
goner = identifiedElements[id]
if (goner is not None and goner.nodeName in removeTags
and goner.parentNode is not None
and goner.parentNode.tagName != 'defs'):
goner.parentNode.removeChild(goner)
num += 1
_num_elements_removed += 1
if not keepDefs:
# Remove most unreferenced elements inside defs
defs = doc.documentElement.getElementsByTagName('defs')
for aDef in defs:
elemsToRemove = removeUnusedDefs(doc, aDef)
for elem in elemsToRemove:
elem.parentNode.removeChild(elem)
_num_elements_removed += 1
num += 1
return num
def shortenIDs(doc, prefix, unprotectedElements=None):
"""
Shortens ID names used in the document. ID names referenced the most often are assigned the
shortest ID names.
If the list unprotectedElements is provided, only IDs from this list will be shortened.
Returns the number of bytes saved by shortening ID names in the document.
"""
num = 0
identifiedElements = findElementsWithId(doc.documentElement)
if unprotectedElements is None:
unprotectedElements = identifiedElements
referencedIDs = findReferencedElements(doc.documentElement)
# Make idList (list of idnames) sorted by reference count
# descending, so the highest reference count is first.
# First check that there's actually a defining element for the current ID name.
# (Cyn: I've seen documents with #id references but no element with that ID!)
idList = [(referencedIDs[rid][0], rid) for rid in referencedIDs
if rid in unprotectedElements]
idList.sort(reverse=True)
idList = [rid for count, rid in idList]
# Add unreferenced IDs to end of idList in arbitrary order
idList.extend([rid for rid in unprotectedElements if rid not in idList])
curIdNum = 1
for rid in idList:
curId = intToID(curIdNum, prefix)
# First make sure that *this* element isn't already using
# the ID name we want to give it.
if curId != rid:
# Then, skip ahead if the new ID is already in identifiedElement.
while curId in identifiedElements:
curIdNum += 1
curId = intToID(curIdNum, prefix)
# Then go rename it.
num += renameID(doc, rid, curId, identifiedElements, referencedIDs)
curIdNum += 1
return num
def intToID(idnum, prefix):
"""
Returns the ID name for the given ID number, spreadsheet-style, i.e. from a to z,
then from aa to az, ba to bz, etc., until zz.
"""
rid = ''
while idnum > 0:
idnum -= 1
rid = chr((idnum % 26) + ord('a')) + rid
idnum = int(idnum / 26)
return prefix + rid
def renameID(doc, idFrom, idTo, identifiedElements, referencedIDs):
"""
Changes the ID name from idFrom to idTo, on the declaring element
as well as all references in the document doc.
Updates identifiedElements and referencedIDs.
Does not handle the case where idTo is already the ID name
of another element in doc.
Returns the number of bytes saved by this replacement.
"""
num = 0
definingNode = identifiedElements[idFrom]
definingNode.setAttribute("id", idTo)
del identifiedElements[idFrom]
identifiedElements[idTo] = definingNode
num += len(idFrom) - len(idTo)
# Update references to renamed node
referringNodes = referencedIDs.get(idFrom)
if referringNodes is not None:
# Look for the idFrom ID name in each of the referencing elements,
# exactly like findReferencedElements would.
# Cyn: Duplicated processing!
for node in referringNodes[1]:
# if this node is a style element, parse its text into CSS
if node.nodeName == 'style' and node.namespaceURI == NS['SVG']:
# node.firstChild will be either a CDATA or a Text node now
if node.firstChild is not None:
# concatenate the value of all children, in case
# there's a CDATASection node surrounded by whitespace
# nodes
# (node.normalize() will NOT work here, it only acts on Text nodes)
oldValue = "".join([child.nodeValue for child in node.childNodes])
# not going to reparse the whole thing
newValue = oldValue.replace('url(#' + idFrom + ')', 'url(#' + idTo + ')')
newValue = newValue.replace("url(#'" + idFrom + "')", 'url(#' + idTo + ')')
newValue = newValue.replace('url(#"' + idFrom + '")', 'url(#' + idTo + ')')
# and now replace all the children with this new stylesheet.
# again, this is in case the stylesheet was a CDATASection
node.childNodes[:] = [node.ownerDocument.createTextNode(newValue)]
num += len(oldValue) - len(newValue)
# if xlink:href is set to #idFrom, then change the id
href = node.getAttributeNS(NS['XLINK'], 'href')
if href == '#' + idFrom:
node.setAttributeNS(NS['XLINK'], 'href', '#' + idTo)
num += len(idFrom) - len(idTo)
# if the style has url(#idFrom), then change the id
styles = node.getAttribute('style')
if styles != '':
newValue = styles.replace('url(#' + idFrom + ')', 'url(#' + idTo + ')')
newValue = newValue.replace("url('#" + idFrom + "')", 'url(#' + idTo + ')')
newValue = newValue.replace('url("#' + idFrom + '")', 'url(#' + idTo + ')')
node.setAttribute('style', newValue)
num += len(styles) - len(newValue)
# now try the fill, stroke, filter attributes
for attr in referencingProps:
oldValue = node.getAttribute(attr)
if oldValue != '':
newValue = oldValue.replace('url(#' + idFrom + ')', 'url(#' + idTo + ')')
newValue = newValue.replace("url('#" + idFrom + "')", 'url(#' + idTo + ')')
newValue = newValue.replace('url("#' + idFrom + '")', 'url(#' + idTo + ')')
node.setAttribute(attr, newValue)
num += len(oldValue) - len(newValue)
del referencedIDs[idFrom]
referencedIDs[idTo] = referringNodes
return num
def unprotected_ids(doc, options):
u"""Returns a list of unprotected IDs within the document doc."""
identifiedElements = findElementsWithId(doc.documentElement)
if not (options.protect_ids_noninkscape or
options.protect_ids_list or
options.protect_ids_prefix):
return identifiedElements
if options.protect_ids_list:
protect_ids_list = options.protect_ids_list.split(",")
if options.protect_ids_prefix:
protect_ids_prefixes = options.protect_ids_prefix.split(",")
for id in list(identifiedElements.keys()):
protected = False
if options.protect_ids_noninkscape and not id[-1].isdigit():
protected = True
if options.protect_ids_list and id in protect_ids_list:
protected = True
if options.protect_ids_prefix:
for prefix in protect_ids_prefixes:
if id.startswith(prefix):
protected = True
if protected:
del identifiedElements[id]
return identifiedElements
def removeUnreferencedIDs(referencedIDs, identifiedElements):
"""
Removes the unreferenced ID attributes.
Returns the number of ID attributes removed
"""
global _num_ids_removed
keepTags = ['font']
num = 0
for id in list(identifiedElements.keys()):
node = identifiedElements[id]
if id not in referencedIDs and node.nodeName not in keepTags:
node.removeAttribute('id')
_num_ids_removed += 1
num += 1
return num
def removeNamespacedAttributes(node, namespaces):
global _num_attributes_removed
num = 0
if node.nodeType == 1:
# remove all namespace'd attributes from this element
attrList = node.attributes
attrsToRemove = []
for attrNum in range(attrList.length):
attr = attrList.item(attrNum)
if attr is not None and attr.namespaceURI in namespaces:
attrsToRemove.append(attr.nodeName)
for attrName in attrsToRemove:
num += 1
_num_attributes_removed += 1
node.removeAttribute(attrName)
# now recurse for children
for child in node.childNodes:
num += removeNamespacedAttributes(child, namespaces)
return num
def removeNamespacedElements(node, namespaces):
global _num_elements_removed
num = 0
if node.nodeType == 1:
# remove all namespace'd child nodes from this element
childList = node.childNodes
childrenToRemove = []
for child in childList:
if child is not None and child.namespaceURI in namespaces:
childrenToRemove.append(child)
for child in childrenToRemove:
num += 1
_num_elements_removed += 1
node.removeChild(child)
# now recurse for children
for child in node.childNodes:
num += removeNamespacedElements(child, namespaces)
return num
def removeDescriptiveElements(doc, options):
elementTypes = []
if options.remove_descriptive_elements:
elementTypes.extend(("title", "desc", "metadata"))
else:
if options.remove_titles:
elementTypes.append("title")
if options.remove_descriptions:
elementTypes.append("desc")
if options.remove_metadata:
elementTypes.append("metadata")
if not elementTypes:
return
global _num_elements_removed
num = 0
elementsToRemove = []
for elementType in elementTypes:
elementsToRemove.extend(doc.documentElement.getElementsByTagName(elementType))
for element in elementsToRemove:
element.parentNode.removeChild(element)
num += 1
_num_elements_removed += 1
return num
def removeNestedGroups(node):
"""
This walks further and further down the tree, removing groups
which do not have any attributes or a title/desc child and
promoting their children up one level
"""
global _num_elements_removed
num = 0
groupsToRemove = []
# Only consider <g> elements for promotion if this element isn't a <switch>.
# (partial fix for bug 594930, required by the SVG spec however)
if not (node.nodeType == 1 and node.nodeName == 'switch'):
for child in node.childNodes:
if child.nodeName == 'g' and child.namespaceURI == NS['SVG'] and len(child.attributes) == 0:
# only collapse group if it does not have a title or desc as a direct descendant,
for grandchild in child.childNodes:
if grandchild.nodeType == 1 and grandchild.namespaceURI == NS['SVG'] and \
grandchild.nodeName in ['title', 'desc']:
break
else:
groupsToRemove.append(child)
for g in groupsToRemove:
while g.childNodes.length > 0:
g.parentNode.insertBefore(g.firstChild, g)
g.parentNode.removeChild(g)
_num_elements_removed += 1
num += 1
# now recurse for children
for child in node.childNodes:
if child.nodeType == 1:
num += removeNestedGroups(child)
return num
def moveCommonAttributesToParentGroup(elem, referencedElements):
"""
This recursively calls this function on all children of the passed in element
and then iterates over all child elements and removes common inheritable attributes
from the children and places them in the parent group. But only if the parent contains
nothing but element children and whitespace. The attributes are only removed from the
children if the children are not referenced by other elements in the document.
"""
num = 0
childElements = []
# recurse first into the children (depth-first)
for child in elem.childNodes:
if child.nodeType == 1:
# only add and recurse if the child is not referenced elsewhere
if not child.getAttribute('id') in referencedElements:
childElements.append(child)
num += moveCommonAttributesToParentGroup(child, referencedElements)
# else if the parent has non-whitespace text children, do not
# try to move common attributes
elif child.nodeType == 3 and child.nodeValue.strip():
return num