inkex.py revision 435aab18e26f3b3388d4d69f8eab7bd85aae5c80
#!/usr/bin/env python
"""
inkex.py
A helper module for creating Inkscape extensions
Copyright (C) 2005,2007 Aaron Spike, aaron@ekips.org
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
import sys, copy, optparse, random, re
#a dictionary of all of the xmlns prefixes in a standard inkscape doc
NSS = {
u'sodipodi' :u'http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd',
u'cc' :u'http://web.resource.org/cc/',
u'svg' :u'http://www.w3.org/2000/svg',
u'dc' :u'http://purl.org/dc/elements/1.1/',
u'rdf' :u'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
u'inkscape' :u'http://www.inkscape.org/namespaces/inkscape',
u'xlink' :u'http://www.w3.org/1999/xlink',
u'xml' :u'http://www.w3.org/XML/1998/namespace'
}
#a dictionary of unit to user unit conversion factors
uuconv = {'in':90.0, 'pt':1.25, 'px':1, 'mm':3.5433070866, 'cm':35.433070866, 'pc':15.0}
def unittouu(string):
'''Returns userunits given a string representation of units in another system'''
unit = re.compile('(%s)$' % '|'.join(uuconv.keys()))
param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
p = param.match(string)
u = unit.search(string)
if p:
retval = float(p.string[p.start():p.end()])
else:
retval = 0.0
if u:
try:
return retval * uuconv[u.string[u.start():u.end()]]
except KeyError:
pass
return retval
try:
from lxml import etree
except:
sys.exit('The fantastic lxml wrapper for libxml2 is required by inkex.py and therefore this extension. Please download and install the latest version from <http://cheeseshop.python.org/pypi/lxml/>.')
def debug(what):
sys.stderr.write(str(what) + "\n")
return what
def check_inkbool(option, opt, value):
if str(value).capitalize() == 'True':
return True
elif str(value).capitalize() == 'False':
return False
else:
raise OptionValueError("option %s: invalid inkbool value: %s" % (opt, value))
def addNS(tag, ns=None):
val = tag
if ns!=None and len(ns)>0 and NSS.has_key(ns):
val = "{%s}%s" % (NSS[ns], tag)
return val
class InkOption(optparse.Option):
TYPES = optparse.Option.TYPES + ("inkbool",)
TYPE_CHECKER = copy.copy(optparse.Option.TYPE_CHECKER)
TYPE_CHECKER["inkbool"] = check_inkbool
class Effect:
"""A class for creating Inkscape SVG Effects"""
def __init__(self, *args, **kwargs):
self.id_characters = '0123456789abcdefghijklmnopqrstuvwkyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
self.document=None
self.ctx=None
self.selected={}
self.doc_ids={}
self.options=None
self.args=None
self.OptionParser = optparse.OptionParser(usage="usage: %prog [options] SVGfile",option_class=InkOption)
self.OptionParser.add_option("--id",
action="append", type="string", dest="ids", default=[],
help="id attribute of object to manipulate")
def effect(self):
pass
def getoptions(self,args=sys.argv[1:]):
"""Collect command line arguments"""
self.options, self.args = self.OptionParser.parse_args(args)
def parse(self,file=None):
"""Parse document in specified file or on stdin"""
try:
try:
stream = open(file,'r')
except:
stream = open(self.args[-1],'r')
except:
stream = sys.stdin
self.document = etree.parse(stream)
stream.close()
def getposinlayer(self):
#defaults
self.current_layer = self.document.getroot()
self.view_center = (0.0,0.0)
layerattr = self.document.xpath('//sodipodi:namedview/@inkscape:current-layer', NSS)
if layerattr:
layername = layerattr[0]
layer = self.document.xpath('//g[@id="%s"]' % layername, NSS)
if layer:
self.current_layer = layer[0]
xattr = self.document.xpath('//sodipodi:namedview/@inkscape:cx', NSS)
yattr = self.document.xpath('//sodipodi:namedview/@inkscape:cy', NSS)
doc_height = unittouu(self.document.getroot().get('height'))
if xattr and yattr:
x = xattr[0]
y = yattr[0]
if x and y:
self.view_center = (float(x), doc_height - float(y)) # FIXME: y-coordinate flip, eliminate it when it's gone in Inkscape
def getselected(self):
"""Collect selected nodes"""
for id in self.options.ids:
path = '//*[@id="%s"]' % id
for node in self.document.xpath(path, NSS):
self.selected[id] = node
def getdocids(self):
docIdNodes = self.document.xpath('//@id', NSS)
for m in docIdNodes:
self.doc_ids[m] = 1
def output(self):
"""Serialize document into XML on stdout"""
self.document.write(sys.stdout)
def affect(self):
"""Affect an SVG document with a callback effect"""
self.getoptions()
self.parse()
self.getposinlayer()
self.getselected()
self.getdocids()
self.effect()
self.output()
def uniqueId(self, old_id, make_new_id = True):
new_id = old_id
if make_new_id:
while new_id in self.doc_ids:
new_id = "%s%s" % (new_id,random.choice(self.id_characters))
self.doc_ids[new_id] = 1
return new_id
def xpathSingle(self, path):
try:
retval = self.document.xpath(path, NSS)[0]
except:
debug("No matching node for expression: %s" % path)
retval = None
return retval