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inkex.py

#!/usr/bin/env python
"""
inkex.py
A helper module for creating Inkscape extensions

Copyright (C) 2005 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
try:
      import xml.dom.ext
      import xml.dom.ext.reader.Sax2
      import xml.xpath
except:
      sys.exit('The inkex.py module requires PyXML. Please download the latest version from <http://pyxml.sourceforge.net/>.')

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))

class InkOption(optparse.Option):
    TYPES = optparse.Option.TYPES + ("inkbool",)
    TYPE_CHECKER = copy.copy(optparse.Option.TYPE_CHECKER)
    TYPE_CHECKER["inkbool"] = check_inkbool


00048 class Effect:
      """A class for creating Inkscape SVG Effects"""
      def __init__(self):
            self.document=None
            self.selected={}
            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
00061       def getoptions(self,args=sys.argv[1:]):
            """Collect command line arguments"""
            self.options, self.args = self.OptionParser.parse_args(args)
00064       def parse(self,file=None):
            """Parse document in specified file or on stdin"""
            reader = xml.dom.ext.reader.Sax2.Reader()
            try:
                  try:
                        stream = open(file,'r')
                  except:
                        stream = open(self.args[-1],'r')
            except:
                  stream = sys.stdin
            self.document = reader.fromStream(stream)
            stream.close()
00076       def getselected(self):
            """Collect selected nodes"""
            for id in self.options.ids:
                  path = '//*[@id="%s"]' % id
                  for node in xml.xpath.Evaluate(path,self.document):
                        self.selected[id] = node
00082       def output(self):
            """Serialize document into XML on stdout"""
            xml.dom.ext.Print(self.document)
00085       def affect(self):
            """Affect an SVG document with a callback effect"""
            self.getoptions()
            self.parse()
            self.getselected()
            self.effect()
            self.output()

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