import copy

import gettext

import optparse

import os

import random

import re

import sys

from math import *

NSS = {

u'sodipodi' :u'http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd',

u'cc' :u'http://creativecommons.org/ns#',

u'ccOLD' :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'

}

def localize():

domain = 'inkscape'

if sys.platform.startswith('win'):

import locale

current_locale, encoding = locale.getdefaultlocale()

os.environ['LANG'] = current_locale

try:

localdir = os.environ['INKSCAPE_LOCALEDIR'];

trans = gettext.translation(domain, localdir, [current_locale], fallback=True)

except KeyError:

trans = gettext.translation(domain, fallback=True)

elif sys.platform.startswith('darwin'):

try:

localdir = os.environ['INKSCAPE_LOCALEDIR'];

trans = gettext.translation(domain, localdir, fallback=True)

except KeyError:

try:

localdir = os.environ['PACKAGE_LOCALE_DIR'];

trans = gettext.translation(domain, localdir, fallback=True)

except KeyError:

trans = gettext.translation(domain, fallback=True)

else:

try:

localdir = os.environ['PACKAGE_LOCALE_DIR'];

trans = gettext.translation(domain, localdir, fallback=True)

except KeyError:

trans = gettext.translation(domain, fallback=True)

#sys.stderr.write(str(localdir) + "\n")

trans.install()

def debug(what):

sys.stderr.write(str(what) + "\n")

return what

def errormsg(msg):

"""Intended for end-user-visible error messages.

if isinstance(msg, unicode):

sys.stderr.write(msg.encode("UTF-8") + "\n")

else:

sys.stderr.write((unicode(msg, "utf-8", errors='replace') + "\n").encode("UTF-8"))

def are_near_relative(a, b, eps):

if (a-b <= a*eps) and (a-b >= -a*eps):

return True

else:

return False

try:

from lxml import etree

except Exception, e:

localize()

errormsg(_("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/, or install it through your package manager by a command like: sudo apt-get install python-lxml\n\nTechnical details:\n%s" % (e,)))

sys.exit()

def check_inkbool(option, opt, value):

if str(value).capitalize() == 'True':

return True

elif str(value).capitalize() == 'False':

return False

else:

raise optparse.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) and len(tag)>0 and tag[0]!='{':

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.document=None

self.original_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, filename=None):

"""Parse document in specified file or on stdin"""

# First try to open the file from the function argument

if filename != None:

try:

stream = open(filename, 'r')

except Exception:

errormsg(_("Unable to open specified file: %s") % filename)

sys.exit()

# If it wasn't specified, try to open the file specified as

# an object member

elif self.svg_file != None:

try:

stream = open(self.svg_file, 'r')

except Exception:

errormsg(_("Unable to open object member file: %s") % self.svg_file)

sys.exit()

# Finally, if the filename was not specified anywhere, use

# standard input stream

else:

stream = sys.stdin

p = etree.XMLParser(huge_tree=True)

self.document = etree.parse(stream, parser=p)

self.original_document = copy.deepcopy(self.document)

stream.close()

# defines view_center in terms of document units

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', namespaces=NSS)

if layerattr:

layername = layerattr[0]

layer = self.document.xpath('//svg:g[@id="%s"]' % layername, namespaces=NSS)

if layer:

self.current_layer = layer[0]

xattr = self.document.xpath('//sodipodi:namedview/@inkscape:cx', namespaces=NSS)

yattr = self.document.xpath('//sodipodi:namedview/@inkscape:cy', namespaces=NSS)

if xattr and yattr:

x = self.unittouu( xattr[0] + 'px' )

y = self.unittouu( yattr[0] + 'px')

doc_height = self.unittouu(self.document.getroot().get('height'))

if x and y and doc_height is not None:

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 i in self.options.ids:

path = '//*[@id="%s"]' % i

for node in self.document.xpath(path, namespaces=NSS):

self.selected[i] = node

def getElementById(self, id):

path = '//*[@id="%s"]' % id

el_list = self.document.xpath(path, namespaces=NSS)

if el_list:

return el_list[0]

else:

return None

def getParentNode(self, node):

for parent in self.document.getiterator():

if node in parent.getchildren():

return parent

break

def getdocids(self):

docIdNodes = self.document.xpath('//@id', namespaces=NSS)

for m in docIdNodes:

self.doc_ids[m] = 1

def getNamedView(self):

return self.document.xpath('//sodipodi:namedview', namespaces=NSS)[0]

def createGuide(self, posX, posY, angle):

atts = {

'position': str(posX)+','+str(posY),

'orientation': str(sin(radians(angle)))+','+str(-cos(radians(angle)))

}

guide = etree.SubElement(

self.getNamedView(),

addNS('guide','sodipodi'), atts )

return guide

def output(self):

"""Serialize document into XML on stdout"""

original = etree.tostring(self.original_document)

result = etree.tostring(self.document)

if original != result:

self.document.write(sys.stdout)

def affect(self, args=sys.argv[1:], output=True):

"""Affect an SVG document with a callback effect"""

self.svg_file = args[-1]

self.getoptions(args)

self.parse()

self.getposinlayer()

self.getselected()

self.getdocids()

self.effect()

if output: 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 += random.choice('0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')

self.doc_ids[new_id] = 1

return new_id

def xpathSingle(self, path):

try:

retval = self.document.xpath(path, namespaces=NSS)[0]

except:

errormsg(_("No matching node for expression: %s") % path)

retval = None

return retval

#a dictionary of unit to user unit conversion factors

__uuconv = {'in':96.0, 'pt':1.33333333333, 'px':1.0, 'mm':3.77952755913, 'cm':37.7952755913,

'm':3779.52755913, 'km':3779527.55913, 'pc':16.0, 'yd':3456.0 , 'ft':1152.0}

# Function returns the unit used for the values in SVG.

# For lack of an attribute in SVG that explicitly defines what units are used for SVG coordinates,

# try to calculate the unit from the SVG width and SVG viewbox.

# Defaults to 'px' units.

def getDocumentUnit(self):

svgunit = 'px' #default to pixels

svgwidth = self.document.getroot().get('width')

viewboxstr = self.document.getroot().get('viewBox')

if viewboxstr and svgwidth is not None:

unitmatch = re.compile('(%s)$' % '|'.join(self.__uuconv.keys()))

param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')

p = param.match(svgwidth)

u = unitmatch.search(svgwidth)

width = 100 #default

viewboxwidth = 100 #default

svgwidthunit = 'px' #default assume 'px' unit

if p:

width = float(p.string[p.start():p.end()])

else:

errormsg(_("SVG Width not set correctly! Assuming width = 100"))

if u:

svgwidthunit = u.string[u.start():u.end()]

viewboxnumbers = []

for t in viewboxstr.split():

try:

viewboxnumbers.append(float(t))

except ValueError:

pass

if len(viewboxnumbers) == 4: #check for correct number of numbers

viewboxwidth = viewboxnumbers[2]

svgunitfactor = self.__uuconv[svgwidthunit] * width / viewboxwidth

# try to find the svgunitfactor in the list of units known. If we don't find something, ...

eps = 0.01 #allow 1% error in factor

for key in self.__uuconv:

if are_near_relative(self.__uuconv[key], svgunitfactor, eps):

#found match!

svgunit = key;

return svgunit

def unittouu(self, string):

'''Returns userunits given a string representation of units in another system'''

unit = re.compile('(%s)$' % '|'.join(self.__uuconv.keys()))

param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')

if string is not None:

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 * (self.__uuconv[u.string[u.start():u.end()]] / self.__uuconv[self.getDocumentUnit()])

except KeyError:

pass

else: # default assume 'px' unit

return retval / self.__uuconv[self.getDocumentUnit()]

else:

retval = None

return retval

def uutounit(self, val, unit):

return val / (self.__uuconv[unit] / self.__uuconv[self.getDocumentUnit()])

def addDocumentUnit(self, value):

''' Add document unit when no unit is specified in the string '''

try:

float(value)

return value + self.getDocumentUnit()

except ValueError:

return value