liblouisxslt.py
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#! /usr/bin/python -u
#
# liblouis Braille Translation and Back-Translation Library
# Copyright (C) 2010 Swiss Library for the Blind, Visually Impaired and Print Disabled
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved. This file is offered as-is,
# without any warranty.
# This is a very simple example on how to extend libxslt to be able to
# invoke liblouis from xslt. See also the accompanying
# dtbook2brldtbook.xsl in the same directory which simpy copies a dtbook
# xml and translates all the text node into Braille.
import louis
import libxml2
import libxslt
import sys
import getopt
from optparse import OptionParser
nodeName = None
emphasisMap = {
'plain_text' : louis.plain_text,
'italic' : louis.italic,
'underline' : louis.underline,
'bold' : louis.bold,
'computer_braille' : louis.computer_braille}
def translate(ctx, str, translation_table, emphasis=None):
global nodeName
try:
pctxt = libxslt.xpathParserContext(_obj=ctx)
ctxt = pctxt.context()
tctxt = ctxt.transformContext()
nodeName = tctxt.insertNode().name
except:
pass
typeform = len(str)*[emphasisMap[emphasis]] if emphasis else None
braille = louis.translate([translation_table], str.decode('utf-8'), typeform=typeform)[0]
return braille.encode('utf-8')
def xsltProcess(styleFile, inputFile, outputFile):
"""Transform an xml inputFile to an outputFile using the given styleFile"""
styledoc = libxml2.parseFile(styleFile)
style = libxslt.parseStylesheetDoc(styledoc)
doc = libxml2.parseFile(inputFile)
result = style.applyStylesheet(doc, None)
style.saveResultToFilename(outputFile, result, 0)
style.freeStylesheet()
doc.freeDoc()
result.freeDoc()
libxslt.registerExtModuleFunction("translate", "http://liblouis.org/liblouis", translate)
def main():
usage = "Usage: %prog [options] styleFile inputFile outputFile"
parser = OptionParser(usage)
(options, args) = parser.parse_args()
if len(args) != 3:
parser.error("incorrect number of arguments")
xsltProcess(args[0], args[1], args[2])
if __name__ == "__main__":
main()