"""Demonstrates the Transformer object.
"""

import Pyana
import sys
import time

xsl = r'''
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output method="text"/>
    <xsl:param name="excitement"/>
    <xsl:template match="message"><xsl:value-of
                  select="concat(child::text(), $excitement)"/></xsl:template>
</xsl:stylesheet>
'''

xml = '<message>Hello World</message>'

t = Pyana.Transformer()

# Python XPath extensions can be installed on a per-transformation object
# basis using:
# t.installExtension()
# t.installExtensionWithContext()
# t.removeExtension

t.setStylesheetParams({'excitement' : "'!'"})

# Disable validation for source documents (disabled is the default) 
t.useValidation = 0

startTime = time.clock()
for i in range(100):
    t.transform2String(xml, xsl)
print 'Time to transform (x100) without compilation: %.4fs' % (time.clock() - startTime)


compiled = t.compileStylesheet(xsl)
parsed = t.parseSource(xml)

startTime = time.clock()
for i in range(100):
    t.transform2String(parsed, compiled)
print 'Time to transform (x100) with compilation:    %.4fs' % (time.clock() - startTime)