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#
#
# $Id: saxhack.py,v 1.5 2001/12/30 12:17:32 loewis Exp $
#
# illustrate how a saxlib parser can interface directly to sgmlop
#
# history:
# 98-05-23 fl created (derived from the coreXML parser)
#
# Copyright (c) 1998 by Secret Labs AB
#
# info@pythonware.com
# http://www.pythonware.com
#
from xml.sax.saxlib import HandlerBase
class DocumentHandler:#(HandlerBase):
# SAX interface
def startElement(self, tag, attrs):
pass # print "start", tag
def endElement(self, tag):
pass # print "end", tag
def characters(self, text, start, len):
pass # print "data", text[start:start+len]
# --------------------------------------------------------------------
# sgmlop-based parser
from xml.parsers import sgmlop
class Parser:
def setDocumentHandler(self, dh):
self.parser = sgmlop.XMLParser()
self.parser.register(dh, 1)
def parseFile(self, file):
parser = self.parser
while 1:
data = file.read(16384)
if not data:
break
parser.feed(data)
parser.close()
# --------------------------------------------------------------------
# xmllib-based parser
from xml.parsers import xmllib
class xmllibParser(xmllib.XMLParser):
def setDocumentHandler(self, dh):
self.characters = dh.characters
self.unknown_starttag = dh.startElement
self.unknown_endtag = dh.endElement
def handle_data(self, data):
self.characters(data, 0, len(data))
def parseFile(self, file):
while 1:
data = file.read(16384)
if not data:
break
self.feed(data)
self.close()
# --------------------------------------------------------------------
# original xmllib-based parser
class slowParser(xmllib.SlowXMLParser):
def setDocumentHandler(self, dh):
self.characters = dh.characters
self.unknown_starttag = dh.startElement
self.unknown_endtag = dh.endElement
def handle_data(self, data):
self.characters(data, 0, len(data))
def parseFile(self, file):
while 1:
data = file.read(16384)
if not data:
break
self.feed(data)
file.close()
# ====================================================================
# test stuff
import time, os, sys
if len(sys.argv) == 1:
print 'Usage: saxhack.py <xml filename>'
sys.exit(1)
FILE = sys.argv[1]
size = os.stat(FILE)[6]
p = Parser()
dh = DocumentHandler()
p.setDocumentHandler(dh)
f = open(FILE)
t = time.clock()
p.parseFile(f) # dry run
t_direct = time.clock() - t
f.close()
#import sys ; sys.exit(0)
print t_direct
if t_direct == 0:
print 'Measured time was too small; use a larger XML file'
sys.exit(1)
print "sgmlop:", int(size / t_direct), "bytes per second"
p = xmllibParser()
#p=slowParser()
dh = DocumentHandler()
p.setDocumentHandler(dh)
f = open(FILE)
t = time.clock()
p.parseFile(f) # dry run
t_fast = time.clock() - t
f.close()
print "xmllib:", int(size / t_fast), "bytes per second"
p = slowParser()
dh = DocumentHandler()
p.setDocumentHandler(dh)
f = open(FILE)
t = time.clock()
p.parseFile(f) # dry run
t_slow = time.clock() - t
f.close()
print "slow xmllib:", int(size / t_slow), "bytes per second"
print
print "normalized timings:"
print "slow xmllib", 1.0
print "fast xmllib", round(t_fast / t_slow, 2), "(%sx)" % round(t_slow / t_fast, 1)
print "sgmlop ", round(t_direct / t_slow, 2), "(%sx)" % round(t_slow / t_direct, 1)
print
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