[XML-SIG] location handling in pyexpat

[Speedy]

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Hi.

I use pyexpat to parse xml stuff and I needed location, even in well
formed documents. I've made a few changes in pyexpat to make it work,
but I'm not sure it's the "right" way to do it.

I just added a few lines in the file drv_pyexpat.py.

I join to this e-mail
- a patch for drv_pyexpat.py (drv_pyexpat.py.patch).
- an example of code with location handling (Example.py).

This example is a (useless) python script. 

$ Example.py Element_Name XML_File

It uses pyexpat to scan the file XML_File and display the position
of the elements named Element_Name.

Do you think these changes can become part of the next version of 
pyxml, or do I need to rethink about it ?

Jerome Chantelauze
jerome@free-system.com

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Content-Disposition: attachment; filename="drv_pyexpat.py.patch"

*** drv_pyexpat.py.orig	Fri Nov  3 16:20:52 2000
--- drv_pyexpat.py	Fri Nov  3 16:34:39 2000
***************
*** 41,53 ****
--- 41,61 ----
              at[attrs[i]] = attrs[i+1]
              
+         # Line added for location handling
+         self.doc_handler.setDocumentLocator(self)
          self.doc_handler.startElement(name,saxutils.AttributeMap(at))
  
      def endElement(self,name):
+         # Line added for location handling
+         self.doc_handler.setDocumentLocator(self)
          self.doc_handler.endElement(name)
  
      def characters(self,data):
+         # Line added for location handling
+         self.doc_handler.setDocumentLocator(self)
          self.doc_handler.characters(data,0,len(data))
  
      def processingInstruction(self,target,data):
+         # Line added for location handling
+         self.doc_handler.setDocumentLocator(self)
          self.doc_handler.processingInstruction(target,data)
  

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#!/usr/bin/python

from xml.sax import saxlib, saxexts
import sys

class my_document_handler(saxlib.DocumentHandler):

	def __init__(self, Target):
		self.Target=Target
		self.Found=0

	# Called by drv_pyexpat with a locator.
	def setDocumentLocator(self, Locator):
		self.Locator=Locator

	def endDocument(self):
		if not self.Found:
			print "Element %s not found." % (self.Target,)

	def startElement(self, name, attrs):
		if name==self.Target:
			self.Found=self.Found+1
			print "Found %s element at (%s,%s)" % \
                (self.Target, self.Locator.getColumnNumber(),
                 self.Locator.getLineNumber())


File=None
if len(sys.argv)!=3:
	print "Usage: Example.py Target File"
else:
	File=open(sys.argv[2], "r")

	my_parser=saxexts.make_parser()
	my_handler=my_document_handler(sys.argv[1])
	my_parser.setDocumentHandler(my_handler)

	my_parser.parseFile(File)

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