setDocumentLocator in validating parser (xmlproc)

[Cees Wesseling]

Hi,

it seems that xmlproc, the default Validating parser, in my setup does
not call back to setDocumentLoca tor. Is there anyway to get a locator
in my handler?
Below you find an example and its output.

Regards, Cees

# base imports
from xml.sax.handler import ContentHandler
from xml.sax.handler import EntityResolver
import xml.sax
import xml.sax.sax2ext s

class BaseHandler(Con tentHandler):
def setDocumentLoca tor(self,locato r):
print "setDocumentLoc ator called"
self.d_locator= locator

def startElement(se lf, name, attr):
print "startEleme nt", name


open('e.dtd','w ').write('<!ELE MENT E EMPTY>')
open('e.xml','w ').write(
"""<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE E SYSTEM "e.dtd"><E/>""")

vp = xml.sax.sax2ext s.XMLValParserF actory.make_par ser()
print "vp type", vp.__class__
vph = BaseHandler()
vp.setContentHa ndler(vph)
vp.parse("e.xml ")

np = xml.sax.make_pa rser()
print "np type", np.__class__
nph = BaseHandler()
np.setContentHa ndler(nph)
np.parse("e.xml ")

OUTPUT:
vp type xml.sax.drivers 2.drv_xmlproc.X mlprocDriver
startElement E
np type xml.sax.expatre ader.ExpatParse r
setDocumentLoca tor called
startElement E

[James Kew]

Re: setDocumentLoca tor in validating parser (xmlproc)

"Cees Wesseling" <cees@pcraster. nl> wrote in message
news:6b22838c.0 503181241.705ee 9e2@posting.goo gle.com...[color=blue]
> it seems that xmlproc, the default Validating parser, in my setup does
> not call back to setDocumentLoca tor. Is there anyway to get a locator
> in my handler?[/color]

It's a known bug with a simple patch -- I don't know why it wasn't fixed in
PyXML 0.8.4.
http://sourceforge.net/tracker/?func...73&atid=106473

I had the same problem a while ago; I ended up doing a monkeypatch to
xml.sax.drivers 2.drv_xmlproc to add the missing call:

import xml.sax.drivers 2.drv_xmlproc

# Override the set_locator method.
def set_locator(sel f, locator):
# Existing code.
self._locator = locator
# ...but also call the ContentHandler.
# drv_xmlproc already implements the Locator interface.
self._cont_hand ler.setDocument Locator(self)

setattr(xml.sax .drivers2.drv_x mlproc.XmlprocD river, "set_locato r",
set_locator)

HTH,

James Kew

http://jameskew.blogspot.com

[Cees Wesseling]

Re: setDocumentLoca tor in validating parser (xmlproc)

"James Kew" <james.kew@gmai l.com> wrote in message news:<d1fml1$fn 6$1@news.astoun d.net>...

Thanks James, a perfect patch that works perfect for me.

On a side note, it seems the locator is not standarized. expat gives
positions at the "<"-char of startElement while xmlproc (PyXml) gives
it the ">"-char of startElement.An d both one columnNumber off. A bit
annoying when swapping parsers.

Cees