New subject: [lxml-dev] document('') and custom resolver not working again/still

Jan. 27, 2008

      I am stumped. Probably doing something stupid but I just cannot get 
document('') to work with lxml, but it does work when the .xsl is sent 
to the browser (ff) and it does work with xsltproc

I think there's been a change in libxslt at some point, but I don't know 
exactly what changed.

This deployment works:

RHEL4 linux with libxml2 2.6.27 and libxslt 1.1.18, with lxml 2 alpha4

this deployment does not work:

Centos 4 with libxml2 2.6.28 and libxslt 1.1.19 with lxml 2 alpha 3

So I upgraded to libxml2 2.6.30, libxslt 1.1.22 and lxml 2 beta 2
But it still doesn't work correctly.

I am passing a base_url when creating documents using etree.fromstring

I've traced the execution of document('') via gdb, both in 
libxslt/functions.c and libxslt/documents.c

For example, in libxslt/functions.c

        142             idoc = xsltLoadDocument(tctxt, URI);
        (gdb) print URI
        $7 = (xmlChar *) 0x90e7c00 "/carrier_payables/view.htm"

the correct uri (what I passed for base_url) is shown

and

    Now in documents.c line 315::

        317             if ((ret->doc != NULL) && (ret->doc->URL != NULL) &&
        (gdb) print ret->doc
        $11 = 0x90d6ef8
        (gdb) print ret->doc->URL
        $12 = (const xmlChar *) 0x90dca08 "/carrier_payables/view.htm"
        (gdb) print URI
        $13 = (const xmlChar *) 0x90e7c00 "/carrier_payables/view.htm"

so all seems to be correct, it is returning the expected document back 
to the xpath evaluator.

I'm stumped  that it works with older versions of libxslt, works with 
client-side transform, and works with xsltproc, but not through lxml 
with "newer libxslt"

Can anyone suggest some other steps I can use to diagnose this problem?  
I'm sure I've done something wrong with how I am using
lxml, but I can't figure it out.

My .xsl looks (in part) like this. Its loaded using etree.fromstring 
with a base_url:

<?xml version="1.0"?>
<xsl_:stylesheet xmlns:xsl_="http://www.w3.org/1999/XSL/Transform" 
xmlns:metal="http://xml.zope.org/namespaces/metal"
xmlns:tal="http://xml.zope.org/namespaces/tal" xmlns:const="const.uri" 
version="1.0" exclude-result-prefixes="tal metal const">
  <xsl_:output encoding="utf-8" method="xml" omit-xml-declaration="no" 
cdata-section-elements="" doctype-public="-//W3C//DTD XHTML 1.0 
Transitional//EN"
doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"/>
  <const:javascript id="number_pad_javascript">
    <const:file>MochiKit/MochiKit.js</const:file>
    <const:file>jstal/jstal.js</const:file>
    <const:file>global.js</const:file>
    <const:file>view.js</const:file>
  </const:javascript>
  <xsl_:template match="/">
    <html xmlns="http://www.w3.org/1999/xhtml">
      <head>
        <title>
                        View Carrier Payables
                </title>
        <link rel="stylesheet" type="text/css" href="/css/default.css"/>
        <link rel="stylesheet" media="print" type="text/css" 
href="/css/print.css"/>
      </head>
      <body>
        <div id="ajax-indicator" style="display:none" class="no-print">
          <img title="some title" width="24" height="24" 
src="/images/ajax_indicator.gif"/>
        </div>
        <xsl_:for-each select="document('')//const:javascript/const:file">
          <xsl_:variable name="file" select="."/>
          <script type="text/javascript">
            <xsl_:attribute name="src">
              <xsl_:value-of select="concat('/scripts/', $file)"/>
            </xsl_:attribute>
          </script>
        </xsl_:for-each>
       <div>more stuff</div>
     </body>
  </html>
</xsl_:template>
</xsl_:stylesheet>

using xsltproc against a source xml file:

<root />

produces this output

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>
                        View Carrier Payables
                </title>
    <link rel="stylesheet" type="text/css" href="/css/default.css" />
    <link rel="stylesheet" media="print" type="text/css" 
href="/css/print.css" />
  </head>
  <body>
    <div id="ajax-indicator" style="display:none" class="no-print">
      <img title="some title" width="24" height="24" 
src="/images/ajax_indicator.gif" />
    </div>
    <script type="text/javascript" 
src="/scripts/MochiKit/MochiKit.js"></script>
    <script type="text/javascript" src="/scripts/jstal/jstal.js"></script>
    <script type="text/javascript" src="/scripts/global.js"></script>
    <script type="text/javascript" src="/scripts/view.js"></script>
    <div>more stuff</div>

But with lxml, I get:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>
                        View Carrier Payables
                </title>
    <link rel="stylesheet" type="text/css" href="/css/default.css" />
    <link rel="stylesheet" media="print" type="text/css" 
href="/css/print.css" />
  </head>
  <body>
    <div id="ajax-indicator" style="display:none" class="no-print">
      <img title="some title" width="24" height="24" 
src="/images/ajax_indicator.gif" />
    </div>
    <div>more stuff</div>

I am using a custom resolver. The resolver is not asked to resolve the 
.xsl stylesheet, nor is it asked to resolve ''

p-code is like this:

            parser = etree.XMLParser(load_dtd=True)
            parser.resolvers.add(Resolver(resolver=my_resolver))
            stylesheet_doc = etree.fromstring(xslt_src, parser, 
base_url=xsl_uri)
            stylesheet = etree.XSLT(stylesheet_doc)

likewise the source xml is loaded in the same way

            parser = etree.XMLParser(load_dtd=True)

parser.resolvers.add(Resolver(resolver=my_resolver))                                      

            xml_doc = etree.fromstring(xml_src, parser, base_url=xml_uri)

finally

return stylesheet(xml_doc, **params)

-- 
Brad Clements, bkc@murkworks.com (315)268-1000
http://www.murkworks.com
AOL-IM: BKClements

[lxml-dev] document('') and custom resolver not working again/still

Brad Clements

Stefan Behnel

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