Error in XSL filter: "xsltParseStylesheetProcess : document is not a stylesheet"

[Dan Brendstrup]

I'm trying to use the XSL filter that was added in Nanoc 3.3, but I keep running into this error:

    RuntimeError: compilation error: element site

    xsltParseStylesheetProcess : document is not a stylesheet

I can force the same error if I run xsltproc on the commandline with the arguments reversed (i.e. "xsltproc content/content.xml layouts/master.xsl" rather than the correct "xsltproc layouts/master.xsl content/content.xml"), so it feels like something in the Nokogiri integration is wrong, but I can't quite pinpoint it. Has anyone else experienced this error? Or has anyone successfully used the XSL filter?

This is what I've pared my setup down to:

content/content.xml:

    <?xml version="1.0" encoding="utf-8" ?>

    <site>

      <page>

        <h1>Blogpost</h1>

      </page>

    </site>

layouts/master.xsl:

    <?xml version="1.0" encoding="utf-8"?>

    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

      <xsl:output omit-xml-declaration="yes" indent="no"/>

      <xsl:template match="/">

        <xsl:value-of select="site/page/h1"/>

      </xsl:template>

    </xsl:stylesheet>

Rules:

    compile '*' do

      layout 'master'

    end

    route '*' do

      item.identifier.chop + '.' + item[:extension]

    end

    layout '/master/', :xsl

...and this is the full error:

    RuntimeError: compilation error: element site

    xsltParseStylesheetProcess : document is not a stylesheet

    Compilation stack:

      - [item]   /content/ (rep default)

    Stack trace:

      0. /Library/Ruby/Gems/1.8/gems/nokogiri-1.5.5/lib/nokogiri/xslt.rb:32:in `parse_stylesheet_doc'

      1. /Library/Ruby/Gems/1.8/gems/nokogiri-1.5.5/lib/nokogiri/xslt.rb:32:in `parse'

      2. /Library/Ruby/Gems/1.8/gems/nokogiri-1.5.5/lib/nokogiri/xslt.rb:13:in `XSLT'

      3. /Library/Ruby/Gems/1.8/gems/nanoc-3.4.2/lib/nanoc/filters/xsl.rb:39:in `run'

      4. /Library/Ruby/Gems/1.8/gems/nanoc-3.4.2/lib/nanoc/base/result_data/item_rep.rb:413:in `layout'

      5. /Library/Ruby/Gems/1.8/gems/nanoc-3.4.2/lib/nanoc/base/compilation/item_rep_proxy.rb:69:in `layout'

      6. /Library/Ruby/Gems/1.8/gems/nanoc-3.4.2/lib/nanoc/base/compilation/rule_context.rb:67:in `layout'

      7. ./Rules:22:in `load'

      8. /Library/Ruby/Gems/1.8/gems/nanoc-3.4.2/lib/nanoc/base/compilation/rule.rb:68:in `instance_eval'

      9. /Library/Ruby/Gems/1.8/gems/nanoc-3.4.2/lib/nanoc/base/compilation/rule.rb:68:in `apply_to'

      ... 23 more lines omitted. See full crash log for details.

Can anyone spot a problem? Am I doing something wrong?

[Denis Defreyne]

Hi Dan,

I’ll look into this soon, because this doesn’t look right!

Denis

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[Dan Brendstrup]

Thanks, Denis! I agree, it doesn't look right, so I hope you're better than me at finding the cause :)

Cheers,

Dan

[Denis Defreyne]

Hi Dan,

The XSL filter indeed did not work properly. I fixed it in the release-3.4.x branch here: https://github.com/ddfreyne/nanoc/commit/231a69ccd5e0a23afe053e28094cc93cf0245e74. Can you verify whether that one works for you?

It’ll be part of either 3.4.4 or 3.5.0, whichever comes first!

Denis

[Dan Brendstrup]

Yes indeed, that cured the problem! Awesome. Thanks for your help!

- Dan

On Sunday, January 13, 2013 4:32:17 PM UTC+1, Denis Defreyne wrote:

Hi Dan,

[Dan Brendstrup]

Hi Denis,

A quick bugfix, I think. I've been playing around with the XSL filter again, and although I'd swear everything seemed to work after your fix, it seems to be borked again.

The XSL stylesheet applies a transformation to itself rather than to the content to which the layout is applied. However, if I change line 39 from:

xml = ::Nokogiri::XML(content)

[https://github.com/nanoc/nanoc/blob/3.6.3/lib/nanoc/filters/xsl.rb#L39]

to this:

xml = ::Nokogiri::XML(assigns[:content])

...then it works. I'm stabbing in the dark here, but does that make sense to you?

- Dan

On Sunday, January 13, 2013 4:32:17 PM UTC+1, Denis Defreyne wrote:
Hi Dan,