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RE: How do you pass step options to p:data/@href???

From: Philip Fennell <Philip.Fennell@bbc.co.uk>
Date: Fri, 1 May 2009 09:10:12 +0100
Message-ID: <F3685F4A877F284F8054E328390447D14C6E7E@bbcxues17.national.core.bbc.co.uk>
To: "XProc Dev" <xproc-dev@w3.org>
Thanks Norm, but I don't hink that helps.

> If you're reading a document flowing through a pipeline, then it is
XML.

That's exactly what I'm not trying to do. I'm wanting to invoke Tidy on
an HTML document that is not well-formed XML so that I can do further
processing on it. Therefore I need to use p:data to get hold of a
non-XML document. My problem is that p:data, and p:document for that
matter, do not allow you to use p:with-option so that you can use an
expression (XPath) instead of a string literal (URI).

I can get around the p:document problem by using p:load, but I cannot
see an equivalent for this particular use-case; and I imagine it will be
a popular use-case if people want to use XProc to build legacy-content
conversion pipelines where they may have large amounts of pages in
HTML/SGML or do screen-scrapping off of existing web sites.


Regards

Philip Fennell



-----Original Message-----
From: xproc-dev-request@w3.org [mailto:xproc-dev-request@w3.org] On
Behalf Of Norman Walsh
Sent: 30 April 2009 17:51
To: XProc Dev
Subject: Re: How do you pass step options to p:data/@href???

Philip Fennell <Philip.Fennell@bbc.co.uk> writes:
[...]
> It works fine as it is, but, I'd like to use the 'href' option I've 
> declared for the step to pass in the location of the source HTML file.
> However, the value of: p:data/@href won't take an expression e.g. 
> $href and p:data doesn't allow <p:with-option name="href" 
> select="$href"/>
>
> How do I pass the HTML source document URI to p:data as there is no 
> other mechanism to get hold of unparsed character data?

Use p:pipe to connect the source port of the exec command to the source
port on your declared step, like this:

  <p:declare-step name="main" type="tidy:html">
    <p:input port="source"/>
    <p:output port="result"/>
    <p:option name="href"/>

    <p:exec command="tidy"
        source-is-xml="true"
        result-is-xml="false"
        wrap-result-lines="false"
        method="xml">
      <p:input port="source">
        <p:pipe step="main" port="source"/>
      </p:input>
      <p:with-option name="args" select="'--quiet yes --show-warnings no
  --doctype omit --numeric-entities yes --output-xml yes'"/>
    </p:exec>

    <p:unescape-markup/>
    <p:unwrap match="c:result"/>
  </p:declare-step>

Note that I added a name to your declare step and changed source-is-xml
to true. If you're reading a document flowing through a pipeline, then
it is XML.

Since the source is the default readable port, you could also do this:

  <p:declare-step type="tidy:html">
    <p:input port="source"/>
    <p:output port="result"/>
    <p:option name="href"/>

    <p:exec command="tidy"
        source-is-xml="true"
        result-is-xml="false"
        wrap-result-lines="false"
        method="xml">
      <p:with-option name="args" select="'--quiet yes --show-warnings no
  --doctype omit --numeric-entities yes --output-xml yes'"/>
    </p:exec>

By default, the source port on p:exec will be connected to the default
readable port, which is the source port on your declare step in this
case.

                                        Be seeing you,
                                          norm

--
Norman Walsh <ndw@nwalsh.com> | It is well to remember that the entire
http://nwalsh.com/            | universe, with one trifling exception,
                              | is composed of others.--John Andrew
                              | Holmes

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Received on Friday, 1 May 2009 08:10:48 GMT

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