File: lookup.key.html

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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>lookup.key</title><link rel="stylesheet" href="reference.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="../index.html" title="DocBook XSL Stylesheets: ReferenceDocumentation"><link rel="up" href="generallibrary.html" title="General Library Templates"><link rel="prev" href="pi-attribute.html" title="pi-attribute"><link rel="next" href="xpath.location.html" title="xpath.location"><link rel="copyright" href="copyright.html" title="License"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">lookup.key</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="pi-attribute.html">Prev</a></td><th width="60%" align="center">General Library Templates</th><td width="20%" align="right"><a accesskey="n" href="xpath.location.html">Next</a></td></tr></table><hr></div><div class="refentry" title="lookup.key"><a name="lookup.key"></a><div class="titlepage"></div>
<div class="refnamediv"><h2>lookup.key</h2><p>
lookup.key
 &#8212; Retrieve the value associated with a particular key in a table
</p></div>

<div class="refsect1" title="Description"><a name="id1456535"></a><h2>Description</h2>

<p>Given a table of space-delimited key/value pairs,
the <code class="function">lookup.key</code> template extracts the value associated
with a particular key.</p>

<a name="lookup.key.frag"></a><pre class="programlisting">
&lt;xsl:template name="lookup.key"&gt;
  &lt;xsl:param name="key" select="''"&gt;&lt;/xsl:param&gt;
  &lt;xsl:param name="table" select="''"&gt;&lt;/xsl:param&gt;

  &lt;xsl:if test="contains($table, ' ')"&gt;
    &lt;xsl:choose&gt;
      &lt;xsl:when test="substring-before($table, ' ') = $key"&gt;
        &lt;xsl:variable name="rest" select="substring-after($table, ' ')"&gt;&lt;/xsl:variable&gt;
        &lt;xsl:choose&gt;
          &lt;xsl:when test="contains($rest, ' ')"&gt;
            &lt;xsl:value-of select="substring-before($rest, ' ')"&gt;&lt;/xsl:value-of&gt;
          &lt;/xsl:when&gt;
          &lt;xsl:otherwise&gt;
            &lt;xsl:value-of select="$rest"&gt;&lt;/xsl:value-of&gt;
          &lt;/xsl:otherwise&gt;
        &lt;/xsl:choose&gt;
      &lt;/xsl:when&gt;
      &lt;xsl:otherwise&gt;
        &lt;xsl:call-template name="lookup.key"&gt;
          &lt;xsl:with-param name="key" select="$key"&gt;&lt;/xsl:with-param&gt;
          &lt;xsl:with-param name="table" select="substring-after(substring-after($table,' '), ' ')"&gt;&lt;/xsl:with-param&gt;
        &lt;/xsl:call-template&gt;
      &lt;/xsl:otherwise&gt;
    &lt;/xsl:choose&gt;
  &lt;/xsl:if&gt;
&lt;/xsl:template&gt;
</pre>

</div>
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