103 lines
4.5 KiB
HTML
103 lines
4.5 KiB
HTML
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>sxml apply-templates (Guile Reference Manual)</title>
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<div class="subsection-level-extent" id="sxml-apply_002dtemplates">
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Previous: <a href="sxml-ssax-input_002dparse.html" accesskey="p" rel="prev">(sxml ssax input-parse)</a>, Up: <a href="SXML.html" accesskey="u" rel="up">SXML</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsection" id="g_t_0028sxml-apply_002dtemplates_0029"><span>7.21.8 (sxml apply-templates)<a class="copiable-link" href="#g_t_0028sxml-apply_002dtemplates_0029"> ¶</a></span></h4>
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<ul class="mini-toc">
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<li><a href="#Overview-4" accesskey="1">Overview</a></li>
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<li><a href="#Usage-4" accesskey="2">Usage</a></li>
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</ul>
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<div class="subsubsection-level-extent" id="Overview-4">
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<h4 class="subsubsection"><span>7.21.8.1 Overview<a class="copiable-link" href="#Overview-4"> ¶</a></span></h4>
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<p>Pre-order traversal of a tree and creation of a new tree:
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</p>
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<div class="example smallexample">
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<pre class="example-preformatted"> apply-templates:: tree x <templates> -> <new-tree>
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</pre></div>
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<p>where
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</p>
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<div class="example smallexample">
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<pre class="example-preformatted"> <templates> ::= (<template> ...)
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<template> ::= (<node-test> <node-test> ... <node-test> . <handler>)
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<node-test> ::= an argument to node-typeof? above
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<handler> ::= <tree> -> <new-tree>
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</pre></div>
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<p>This procedure does a <em class="emph">normal</em>, pre-order traversal of an SXML
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tree. It walks the tree, checking at each node against the list of
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matching templates.
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</p>
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<p>If the match is found (which must be unique, i.e., unambiguous), the
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corresponding handler is invoked and given the current node as an
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argument. The result from the handler, which must be a <code class="code"><tree></code>,
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takes place of the current node in the resulting tree. The name of the
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function is not accidental: it resembles rather closely an
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<code class="code">apply-templates</code> function of XSLT.
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</p>
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</div>
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<div class="subsubsection-level-extent" id="Usage-4">
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<h4 class="subsubsection"><span>7.21.8.2 Usage<a class="copiable-link" href="#Usage-4"> ¶</a></span></h4>
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<dl class="first-deffn">
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<dt class="deffn" id="index-apply_002dtemplates"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">apply-templates</strong> <var class="def-var-arguments">tree templates</var><a class="copiable-link" href="#index-apply_002dtemplates"> ¶</a></span></dt>
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</dl>
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