104 lines
4.5 KiB
HTML
104 lines
4.5 KiB
HTML
|
<!DOCTYPE html>
|
||
|
|
<html>
|
||
|
|
<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<!-- This manual documents Guile version 3.0.10.
|
||
|
|
|
||
|
|
Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
|
||
|
|
Inc.
|
||
|
|
|
||
|
|
Copyright (C) 2021 Maxime Devos
|
||
|
|
|
||
|
|
Copyright (C) 2024 Tomas Volf
|
||
|
|
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
||
|
|
any later version published by the Free Software Foundation; with no
|
||
|
|
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
|
||
|
|
copy of the license is included in the section entitled "GNU Free
|
||
|
|
Documentation License." -->
|
||
|
|
<title>sxml apply-templates (Guile Reference Manual)</title>
|
||
|
|
|
||
|
|
<meta name="description" content="sxml apply-templates (Guile Reference Manual)">
|
||
|
|
<meta name="keywords" content="sxml apply-templates (Guile Reference Manual)">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content=".texi2any-real">
|
||
|
|
<meta name="viewport" content="width=device-width,initial-scale=1">
|
||
|
|
|
||
|
|
<link href="index.html" rel="start" title="Top">
|
||
|
|
<link href="Concept-Index.html" rel="index" title="Concept Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="SXML.html" rel="up" title="SXML">
|
||
|
|
<link href="sxml-ssax-input_002dparse.html" rel="prev" title="sxml ssax input-parse">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
span:hover a.copiable-link {visibility: visible}
|
||
|
|
strong.def-name {font-family: monospace; font-weight: bold; font-size: larger}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en">
|
||
|
|
<div class="subsection-level-extent" id="sxml-apply_002dtemplates">
|
||
|
|
<div class="nav-panel">
|
||
|
|
<p>
|
||
|
|
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>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<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>
|
||
|
|
<ul class="mini-toc">
|
||
|
|
<li><a href="#Overview-4" accesskey="1">Overview</a></li>
|
||
|
|
<li><a href="#Usage-4" accesskey="2">Usage</a></li>
|
||
|
|
</ul>
|
||
|
|
<div class="subsubsection-level-extent" id="Overview-4">
|
||
|
|
<h4 class="subsubsection"><span>7.21.8.1 Overview<a class="copiable-link" href="#Overview-4"> ¶</a></span></h4>
|
||
|
|
<p>Pre-order traversal of a tree and creation of a new tree:
|
||
|
|
</p>
|
||
|
|
<div class="example smallexample">
|
||
|
|
<pre class="example-preformatted"> apply-templates:: tree x <templates> -> <new-tree>
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>where
|
||
|
|
</p>
|
||
|
|
<div class="example smallexample">
|
||
|
|
<pre class="example-preformatted"> <templates> ::= (<template> ...)
|
||
|
|
<template> ::= (<node-test> <node-test> ... <node-test> . <handler>)
|
||
|
|
<node-test> ::= an argument to node-typeof? above
|
||
|
|
<handler> ::= <tree> -> <new-tree>
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>This procedure does a <em class="emph">normal</em>, pre-order traversal of an SXML
|
||
|
|
tree. It walks the tree, checking at each node against the list of
|
||
|
|
matching templates.
|
||
|
|
</p>
|
||
|
|
<p>If the match is found (which must be unique, i.e., unambiguous), the
|
||
|
|
corresponding handler is invoked and given the current node as an
|
||
|
|
argument. The result from the handler, which must be a <code class="code"><tree></code>,
|
||
|
|
takes place of the current node in the resulting tree. The name of the
|
||
|
|
function is not accidental: it resembles rather closely an
|
||
|
|
<code class="code">apply-templates</code> function of XSLT.
|
||
|
|
</p>
|
||
|
|
</div>
|
||
|
|
<div class="subsubsection-level-extent" id="Usage-4">
|
||
|
|
<h4 class="subsubsection"><span>7.21.8.2 Usage<a class="copiable-link" href="#Usage-4"> ¶</a></span></h4>
|
||
|
|
<dl class="first-deffn">
|
||
|
|
<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>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|