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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta name="generator" content="plasTeX" />
<meta content="text/html; charset=utf-8" http-equiv="content-type" />
<title>plasTeX — A Python Framework for Processing LaTeX Documents: Simple Renderer Example</title>

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<span>
<b class="current">Simple Renderer Example</b>
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<div><h1 id="a0000000012">5.1 Simple Renderer Example</h1>
<p>It is possible to write a renderer with just a couple of methods: <tt class="ttfamily">default</tt> and <tt class="ttfamily">textDefault</tt>. The code below demonstrates how one might create a generic XML renderer that simply uses the node names as XML tag names. The text node renderer escapes the &lt;, &gt;, and &amp; characters. </p><pre>
import string
from plasTeX.Renderers import Renderer

class Renderer(Renderer):
    
    def default(self, node):
        """ Rendering method for all non-text nodes """
        s = []

        # Handle characters like \&amp;, \$, \%, etc.
        if len(node.nodeName) == 1 and node.nodeName not in string.letters:
            return self.textDefault(node.nodeName)

        # Start tag
        s.append('&lt;%s&gt;' % node.nodeName)

        # See if we have any attributes to render
        if node.hasAttributes():
            s.append('&lt;attributes&gt;')
            for key, value in node.attributes.items():
                # If the key is 'self', don't render it
                # these nodes are the same as the child nodes
                if key == 'self':
                    continue
                s.append('&lt;%s&gt;%s&lt;/%s&gt;' % (key, unicode(value), key))
            s.append('&lt;/attributes&gt;')

        # Invoke rendering on child nodes
        s.append(unicode(node))

        # End tag
        s.append('&lt;/%s&gt;' % node.nodeName)

        return u'\n'.join(s)

    def textDefault(self, node):
        """ Rendering method for all text nodes """
        return node.replace('&amp;','&amp;amp;').replace('&lt;','&amp;lt;').replace('&gt;','&amp;gt;')
</pre><p>To use the renderer, simply parse a L<sup style="font-variant:small-caps; margin-left:-0.3em">a</sup>T<sub style="text-transform:uppercase; margin-left:-0.2em">e</sub>X document and apply the renderer using the <tt class="ttfamily">render</tt> method. </p><pre>
# Import renderer from previous code sample
from MyRenderer import Renderer

from plasTeX.TeX import TeX

# Instantiate a TeX processor and parse the input text
tex = TeX()
tex.ownerDocument.config['files']['split-level'] = -100
tex.ownerDocument.config['files']['filename'] = 'test.xml'
tex.input(r'''
\documentclass{book}
\begin{document}

Previous paragraph.

\section{My Section}

\begin{center}
Centered text with &lt;, &gt;, and \&amp; charaters.
\end{center}

Next paragraph.

\end{document}
''')
document = tex.parse()

# Render the document
renderer = Renderer()
renderer.render(document)
</pre><p>The output from the renderer, located in ‘<span class="sffamily">test.xml</span>’, looks like the following. </p><pre>
&lt;document&gt;
&lt;par&gt;
Previous paragraph.
&lt;/par&gt;&lt;section&gt;
    &lt;attributes&gt;
        &lt;toc&gt;None&lt;/toc&gt;
        &lt;*modifier*&gt;None&lt;/*modifier*&gt;
        &lt;title&gt;My Section&lt;/title&gt;
    &lt;/attributes&gt;
&lt;par&gt;
&lt;center&gt;
 Centered text with &amp;lt;, &amp;gt;, and &amp;amp; charaters.
&lt;/center&gt;
&lt;/par&gt;&lt;par&gt;
Next paragraph.
&lt;/par&gt;
&lt;/section&gt;
&lt;/document&gt;
</pre></div>

<div class="contents section-contents"><!--<strong>Subsections</strong>-->
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<li><a href="sect0012.html">5.1.1 Extending the Simple Renderer</a>
   
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