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<a href="genshi-module.html">Package genshi</a> ::
<a href="genshi.filters-module.html">Package filters</a> ::
Module transform
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<!-- ==================== MODULE DESCRIPTION ==================== -->
<h1 class="epydoc">Module transform</h1><p class="nomargin-top"></p>
<p>A filter for functional-style transformations of markup streams.</p>
<p>The <a href="genshi.filters.transform.Transformer-class.html" class="link">Transformer</a> filter provides a variety of transformations that can be
applied to parts of streams that match given XPath expressions. These
transformations can be chained to achieve results that would be comparitively
tedious to achieve by writing stream filters by hand. The approach of chaining
node selection and transformation has been inspired by the <a class="rst-reference external" href="http://jquery.com/" target="_top">jQuery</a> Javascript
library.</p>
<blockquote>
</blockquote>
<p>For example, the following transformation removes the <tt class="rst-docutils literal"><title></tt> element from
the <tt class="rst-docutils literal"><head></tt> of the input document:</p>
<pre class="py-doctest">
<span class="py-prompt">>>> </span><span class="py-keyword">from</span> genshi.builder <span class="py-keyword">import</span> tag
<span class="py-prompt">>>> </span>html = HTML(<span class="py-string">'''<html></span>
<span class="py-more">... </span><span class="py-string"> <head><title>Some Title</title></head></span>
<span class="py-more">... </span><span class="py-string"> <body></span>
<span class="py-more">... </span><span class="py-string"> Some <em>body</em> text.</span>
<span class="py-more">... </span><span class="py-string"> </body></span>
<span class="py-more">... </span><span class="py-string"></html>'''</span>,
<span class="py-more">... </span>encoding=<span class="py-string">'utf-8'</span>)
<span class="py-prompt">>>> </span><span class="py-keyword">print</span>(html | Transformer(<span class="py-string">'body/em'</span>).map(unicode.upper, TEXT)
<span class="py-more">... </span> .unwrap().wrap(tag.u))
<span class="py-output"><html></span>
<span class="py-output"> <head><title>Some Title</title></head></span>
<span class="py-output"> <body></span>
<span class="py-output"> Some <u>BODY</u> text.</span>
<span class="py-output"> </body></span>
<span class="py-output"></html></span></pre>
<p>The <tt class="rst-docutils literal">Transformer</tt> support a large number of useful transformations out of the
box, but custom transformations can be added easily.</p>
<hr />
<div class="fields"> <p><strong>Since:</strong>
version 0.5
</p>
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<span class="summary-type"> </span>
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<a href="genshi.filters.transform.Transformer-class.html" class="summary-name">Transformer</a><br />
Stream filter that can apply a variety of different transformations to
a stream.
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<span class="summary-type"> </span>
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<a href="genshi.filters.transform.InjectorTransformation-class.html" class="summary-name">InjectorTransformation</a><br />
Abstract base class for transformations that inject content into a
stream.
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<span class="summary-type"> </span>
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<a href="genshi.filters.transform.StreamBuffer-class.html" class="summary-name">StreamBuffer</a><br />
Stream event buffer used for cut and copy transformations.
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<a name="ENTER"></a><span class="summary-name">ENTER</span> = <code title="'ENTER'">'ENTER'</code><br />
Stream augmentation mark indicating that a selected element is being
entered.
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<span class="summary-type"> </span>
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<a name="INSIDE"></a><span class="summary-name">INSIDE</span> = <code title="'INSIDE'">'INSIDE'</code><br />
Stream augmentation mark indicating that processing is currently inside a
selected element.
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<span class="summary-type"> </span>
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<a name="OUTSIDE"></a><span class="summary-name">OUTSIDE</span> = <code title="'OUTSIDE'">'OUTSIDE'</code><br />
Stream augmentation mark indicating that a match occurred outside a selected
element.
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<span class="summary-type"> </span>
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<a name="EXIT"></a><span class="summary-name">EXIT</span> = <code title="'EXIT'">'EXIT'</code><br />
Stream augmentation mark indicating that a selected element is being
exited.
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<span class="summary-type"> </span>
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<a href="genshi.filters.transform-module.html#BREAK" class="summary-name">BREAK</a> = <code title="'BREAK'">'BREAK'</code><br />
Stream augmentation mark indicating a break between two otherwise contiguous
blocks of marked events.
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<span class="table-header">Variables Details</span></td>
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<a name="BREAK"></a>
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<h3 class="epydoc">BREAK</h3>
<p>Stream augmentation mark indicating a break between two otherwise contiguous
blocks of marked events.</p>
<p>This is used primarily by the cut() transform to provide later transforms with
an opportunity to operate on the cut buffer.</p>
<dl class="fields">
</dl>
<dl class="fields">
<dt>Value:</dt>
<dd><table><tr><td><pre class="variable">
'BREAK'
</pre></td></tr></table>
</dd>
</dl>
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