<?php
/**
* @package s9e\TextFormatter
* @copyright Copyright (c) 2010-2021 The s9e authors
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
namespace s9e\TextFormatter\Configurator\TemplateNormalizations;
use DOMElement;
/**
* Remove unnecessary <xsl:if> tests around <xsl:value-of>
*
* NOTE: should be performed before attributes are inlined for maximum effect
*/
class OptimizeConditionalValueOf extends AbstractNormalization
{
/**
* {@inheritdoc}
*/
protected $queries = ['//xsl:if[count(descendant::node()) = 1]/xsl:value-of'];
/**
* {@inheritdoc}
*/
protected function normalizeElement(DOMElement $element)
{
$if = $element->parentNode;
$test = $if->getAttribute('test');
$select = $element->getAttribute('select');
// Ensure that the expressions match, and that they select one single attribute
if ($select !== $test || !preg_match('#^@[-\\w]+$#D', $select))
{
return;
}
// Replace the xsl:if element with the xsl:value-of element
$if->parentNode->replaceChild($if->removeChild($element), $if);
}
}