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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2017 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Configurator\TemplateNormalizations; |
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use DOMAttr; |
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use DOMElement; |
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use s9e\TextFormatter\Configurator\Helpers\AVTHelper; |
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abstract class AbstractConstantFolding extends AbstractNormalization |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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protected $queries = [ |
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'//*[namespace-uri() != $XSL]/@*[contains(.,"{")]', |
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'//xsl:value-of' |
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]; |
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/** |
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* Return the optimization passes supported by the concrete implementation |
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* |
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* @return array Regexps as keys, method names as values |
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*/ |
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abstract protected function getOptimizationPasses(); |
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/** |
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* Evaluate given expression and return the result |
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* |
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* @param string $expr |
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* @return string |
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*/ |
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protected function evaluateExpression($expr) |
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{ |
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$original = $expr; |
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foreach ($this->getOptimizationPasses() as $regexp => $methodName) |
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{ |
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$regexp = str_replace(' ', '\\s*', $regexp); |
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$expr = preg_replace_callback($regexp, [$this, $methodName], $expr); |
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} |
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return ($expr === $original) ? $expr : $this->evaluateExpression(trim($expr)); |
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} |
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/** |
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* Replace constant expressions in given AVT |
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* |
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* @param DOMAttr $attribute |
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* @return void |
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*/ |
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protected function normalizeAttribute(DOMAttr $attribute) |
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{ |
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AVTHelper::replace( |
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$attribute, |
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function ($token) |
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{ |
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if ($token[0] === 'expression') |
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{ |
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$token[1] = $this->evaluateExpression($token[1]); |
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} |
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return $token; |
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} |
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); |
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} |
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/** |
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* Replace constant expressions in given xsl:value-of element |
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* |
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* @param DOMElement $valueOf |
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* @return void |
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*/ |
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protected function normalizeElement(DOMElement $valueOf) |
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{ |
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$valueOf->setAttribute('select', $this->evaluateExpression($valueOf->getAttribute('select'))); |
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} |
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} |
s9e /
TextFormatter
