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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2016 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 DOMDocument; |
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use DOMXPath; |
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use s9e\TextFormatter\Configurator\Helpers\XPathHelper; |
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class FoldConstantXPathExpressions extends AbstractConstantFolding |
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{ |
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/** |
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* @var DOMXPath |
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*/ |
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protected $xpath; |
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/** |
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* Constructor |
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*/ |
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public function __construct() |
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{ |
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$this->xpath = new DOMXPath(new DOMDocument); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function getOptimizationPasses() |
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{ |
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return [ |
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'(^(?:"[^"]*"|\'[^\']*\'|\\.[0-9]|[^"$&\'./:<=>@[\\]])++$)' => 'foldConstantXPathExpression' |
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]; |
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} |
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/** |
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* Test whether a value can be serialized to an XPath literal |
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* |
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* @param mixed $value |
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* @return bool |
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*/ |
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protected function canBeSerialized($value) |
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{ |
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return (is_string($value) || is_integer($value) || is_float($value)); |
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} |
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/** |
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* Test whether given string contains an unsupported expression |
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* |
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* Will test for keywords, nodes and node functions as well as a few unsupported functions |
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* such as format-number() |
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* |
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* @link https://www.w3.org/TR/xpath/#section-Node-Set-Functions |
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* @link https://www.w3.org/TR/xslt#add-func |
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* |
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* @param string $expr |
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* @return bool |
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*/ |
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protected function containsUnsupportedExpression($expr) |
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{ |
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// Remove strings to avoid false-positives |
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$expr = preg_replace('("[^"]*"|\'[^\']*\')', '', $expr); |
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return (bool) preg_match('([a-z](?![a-z\\(])|(?:comment|text|processing-instruction|node|last|position|count|id|local-name|namespace-uri|name|document|key|format-number|current|unparsed-entity-uri|generate-id|system-property)\\()i', $expr); |
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} |
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/** |
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* Evaluate given expression without raising any warnings |
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* |
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* @param string $expr |
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* @return mixed |
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*/ |
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protected function evaluate($expr) |
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{ |
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$useErrors = libxml_use_internal_errors(true); |
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$result = $this->xpath->evaluate($expr); |
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libxml_use_internal_errors($useErrors); |
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return $result; |
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} |
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/** |
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* Evaluate and replace a constant XPath expression |
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* |
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* @param array $m |
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* @return string |
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*/ |
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protected function foldConstantXPathExpression(array $m) |
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{ |
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$expr = $m[0]; |
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if (!$this->containsUnsupportedExpression($expr)) |
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{ |
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$result = $this->evaluate($expr); |
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if ($this->canBeSerialized($result)) |
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{ |
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$foldedExpr = XPathHelper::export($result); |
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if (strlen($foldedExpr) < strlen($expr)) |
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{ |
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$expr = $foldedExpr; |
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} |
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} |
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} |
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return $expr; |
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} |
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} |
s9e /
TextFormatter
