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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2019 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 Exception; |
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use s9e\TextFormatter\Utils\XPath; |
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class FoldConstantXPathExpressions extends AbstractConstantFolding |
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{ |
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/** |
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* @var string[] List of supported XPath functions |
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*/ |
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protected $supportedFunctions = [ |
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'boolean', |
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'ceiling', |
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'concat', |
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'contains', |
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'floor', |
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'normalize-space', |
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'not', |
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'number', |
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'round', |
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'starts-with', |
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'string', |
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'string-length', |
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'substring', |
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'substring-after', |
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'substring-before', |
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'translate' |
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]; |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function getOptimizationPasses() |
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{ |
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return [ |
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'(^(?:"[^"]*"|\'[^\']*\'|\\.[0-9]|[^"$&\'./:@[\\]])++$)' => 'foldConstantXPathExpression' |
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]; |
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} |
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/** |
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* 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->isConstantExpression($expr)) |
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{ |
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try |
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{ |
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$result = $this->evaluate($expr); |
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$foldedExpr = XPath::export($result); |
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$expr = $this->selectReplacement($expr, $foldedExpr); |
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} |
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catch (Exception $e) |
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{ |
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// Do nothing |
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} |
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} |
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return $expr; |
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} |
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/** |
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* Test whether given expression seems to be constant |
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* |
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* @param string $expr |
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* @return bool |
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*/ |
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protected function isConstantExpression($expr) |
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{ |
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// Replace strings to avoid false-positives |
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$expr = preg_replace('("[^"]*"|\'[^\']*\')', '0', $expr); |
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// Match function calls against the list of supported functions |
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preg_match_all('(\\w[-\\w]+(?=\\())', $expr, $m); |
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if (count(array_diff($m[0], $this->supportedFunctions)) > 0) |
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{ |
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return false; |
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} |
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// Match unsupported characters and keywords, as well as function calls without arguments |
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return !preg_match('([^\\s!\\-0-9<=>a-z\\(-.]|\\.(?![0-9])|\\b[-a-z](?![-\\w]+\\()|\\(\\s*\\))i', $expr); |
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} |
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/** |
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* Select the best replacement for given expression |
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* |
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* @param string $expr Original expression |
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* @param string $foldedExpr Folded expression |
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* @return string |
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*/ |
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protected function selectReplacement($expr, $foldedExpr) |
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{ |
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// Use the folded expression if it's smaller or it's a boolean |
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if (strlen($foldedExpr) < strlen($expr) || $foldedExpr === 'false()' || $foldedExpr === 'true()') |
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{ |
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return $foldedExpr; |
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} |
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return $expr; |
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} |
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} |
s9e /
TextFormatter
