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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 DOMElement; |
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class OptimizeChooseDeadBranches extends AbstractChooseOptimization |
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{ |
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/** |
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* Test whether given XPath expression is always false |
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* |
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* @param string $expr |
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* @return bool |
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*/ |
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protected function isAlwaysFalse($expr) |
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{ |
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// Always false: empty strings, 0, or false() |
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$regexp = '(^(?:""|\'\'|0|0*\\.0+|false\\s*\\(\\s*\\))$)'; |
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return (bool) preg_match($regexp, trim($expr)); |
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} |
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/** |
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* Test whether given XPath expression is always true |
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* |
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* @param string $expr |
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* @return bool |
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*/ |
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protected function isAlwaysTrue($expr) |
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{ |
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// Always true: non-empty strings, non-0 numbers, or true() |
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$regexp = '(^(?:"[^"]++"|\'[^\']++\'|0[0-9]+|[1-9][0-9]*|[0-9]*\\.0*[1-9][0-9]*|true\\s*\\(\\s*\\))$)'; |
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return (bool) preg_match($regexp, trim($expr)); |
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} |
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/** |
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* Convert given xsl:when element into an xsl:otherwise element |
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* |
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* @param DOMElement $when |
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* @return void |
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*/ |
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protected function makeOtherwise(DOMElement $when) |
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{ |
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$otherwise = $this->createElement('xsl:otherwise'); |
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while ($when->firstChild) |
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$otherwise->appendChild($when->firstChild); |
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} |
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$when->parentNode->replaceChild($otherwise, $when); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function optimizeChoose() |
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{ |
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$removeAll = false; |
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$tests = []; |
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foreach ($this->getBranches() as $branch) |
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{ |
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$test = trim($branch->getAttribute('test')); |
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if ($removeAll || isset($tests[$test]) || $this->isAlwaysFalse($test)) |
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{ |
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$branch->parentNode->removeChild($branch); |
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} |
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elseif ($this->isAlwaysTrue($test)) |
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{ |
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$removeAll = true; |
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$this->makeOtherwise($branch); |
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} |
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$tests[$test] = 1; |
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} |
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} |
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} |
s9e /
TextFormatter
