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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 DOMElement; |
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use DOMText; |
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class OptimizeChooseText extends AbstractChooseOptimization |
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{ |
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/** |
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* Adjust length of the text nodes of current xsl:choose element's branches |
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* |
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* @param string $childType Either firstChild or lastChild |
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* @param integer $pos |
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* @param integer $len |
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* @return void |
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*/ |
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protected function adjustTextNodes($childType, $pos, $len = PHP_INT_MAX) |
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{ |
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foreach ($this->getBranches() as $branch) |
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{ |
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$node = $branch->$childType; |
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$node->nodeValue = substr($node->textContent, $pos, $len); |
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} |
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} |
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/** |
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* Compute the number of leading characters common to all strings |
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* |
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* @param string[] $strings |
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* @return integer |
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*/ |
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protected function getPrefixLength(array $strings) |
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{ |
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$i = 0; |
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$len = 0; |
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$maxLen = min(array_map('strlen', $strings)); |
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while ($i < $maxLen) |
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{ |
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$c = $strings[0][$i]; |
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foreach ($strings as $string) |
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{ |
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if ($string[$i] !== $c) |
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{ |
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break 2; |
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} |
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} |
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$len = ++$i; |
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} |
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return $len; |
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} |
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/** |
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* Get the text content of the firstChild/lastChild of each branch if they are all text nodes |
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* |
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* @param string $childType Either firstChild or lastChild |
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* @return string[] List of strings or an empty array |
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*/ |
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protected function getTextContent($childType) |
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{ |
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$strings = []; |
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foreach ($this->getBranches() as $branch) |
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{ |
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if (!($branch->$childType instanceof DOMText)) |
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{ |
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return []; |
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} |
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$strings[] = $branch->$childType->textContent; |
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} |
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return $strings; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function optimizeChoose() |
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{ |
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if (!$this->hasOtherwise()) |
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{ |
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return; |
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} |
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$this->optimizeLeadingText(); |
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$this->optimizeTrailingText(); |
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} |
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/** |
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* Move common leading text outside of current choose |
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* |
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* @return void |
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*/ |
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protected function optimizeLeadingText() |
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{ |
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$strings = $this->getTextContent('firstChild'); |
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if (empty($strings)) |
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{ |
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return; |
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} |
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$len = $this->getPrefixLength($strings); |
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if ($len) |
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{ |
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$this->adjustTextNodes('firstChild', $len); |
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$this->choose->parentNode->insertBefore( |
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$this->createTextNode(substr($strings[0], 0, $len)), |
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$this->choose |
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); |
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} |
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} |
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/** |
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* Move common trailing text outside of current choose |
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* |
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* @return void |
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*/ |
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protected function optimizeTrailingText() |
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{ |
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$strings = $this->getTextContent('lastChild'); |
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if (empty($strings)) |
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{ |
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return; |
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} |
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// Flip the strings before computing the prefix length to get the suffix length |
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$len = $this->getPrefixLength(array_map('strrev', $strings)); |
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if ($len) |
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{ |
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$this->adjustTextNodes('lastChild', 0, -$len); |
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$this->choose->parentNode->insertBefore( |
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$this->createTextNode(substr($strings[0], -$len)), |
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$this->choose->nextSibling |
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); |
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} |
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} |
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} |
s9e /
TextFormatter
