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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2018 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 DOMNode; |
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use s9e\TextFormatter\Configurator\Helpers\XPathHelper; |
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/** |
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* Merge xsl:when branches if they have identical content |
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* |
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* NOTE: may fail if branches have identical equality expressions, e.g. "@a=1" and "@a=1" |
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*/ |
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class MergeIdenticalConditionalBranches 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 = ['//xsl:choose']; |
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/** |
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* Collect consecutive xsl:when elements that share the same kind of equality tests |
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* |
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* Will return xsl:when elements that test a constant part (e.g. a literal) against the same |
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* variable part (e.g. the same attribute) |
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* |
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* @param DOMNode $node First node to inspect |
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* @return DOMElement[] |
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*/ |
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protected function collectCompatibleBranches(DOMNode $node) |
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{ |
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$nodes = []; |
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$key = null; |
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$values = []; |
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while ($node && $this->isXsl($node, 'when')) |
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{ |
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$branch = XPathHelper::parseEqualityExpr($node->getAttribute('test')); |
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if ($branch === false || count($branch) !== 1) |
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{ |
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// The expression is not entirely composed of equalities, or they have a different |
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// variable part |
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break; |
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} |
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if (isset($key) && key($branch) !== $key) |
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{ |
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// Not the same variable as our branches |
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break; |
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} |
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if (array_intersect($values, end($branch))) |
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{ |
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// Duplicate values across branches, e.g. ".=1 or .=2" and ".=2 or .=3" |
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break; |
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} |
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$key = key($branch); |
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$values = array_merge($values, end($branch)); |
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// Record this node then move on to the next sibling |
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$nodes[] = $node; |
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$node = $node->nextSibling; |
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} |
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return $nodes; |
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} |
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/** |
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* Merge identical xsl:when elements from a list |
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* |
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* @param DOMElement[] $nodes |
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* @return void |
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*/ |
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protected function mergeBranches(array $nodes) |
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{ |
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$sortedNodes = []; |
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foreach ($nodes as $node) |
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{ |
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$outerXML = $node->ownerDocument->saveXML($node); |
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$innerXML = preg_replace('([^>]+>(.*)<[^<]+)s', '$1', $outerXML); |
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$sortedNodes[$innerXML][] = $node; |
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} |
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foreach ($sortedNodes as $identicalNodes) |
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{ |
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if (count($identicalNodes) < 2) |
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{ |
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continue; |
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} |
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$expr = []; |
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foreach ($identicalNodes as $i => $node) |
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{ |
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$expr[] = $node->getAttribute('test'); |
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if ($i > 0) |
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{ |
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$node->parentNode->removeChild($node); |
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} |
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} |
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$identicalNodes[0]->setAttribute('test', implode(' or ', $expr)); |
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} |
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} |
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/** |
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* Inspect the branches of an xsl:choose element and merge branches if their content is identical |
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* and their order does not matter |
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* |
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* @param DOMElement $choose xsl:choose element |
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* @return void |
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*/ |
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protected function mergeCompatibleBranches(DOMElement $choose) |
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{ |
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$node = $choose->firstChild; |
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while ($node) |
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{ |
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$nodes = $this->collectCompatibleBranches($node); |
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if (count($nodes) > 1) |
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{ |
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$node = end($nodes)->nextSibling; |
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// Try to merge branches if there's more than one of them |
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$this->mergeBranches($nodes); |
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} |
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else |
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{ |
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$node = $node->nextSibling; |
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} |
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} |
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} |
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/** |
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* Inspect the branches of an xsl:choose element and merge consecutive branches if their content |
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* is identical |
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* |
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* @param DOMElement $choose xsl:choose element |
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* @return void |
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*/ |
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protected function mergeConsecutiveBranches(DOMElement $choose) |
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{ |
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// Try to merge consecutive branches even if their test conditions are not compatible, |
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// e.g. "@a=1" and "@b=2" |
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$nodes = []; |
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foreach ($choose->childNodes as $node) |
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{ |
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if ($this->isXsl($node, 'when')) |
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{ |
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$nodes[] = $node; |
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} |
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} |
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$i = count($nodes); |
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while (--$i > 0) |
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{ |
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$this->mergeBranches([$nodes[$i - 1], $nodes[$i]]); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function normalizeElement(DOMElement $element) |
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{ |
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$this->mergeCompatibleBranches($element); |
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$this->mergeConsecutiveBranches($element); |
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} |
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} |
s9e /
TextFormatter
