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AbstractChooseOptimization.php
001 <?php
002
003 /**
004 * @package s9e\TextFormatter
005 * @copyright Copyright (c) 2010-2022 The s9e authors
006 * @license http://www.opensource.org/licenses/mit-license.php The MIT License
007 */
008 namespace s9e\TextFormatter\Configurator\TemplateNormalizations;
009
010 use DOMElement;
011 use DOMNode;
012
013 abstract class AbstractChooseOptimization extends AbstractNormalization
014 {
015 /**
016 * @var DOMElement Current xsl:choose element
017 */
018 protected $choose;
019
020 /**
021 * {@inheritdoc}
022 */
023 protected $queries = ['//xsl:choose'];
024
025 /**
026 * Retrieve a list of attributes from given element
027 *
028 * @return array NamespaceURI#nodeName as keys, attribute values as values
029 */
030 protected function getAttributes(DOMElement $element)
031 {
032 $attributes = array();
033 foreach ($element->attributes as $attribute)
034 {
035 $key = $attribute->namespaceURI . '#' . $attribute->nodeName;
036 $attributes[$key] = $attribute->nodeValue;
037 }
038
039 return $attributes;
040 }
041
042 /**
043 * Return a list the xsl:when and xsl:otherwise children of current xsl:choose element
044 *
045 * @return DOMElement[]
046 */
047 protected function getBranches()
048 {
049 $query = 'xsl:when|xsl:otherwise';
050
051 return $this->xpath($query, $this->choose);
052 }
053
054 /**
055 * Test whether current xsl:choose element has an xsl:otherwise child
056 *
057 * @return bool
058 */
059 protected function hasOtherwise()
060 {
061 return (bool) $this->xpath->evaluate('count(xsl:otherwise)', $this->choose);
062 }
063
064 /**
065 * Test whether current xsl:choose element has no content besides xsl:when and xsl:otherwise
066 *
067 * @return bool
068 */
069 protected function isEmpty()
070 {
071 $query = 'count(xsl:when/node() | xsl:otherwise/node())';
072
073 return !$this->xpath->evaluate($query, $this->choose);
074 }
075
076 /**
077 * Test whether two nodes are identical
078 *
079 * ext/dom does not support isEqualNode() from DOM Level 3 so this is a makeshift replacement.
080 * Unlike the DOM 3 function, attributes order matters
081 *
082 * @param DOMNode $node1
083 * @param DOMNode $node2
084 * @return bool
085 */
086 protected function isEqualNode(DOMNode $node1, DOMNode $node2)
087 {
088 return ($node1->ownerDocument->saveXML($node1) === $node2->ownerDocument->saveXML($node2));
089 }
090
091 /**
092 * Test whether two elements have the same start tag
093 *
094 * @param DOMElement $el1
095 * @param DOMElement $el2
096 * @return bool
097 */
098 protected function isEqualTag(DOMElement $el1, DOMElement $el2)
099 {
100 return ($el1->namespaceURI === $el2->namespaceURI && $el1->nodeName === $el2->nodeName && $this->getAttributes($el1) === $this->getAttributes($el2));
101 }
102
103 /**
104 * {@inheritdoc}
105 */
106 protected function normalizeElement(DOMElement $element)
107 {
108 $this->choose = $element;
109 $this->optimizeChoose();
110 }
111
112 /**
113 * Optimize the current xsl:choose element
114 *
115 * @return void
116 */
117 abstract protected function optimizeChoose();
118
119 /**
120 * {@inheritdoc}
121 */
122 protected function reset()
123 {
124 $this->choose = null;
125 parent::reset();
126 }
127 }