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- Veröffentlicht
- 28.08.2024
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OptimizeChooseText.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 DOMText;
012
013 class OptimizeChooseText extends AbstractChooseOptimization
014 {
015 /**
016 * Adjust length of the text nodes of current xsl:choose element's branches
017 *
018 * @param string $childType Either firstChild or lastChild
019 * @param integer $pos
020 * @param integer $len
021 * @return void
022 */
023 protected function adjustTextNodes($childType, $pos, $len = PHP_INT_MAX)
024 {
025 foreach ($this->getBranches() as $branch)
026 {
027 $node = $branch->$childType;
028 $node->nodeValue = substr($node->textContent, $pos, $len);
029 }
030 }
031
032 /**
033 * Compute the number of leading characters common to all strings
034 *
035 * @param string[] $strings
036 * @return integer
037 */
038 protected function getPrefixLength(array $strings)
039 {
040 $i = 0;
041 $len = 0;
042 $maxLen = min(array_map('strlen', $strings));
043 while ($i < $maxLen)
044 {
045 $c = $strings[0][$i];
046 foreach ($strings as $string)
047 {
048 if ($string[$i] !== $c)
049 {
050 break 2;
051 }
052 }
053 $len = ++$i;
054 }
055
056 return $len;
057 }
058
059 /**
060 * Get the text content of the firstChild/lastChild of each branch if they are all text nodes
061 *
062 * @param string $childType Either firstChild or lastChild
063 * @return string[] List of strings or an empty array
064 */
065 protected function getTextContent($childType)
066 {
067 $strings = [];
068 foreach ($this->getBranches() as $branch)
069 {
070 if (!($branch->$childType instanceof DOMText))
071 {
072 return [];
073 }
074 $strings[] = $branch->$childType->textContent;
075 }
076
077 return $strings;
078 }
079
080 /**
081 * {@inheritdoc}
082 */
083 protected function optimizeChoose()
084 {
085 if (!$this->hasOtherwise())
086 {
087 return;
088 }
089
090 $this->optimizeLeadingText();
091 $this->optimizeTrailingText();
092 }
093
094 /**
095 * Move common leading text outside of current choose
096 *
097 * @return void
098 */
099 protected function optimizeLeadingText()
100 {
101 $strings = $this->getTextContent('firstChild');
102 if (empty($strings))
103 {
104 return;
105 }
106
107 $len = $this->getPrefixLength($strings);
108 if ($len)
109 {
110 $this->adjustTextNodes('firstChild', $len);
111 $this->choose->parentNode->insertBefore(
112 $this->createText(substr($strings[0], 0, $len)),
113 $this->choose
114 );
115 }
116 }
117
118 /**
119 * Move common trailing text outside of current choose
120 *
121 * @return void
122 */
123 protected function optimizeTrailingText()
124 {
125 $strings = $this->getTextContent('lastChild');
126 if (empty($strings))
127 {
128 return;
129 }
130
131 // Flip the strings before computing the prefix length to get the suffix length
132 $len = $this->getPrefixLength(array_map('strrev', $strings));
133 if ($len)
134 {
135 $this->adjustTextNodes('lastChild', 0, -$len);
136 $this->choose->parentNode->insertBefore(
137 $this->createText(substr($strings[0], -$len)),
138 $this->choose->nextSibling
139 );
140 }
141 }
142 }