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AbstractXSLSupportCheck.php
001 <?php declare(strict_types=1);
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\TemplateChecks;
009
010 use DOMElement;
011 use DOMXPath;
012 use RuntimeException;
013 use s9e\TextFormatter\Configurator\Helpers\AVTHelper;
014 use s9e\TextFormatter\Configurator\Items\Tag;
015 use s9e\TextFormatter\Configurator\TemplateCheck;
016
017 abstract class AbstractXSLSupportCheck extends TemplateCheck
018 {
019 /**
020 * @var string[] List of supported XSL elements (local name only)
021 */
022 protected $supportedElements = [];
023
024 /**
025 * @var string[] List of supported XPath functions
026 */
027 protected $supportedFunctions = [];
028
029 /**
030 * @var string[] List of supported XPath operators
031 */
032 protected $supportedOperators = ['and', 'div', 'mod', 'or'];
033
034 /**
035 * Check for elements not supported by the PHP renderer
036 *
037 * @param DOMElement $template <xsl:template/> node
038 * @param Tag $tag Tag this template belongs to
039 */
040 public function check(DOMElement $template, Tag $tag): void
041 {
042 $this->checkXslElements($template);
043 $this->checkXPathExpressions($template);
044 }
045
046 /**
047 * Check given XPath expression
048 */
049 protected function checkXPathExpression(string $expr): void
050 {
051 preg_match_all('("[^"]*+"|\'[^\']*+\'|((?:[a-z]++-)*+[a-z]++)(?=\\s*\\())', $expr, $m);
052 foreach (array_filter($m[1]) as $funcName)
053 {
054 if (!in_array($funcName, $this->supportedFunctions, true)
055 && !in_array($funcName, $this->supportedOperators, true))
056 {
057 throw new RuntimeException('XPath function ' . $funcName . '() is not supported');
058 }
059 }
060 }
061
062 /**
063 * Check all XPath expressions in given template
064 */
065 protected function checkXPathExpressions(DOMElement $template): void
066 {
067 foreach ($this->getXPathExpressions($template) as $expr)
068 {
069 $this->checkXPathExpression($expr);
070 }
071 }
072
073 /**
074 * Check all XSL elements in given template
075 */
076 protected function checkXslElements(DOMElement $template): void
077 {
078 $xpath = new DOMXPath($template->ownerDocument);
079 $nodes = $xpath->query('/xsl:template//xsl:*');
080 foreach ($nodes as $node)
081 {
082 if (!in_array($node->localName, $this->supportedElements, true))
083 {
084 throw new RuntimeException('xsl:' . $node->localName . ' elements are not supported');
085 }
086
087 $methodName = 'checkXsl' . str_replace(' ', '', ucwords(str_replace('-', ' ', $node->localName))) . 'Element';
088 if (method_exists($this, $methodName))
089 {
090 $this->$methodName($node);
091 }
092 }
093 }
094
095 /**
096 * Return all XPath expressions in given template
097 */
098 protected function getXPathExpressions(DOMElement $template): array
099 {
100 $exprs = [];
101 $xpath = new DOMXPath($template->ownerDocument);
102
103 $query = '//xsl:*/@name | //*[namespace-uri() != "' . self::XMLNS_XSL . '"]/@*[contains(., "{")]';
104 foreach ($xpath->query($query) as $attribute)
105 {
106 foreach (AVTHelper::parse($attribute->value) as [$type, $content])
107 {
108 if ($type === 'expression')
109 {
110 $exprs[] = $content;
111 }
112 }
113 }
114
115 $query = '//xsl:*/@select | //xsl:*/@test';
116 foreach ($xpath->query($query) as $attribute)
117 {
118 $exprs[] = $attribute->value;
119 }
120
121 return $exprs;
122 }
123 }