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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2016 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\Renderers; |
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use XSLTProcessor; |
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use s9e\TextFormatter\Renderer; |
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class XSLT extends Renderer |
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{ |
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/** |
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* @var XSLTProcessor The lazy-loaded XSLTProcessor instance used by this renderer |
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*/ |
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protected $proc; |
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/** |
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* @var bool Whether parameters need to be reloaded |
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*/ |
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protected $reloadParams = false; |
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/** |
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* @var string The stylesheet used by this renderer |
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*/ |
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protected $stylesheet; |
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/** |
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* Constructor |
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* |
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* @param string $stylesheet The stylesheet used to render intermediate representations |
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*/ |
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public function __construct($stylesheet) |
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{ |
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$this->stylesheet = $stylesheet; |
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// Capture the parameters' values from the stylesheet |
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preg_match_all('#<xsl:param name="([^"]+)"(?>/>|>([^<]+))#', $stylesheet, $matches); |
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foreach ($matches[1] as $k => $paramName) |
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{ |
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$this->params[$paramName] = (isset($matches[2][$k])) |
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? htmlspecialchars_decode($matches[2][$k]) |
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: ''; |
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} |
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} |
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/** |
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* Serializer |
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* |
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* @return string[] List of properties to serialize |
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*/ |
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public function __sleep() |
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{ |
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$props = get_object_vars($this); |
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unset($props['proc']); |
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if (empty($props['reloadParams'])) |
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{ |
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unset($props['reloadParams']); |
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} |
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return array_keys($props); |
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} |
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/** |
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* Unserialize helper |
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* |
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* Will reload parameters if they were changed between generation and serialization |
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* |
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* @return void |
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*/ |
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public function __wakeup() |
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{ |
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if (!empty($this->reloadParams)) |
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{ |
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$this->setParameters($this->params); |
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$this->reloadParams = false; |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setParameter($paramName, $paramValue) |
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{ |
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/** |
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* @link https://bugs.php.net/64137 |
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*/ |
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if (strpos($paramValue, '"') !== false && strpos($paramValue, "'") !== false) |
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{ |
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$paramValue = str_replace('"', "\xEF\xBC\x82", $paramValue); |
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} |
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else |
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{ |
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$paramValue = (string) $paramValue; |
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} |
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if (!isset($this->params[$paramName]) || $this->params[$paramName] !== $paramValue) |
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{ |
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$this->load(); |
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$this->proc->setParameter('', $paramName, $paramValue); |
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$this->params[$paramName] = $paramValue; |
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$this->reloadParams = true; |
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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 renderRichText($xml) |
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{ |
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// Load the intermediate representation |
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$dom = $this->loadXML($xml); |
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// Load the stylesheet |
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$this->load(); |
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// Perform the transformation and cast it as a string because it may return NULL if the |
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// transformation didn't output anything |
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$output = (string) $this->proc->transformToXml($dom); |
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// XSLTProcessor does not correctly identify <embed> as a void element. We fix it by |
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// removing </embed> end tags |
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$output = str_replace('</embed>', '', $output); |
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// Remove the \n that XSL adds at the end of the output, if applicable |
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if (substr($output, -1) === "\n") |
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{ |
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$output = substr($output, 0, -1); |
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} |
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// Force HTML attributes to use double quotes to be consistent with the PHP renderer |
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if (strpos($output, "='") !== false) |
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{ |
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$output = $this->normalizeAttributes($output); |
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} |
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return $output; |
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} |
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/** |
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* Create an XSLTProcessor and load the stylesheet |
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* |
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* @return void |
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*/ |
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protected function load() |
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{ |
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if (!isset($this->proc)) |
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{ |
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$xsl = $this->loadXML($this->stylesheet); |
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$this->proc = new XSLTProcessor; |
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$this->proc->importStylesheet($xsl); |
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} |
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} |
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/** |
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* Normalize given attribute's value to use double quotes |
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* |
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* @param string[] $m |
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* @return string |
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*/ |
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protected function normalizeAttribute(array $m) |
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{ |
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if ($m[0][0] === '"') |
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{ |
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return $m[0]; |
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} |
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return '"' . str_replace('"', '"', substr($m[0], 1, -1)) . '"'; |
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} |
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/** |
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* Normalize all attributes in given HTML to use double quotes |
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* |
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* @param string $html |
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* @return string |
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*/ |
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protected function normalizeAttributes($html) |
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{ |
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return preg_replace_callback('(<\\S++ [^>]++>)', [$this, 'normalizeElement'], $html); |
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} |
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/** |
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* Normalize attributes in given element to use double quotes |
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* |
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* @param string[] $m |
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* @return string |
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*/ |
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protected function normalizeElement(array $m) |
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{ |
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if (strpos($m[0], "='") === false) |
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{ |
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return $m[0]; |
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} |
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return preg_replace_callback('((?:"[^"]*"|\'[^\']*\'))S', [$this, 'normalizeAttribute'], $m[0]); |
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} |
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} |