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Current File : /home/wavevlvu/diixadigital.com/wp-content/plugins/litespeed-cache/lib//html-min.cls.php
<?php
/**
 * Compress HTML
 *
 * This is a heavy regex-based removal of whitespace, unnecessary comments and
 * tokens. IE conditional comments are preserved. There are also options to have
 * STYLE and SCRIPT blocks compressed by callback functions.
 *
 * A test suite is available.
 *
 * @package Minify
 * @author Stephen Clay <steve@mrclay.org>
 */
namespace LiteSpeed\Lib ;

defined( 'WPINC' ) || exit ;

class HTML_MIN
{
	/**
	 * @var string
	 */
	protected $_html = '';

	/**
	 * @var boolean
	 */
	protected $_jsCleanComments = true;
	protected $_skipComments = array();

	/**
	 * "Minify" an HTML page
	 *
	 * @param string $html
	 *
	 * @param array $options
	 *
	 * 'cssMinifier' : (optional) callback function to process content of STYLE
	 * elements.
	 *
	 * 'jsMinifier' : (optional) callback function to process content of SCRIPT
	 * elements. Note: the type attribute is ignored.
	 *
	 * 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If
	 * unset, minify will sniff for an XHTML doctype.
	 *
	 * @return string
	 */
	public static function minify($html, $options = array())
	{
		$min = new self($html, $options);

		return $min->process();
	}

	/**
	 * Create a minifier object
	 *
	 * @param string $html
	 *
	 * @param array $options
	 *
	 * 'cssMinifier' : (optional) callback function to process content of STYLE
	 * elements.
	 *
	 * 'jsMinifier' : (optional) callback function to process content of SCRIPT
	 * elements. Note: the type attribute is ignored.
	 *
	 * 'jsCleanComments' : (optional) whether to remove HTML comments beginning and end of script block
	 *
	 * 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If
	 * unset, minify will sniff for an XHTML doctype.
	 */
	public function __construct($html, $options = array())
	{
		$this->_html = str_replace("\r\n", "\n", trim($html));
		if (isset($options['xhtml'])) {
			$this->_isXhtml = (bool)$options['xhtml'];
		}
		if (isset($options['cssMinifier'])) {
			$this->_cssMinifier = $options['cssMinifier'];
		}
		if (isset($options['jsMinifier'])) {
			$this->_jsMinifier = $options['jsMinifier'];
		}
		if (isset($options['jsCleanComments'])) {
			$this->_jsCleanComments = (bool)$options['jsCleanComments'];
		}
		if (isset($options['skipComments'])) {
			$this->_skipComments = $options['skipComments'];
		}
	}

	/**
	 * Minify the markeup given in the constructor
	 *
	 * @return string
	 */
	public function process()
	{
		if ($this->_isXhtml === null) {
			$this->_isXhtml = (false !== strpos($this->_html, '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML'));
		}

		$this->_replacementHash = 'MINIFYHTML' . md5($_SERVER['REQUEST_TIME']);
		$this->_placeholders = array();

		// replace SCRIPTs (and minify) with placeholders
		$this->_html = preg_replace_callback(
			'/(\\s*)<script(\\b[^>]*?>)([\\s\\S]*?)<\\/script>(\\s*)/i'
			,array($this, '_removeScriptCB')
			,$this->_html);

		// replace STYLEs (and minify) with placeholders
		$this->_html = preg_replace_callback(
			'/\\s*<style(\\b[^>]*>)([\\s\\S]*?)<\\/style>\\s*/i'
			,array($this, '_removeStyleCB')
			,$this->_html);

		// remove HTML comments (not containing IE conditional comments).
		$this->_html = preg_replace_callback(
			'/<!--([\\s\\S]*?)-->/'
			,array($this, '_commentCB')
			,$this->_html);

		// replace PREs with placeholders
		$this->_html = preg_replace_callback('/\\s*<pre(\\b[^>]*?>[\\s\\S]*?<\\/pre>)\\s*/i'
			,array($this, '_removePreCB')
			,$this->_html);

		// replace TEXTAREAs with placeholders
		$this->_html = preg_replace_callback(
			'/\\s*<textarea(\\b[^>]*?>[\\s\\S]*?<\\/textarea>)\\s*/i'
			,array($this, '_removeTextareaCB')
			,$this->_html);

		// trim each line.
		// @todo take into account attribute values that span multiple lines.
		$this->_html = preg_replace('/^\\s+|\\s+$/m', '', $this->_html);

		// remove ws around block/undisplayed elements
		$this->_html = preg_replace('/\\s+(<\\/?(?:area|article|aside|base(?:font)?|blockquote|body'
			.'|canvas|caption|center|col(?:group)?|dd|dir|div|dl|dt|fieldset|figcaption|figure|footer|form'
			.'|frame(?:set)?|h[1-6]|head|header|hgroup|hr|html|legend|li|link|main|map|menu|meta|nav'
			.'|ol|opt(?:group|ion)|output|p|param|section|t(?:able|body|head|d|h||r|foot|itle)'
			.'|ul|video)\\b[^>]*>)/i', '$1', $this->_html);

		// remove ws outside of all elements
		$this->_html = preg_replace(
			'/>(\\s(?:\\s*))?([^<]+)(\\s(?:\s*))?</'
			,'>$1$2$3<'
			,$this->_html);

		// use newlines before 1st attribute in open tags (to limit line lengths)
		// $this->_html = preg_replace('/(<[a-z\\-]+)\\s+([^>]+>)/i', "$1\n$2", $this->_html);

		// fill placeholders
		$this->_html = str_replace(
			array_keys($this->_placeholders)
			,array_values($this->_placeholders)
			,$this->_html
		);
		// issue 229: multi-pass to catch scripts that didn't get replaced in textareas
		$this->_html = str_replace(
			array_keys($this->_placeholders)
			,array_values($this->_placeholders)
			,$this->_html
		);

		return $this->_html;
	}

	/**
	 * From LSCWP 6.2: Changed the function to test for special comments that will be skipped. See: https://github.com/litespeedtech/lscache_wp/pull/622
	 */
	protected function _commentCB($m)
	{
		// If is IE conditional comment return it.
		if(0 === strpos($m[1], '[') || false !== strpos($m[1], '<![')) return $m[0];

		// Check if comment text is present in Page Optimization -> HTML Settings -> HTML Keep comments
		if(count($this->_skipComments) > 0){
			foreach ($this->_skipComments as $comment) {
				if ($comment && strpos($m[1], $comment) !== false) {
					return $m[0];
				}
			}
		}

		// Comment can be removed.
		return '';
	}

	protected function _reservePlace($content)
	{
		$placeholder = '%' . $this->_replacementHash . count($this->_placeholders) . '%';
		$this->_placeholders[$placeholder] = $content;

		return $placeholder;
	}

	protected $_isXhtml = null;
	protected $_replacementHash = null;
	protected $_placeholders = array();
	protected $_cssMinifier = null;
	protected $_jsMinifier = null;

	protected function _removePreCB($m)
	{
		return $this->_reservePlace("<pre{$m[1]}");
	}

	protected function _removeTextareaCB($m)
	{
		return $this->_reservePlace("<textarea{$m[1]}");
	}

	protected function _removeStyleCB($m)
	{
		$openStyle = "<style{$m[1]}";
		$css = $m[2];
		// remove HTML comments
		$css = preg_replace('/(?:^\\s*<!--|-->\\s*$)/', '', $css);

		// remove CDATA section markers
		$css = $this->_removeCdata($css);

		// minify
		$minifier = $this->_cssMinifier
			? $this->_cssMinifier
			: 'trim';
		$css = call_user_func($minifier, $css);

		return $this->_reservePlace($this->_needsCdata($css)
			? "{$openStyle}/*<![CDATA[*/{$css}/*]]>*/</style>"
			: "{$openStyle}{$css}</style>"
		);
	}

	protected function _removeScriptCB($m)
	{
		$openScript = "<script{$m[2]}";
		$js = $m[3];

		// whitespace surrounding? preserve at least one space
		$ws1 = ($m[1] === '') ? '' : ' ';
		$ws2 = ($m[4] === '') ? '' : ' ';

		// remove HTML comments (and ending "//" if present)
		if ($this->_jsCleanComments) {
			$js = preg_replace('/(?:^\\s*<!--\\s*|\\s*(?:\\/\\/)?\\s*-->\\s*$)/', '', $js);
		}

		// remove CDATA section markers
		$js = $this->_removeCdata($js);

		// minify
		/**
		 * Added 2nd param by LiteSpeed
		 *
		 * @since  2.2.3
		 */
		if ( $this->_jsMinifier ) {
			$js = call_user_func( $this->_jsMinifier, $js, trim( $m[ 2 ] ) ) ;
		}
		else {
			$js = trim( $js ) ;
		}

		return $this->_reservePlace($this->_needsCdata($js)
			? "{$ws1}{$openScript}/*<![CDATA[*/{$js}/*]]>*/</script>{$ws2}"
			: "{$ws1}{$openScript}{$js}</script>{$ws2}"
		);
	}

	protected function _removeCdata($str)
	{
		return (false !== strpos($str, '<![CDATA['))
			? str_replace(array('<![CDATA[', ']]>'), '', $str)
			: $str;
	}

	protected function _needsCdata($str)
	{
		return ($this->_isXhtml && preg_match('/(?:[<&]|\\-\\-|\\]\\]>)/', $str));
	}
}

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