/**
* 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
*/
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, '_replacementHash = 'MINIFYHTML' . md5($_SERVER['REQUEST_TIME']);
$this->_placeholders = array();
// replace SCRIPTs (and minify) with placeholders
$this->_html = preg_replace_callback(
'/(\\s*)]*?>)([\\s\\S]*?)<\\/script>(\\s*)/i'
,array($this, '_removeScriptCB')
,$this->_html);
// replace STYLEs (and minify) with placeholders
$this->_html = preg_replace_callback(
'/\\s*]*>)([\\s\\S]*?)<\\/style>\\s*/i'
,array($this, '_removeStyleCB')
,$this->_html);
// remove HTML comments (not containing IE conditional comments).
$this->_html = preg_replace_callback(
'//'
,array($this, '_commentCB')
,$this->_html);
// replace PREs with placeholders
$this->_html = preg_replace_callback('/\\s*]*?>[\\s\\S]*?<\\/pre>)\\s*/i'
,array($this, '_removePreCB')
,$this->_html);
// replace TEXTAREAs with placeholders
$this->_html = preg_replace_callback(
'/\\s*]*?>[\\s\\S]*?<\\/textarea>)\\s*/i'
,array($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], ' 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 $this->_reservePlace("_reservePlace("\\s*$)/', '', $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}/**/"
: "{$openStyle}{$css}"
);
}
protected function _removeScriptCB($m)
{
$openScript = "_jsCleanComments) {
$js = preg_replace('/(?:^\\s*\\s*$)/', '', $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}{$openScript}/**/{$ws2}"
: "{$ws1}{$openScript}{$js}{$ws2}"
);
}
protected function _removeCdata($str)
{
return (false !== strpos($str, ''), '', $str)
: $str;
}
protected function _needsCdata($str)
{
return ($this->_isXhtml && preg_match('/(?:[<&]|\\-\\-|\\]\\]>)/', $str));
}
}
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