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<?php
use WP_Rocket\deprecated\DeprecatedClassTrait;
/**
* Class Minify_HTML
* @package Minify
*/
/**
* 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 <[email protected]>
*/
class Minify_HTML
{
use DeprecatedClassTrait;
/**
* @var boolean
*/
protected $_jsCleanComments = true;
/**
* "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())
{
self::deprecated_class( '3.7' );
$this->_html = str_replace("\r\n", "\n", trim($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'];
}
}
/**
* 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
// preg_replace_callback - on errors the return is NULL
// On big scripts PREG_BACKTRACK_LIMIT_ERROR is reached and causes the empty page
$pregJs = preg_replace_callback(
'/(\\s*)<script(\\b[^>]*?>)([\\s\\S]*?)<\\/script>(\\s*)/i'
,array($this, '_removeScriptCB')
,$this->_html);
if ( isset($pregJs) && ! empty( $pregJs ) ) {
$this->_html = $pregJs;
}
// replace STYLEs (and minify) with placeholders
// preg_replace_callback - on errors the return is NULL
// On big scripts PREG_BACKTRACK_LIMIT_ERROR is reached and causes the empty page
$pregCSS = preg_replace_callback(
'/\\s*<style(\\b[^>]*>)([\\s\\S]*?)<\\/style>\\s*/i'
,array($this, '_removeStyleCB')
,$this->_html);
if ( isset( $pregCSS ) && ! empty( $pregCSS ) ) {
$this->_html = $pregCSS;
}
// 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.
// Fixed attribute values which span on multiple lines. Causes double spaces " "
$this->_html = preg_replace('/^\s+|\s+$/m', ' ', $this->_html);
// Fixed double spaces. Replaced with a single space
$this->_html = preg_replace('/\s+/', ' ', $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
$this->_html = preg_replace_callback(
'/>([^<]+)</'
,array($this, '_outsideTagCB')
,$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 $this->_html;
}
protected function _commentCB($m)
{
return
(
false !== strpos($m[1], 'fwp-loop')
||
false !== strpos($m[1], 'ngg_resource_manager_marker')
||
0 === strpos($m[1], '[')
||
false !== strpos($m[1], '<![')
||
0 === strpos($m[1], 'esi')
||
0 === strpos($m[1], 'noindex')
||
0 === strpos($m[1], '/noindex')
||
0 === strpos($m[1], 'start_content')
||
0 === strpos($m[1], 'end_content')
||
0 === strpos($m[1], '{{WP_ROCKET_CONDITIONAL}}')
)
? $m[0]
: '';
}
protected function _reservePlace($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 $_jsMinifier = null;
protected function _outsideTagCB($m)
{
return '>' . preg_replace('/^\\s+|\\s+$/', ' ', $m[1]) . '<';
}
protected function _removePreCB($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
$css = preg_replace('/(?:^\\s*<!--|-->\\s*$)/u', '', $css);
// remove CDATA section markers
$data = $this->_removeCdata($css);
// minify
$minifier = $this->_cssMinifier
? $this->_cssMinifier
: 'trim';
$css = call_user_func($minifier, $data['content']);
return $this->_reservePlace( $data['cdata']
? "{$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) {
$js = preg_replace('/(?:^\\s*<!--\\s*|\\s*(?:\\/\\/)?\\s*-->\\s*$)/u', '', $js);
}
// remove CDATA section markers
$data = $this->_removeCdata($js);
// minify
$minifier = $this->_jsMinifier
? $this->_jsMinifier
: 'trim';
$js = call_user_func($minifier, $data['content']);
return $this->_reservePlace($data['cdata']
? "{$ws1}{$openScript}/* <![CDATA[ */ {$js} /* ]]> */</script>{$ws2}"
: "{$ws1}{$openScript}{$js}</script>{$ws2}"
);
}
protected function _removeCdata($str)
{
$data = array();
if ( false !== strpos( $str, '<![CDATA[' ) ) {
$data['content'] = str_replace( array( '/* <![CDATA[ */', '/* ]]> */' ), '', $str );
$data['cdata'] = true;
} else {
$data['content'] = $str;
$data['cdata'] = false;
}
return $data;
}
}