<?php

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// phpcs:ignoreFile

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/**

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* Compress HTML

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*

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* This is a heavy regex-based removal of whitespace, unnecessary comments and

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* tokens. IE conditional comments are preserved. There are also options to have

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* STYLE and SCRIPT blocks compressed by callback functions.

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*

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* A test suite is available.

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*

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* @package Minify

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* @author Stephen Clay <steve@mrclay.org>

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*/

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namespace LiteSpeed\Lib;

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defined( 'WPINC' ) || exit;

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class HTML_MIN {

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/**

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* @var string

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*/

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protected $_html = '';

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/**

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* @var boolean

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*/

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protected $_jsCleanComments = true;

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protected $_skipComments = array();

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/**

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* "Minify" an HTML page

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*

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* @param string $html

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*

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* @param array $options

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*

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* 'cssMinifier' : (optional) callback function to process content of STYLE

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* elements.

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*

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* 'jsMinifier' : (optional) callback function to process content of SCRIPT

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* elements. Note: the type attribute is ignored.

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*

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* 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If

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* unset, minify will sniff for an XHTML doctype.

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*

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* @return string

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*/

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public static function minify( $html, $options = array() ) {

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$min = new self( $html, $options );

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return $min->process();

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}

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/**

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* Create a minifier object

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*

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* @param string $html

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*

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* @param array $options

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*

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* 'cssMinifier' : (optional) callback function to process content of STYLE

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* elements.

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*

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* 'jsMinifier' : (optional) callback function to process content of SCRIPT

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* elements. Note: the type attribute is ignored.

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*

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* 'jsCleanComments' : (optional) whether to remove HTML comments beginning and end of script block

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*

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* 'xhtml' : (optional boolean) should content be treated as XHTML1.0? If

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* unset, minify will sniff for an XHTML doctype.

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*/

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public function __construct( $html, $options = array() ) {

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$this->_html = str_replace( "\r\n", "\n", trim( $html ) );

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if ( isset( $options['xhtml'] ) ) {

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$this->_isXhtml = (bool) $options['xhtml'];

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}

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if ( isset( $options['cssMinifier'] ) ) {

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$this->_cssMinifier = $options['cssMinifier'];

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}

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if ( isset( $options['jsMinifier'] ) ) {

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$this->_jsMinifier = $options['jsMinifier'];

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}

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if ( isset( $options['jsCleanComments'] ) ) {

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$this->_jsCleanComments = (bool) $options['jsCleanComments'];

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}

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if ( isset( $options['skipComments'] ) ) {

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$this->_skipComments = $options['skipComments'];

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}

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}

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/**

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* Minify the markeup given in the constructor

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*

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* @return string

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*/

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public function process() {

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if ( $this->_isXhtml === null ) {

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$this->_isXhtml = ( false !== strpos( $this->_html, '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML' ) );

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}

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

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$this->_placeholders = array();

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// replace SCRIPTs (and minify) with placeholders

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$this->_html = preg_replace_callback(

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'/(\\s*)<script(\\b[^>]*?>)([\\s\\S]*?)<\\/script>(\\s*)/i',

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array( $this, '_removeScriptCB' ),

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$this->_html

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);

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// replace STYLEs (and minify) with placeholders

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$this->_html = preg_replace_callback(

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'/\\s*<style(\\b[^>]*>)([\\s\\S]*?)<\\/style>\\s*/i',

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array( $this, '_removeStyleCB' ),

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$this->_html

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);

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// remove HTML comments (not containing IE conditional comments).

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$this->_html = preg_replace_callback(

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'/<!--([\\s\\S]*?)-->/',

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array( $this, '_commentCB' ),

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$this->_html

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);

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// replace PREs with placeholders

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$this->_html = preg_replace_callback(

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'/\\s*<pre(\\b[^>]*?>[\\s\\S]*?<\\/pre>)\\s*/i',

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array( $this, '_removePreCB' ),

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$this->_html

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);

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// replace TEXTAREAs with placeholders

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$this->_html = preg_replace_callback(

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'/\\s*<textarea(\\b[^>]*?>[\\s\\S]*?<\\/textarea>)\\s*/i',

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array( $this, '_removeTextareaCB' ),

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$this->_html

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);

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// trim each line.

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// @todo take into account attribute values that span multiple lines.

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$this->_html = preg_replace( '/^\\s+|\\s+$/m', '', $this->_html );

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// remove ws around block/undisplayed elements

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$this->_html = preg_replace(

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'/\\s+(<\\/?(?:area|article|aside|base(?:font)?|blockquote|body'

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. '|canvas|caption|center|col(?:group)?|dd|dir|div|dl|dt|fieldset|figcaption|figure|footer|form'

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. '|frame(?:set)?|h[1-6]|head|header|hgroup|hr|html|legend|li|link|main|map|menu|meta|nav'

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. '|ol|opt(?:group|ion)|output|p|param|section|t(?:able|body|head|d|h||r|foot|itle)'

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. '|ul|video)\\b[^>]*>)/i',

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'$1',

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$this->_html

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);

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// remove ws outside of all elements

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$this->_html = preg_replace(

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'/>(\\s(?:\\s*))?([^<]+)(\\s(?:\s*))?</',

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'>$1$2$3<',

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$this->_html

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);

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// use newlines before 1st attribute in open tags (to limit line lengths)

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// $this->_html = preg_replace('/(<[a-z\\-]+)\\s+([^>]+>)/i', "$1\n$2", $this->_html);

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// fill placeholders

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$this->_html = str_replace(

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array_keys( $this->_placeholders ),

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array_values( $this->_placeholders ),

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$this->_html

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);

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// issue 229: multi-pass to catch scripts that didn't get replaced in textareas

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$this->_html = str_replace(

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array_keys( $this->_placeholders ),

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array_values( $this->_placeholders ),

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$this->_html

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);

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return $this->_html;

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}

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/**

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* 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

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*/

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protected function _commentCB( $m ) {

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// If is IE conditional comment return it.

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if ( 0 === strpos( $m[1], '[' ) || false !== strpos( $m[1], '<![' ) ) {

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return $m[0];

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}

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// Check if comment text is present in Page Optimization -> HTML Settings -> HTML Keep comments

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if ( count( $this->_skipComments ) > 0 ) {

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foreach ( $this->_skipComments as $comment ) {

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if ( $comment && strpos( $m[1], $comment ) !== false ) {

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return $m[0];

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}

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}

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}

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// Comment can be removed.

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return '';

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}

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protected function _reservePlace( $content ) {

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$placeholder = '%' . $this->_replacementHash . count( $this->_placeholders ) . '%';

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$this->_placeholders[ $placeholder ] = $content;

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return $placeholder;

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}

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protected $_isXhtml = null;

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protected $_replacementHash = null;

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protected $_placeholders = array();

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protected $_cssMinifier = null;

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protected $_jsMinifier = null;

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protected function _removePreCB( $m ) {

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

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}

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protected function _removeTextareaCB( $m ) {

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

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}

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protected function _removeStyleCB( $m ) {

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$openStyle = "<style{$m[1]}";

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$css = $m[2];

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// remove HTML comments

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$css = preg_replace( '/(?:^\\s*<!--|-->\\s*$)/', '', $css );

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// remove CDATA section markers

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$css = $this->_removeCdata( $css );

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// minify

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$minifier = $this->_cssMinifier

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? $this->_cssMinifier

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: 'trim';

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$css = call_user_func( $minifier, $css );

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return $this->_reservePlace(

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$this->_needsCdata( $css )

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? "{$openStyle}/*<![CDATA[*/{$css}/*]]>*/</style>"

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: "{$openStyle}{$css}</style>"

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);

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}

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protected function _removeScriptCB( $m ) {

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$openScript = "<script{$m[2]}";

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$js = $m[3];

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// whitespace surrounding? preserve at least one space

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$ws1 = ( $m[1] === '' ) ? '' : ' ';

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$ws2 = ( $m[4] === '' ) ? '' : ' ';

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// remove HTML comments (and ending "//" if present)

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if ( $this->_jsCleanComments ) {

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$js = preg_replace( '/(?:^\\s*<!--\\s*|\\s*(?:\\/\\/)?\\s*-->\\s*$)/', '', $js );

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}

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// remove CDATA section markers

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$js = $this->_removeCdata( $js );

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// minify

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/**

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* Added 2nd param by LiteSpeed

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*

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* @since 2.2.3

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*/

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if ( $this->_jsMinifier ) {

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$js = call_user_func( $this->_jsMinifier, $js, trim( $m[2] ) );

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} else {

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$js = trim( $js );

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}

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return $this->_reservePlace(

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$this->_needsCdata( $js )

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? "{$ws1}{$openScript}/*<![CDATA[*/{$js}/*]]>*/</script>{$ws2}"

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: "{$ws1}{$openScript}{$js}</script>{$ws2}"

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);

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}

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protected function _removeCdata( $str ) {

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return ( false !== strpos( $str, '<![CDATA[' ) )

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? str_replace( array( '<![CDATA[', ']]>' ), '', $str )

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: $str;

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}

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protected function _needsCdata( $str ) {

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

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}

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}

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