laipower/wp-content/plugins/w3-total-cache/UserExperience_DeferScripts_Mutator.php

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<?php
/**
* File: UserExperience_DeferScripts_Mutator.php
*
* JS feature mutator for buffer processing.
*
* @since 2.4.2
*
* @package W3TC
*/
namespace W3TC;
/**
* UserExperience DeferScripts Mutator.
*
* @since 2.4.2
*/
class UserExperience_DeferScripts_Mutator {
/**
* Config.
*
* @var object
*/
private $config;
/**
* Modified flag.
*
* @var boolean
*/
private $modified = false;
/**
* Array of includes.
*
* @var array
*/
private $includes = array();
/**
* User Experience DeferScripts Mutator constructor.
*
* @since 2.4.2
*
* @param object $config Config object.
*
* @return void
*/
public function __construct( $config ) {
$this->config = $config;
}
/**
* Runs User Experience DeferScripts Mutator.
*
* @since 2.4.2
*
* @param string $buffer Buffer string containing browser output.
*
* @return string
*/
public function run( $buffer ) {
$r = apply_filters(
'w3tc_deferscripts_mutator_before',
array(
'buffer' => $buffer,
'modified' => $this->modified,
)
);
$buffer = $r['buffer'];
$this->modified = $r['modified'];
$this->includes = $this->config->get_array(
array(
'user-experience-defer-scripts',
'includes',
)
);
$buffer = preg_replace_callback(
'~<script\s[^>]+>~is',
array(
$this,
'tag_script',
),
$buffer
);
return $buffer;
}
/**
* Get modified status flag.
*
* @since 2.4.2
*
* @return boolean
*/
public function content_modified() {
return $this->modified;
}
/**
* Modifies script tag for script matched to be deferred.
*
* @since 2.4.2
*
* @param array $matches array of matched JS entries.
*
* @return string
*/
public function tag_script( $matches ) {
$content = $matches[0];
if ( $this->is_content_included( $content ) ) {
$count = 0;
$content = preg_replace(
'~(\s)src=~is',
'$1data-lazy="w3tc" data-src=',
$content,
-1,
$count
);
if ( $count > 0 ) {
$this->modified = true;
}
}
return $content;
}
/**
* Checks if content has already been deferred.
*
* @since 2.4.2
*
* @param string $content script tag string.
*
* @return boolean
*/
private function is_content_included( $content ) {
foreach ( $this->includes as $w ) {
if ( ! empty( $w ) ) {
if ( strpos( $content, $w ) !== false ) {
return true;
}
}
}
return false;
}
/**
* Filters out scripts so Minify doesn't touch deferred scripts.
*
* @since 2.4.2
*
* @param array $script_tags array of script tags.
*
* @return array
*/
public function w3tc_minify_js_script_tags( $script_tags ) {
return array_values(
array_filter(
$script_tags,
function( $i ) {
return ! preg_match( '~\sdata-lazy="w3tc"\s~', $i );
}
)
);
}
}