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<?php
/**
* File: Minify_AutoJs.php
*
* @package W3TC
*/
namespace W3TC;
/**
* Class Minify_AutoJs
*/
class Minify_AutoJs {
/**
* Config
*
* @var Config
*/
private $config;
/**
* Processed buffer
*
* @var string
*/
private $buffer;
/**
* JS files to ignore
*
* @var array
*/
private $ignore_js_files;
/**
* Embed type
*
* @var string
*/
private $embed_type;
/**
* Helper object to use
*
* @var _W3_MinifyHelpers
*/
private $minify_helpers;
/**
* Array of processed scripts
*
* @var array
*/
private $debug_minified_urls = array();
/**
* Current list of script files to minify
*
* @var array
*/
private $files_to_minify;
/**
* Current group type
*
* @var string
*/
private $group_type = 'head';
/**
* Debug flag
*
* @var bool
*/
private $debug = false;
/**
* Constructor for the Minify_AutoJs class.
*
* @param object $config Configuration object containing settings.
* @param string $buffer HTML buffer to process.
* @param object $minify_helpers Helper class for minification operations.
*
* @return void
*/
public function __construct( $config, $buffer, $minify_helpers ) {
$this->config = $config;
$this->debug = $config->get_boolean( 'minify.debug' );
$this->buffer = $buffer;
$this->minify_helpers = $minify_helpers;
// ignored files.
$this->ignore_js_files = $this->config->get_array( 'minify.reject.files.js' );
$this->ignore_js_files = array_map( array( '\W3TC\Util_Environment', 'normalize_file' ), $this->ignore_js_files );
// define embed type.
$this->embed_type = array(
'head' => $this->config->get_string( 'minify.js.header.embed_type' ),
'body' => $this->config->get_string( 'minify.js.body.embed_type' ),
);
}
/**
* Executes the minification process on the current buffer.
*
* @return string The modified HTML buffer after processing.
*/
public function execute() {
// find all script tags.
$buffer_nocomments = preg_replace( '~<!--.*?-->\s*~s', '', $this->buffer );
$matches = null;
// end of <head> means another group of scripts, cannt be combined.
if ( ! preg_match_all( '~(<script\s*[^>]*>.*?</script>|</head>)~is', $buffer_nocomments, $matches ) ) {
$matches = null;
}
if ( is_null( $matches ) ) {
return $this->buffer;
}
$script_tags = $matches[1];
$script_tags = apply_filters( 'w3tc_minify_js_script_tags', $script_tags );
// pass scripts.
$this->files_to_minify = array(
'sync' => array(
'embed_pos' => 0,
'files' => array(),
),
'async' => array(
'embed_pos' => 0,
'files' => array(),
),
'defer' => array(
'embed_pos' => 0,
'files' => array(),
),
);
$count = count( $script_tags );
for ( $n = 0; $n < $count; $n++ ) {
$this->process_script_tag( $script_tags[ $n ], $n );
}
$this->flush_collected( 'sync', '' );
$this->flush_collected( 'async', '' );
$this->flush_collected( 'defer', '' );
return $this->buffer;
}
/**
* Retrieves the list of debug URLs for the minified files.
*
* @return array List of URLs for debug purposes.
*/
public function get_debug_minified_urls() {
return $this->debug_minified_urls;
}
/**
* Processes a single script tag in the buffer.
*
* @param string $script_tag The HTML script tag to process.
* @param int $script_tag_number The index of the script tag being processed.
*
* @return void
*/
private function process_script_tag( $script_tag, $script_tag_number ) {
if ( $this->debug ) {
Minify_Core::log( 'processing tag ' . substr( $script_tag, 0, 150 ) );
}
$tag_pos = strpos( $this->buffer, $script_tag );
if ( false === $tag_pos ) {
// script is external but not found, skip processing it.
if ( $this->debug ) {
Minify_Core::log( 'script not found:' . $script_tag );
}
return;
}
$match = null;
if ( ! preg_match( '~<script\s+[^<>]*src=["\']?([^"\'> ]+)["\'> ]~is', $script_tag, $match ) ) {
$match = null;
}
if ( is_null( $match ) ) {
$data = array(
'script_tag_original' => $script_tag,
'script_tag_new' => $script_tag,
'script_tag_number' => $script_tag_number,
'script_tag_pos' => $tag_pos,
'should_replace' => false,
'buffer' => $this->buffer,
);
$data = apply_filters( 'w3tc_minify_js_do_local_script_minification', $data );
$this->buffer = $data['buffer'];
if ( $data['should_replace'] ) {
$this->buffer = substr_replace(
$this->buffer,
$data['script_tag_new'],
$tag_pos,
strlen( $script_tag )
);
}
// it's not external script, have to flush what we have before it.
if ( $this->debug ) {
Minify_Core::log( 'its not src=, flushing' );
}
$this->flush_collected( 'sync', $script_tag );
if ( preg_match( '~</head>~is', $script_tag, $match ) ) {
$this->group_type = 'body';
}
return;
}
$script_src = $match[1];
$script_src = Util_Environment::url_relative_to_full( $script_src );
$file = Util_Environment::url_to_docroot_filename( $script_src );
$step1_result = $this->minify_helpers->is_file_for_minification( $script_src, $file );
if ( 'url' === $step1_result ) {
$file = $script_src;
}
$step1 = ! empty( $step1_result );
$step2 = ! in_array( $file, $this->ignore_js_files, true );
$do_tag_minification = $step1 && $step2;
$do_tag_minification = apply_filters( 'w3tc_minify_js_do_tag_minification', $do_tag_minification, $script_tag, $file );
if ( ! $do_tag_minification ) {
if ( $this->debug ) {
Minify_Core::log(
'file ' . $file .
' didnt pass minification check:' .
' file_for_min: ' . ( $step1 ? 'true' : 'false' ) .
' ignore_js_files: ' . ( $step2 ? 'true' : 'false' )
);
}
$data = array(
'script_tag_original' => $script_tag,
'script_tag_new' => $script_tag,
'script_tag_number' => $script_tag_number,
'script_tag_pos' => $tag_pos,
'script_src' => $script_src,
'should_replace' => false,
'buffer' => $this->buffer,
);
$data = apply_filters( 'w3tc_minify_js_do_excluded_tag_script_minification', $data );
$this->buffer = $data['buffer'];
if ( $data['should_replace'] ) {
$this->buffer = substr_replace(
$this->buffer,
$data['script_tag_new'],
$tag_pos,
strlen( $script_tag )
);
}
$this->flush_collected( 'sync', $script_tag );
return;
}
$this->debug_minified_urls[] = $file;
$this->buffer = substr_replace(
$this->buffer,
'',
$tag_pos,
strlen( $script_tag )
);
$m = null;
if ( ! preg_match( '~\s+(async|defer)[> ]~is', $script_tag, $m ) ) {
$sync_type = 'sync';
// for head group - put minified file at the place of first script
// for body - put at the place of last script, to make as more DOM
// objects available as possible.
if (
count( $this->files_to_minify[ $sync_type ]['files'] ) <= 0 ||
'body' === $this->group_type
) {
$this->files_to_minify[ $sync_type ]['embed_pos'] = $tag_pos;
}
} else {
$sync_type = strtolower( $m[1] );
$this->files_to_minify[ $sync_type ]['embed_pos'] = $tag_pos;
}
$this->files_to_minify[ $sync_type ]['files'][] = $file;
if ( 'minify' === $this->config->get_string( 'minify.js.method' ) ) {
$this->flush_collected( $sync_type, '' );
}
}
/**
* Flushes the collected scripts for a given synchronization type.
*
* @param string $sync_type The synchronization type ('sync', 'async', 'defer').
* @param string $last_script_tag The last script tag in the group being processed.
*
* @return void
*/
private function flush_collected( $sync_type, $last_script_tag ) {
if ( count( $this->files_to_minify[ $sync_type ]['files'] ) <= 0 ) {
return;
}
$do_flush_collected = apply_filters( 'w3tc_minify_js_do_flush_collected', true, $last_script_tag, $this, $sync_type );
if ( ! $do_flush_collected ) {
return;
}
// build minified script tag.
if ( 'sync' === $sync_type ) {
$embed_type = $this->embed_type[ $this->group_type ];
} elseif ( 'async' === $sync_type ) {
$embed_type = 'nb-async';
} elseif ( 'defer' === $sync_type ) {
$embed_type = 'nb-defer';
}
$data = array(
'files_to_minify' => $this->files_to_minify[ $sync_type ]['files'],
'embed_pos' => $this->files_to_minify[ $sync_type ]['embed_pos'],
'embed_type' => $embed_type,
'buffer' => $this->buffer,
);
$data = apply_filters( 'w3tc_minify_js_step', $data );
$this->buffer = $data['buffer'];
if ( ! empty( $data['files_to_minify'] ) ) {
$url = $this->minify_helpers->get_minify_url_for_files( $data['files_to_minify'], 'js' );
$script = '';
if ( ! is_null( $url ) ) {
$script .= $this->minify_helpers->generate_script_tag( $url, $data['embed_type'] );
}
$data['script_to_embed_url'] = $url;
$data['script_to_embed_body'] = $script;
$data = apply_filters( 'w3tc_minify_js_step_script_to_embed', $data );
$this->buffer = $data['buffer'];
if ( $this->config->getf_boolean( 'minify.js.http2push' ) ) {
$this->minify_helpers->http2_header_add( $data['script_to_embed_url'], 'script' );
}
// replace.
$this->buffer = substr_replace(
$this->buffer,
$data['script_to_embed_body'],
$data['embed_pos'],
0
);
foreach ( $this->files_to_minify as $key => $i ) {
if ( $key !== $sync_type && $i['embed_pos'] >= $data['embed_pos'] ) {
$this->files_to_minify[ $key ]['embed_pos'] += strlen( $data['script_to_embed_body'] );
}
}
}
$this->files_to_minify[ $sync_type ] = array(
'embed_pos' => 0,
'files' => array(),
);
}
}