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Minify_AutoJs.php
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Minify_AutoJs.php
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<?php
namespace W3TC;
class Minify_AutoJs {
/**
* 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
*/
private $files_to_minify;
/**
* Current group type
*
* @var string
*/
private $group_type = 'head';
private $debug = false;
/**
* Constructor
*
* @param unknown $config
* @param unknown $buffer
* @param unknown $minify_helpers
*/
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' )
);
}
/**
* Does auto-minification
*
* @return string buffer of minified content
*/
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()
)
);
for ( $n = 0; $n < count( $script_tags ); $n++ ) {
$this->process_script_tag( $script_tags[$n], $n );
}
$this->flush_collected( 'sync', '' );
$this->flush_collected( 'async', '' );
$this->flush_collected( 'defer', '' );
return $this->buffer;
}
/**
* Returns list of minified scripts
*
* @return array
*/
public function get_debug_minified_urls() {
return $this->debug_minified_urls;
}
/**
* Processes script tag
*
* @param unknown $script_tag
* @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 ( $tag_pos === false ) {
// 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 ( $step1_result == 'url' )
$file = $script_src;
$step1 = !empty( $step1_result );
$step2 = !in_array( $file, $this->ignore_js_files );
$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 ||
$this->group_type == 'body' ) {
$this->files_to_minify[$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 ( $this->config->get_string( 'minify.js.method' ) == 'minify' )
$this->flush_collected( $sync_type, '' );
}
/**
* Minifies collected scripts
*/
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_type == 'sync' ) {
$embed_type = $this->embed_type[$this->group_type];
} elseif ( $sync_type == 'async' ) {
$embed_type = 'nb-async';
} elseif ( $sync_type == 'defer' ) {
$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()
);
}
}