Jetpack_Asset_CDN::flush_concatenated_styles() - Code Metrics - Inspection of "Make serving of individual files configurable" - Automattic/jetpack - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — add/asset-cdn ( 3084e4...3a5f88 )

unknown

created 2017-11-17 03:02 UTC

Jetpack_Asset_CDN::flush_concatenated_styles() D

↳ Parent: Jetpack_Asset_CDN

Complexity

Conditions	10
Paths	21

Size

Total Lines	44
Code Lines	26

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	10
eloc	26
nc	21
nop	1
dl	0
loc	44
rs	4.8196
c	0
b	0
f	0

How to fix Complexity

<?php

/**
 * TODO

 * - asset inlining for smaller styles?
 * - critical CSS support?
 * - non-enqueued assets?
 */

class Jetpack_Asset_CDN {
	private static $__instance = null;

	private $cdn_server;
	private $concat_style_groups = array();
	private $concat_script_groups = array();
	private $inject_critical_css = false;
	private $include_external_assets = false;
	private $max_assets_per_tag = 1;


	/**
	 * Singleton implementation
	 *
	 * @return object
	 */
	public static function instance() {
		if ( ! is_a( self::$__instance, 'Jetpack_Asset_CDN' ) ) {
			self::$__instance = new Jetpack_Asset_CDN();
		}

		return self::$__instance;
	}

	public static function reset() {
		if ( null === self::$__instance ) {
			return;
		}

		// allow smaller CSS by only minifying assets on the page
		remove_filter( 'jetpack_implode_frontend_css', '__return_false' );

		// concatenate selected CSS and JS tags
		remove_filter( 'script_loader_tag', array( self::$__instance, 'register_concat_scripts' ), -100 );
		remove_filter( 'style_loader_tag', array( self::$__instance, 'register_concat_styles' ), -100 );

		// render buffered assets
		remove_action( 'wp_head', array( self::$__instance, 'render_concatenated_styles_head' ), PHP_INT_MAX );
		remove_action( 'wp_head', array( self::$__instance, 'render_concatenated_scripts_head' ), PHP_INT_MAX );
		remove_action( 'wp_footer', array( self::$__instance, 'render_concatenated_styles_footer' ), PHP_INT_MAX );
		remove_action( 'wp_footer', array( self::$__instance, 'render_concatenated_scripts_footer' ), PHP_INT_MAX );

		self::$__instance = null;
	}

	private function __construct() {
		$this->cdn_server = apply_filters( 'jetpack_asset_cdn_url', 'https://cdn.wpvm.io' );
		$this->include_external_assets = apply_filters( 'jetpack_asset_cdn_external_assets', false );

		// allow smaller CSS by only minifying assets on the page
		add_filter( 'jetpack_implode_frontend_css', '__return_false' );

		// concatenate selected CSS and JS tags
		add_filter( 'script_loader_tag', array( $this, 'register_concat_scripts' ), -100, 3 );
		add_filter( 'style_loader_tag', array( $this, 'register_concat_styles' ), -100, 4 );

		// rewrite URLs for selected CSS and JS tags
		add_filter( 'script_loader_src', array( $this, 'rewrite_script_src' ), -100, 2 );
		add_filter( 'style_loader_src', array( $this, 'rewrite_style_src' ), -100, 2 );

		// flush remaining un-printed CDN assets
		add_action( 'wp_head', array( $this, 'render_concatenated_styles_head' ), PHP_INT_MAX );
		add_action( 'wp_head', array( $this, 'render_concatenated_scripts_head' ), PHP_INT_MAX );
		add_action( 'wp_footer', array( $this, 'render_concatenated_styles_footer' ), PHP_INT_MAX );
		add_action( 'wp_footer', array( $this, 'render_concatenated_scripts_footer' ), PHP_INT_MAX );
	}

	/**
	 * Rewrite script or style src optionally, if not being concatenated,
	 * so they're still served from the CDN
	 */

	function rewrite_script_src( $src, $handle ) {
		global $wp_scripts;

		if ( is_admin() || ! isset( $wp_scripts->registered[$handle] ) ) {
			return $src;
		}

		$script = $wp_scripts->registered[$handle];

		if ( ! $this->should_concat_script( $script ) && $this->should_cdn_script( $script ) ) {
			// serve this script from the CDN
			$parts = parse_url( $src );
			$url = $this->cdn_server . '/js';
			$url = add_query_arg( array(
				'b' => "{$parts['scheme']}://{$parts['host']}",
				'f' => array( $parts['path'] ),
				'v' => array( $script->ver )
			), $url );
			return $url;
		}

		return $src;
	}

	function should_cdn_script( $script ) {
		$should_cdn = ( $this->include_external_assets || $this->is_local_url( $script->src ) );
		return apply_filters( 'jetpack_perf_cdn_script', $should_cdn, $script->handle, $script->src );
	}

	function rewrite_style_src( $src, $handle ) {
		global $wp_styles;

		if ( is_admin() || ! isset( $wp_styles->registered[$handle] ) ) {
			return $src;
		}

		$style = $wp_styles->registered[$handle];

		if ( ! $this->should_concat_style( $style ) && $this->should_cdn_style( $style ) ) {
			// serve this style from the CDN
			$parts = parse_url( $src );
			$url = $this->cdn_server . '/js';
			$url = add_query_arg( array(
				'b' => "{$parts['scheme']}://{$parts['host']}",
				'f' => array( $parts['path'] ),
				'v' => array( $style->ver )
			), $url );
			return $url;
		}

		return $src;
	}

	function should_cdn_style( $style ) {
		$should_cdn = ( $this->include_external_assets || $this->is_local_url( $style->src ) );
		return apply_filters( 'jetpack_perf_cdn_style', $should_cdn, $style->handle, $style->src );
	}

	/**
	 * Render functions
	 */

	function render_concatenated_styles_head() {
		$this->flush_concatenated_styles(0);
	}

	function render_concatenated_styles_footer() {
		$this->flush_concatenated_styles(0);
		$this->flush_concatenated_styles(1);
	}

	private function flush_concatenated_styles( $group ) {
		if ( ! isset( $this->concat_style_groups[ $group ] ) ) {
			return;
		}

		$style_groups = $this->concat_style_groups[ $group ];

		if ( empty( $style_groups ) ) {
			return;
		}

		// special URL to concatenation service
		global $wp_styles;
		$site_url = site_url();
		foreach( $style_groups as $media => $styles ) {
			$urls = array();
			$vers = array();

			foreach( $styles as $style ) {
				$urls[] = str_replace( untrailingslashit( $site_url ), '', $style->src );
				$vers[] = $style->ver ? $style->ver : $wp_styles->default_version;
			}

			$cdn_url = $this->cdn_server . '/css?b=' .
				urlencode( $site_url ) . '&' .
				http_build_query( array( 'f' => $urls ) ) . '&' .
				http_build_query( array( 'v' => $vers ) );

			// if we are injecting critical CSS, load the full CSS async
			if ( $this->inject_critical_css ) {
				echo '<link rel="preload" onload="this.rel=\'stylesheet\'" as="style" type="text/css" media="' . $media . '" href="' . esc_attr( $cdn_url ) . '"/>';
			} else {
				echo '<link rel="stylesheet" type="text/css" media="' . $media . '" href="' . esc_attr( $cdn_url ) . '"/>';
			}

			foreach( $styles as $style ) {
				if ( isset( $style->extra['concat-after'] ) && $style->extra['concat-after'] ) {
					printf( "<style id='%s-inline-css' type='text/css'>\n%s\n</style>\n", esc_attr( $style->handle ), implode( "\n", $style->extra['concat-after'] ) );
				}
			}
		}

		$this->concat_style_groups[ $group ] = array();
	}

	function render_concatenated_scripts_head() {
		$this->flush_concatenated_scripts( 0 );
	}

	function render_concatenated_scripts_footer() {
		$this->flush_concatenated_scripts( 0 ); // in case of late-enqueud header styles
		$this->flush_concatenated_scripts( 1 );
	}

	private function flush_concatenated_scripts( $group ) {
		if ( ! isset( $this->concat_script_groups[ $group ] ) ) {
			return;
		}

		$scripts = $this->concat_script_groups[ $group ];

		if ( empty( $scripts ) ) {
			return;
		}

		global $wp_scripts;
		$site_url = site_url();
		$urls = array();
		$vers = array();

		foreach( $scripts as $script ) {
			$urls[] = str_replace( untrailingslashit( $site_url ), '', $script->src );
			$vers[] = $script->ver ? $script->ver : $wp_scripts->default_version;
			if ( isset( $script->extra['before'] ) && $script->extra['before'] ) {
				echo sprintf( "<script type='text/javascript'>\n%s\n</script>\n", $script->extra['before'] );
			}
		}

		$cdn_url = $this->cdn_server . '/js?b=' .
			urlencode( $site_url ) . '&' .
			http_build_query( array( 'f' => $urls ) ) . '&' .
			http_build_query( array( 'v' => $vers ) );

		echo '<script type="text/javascript" src="' . esc_attr( $cdn_url ) . '"></script>';

		foreach( $scripts as $script ) {
			if ( isset( $script->extra['after'] ) && $script->extra['after'] ) {
				echo sprintf( "<script type='text/javascript'>\n%s\n</script>\n", $script->extra['after'] );
			}
		}

		$this->concat_script_groups[ $group ] = array();
	}

	/**
	 * Asset modification functions
	 */

	/**
	 * Scripts
	 */

	public function register_concat_scripts( $tag, $handle, $src ) {
		global $wp_scripts;

		// don't do admin for now
		if ( is_admin() || ! isset( $wp_scripts->registered[$handle] ) ) {
			return $tag;
		}

		$script = $wp_scripts->registered[$handle];

		if ( $this->should_concat_script( $script ) ) {
			$this->buffer_script( $script );
			return '';
		}

		// we flush buffered scripts when we encounter a tag which
		// is not eligible for concatenation, so that ordering is preserved
		$group = isset( $script->extra['group'] ) ? $script->extra['group'] : 0;
		$this->flush_concatenated_scripts( $group );

		return $tag;
	}

	private function should_concat_script( $script ) {
		$should_concat =
			( $this->include_external_assets || $this->is_local_url( $script->src ) )
			&& ! isset( $script->extra['conditional'] );
		return apply_filters( 'jetpack_perf_concat_script', $should_concat, $script->handle, $script->src );
	}

	private function buffer_script( $script ) {
		$group = isset( $script->extra['group'] ) ? $script->extra['group'] : 0;
		if ( ! isset( $this->concat_script_groups[$group] ) ) {
			$this->concat_script_groups[$group] = array();
		}
		$this->concat_script_groups[$group][] = $script;
	}

	/**
	 * Styles
	 */

	public function register_concat_styles( $tag, $handle, $href, $media ) {
		global $wp_styles;

		// don't do admin for now
		if ( is_admin() || ! isset( $wp_styles->registered[$handle] ) ) {
			return $tag;
		}

		$style = $wp_styles->registered[$handle];

		if ( $this->should_concat_style( $style ) ) {
			$this->buffer_style( $style );
			return '';
		}

		return $tag;
	}

	private function buffer_style( $style ) {
		$group = isset( $style->extra['group'] ) ? $style->extra['group'] : 0;
		$media = $style->args;

		// rename the 'after' code so that we can output it separately
		if ( isset( $style->extra['after'] ) ) {
			$style->extra['concat-after'] = $style->extra['after'];
			unset( $style->extra['after'] );
		}

		if ( ! $media ) {
			$media = 'all';
		}

		if ( ! isset( $this->concat_style_groups[$group] ) ) {
			$this->concat_style_groups[$group] = array();
		}

		if ( ! isset( $this->concat_style_groups[$group][$media] ) ) {
			$this->concat_style_groups[$group][$media] = array();
		}

		$this->concat_style_groups[$group][$media][] = $style;
	}

	private function should_concat_style( $style ) {
		$should_concat =
		( $this->include_external_assets || $this->is_local_url( $style->src ) )
		&& ! isset( $style->extra['conditional'] );

		return apply_filters( 'jetpack_perf_concat_style', $should_concat, $style->handle, $style->src );
	}

	private function is_local_url( $url ) {
		$site_url = site_url();
		return ( strncmp( $url, '/', 1 ) === 0 && strncmp( $url, '//', 2 ) !== 0 )
			|| strpos( $url, $site_url ) === 0;
	}
}

1		<?php
2
3		/**
4		* TODO
		0 ignored issues – show Coding Style introduced 2017-11-14 04:48 UTC by Report Bug Copy Issue Report Comment refers to a TODO task This check looks `TODO` comments that have been left in the code. ``TODO``s show that something is left unfinished and should be attended to. Loading history...
5		* - asset inlining for smaller styles?
6		* - critical CSS support?
7		* - non-enqueued assets?
8		*/
9
10		class Jetpack_Asset_CDN {
11		private static $__instance = null;
12
13		private $cdn_server;
14		private $concat_style_groups = array();
15		private $concat_script_groups = array();
16		private $inject_critical_css = false;
17		private $include_external_assets = false;
18		private $max_assets_per_tag = 1;
		0 ignored issues – show Unused Code introduced 2017-11-17 00:10 UTC by Report Bug Copy Issue Report The property `$max_assets_per_tag` is not used and could be removed. This check marks private properties in classes that are never used. Those properties can be removed. Loading history...
19
20		/**
21		* Singleton implementation
22		*
23		* @return object
24		*/
25		public static function instance() {
26		if ( ! is_a( self::$__instance, 'Jetpack_Asset_CDN' ) ) {
27		self::$__instance = new Jetpack_Asset_CDN();
28		}
29
30		return self::$__instance;
31		}
32
33		public static function reset() {
34		if ( null === self::$__instance ) {
35		return;
36		}
37
38		// allow smaller CSS by only minifying assets on the page
39		remove_filter( 'jetpack_implode_frontend_css', '__return_false' );
40
41		// concatenate selected CSS and JS tags
42		remove_filter( 'script_loader_tag', array( self::$__instance, 'register_concat_scripts' ), -100 );
43		remove_filter( 'style_loader_tag', array( self::$__instance, 'register_concat_styles' ), -100 );
44
45		// render buffered assets
46		remove_action( 'wp_head', array( self::$__instance, 'render_concatenated_styles_head' ), PHP_INT_MAX );
47		remove_action( 'wp_head', array( self::$__instance, 'render_concatenated_scripts_head' ), PHP_INT_MAX );
48		remove_action( 'wp_footer', array( self::$__instance, 'render_concatenated_styles_footer' ), PHP_INT_MAX );
49		remove_action( 'wp_footer', array( self::$__instance, 'render_concatenated_scripts_footer' ), PHP_INT_MAX );
50
51		self::$__instance = null;
52		}
53
54		private function __construct() {
55		$this->cdn_server = apply_filters( 'jetpack_asset_cdn_url', 'https://cdn.wpvm.io' );
56		$this->include_external_assets = apply_filters( 'jetpack_asset_cdn_external_assets', false );
57
58		// allow smaller CSS by only minifying assets on the page
59		add_filter( 'jetpack_implode_frontend_css', '__return_false' );
60
61		// concatenate selected CSS and JS tags
62		add_filter( 'script_loader_tag', array( $this, 'register_concat_scripts' ), -100, 3 );
63		add_filter( 'style_loader_tag', array( $this, 'register_concat_styles' ), -100, 4 );
64
65		// rewrite URLs for selected CSS and JS tags
66		add_filter( 'script_loader_src', array( $this, 'rewrite_script_src' ), -100, 2 );
67		add_filter( 'style_loader_src', array( $this, 'rewrite_style_src' ), -100, 2 );
68
69		// flush remaining un-printed CDN assets
70		add_action( 'wp_head', array( $this, 'render_concatenated_styles_head' ), PHP_INT_MAX );
71		add_action( 'wp_head', array( $this, 'render_concatenated_scripts_head' ), PHP_INT_MAX );
72		add_action( 'wp_footer', array( $this, 'render_concatenated_styles_footer' ), PHP_INT_MAX );
73		add_action( 'wp_footer', array( $this, 'render_concatenated_scripts_footer' ), PHP_INT_MAX );
74		}
75
76		/**
77		* Rewrite script or style src optionally, if not being concatenated,
78		* so they're still served from the CDN
79		*/
80
81	View Code Duplication	function rewrite_script_src( $src, $handle ) {
82		global $wp_scripts;
83
84		if ( is_admin() \|\| ! isset( $wp_scripts->registered[$handle] ) ) {
85		return $src;
86		}
87
88		$script = $wp_scripts->registered[$handle];
89
90		if ( ! $this->should_concat_script( $script ) && $this->should_cdn_script( $script ) ) {
91		// serve this script from the CDN
92		$parts = parse_url( $src );
93		$url = $this->cdn_server . '/js';
94		$url = add_query_arg( array(
95		'b' => "{$parts['scheme']}://{$parts['host']}",
96		'f' => array( $parts['path'] ),
97		'v' => array( $script->ver )
98		), $url );
99		return $url;
100		}
101
102		return $src;
103		}
104
105		function should_cdn_script( $script ) {
106		$should_cdn = ( $this->include_external_assets \|\| $this->is_local_url( $script->src ) );
107		return apply_filters( 'jetpack_perf_cdn_script', $should_cdn, $script->handle, $script->src );
108		}
109
110	View Code Duplication	function rewrite_style_src( $src, $handle ) {
111		global $wp_styles;
112
113		if ( is_admin() \|\| ! isset( $wp_styles->registered[$handle] ) ) {
114		return $src;
115		}
116
117		$style = $wp_styles->registered[$handle];
118
119		if ( ! $this->should_concat_style( $style ) && $this->should_cdn_style( $style ) ) {
120		// serve this style from the CDN
121		$parts = parse_url( $src );
122		$url = $this->cdn_server . '/js';
123		$url = add_query_arg( array(
124		'b' => "{$parts['scheme']}://{$parts['host']}",
125		'f' => array( $parts['path'] ),
126		'v' => array( $style->ver )
127		), $url );
128		return $url;
129		}
130
131		return $src;
132		}
133
134		function should_cdn_style( $style ) {
135		$should_cdn = ( $this->include_external_assets \|\| $this->is_local_url( $style->src ) );
136		return apply_filters( 'jetpack_perf_cdn_style', $should_cdn, $style->handle, $style->src );
137		}
138
139		/**
140		* Render functions
141		*/
142
143		function render_concatenated_styles_head() {
144		$this->flush_concatenated_styles(0);
145		}
146
147		function render_concatenated_styles_footer() {
148		$this->flush_concatenated_styles(0);
149		$this->flush_concatenated_styles(1);
150		}
151
152		private function flush_concatenated_styles( $group ) {
153		if ( ! isset( $this->concat_style_groups[ $group ] ) ) {
154		return;
155		}
156
157		$style_groups = $this->concat_style_groups[ $group ];
158
159		if ( empty( $style_groups ) ) {
160		return;
161		}
162
163		// special URL to concatenation service
164		global $wp_styles;
165		$site_url = site_url();
166		foreach( $style_groups as $media => $styles ) {
167		$urls = array();
168		$vers = array();
169
170		foreach( $styles as $style ) {
171		$urls[] = str_replace( untrailingslashit( $site_url ), '', $style->src );
172		$vers[] = $style->ver ? $style->ver : $wp_styles->default_version;
173		}
174
175		$cdn_url = $this->cdn_server . '/css?b=' .
176		urlencode( $site_url ) . '&' .
177		http_build_query( array( 'f' => $urls ) ) . '&' .
178		http_build_query( array( 'v' => $vers ) );
179
180		// if we are injecting critical CSS, load the full CSS async
181		if ( $this->inject_critical_css ) {
182		echo '<link rel="preload" onload="this.rel=\'stylesheet\'" as="style" type="text/css" media="' . $media . '" href="' . esc_attr( $cdn_url ) . '"/>';
183		} else {
184		echo '<link rel="stylesheet" type="text/css" media="' . $media . '" href="' . esc_attr( $cdn_url ) . '"/>';
185		}
186
187		foreach( $styles as $style ) {
188		if ( isset( $style->extra['concat-after'] ) && $style->extra['concat-after'] ) {
189		printf( "<style id='%s-inline-css' type='text/css'>\n%s\n</style>\n", esc_attr( $style->handle ), implode( "\n", $style->extra['concat-after'] ) );
190		}
191		}
192		}
193
194		$this->concat_style_groups[ $group ] = array();
195		}
196
197		function render_concatenated_scripts_head() {
198		$this->flush_concatenated_scripts( 0 );
199		}
200
201		function render_concatenated_scripts_footer() {
202		$this->flush_concatenated_scripts( 0 ); // in case of late-enqueud header styles
203		$this->flush_concatenated_scripts( 1 );
204		}
205
206		private function flush_concatenated_scripts( $group ) {
207		if ( ! isset( $this->concat_script_groups[ $group ] ) ) {
208		return;
209		}
210
211		$scripts = $this->concat_script_groups[ $group ];
212
213		if ( empty( $scripts ) ) {
214		return;
215		}
216
217		global $wp_scripts;
218		$site_url = site_url();
219		$urls = array();
220		$vers = array();
221
222		foreach( $scripts as $script ) {
223		$urls[] = str_replace( untrailingslashit( $site_url ), '', $script->src );
224		$vers[] = $script->ver ? $script->ver : $wp_scripts->default_version;
225		if ( isset( $script->extra['before'] ) && $script->extra['before'] ) {
226		echo sprintf( "<script type='text/javascript'>\n%s\n</script>\n", $script->extra['before'] );
227		}
228		}
229
230		$cdn_url = $this->cdn_server . '/js?b=' .
231		urlencode( $site_url ) . '&' .
232		http_build_query( array( 'f' => $urls ) ) . '&' .
233		http_build_query( array( 'v' => $vers ) );
234
235		echo '<script type="text/javascript" src="' . esc_attr( $cdn_url ) . '"></script>';
236
237		foreach( $scripts as $script ) {
238		if ( isset( $script->extra['after'] ) && $script->extra['after'] ) {
239		echo sprintf( "<script type='text/javascript'>\n%s\n</script>\n", $script->extra['after'] );
240		}
241		}
242
243		$this->concat_script_groups[ $group ] = array();
244		}
245
246		/**
247		* Asset modification functions
248		*/
249
250		/**
251		* Scripts
252		*/
253
254		public function register_concat_scripts( $tag, $handle, $src ) {
255		global $wp_scripts;
256
257		// don't do admin for now
258		if ( is_admin() \|\| ! isset( $wp_scripts->registered[$handle] ) ) {
259		return $tag;
260		}
261
262		$script = $wp_scripts->registered[$handle];
263
264		if ( $this->should_concat_script( $script ) ) {
265		$this->buffer_script( $script );
266		return '';
267		}
268
269		// we flush buffered scripts when we encounter a tag which
270		// is not eligible for concatenation, so that ordering is preserved
271		$group = isset( $script->extra['group'] ) ? $script->extra['group'] : 0;
272		$this->flush_concatenated_scripts( $group );
273
274		return $tag;
275		}
276
277		private function should_concat_script( $script ) {
278		$should_concat =
279		( $this->include_external_assets \|\| $this->is_local_url( $script->src ) )
280		&& ! isset( $script->extra['conditional'] );
281		return apply_filters( 'jetpack_perf_concat_script', $should_concat, $script->handle, $script->src );
282		}
283
284		private function buffer_script( $script ) {
285		$group = isset( $script->extra['group'] ) ? $script->extra['group'] : 0;
286		if ( ! isset( $this->concat_script_groups[$group] ) ) {
287		$this->concat_script_groups[$group] = array();
288		}
289		$this->concat_script_groups[$group][] = $script;
290		}
291
292		/**
293		* Styles
294		*/
295
296		public function register_concat_styles( $tag, $handle, $href, $media ) {
297		global $wp_styles;
298
299		// don't do admin for now
300		if ( is_admin() \|\| ! isset( $wp_styles->registered[$handle] ) ) {
301		return $tag;
302		}
303
304		$style = $wp_styles->registered[$handle];
305
306		if ( $this->should_concat_style( $style ) ) {
307		$this->buffer_style( $style );
308		return '';
309		}
310
311		return $tag;
312		}
313
314		private function buffer_style( $style ) {
315		$group = isset( $style->extra['group'] ) ? $style->extra['group'] : 0;
316		$media = $style->args;
317
318		// rename the 'after' code so that we can output it separately
319		if ( isset( $style->extra['after'] ) ) {
320		$style->extra['concat-after'] = $style->extra['after'];
321		unset( $style->extra['after'] );
322		}
323
324		if ( ! $media ) {
325		$media = 'all';
326		}
327
328		if ( ! isset( $this->concat_style_groups[$group] ) ) {
329		$this->concat_style_groups[$group] = array();
330		}
331
332		if ( ! isset( $this->concat_style_groups[$group][$media] ) ) {
333		$this->concat_style_groups[$group][$media] = array();
334		}
335
336		$this->concat_style_groups[$group][$media][] = $style;
337		}
338
339		private function should_concat_style( $style ) {
340		$should_concat =
341		( $this->include_external_assets \|\| $this->is_local_url( $style->src ) )
342		&& ! isset( $style->extra['conditional'] );
343
344		return apply_filters( 'jetpack_perf_concat_style', $should_concat, $style->handle, $style->src );
345		}
346
347		private function is_local_url( $url ) {
348		$site_url = site_url();
349		return ( strncmp( $url, '/', 1 ) === 0 && strncmp( $url, '//', 2 ) !== 0 )
350		\|\| strpos( $url, $site_url ) === 0;
351		}
352		}

Automattic / jetpack

Push — add/asset-cdn ( 3084e4...3a5f88 )

Jetpack_Asset_CDN::flush_concatenated_styles() D

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