From f20f62b27d4253b16ba744aa3cad8a69d08b29ae Mon Sep 17 00:00:00 2001
From: azaozz <azaozz@1a063a9b-81f0-0310-95a4-ce76da25c4cd>
Date: Mon, 26 Jan 2009 12:59:10 +0000
Subject: [PATCH] Improvements to the script loader: allows plugins to queue
 scripts for the front end head and footer, adds hooks for server side caching
 of compressed scripts, adds support for ENFORCE_GZIP constant (deflate is
 used by default since it's faster), see #8628, fixes #8884

git-svn-id: http://svn.automattic.com/wordpress/trunk@10442 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-admin/includes/template.php   |   4 +-
 wp-admin/load-scripts.php        |  27 ++++---
 wp-admin/load-styles.php         |  12 ++--
 wp-includes/class.wp-scripts.php |  23 ++++--
 wp-includes/class.wp-styles.php  |   6 +-
 wp-includes/default-filters.php  |  12 ++--
 wp-includes/script-loader.php    | 118 +++++++++++++++++++++----------
 7 files changed, 137 insertions(+), 65 deletions(-)

diff --git a/wp-admin/includes/template.php b/wp-admin/includes/template.php
index c9bcfb4420..7a9f2e2c3e 100644
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -3395,7 +3395,7 @@ function screen_icon($name = '') {
 }
 
 /**
- * Test support for compressed JavaScript and CSS
+ * Test support for compressing JavaScript from PHP
  *
  * Outputs JavaScript that tests if compression from PHP works as expected
  * and sets an option with the result. Has no effect when the current user
@@ -3406,7 +3406,7 @@ function screen_icon($name = '') {
  */
 function compression_test() {
 ?>
-	<script type="text/javascript" src="load-scripts.php?test=1"></script>
+	<script type="text/javascript" src="load-scripts.php?test=1<?php echo ( defined('ENFORCE_GZIP') && ENFORCE_GZIP ) ? '&c=gzip' : ''; ?>"></script>
 	<script type="text/javascript">
 	/* <![CDATA[ */
 	(function() {
diff --git a/wp-admin/load-scripts.php b/wp-admin/load-scripts.php
index 07573a6f52..a409ad017e 100644
--- a/wp-admin/load-scripts.php
+++ b/wp-admin/load-scripts.php
@@ -92,14 +92,19 @@ if ( isset($_GET['test']) && 1 == $_GET['test'] ) {
 	if ( ini_get('zlib.output_compression') )
 		exit('');
 
-	if ( false !== strpos( strtolower($_SERVER['HTTP_ACCEPT_ENCODING']), 'gzip') && function_exists('gzencode') ) {
+	$out = 'var wpCompressionTest = 1;';
+	$force_gzip = ( isset($_GET['c']) && 'gzip' == $_GET['c'] );
+
+	if ( false !== strpos( strtolower($_SERVER['HTTP_ACCEPT_ENCODING']), 'deflate') && function_exists('gzdeflate') && ! $force_gzip ) {
+		header('Content-Encoding: deflate');
+		$out = gzdeflate( $out, 3 );
+	} elseif ( false !== strpos( strtolower($_SERVER['HTTP_ACCEPT_ENCODING']), 'gzip') && function_exists('gzencode') ) {
 		header('Content-Encoding: gzip');
-		$out = gzencode( 'var wpCompressionTest = 1;', 3 );
-	}
-	
-	if ( ! isset($out) )
+		$out = gzencode( $out, 3 );
+	} else {
 		exit('');
-	
+	}
+
 	header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );
 	header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT' );
 	header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
@@ -118,7 +123,8 @@ if ( empty($load) )
 require(ABSPATH . '/wp-includes/script-loader.php');
 require(ABSPATH . '/wp-includes/version.php');
 
-$compress = ( isset($_GET['c']) && 1 == $_GET['c'] );
+$compress = ( isset($_GET['c']) && $_GET['c'] );
+$force_gzip = ( $compress && 'gzip' == $_GET['c'] );
 $expires_offset = 31536000;
 $out = '';
 
@@ -137,9 +143,12 @@ header('Content-Type: application/x-javascript; charset=UTF-8');
 header('Expires: ' . gmdate( "D, d M Y H:i:s", time() + $expires_offset ) . ' GMT');
 header("Cache-Control: public, max-age=$expires_offset");
 	
-if ( $compress && ! ini_get('zlib.output_compression') && function_exists('gzencode') ) {
+if ( $compress && ! ini_get('zlib.output_compression') ) {
 	header('Vary: Accept-Encoding'); // Handle proxies
-	if ( false !== strpos( strtolower($_SERVER['HTTP_ACCEPT_ENCODING']), 'gzip') ) {
+	if ( false !== strpos( strtolower($_SERVER['HTTP_ACCEPT_ENCODING']), 'deflate') && function_exists('gzdeflate') && ! $force_gzip ) {
+		header('Content-Encoding: deflate');
+		$out = gzdeflate( $out, 3 );
+	} elseif ( false !== strpos( strtolower($_SERVER['HTTP_ACCEPT_ENCODING']), 'gzip') && function_exists('gzencode') ) {
 		header('Content-Encoding: gzip');
 		$out = gzencode( $out, 3 );
 	}
diff --git a/wp-admin/load-styles.php b/wp-admin/load-styles.php
index ddbf065079..773ec945c4 100644
--- a/wp-admin/load-styles.php
+++ b/wp-admin/load-styles.php
@@ -97,8 +97,9 @@ $load = explode(',', $load);
 if ( empty($load) )
 	exit;
 
-$compress = ( isset($_GET['c']) && 1 == $_GET['c'] );
-$rtl = ( isset($_GET['rtl']) && 1 == $_GET['rtl'] );
+$compress = ( isset($_GET['c']) && $_GET['c'] );
+$force_gzip = ( $compress && 'gzip' == $_GET['c'] );
+$rtl = ( isset($_GET['dir']) && 'rtl' == $_GET['dir'] );
 $expires_offset = 31536000;
 $out = '';
 
@@ -126,9 +127,12 @@ header('Content-Type: text/css');
 header('Expires: ' . gmdate( "D, d M Y H:i:s", time() + $expires_offset ) . ' GMT');
 header("Cache-Control: public, max-age=$expires_offset");
 	
-if ( $compress && ! ini_get('zlib.output_compression') && function_exists('gzencode') ) {
+if ( $compress && ! ini_get('zlib.output_compression') ) {
 	header('Vary: Accept-Encoding'); // Handle proxies
-	if ( false !== strpos( strtolower($_SERVER['HTTP_ACCEPT_ENCODING']), 'gzip') ) {
+	if ( false !== strpos( strtolower($_SERVER['HTTP_ACCEPT_ENCODING']), 'deflate') && function_exists('gzdeflate') && ! $force_gzip ) {
+		header('Content-Encoding: deflate');
+		$out = gzdeflate( $out, 3 );
+	} elseif ( false !== strpos( strtolower($_SERVER['HTTP_ACCEPT_ENCODING']), 'gzip') && function_exists('gzencode') ) {
 		header('Content-Encoding: gzip');
 		$out = gzencode( $out, 3 );
 	}
diff --git a/wp-includes/class.wp-scripts.php b/wp-includes/class.wp-scripts.php
index 2f6977676a..a26b887899 100644
--- a/wp-includes/class.wp-scripts.php
+++ b/wp-includes/class.wp-scripts.php
@@ -26,7 +26,8 @@ class WP_Scripts extends WP_Dependencies {
 	var $do_concat = false;
 	var $print_html = '';
 	var $print_code = '';
-	var $src = '';
+	var $ext_handles = '';
+	var $ext_version = '';
 	var $default_dirs;
 
 	function __construct() {
@@ -99,9 +100,12 @@ class WP_Scripts extends WP_Dependencies {
 			$srce = apply_filters( 'script_loader_src', $src, $handle );
 			if ( $this->in_default_dir($srce) ) {
 				$this->print_code .= $this->print_scripts_l10n( $handle, false );
-				$this->concat .= $handle . ',';
-				$this->concat_version .= $ver;
+				$this->concat .= "$handle,";
+				$this->concat_version .= "$handle$ver";
 				return true;
+			} else {
+				$this->ext_handles .= "$handle,";
+				$this->ext_version .= "$handle$ver";
 			}
 		}
 
@@ -110,7 +114,6 @@ class WP_Scripts extends WP_Dependencies {
 			$src = $this->base_url . $src;
 		}
 
-		$this->src .= "$src,";
 		$src = add_query_arg('ver', $ver, $src);
 		$src = clean_url(apply_filters( 'script_loader_src', $src, $handle ));
 
@@ -146,7 +149,7 @@ class WP_Scripts extends WP_Dependencies {
 		parent::set_group( $handle, $recursion, $grp );
 	}
 
-	function all_deps( $handles, $recursion = false ) {
+	function all_deps( $handles, $recursion = false, $group = false ) {
 		$r = parent::all_deps( $handles, $recursion );
 		if ( !$recursion )
 			$this->to_do = apply_filters( 'print_scripts_array', $this->to_do );
@@ -181,4 +184,14 @@ class WP_Scripts extends WP_Dependencies {
 		}
 		return false;
 	}
+
+	function reset() {
+		$this->do_concat = false;
+		$this->print_code = '';
+		$this->concat = '';
+		$this->concat_version = '';
+		$this->print_html = '';
+		$this->ext_version = '';
+		$this->ext_handles = '';
+	}
 }
diff --git a/wp-includes/class.wp-styles.php b/wp-includes/class.wp-styles.php
index c67bf20989..7031ad0294 100644
--- a/wp-includes/class.wp-styles.php
+++ b/wp-includes/class.wp-styles.php
@@ -41,8 +41,8 @@ class WP_Styles extends WP_Dependencies {
 
 		if ( $this->do_concat ) {
 			if ( $this->in_default_dir($this->registered[$handle]->src) && !isset($this->registered[$handle]->extra['conditional']) && !isset($this->registered[$handle]->extra['alt']) ) {
-				$this->concat .= $handle . ',';
-				$this->concat_version .= $ver;
+				$this->concat .= "$handle,";
+				$this->concat_version .= "$handle$ver";
 				return true;
 			}
 		}
@@ -88,7 +88,7 @@ class WP_Styles extends WP_Dependencies {
 		return true;
 	}
 
-	function all_deps( $handles, $recursion = false ) {
+	function all_deps( $handles, $recursion = false, $group = false ) {
 		$r = parent::all_deps( $handles, $recursion );
 		if ( !$recursion )
 			$this->to_do = apply_filters( 'print_styles_array', $this->to_do );
diff --git a/wp-includes/default-filters.php b/wp-includes/default-filters.php
index e3d0fcc11a..b4253c4a94 100644
--- a/wp-includes/default-filters.php
+++ b/wp-includes/default-filters.php
@@ -164,15 +164,17 @@ add_filter( 'editable_slug', 'urldecode' );
 add_filter('atom_service_url','atom_service_url_filter');
 
 // Actions
+add_action('wp_head', 'wp_enqueue_scripts', 1);
 add_action('wp_head', 'feed_links_extra', 3);
 add_action('wp_head', 'rsd_link');
 add_action('wp_head', 'wlwmanifest_link');
 add_action('wp_head', 'locale_stylesheet');
 add_action('publish_future_post', 'check_and_publish_future_post', 10, 1);
 add_action('wp_head', 'noindex', 1);
-add_action('wp_head', 'wp_print_styles', 9);
-add_action('wp_head', 'wp_print_scripts');
+add_action('wp_head', 'wp_print_styles', 8);
+add_action('wp_head', 'wp_print_head_scripts', 9);
 add_action('wp_head', 'wp_generator');
+add_action('wp_footer', 'wp_print_footer_scripts');
 if(!defined('DOING_CRON'))
 	add_action('init', 'wp_cron');
 add_action('do_feed_rdf', 'do_feed_rdf', 10, 1);
@@ -182,9 +184,9 @@ add_action('do_feed_atom', 'do_feed_atom', 10, 1);
 add_action('do_pings', 'do_all_pings', 10, 1);
 add_action('do_robots', 'do_robots');
 add_action('sanitize_comment_cookies', 'sanitize_comment_cookies');
-add_action('admin_print_scripts', 'wp_print_head_scripts', 20);
-add_action('admin_print_footer_scripts', 'wp_print_footer_scripts', 20);
-add_action('admin_print_styles', 'wp_print_admin_styles', 20);
+add_action('admin_print_scripts', 'print_head_scripts', 20);
+add_action('admin_print_footer_scripts', 'print_footer_scripts', 20);
+add_action('admin_print_styles', 'print_admin_styles', 20);
 add_action('init', 'smilies_init', 5);
 add_action( 'plugins_loaded', 'wp_maybe_load_widgets', 0 );
 add_action( 'shutdown', 'wp_ob_end_flush_all', 1);
diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 2f4f0288f6..b37ba09cb1 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -526,57 +526,53 @@ function wp_style_loader_src( $src, $handle ) {
 }
 
 /**
- * Print the script queue in the HTML head.
+ * Prints the script queue in the HTML head on admin pages.
  *
  * Postpones the scripts that were queued for the footer.
- * wp_print_footer_scripts() has to be called in the footer to print these scripts.
+ * print_footer_scripts() is called in the footer to print these scripts.
  *
- * @since unknown
+ * @since 2.8
  * @see wp_print_scripts()
  */
-function wp_print_head_scripts() {
-	do_action( 'wp_print_scripts' );
+function print_head_scripts() {
+	if ( ! did_action('wp_print_scripts') )
+		do_action('wp_print_scripts');
+
 	global $wp_scripts, $concatenate_scripts;
 
 	if ( !is_a($wp_scripts, 'WP_Scripts') )
 		$wp_scripts = new WP_Scripts();
 
-	if ( ! isset($concatenate_scripts) )
-		script_concat_settings();
-
+	script_concat_settings();
 	$wp_scripts->do_concat = $concatenate_scripts;
 	$wp_scripts->do_head_items();
 
 	if ( apply_filters('print_head_scripts', true) )
 		_pring_scripts();
 
-	$wp_scripts->do_concat = false;
-	$wp_scripts->print_code = $wp_scripts->concat = $wp_scripts->concat_version = $wp_scripts->print_html = $wp_scripts->src = '';
+	$wp_scripts->reset();
 	return $wp_scripts->done;
 }
 
 /**
- * Print the scripts that were queued for the footer.
+ * Prints the scripts that were queued for the footer on admin pages.
  *
- * @since unknown
+ * @since 2.8
  */
-function wp_print_footer_scripts() {
+function print_footer_scripts() {
 	global $wp_scripts, $concatenate_scripts;
 
 	if ( !is_a($wp_scripts, 'WP_Scripts') )
 		return array(); // No need to run if not instantiated.
 
-	if ( ! isset($concatenate_scripts) )
-		script_concat_settings();
-
+	script_concat_settings();
 	$wp_scripts->do_concat = $concatenate_scripts;
 	$wp_scripts->do_footer_items();
 
 	if ( apply_filters('print_footer_scripts', true) )
 		_pring_scripts();
 
-	$wp_scripts->do_concat = false;
-	$wp_scripts->concat = $wp_scripts->concat_version = $wp_scripts->print_code = $wp_scripts->print_html = $wp_scripts->src = '';
+	$wp_scripts->reset();
 	return $wp_scripts->done;
 }
 
@@ -584,6 +580,8 @@ function _pring_scripts() {
 	global $wp_scripts, $compress_scripts;
 
 	$zip = $compress_scripts ? 1 : 0;
+	if ( $zip && defined('ENFORCE_GZIP') && ENFORCE_GZIP )
+		$zip = 'gzip';
 
 	if ( !empty($wp_scripts->concat) ) {
 
@@ -595,35 +593,75 @@ function _pring_scripts() {
 			echo "</script>\n";
 		}
 
-		$ver = md5("$wp_scripts->concat" . "$wp_scripts->concat_version");
-		$src = $wp_scripts->base_url . "/wp-admin/load-scripts.php?c={$zip}&load=" . rtrim($wp_scripts->concat, ',') . "&ver=$ver";
+		$ver = md5("$wp_scripts->concat_version");
+		$src = $wp_scripts->base_url . "/wp-admin/load-scripts.php?c={$zip}&load=" . trim($wp_scripts->concat, ', ') . "&ver=$ver";
 		echo "<script type='text/javascript' src='$src'></script>\n";
 	}
 
 	if ( !empty($wp_scripts->print_html) )
 		echo $wp_scripts->print_html;
-
 }
 
-function wp_print_admin_styles() {
+/**
+ * Prints the script queue in the HTML head on the front end.
+ *
+ * Postpones the scripts that were queued for the footer.
+ * wp_print_footer_scripts() is called in the footer to print these scripts.
+ *
+ * @since 2.8
+ */
+function wp_print_head_scripts() {
+	if ( ! did_action('wp_print_scripts') )
+		do_action('wp_print_scripts');
+
+	global $wp_scripts;
+	
+	if ( !is_a($wp_scripts, 'WP_Scripts') )
+		return array(); // no need to run if nothing is queued
+	
+	return print_head_scripts();
+}
+
+/**
+ * Prints the scripts that were queued for the footer on the front end.
+ *
+ * @since 2.8
+ */
+function wp_print_footer_scripts() {
+	return print_footer_scripts();
+}
+
+/**
+ * Wrapper for do_action('wp_enqueue_scripts')
+ *  
+ * Allows plugins to queue scripts for the front end using wp_enqueue_script().
+ * Runs first in wp_head() where all is_home(), is_page(), etc. functions are available.
+ *
+ * @since 2.8
+ */
+function wp_enqueue_scripts() {
+	do_action('wp_enqueue_scripts');
+}
+
+function print_admin_styles() {
 	global $wp_styles, $concatenate_scripts, $compress_css;
 
 	if ( !is_a($wp_styles, 'WP_Styles') )
 		$wp_styles = new WP_Styles();
 
-	if ( ! isset($concatenate_scripts) )
-		script_concat_settings();
-
+	script_concat_settings();
 	$wp_styles->do_concat = $concatenate_scripts;
 	$zip = $compress_css ? 1 : 0;
+	if ( $zip && defined('ENFORCE_GZIP') && ENFORCE_GZIP )
+		$zip = 'gzip';
 
 	$wp_styles->do_items(false);
 
 	if ( apply_filters('print_admin_styles', true) ) {
 		if ( !empty($wp_styles->concat) ) {
-			$ver = md5("$wp_styles->concat" . "$wp_styles->concat_version");
-			$rtl = 'rtl' === $wp_styles->text_direction ? 1 : 0;
-			$href = $wp_styles->base_url . "/wp-admin/load-styles.php?c={$zip}&rtl={$rtl}&load=" . rtrim($wp_styles->concat, ',') . "&ver=$ver";
+			$dir = $wp_styles->text_direction;
+			$ver = md5("$wp_styles->concat_version{$dir}");
+			$href = $wp_styles->base_url . "/wp-admin/load-styles.php?c={$zip}&dir={$dir}&load=" . trim($wp_styles->concat, ', ') . "&ver=$ver";
 			echo "<link rel='stylesheet' href='$href' type='text/css' media='all' />\n";
 		}
 
@@ -639,17 +677,23 @@ function wp_print_admin_styles() {
 function script_concat_settings() {
 	global $concatenate_scripts, $compress_scripts, $compress_css;
 
-	$concatenate_scripts = defined('CONCATENATE_SCRIPTS') ? CONCATENATE_SCRIPTS : true;
-	if ( $concatenate_scripts && -1 == get_option('concatenate_scripts') )
-		$concatenate_scripts = false;
+	if ( ! isset($concatenate_scripts) ) {
+		$concatenate_scripts = defined('CONCATENATE_SCRIPTS') ? CONCATENATE_SCRIPTS : true;
+		if ( ! is_admin() || ( $concatenate_scripts && -1 == get_user_option('concatenate_scripts') ) )
+			$concatenate_scripts = false;
+	}
 
-	$compress_scripts = defined('COMPRESS_SCRIPTS') ? COMPRESS_SCRIPTS : true;
-	if ( $compress_scripts && ! get_option('can_compress_scripts') )
-		$compress_scripts = false;
+	if ( ! isset($compress_scripts) ) {
+		$compress_scripts = defined('COMPRESS_SCRIPTS') ? COMPRESS_SCRIPTS : true;
+		if ( $compress_scripts && ! get_option('can_compress_scripts') )
+			$compress_scripts = false;
+	}
 
-	$compress_css = defined('COMPRESS_CSS') ? COMPRESS_CSS : true;
-	if ( $compress_css && ! get_option('can_compress_scripts') )
-		$compress_css = false;
+	if ( ! isset($compress_css) ) {
+		$compress_css = defined('COMPRESS_CSS') ? COMPRESS_CSS : true;
+		if ( $compress_css && ! get_option('can_compress_scripts') )
+			$compress_css = false;
+	}
 }
 
 add_action( 'wp_default_scripts', 'wp_default_scripts' );