<?php

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/**

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* Manages a frontend inline CSS or JavaScript resource.

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*

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* If possible, the resource will be served as a static file for better performance. It can be

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* tied to a specific post or it can be 'global'. The resource can be output, static or inline,

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* to one of four locations on the page:

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*

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* * `head-early`: right AFTER theme styles have been enqueued

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* * `head` : right BEFORE the theme and wp's inline custom css

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* * `head-late` : right AFTER the theme and wp's inline custom css

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* * `footer` : in the footer

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*

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* The first time the class is instantiated, a static callback method will be registered for each

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* output location. Inside each callback, we'll iterate over any/all instances that are assigned

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* to the current output location and perform the following steps:

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*

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* 1. If a static file exists for the resource, go to the next step. Otherwise, try to create

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* a static file for the resource if it has `data`. If it doesn't have `data`, assign it to

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* the next output location and then move on to the next resource (continue).

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* 2. If a static file exists for the resource, enqueue it (via WP or manually) and then move on

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* to the next resource (continue). If no static file exists, go to the next step.

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* 3. Output the resource inline.

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*

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* @since 2.0

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*

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* @package ET\Core

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*/

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class ET_Core_PageResource {

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private static $_LOCK_FILE;

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/**

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* Output locations.

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*

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* @var string[]

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*/

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private static $_OUTPUT_LOCATIONS = array(

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'head-early',

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'head',

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'head-late',

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'footer',

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);

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/**

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* Resource owners.

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*

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* @var string[]

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*/

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private static $_OWNERS = array(

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'divi',

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'builder',

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'epanel',

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'extra',

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'core',

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'bloom',

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'monarch',

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'custom',

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'all',

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);

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/**

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* Resource scopes.

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*

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* @var string[]

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*/

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private static $_SCOPES = array(

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'global',

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'post',

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);

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private static $_TEMP_DIRS = array();

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/**

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* Resource types.

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*

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* @var string[]

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*/

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private static $_TYPES = array(

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'style',

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'script',

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);

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/**

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* Whether or not we have write access to the filesystem.

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*

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* @var bool

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*/

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private static $_can_write;

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private static $_onerror = 'et_core_page_resource_fallback(this, true)';

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private static $_onload = 'et_core_page_resource_fallback(this)';

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private static $_request_id;

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private static $_request_time;

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/**

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* All instances of this class.

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*

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* @var ET_Core_PageResource[] {

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*

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* @type ET_Core_PageResource $slug

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* }

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*/

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private static $_resources;

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/**

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* All instances of this class organized by output location and sorted by priority.

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*

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* @var array[] {

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*

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* @type array[] $location {@see self::$_OUTPUT_LOCATIONS} {

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*

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* @type ET_Core_PageResource[] $priority {

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*

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* @type ET_Core_PageResource $slug

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* }

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* }

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* }

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*/

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private static $_resources_by_location;

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/**

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* All instances of this class organized by scope.

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*

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* @var array[] {

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*

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* @type ET_Core_PageResource[] $post|$global {

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*

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* @type ET_Core_PageResource $slug

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* }

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* }

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*/

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private static $_resources_by_scope;

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/**

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* @var string

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*/

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public static $WP_CONTENT_DIR;

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/**

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* @var string

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*/

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public static $current_output_location;

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/**

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* @var ET_Core_Data_Utils

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*/

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public static $data_utils;

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/**

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* @var \WP_Filesystem_Base|null

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*/

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public static $wpfs;

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/**

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* The absolute path to the directory where the static resource will be stored.

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*

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* @var string

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*/

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public $BASE_DIR;

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/**

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* The absolute path to the static resource on the server.

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*

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* @var string

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*/

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public $PATH;

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public $TEMP_DIR;

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/**

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* The absolute URL through which the static resource can be downloaded.

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*

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* @var string

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*/

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public $URL;

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/**

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* The data/contents for/of the static resource sorted by priority.

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*

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* @var array

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*/

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public $data;

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/**

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* Whether or not this resource has been disabled.

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*

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* @var bool

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*/

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public $disabled;

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/**

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* Whether or not the static resource file has been enqueued.

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*

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* @var bool

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*/

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public $enqueued;

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/**

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* Whether or not this resource is forced inline.

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*

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* @var bool

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*/

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public $forced_inline;

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/**

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* @var string

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*/

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public $filename;

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/**

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* Whether or not the resource has already been output to the page inline.

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*

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* @var bool

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*/

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public $inlined;

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/**

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* The owner of this instance.

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*

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* @var string

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*/

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public $owner;

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/**

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* The id of the post to which this resource belongs.

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*

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* @var string

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*/

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public $post_id;

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/**

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* The priority of this resource.

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*

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* @var int

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*/

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public $priority;

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/**

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* A unique identifier for this resource.

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*

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* @var string

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*/

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public $slug;

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/**

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* The resource type (style|script).

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*

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* @var string

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*/

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public $type;

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/**

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* The output location during which this resource's static file should be generated.

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*

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* @var string

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*/

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public $write_file_location;

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/**

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* ET_Core_PageResource constructor

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*

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* @param string $owner The owner of the instance (core|divi|builder|bloom|monarch|custom).

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* @param string $slug A string that uniquely identifies the resource.

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* @param string|int $post_id The post id that the resource is associated with or `global`.

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* If `null`, {@link get_the_ID()} will be used.

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* @param string $type The resource type (style|script). Default: `style`.

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* @param string $location Where the resource should be output (head|footer). Default: `head`.

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*/

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public function __construct( $owner, $slug, $post_id = null, $priority = 10, $location = 'head-late', $type = 'style' ) {

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$this->owner = self::_validate_property( 'owner', $owner );

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$this->post_id = self::_validate_property( 'post_id', $post_id ? $post_id : et_core_page_resource_get_the_ID() );

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$this->type = self::_validate_property( 'type', $type );

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$this->location = self::_validate_property( 'location', $location );

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$this->write_file_location = $this->location;

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$this->filename = sanitize_file_name( "et-{$this->owner}-{$slug}-{$post_id}" );

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$this->slug = "{$this->filename}-cached-inline-{$this->type}s";

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$this->data = array();

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$this->priority = $priority;

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self::startup();

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$this->_initialize_resource();

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}

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/**

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* Activates the class

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*/

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public static function startup() {

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if ( null !== self::$_resources ) {

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// Class has already been initialized

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return;

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}

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$time = (string) microtime( true );

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$time = str_replace( '.', '', $time );

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$rand = (string) mt_rand();

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self::$_request_time = $time;

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self::$_request_id = "{$time}-{$rand}";

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self::$_resources = array();

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self::$data_utils = new ET_Core_Data_Utils();

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foreach ( self::$_OUTPUT_LOCATIONS as $location ) {

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self::$_resources_by_location[ $location ] = array();

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}

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foreach( self::$_SCOPES as $scope ) {

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self::$_resources_by_scope[ $scope ] = array();

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}

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self::$WP_CONTENT_DIR = self::$data_utils->normalize_path( WP_CONTENT_DIR );

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self::$_LOCK_FILE = self::$_request_id . '~';

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self::_register_callbacks();

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self::_setup_wp_filesystem();

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self::$_can_write = et_core_cache_dir()->can_write;

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}

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/**

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* Updates our resource array in the database if needed.

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*/

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public static function shutdown() {

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if ( ! self::$_resources || ! self::$_can_write ) {

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return;

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}

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// Remove any leftover temporary directories that belong to this request

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foreach ( self::$_TEMP_DIRS as $temp_directory ) {

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if ( file_exists( $temp_directory . '/' . self::$_LOCK_FILE ) ) {

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@self::$wpfs->delete( $temp_directory, true );

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}

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}

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// Reset $_resources property; Mostly useful for unit test big request which needs to make

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// each test*() method act like it is different page request

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self::$_resources = null;

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if ( et_()->WPFS()->exists( self::$WP_CONTENT_DIR . '/cache/et' ) ) {

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// Remove old cache directory

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et_()->WPFS()->rmdir( self::$WP_CONTENT_DIR . '/cache/et', true );

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}

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}

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protected static function _assign_output_location( $location, $resource ) {

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$priority_existed = isset( self::$_resources_by_location[ $location ][ $resource->priority ] );

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self::$_resources_by_location[ $location ][ $resource->priority ][ $resource->slug ] = $resource;

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if ( ! $priority_existed ) {

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// We've added a new priority to the list, so put them back in sorted order.

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ksort( self::$_resources_by_location[ $location ], SORT_NUMERIC );

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}

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}

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/**

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* Enqueues static file for provided script resource.

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*

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* @param ET_Core_PageResource $resource

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*/

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protected static function _enqueue_script( $resource ) {

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$can_enqueue = 0 === did_action( 'wp_print_scripts' );

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if ( $can_enqueue ) {

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wp_enqueue_script( $resource->slug, set_url_scheme( $resource->URL ), array(), ET_CORE_VERSION, true );

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} else {

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printf(

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'<script id="%1$s" src="%2$s"></script>', // phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedScript

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esc_attr( $resource->slug ),

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esc_url( set_url_scheme( $resource->URL ) )

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);

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}

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$resource->enqueued = true;

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}

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/**

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* Enqueues static file for provided style resource.

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*

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* @param ET_Core_PageResource $resource

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*/

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protected static function _enqueue_style( $resource ) {

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if ( 'footer' === self::$current_output_location ) {

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return;

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}

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$can_enqueue = 0 === did_action( 'wp_print_styles' );

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if ( $can_enqueue ) {

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wp_enqueue_style( $resource->slug, set_url_scheme( $resource->URL ) );

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} else {

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printf(

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'<link rel="stylesheet" id="%1$s" href="%2$s" onerror="%3$s" onload="%4$s" />', // phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedStylesheet

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esc_attr( $resource->slug ),

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esc_url( set_url_scheme( $resource->URL ) ),

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et_core_esc_previously( self::$_onerror ),

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et_core_esc_previously( self::$_onload )

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);

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}

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$resource->enqueued = true;

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}

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/**

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* Returns the next output location.

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*

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* @see self::$_OUTPUT_LOCATIONS

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*

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* @return string

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*/

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protected static function _get_next_output_location() {

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$current_index = array_search( self::$current_output_location, self::$_OUTPUT_LOCATIONS );

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if ( false === $current_index || ! is_int( $current_index ) ) {

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ET_Core_Logger::error( '$current_output_location is invalid!' );

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}

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$current_index += 1;

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return self::$_OUTPUT_LOCATIONS[ $current_index ];

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}

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/**

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* Creates static resource files for an output location if needed.

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*

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* @param string $location {@link self::$_OUTPUT_LOCATIONS}

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*/

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protected static function _maybe_create_static_resources( $location ) {

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self::$current_output_location = $location;

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$sorted_resources = self::get_resources_by_output_location( $location );

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foreach ( $sorted_resources as $priority => $resources ) {

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foreach ( $resources as $slug => $resource ) {

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if ( $resource->write_file_location !== $location ) {

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// This resource's static file needs to be generated later on.

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self::_assign_output_location( $resource->write_file_location, $resource );

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continue;

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}

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if ( ! self::$_can_write ) {

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// The reason we don't simply check this before looping through resources and

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// bail if it fails is because we need to perform the output location assignment

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// in the previous conditional regardless (otherwise builder styles will break).

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continue;

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}

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if ( $resource->forced_inline || $resource->has_file() ) {

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continue;

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}

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$data = $resource->get_data( 'file' );

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if ( empty( $data ) && 'footer' !== $location ) {

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// This resource doesn't have any data yet so we'll assign it to the next output location.

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$next_location = self::_get_next_output_location();

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$resource->set_output_location( $next_location );

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continue;

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}

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if ( empty( $data ) ) {

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continue;

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}

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// Make sure directory exists.

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if ( ! self::$data_utils->ensure_directory_exists( $resource->BASE_DIR ) ) {

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self::$_can_write = false;

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return;

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}

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$can_continue = true;

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// Try to create a temporary directory which we'll use as a pseudo file lock

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if ( @mkdir( $resource->TEMP_DIR, 0755 ) ) {

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self::$_TEMP_DIRS[] = $resource->TEMP_DIR;

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// Make sure another request doesn't delete our temp directory

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$lock_file = $resource->TEMP_DIR . '/' . self::$_LOCK_FILE;

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self::$wpfs->put_contents( $lock_file, '' );

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// Create the static resource file

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if ( ! self::$wpfs->put_contents( $resource->PATH, $data, 0644 ) ) {

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// There's no point in continuing

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self::$_can_write = $can_continue = false;

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} else {

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// Remove the temporary directory

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self::$wpfs->delete( $resource->TEMP_DIR, true );

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}

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} else if ( file_exists( $resource->TEMP_DIR ) ) {

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// The static resource file is currently being created by another request

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