/**

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* @output wp-includes/js/wp-util.js

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*/

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/* global _wpUtilSettings */

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/** @namespace wp */

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window.wp = window.wp || {};

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(function ($) {

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// Check for the utility settings.

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var settings = typeof _wpUtilSettings === 'undefined' ? {} : _wpUtilSettings;

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/**

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* wp.template( id )

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*

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* Fetch a JavaScript template for an id, and return a templating function for it.

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*

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* @param {string} id A string that corresponds to a DOM element with an id prefixed with "tmpl-".

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* For example, "attachment" maps to "tmpl-attachment".

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* @return {function} A function that lazily-compiles the template requested.

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*/

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wp.template = _.memoize(function ( id ) {

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var compiled,

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/*

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* Underscore's default ERB-style templates are incompatible with PHP

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* when asp_tags is enabled, so WordPress uses Mustache-inspired templating syntax.

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*

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* @see trac ticket #22344.

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*/

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options = {

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evaluate: /<#([\s\S]+?)#>/g,

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interpolate: /\{\{\{([\s\S]+?)\}\}\}/g,

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escape: /\{\{([^\}]+?)\}\}(?!\})/g,

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variable: 'data'

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};

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return function ( data ) {

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if ( ! document.getElementById( 'tmpl-' + id ) ) {

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throw new Error( 'Template not found: ' + '#tmpl-' + id );

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}

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compiled = compiled || _.template( $( '#tmpl-' + id ).html(), options );

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return compiled( data );

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};

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});

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/*

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* wp.ajax

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* ------

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*

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* Tools for sending ajax requests with JSON responses and built in error handling.

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* Mirrors and wraps jQuery's ajax APIs.

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*/

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wp.ajax = {

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settings: settings.ajax || {},

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/**

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* wp.ajax.post( [action], [data] )

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*

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* Sends a POST request to WordPress.

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*

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* @param {(string|Object)} action The slug of the action to fire in WordPress or options passed

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* to jQuery.ajax.

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* @param {Object=} data Optional. The data to populate $_POST with.

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* @return {$.promise} A jQuery promise that represents the request,

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* decorated with an abort() method.

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*/

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post: function( action, data ) {

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return wp.ajax.send({

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data: _.isObject( action ) ? action : _.extend( data || {}, { action: action })

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});

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},

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/**

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* wp.ajax.send( [action], [options] )

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*

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* Sends a POST request to WordPress.

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*

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* @param {(string|Object)} action The slug of the action to fire in WordPress or options passed

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* to jQuery.ajax.

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* @param {Object=} options Optional. The options passed to jQuery.ajax.

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* @return {$.promise} A jQuery promise that represents the request,

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* decorated with an abort() method.

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*/

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send: function( action, options ) {

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var promise, deferred;

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if ( _.isObject( action ) ) {

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options = action;

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} else {

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options = options || {};

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options.data = _.extend( options.data || {}, { action: action });

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}

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options = _.defaults( options || {}, {

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type: 'POST',

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url: wp.ajax.settings.url,

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context: this

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});

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deferred = $.Deferred( function( deferred ) {

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// Transfer success/error callbacks.

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if ( options.success ) {

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deferred.done( options.success );

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}

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if ( options.error ) {

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deferred.fail( options.error );

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}

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delete options.success;

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delete options.error;

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// Use with PHP's wp_send_json_success() and wp_send_json_error().

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deferred.jqXHR = $.ajax( options ).done( function( response ) {

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// Treat a response of 1 as successful for backward compatibility with existing handlers.

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if ( response === '1' || response === 1 ) {

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response = { success: true };

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}

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if ( _.isObject( response ) && ! _.isUndefined( response.success ) ) {

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// When handling a media attachments request, get the total attachments from response headers.

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var context = this;

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deferred.done( function() {

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if (

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action &&

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action.data &&

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'query-attachments' === action.data.action &&

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deferred.jqXHR.hasOwnProperty( 'getResponseHeader' ) &&

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deferred.jqXHR.getResponseHeader( 'X-WP-Total' )

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) {

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context.totalAttachments = parseInt( deferred.jqXHR.getResponseHeader( 'X-WP-Total' ), 10 );

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} else {

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context.totalAttachments = 0;

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}

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} );

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deferred[ response.success ? 'resolveWith' : 'rejectWith' ]( this, [response.data] );

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} else {

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deferred.rejectWith( this, [response] );

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}

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}).fail( function() {

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deferred.rejectWith( this, arguments );

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});

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});

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promise = deferred.promise();

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promise.abort = function() {

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deferred.jqXHR.abort();

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return this;

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};

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return promise;

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}

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};

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}(jQuery));

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