/**

 * @license Copyright (c) 2003-2013, CKSource - Frederico Knabben. All rights reserved.

 * For licensing, see LICENSE.md or http://ckeditor.com/license

 */



/**

 * @fileOverview Defines the {@link CKEDITOR.template} class, which represents

 * an UI template for an editor instance.

 */



(function() {

	var cache = {};



	/**

	 * Lightweight template used to build the output string from variables.

	 *

	 *		// HTML template for presenting a label UI.

	 *		var tpl = new CKEDITOR.template( '<div class="{cls}">{label}</div>' );

	 *		alert( tpl.output( { cls: 'cke-label', label: 'foo'} ) ); // '<div class="cke-label">foo</div>'

	 *

	 * @class

	 * @constructor Creates a template class instance.

	 * @param {String} source The template source.

	 */

	CKEDITOR.template = function( source ) {

		// Builds an optimized function body for the output() method, focused on performance.

		// For example, if we have this "source":

		//	'<div style="{style}">{editorName}</div>'

		// ... the resulting function body will be (apart from the "buffer" handling):

		//	return [ '<div style="', data['style'] == undefined ? '{style}' : data['style'], '">', data['editorName'] == undefined ? '{editorName}' : data['editorName'], '</div>' ].join('');



		// Try to read from the cache.

		if ( cache[ source ] )

			this.output = cache[ source ];

		else {

			var fn = source

			// Escape all quotation marks (").

			.replace( /'/g, "\\'" )

			// Inject the template keys replacement.

			.replace( /{([^}]+)}/g, function( m, key ) {

				return "',data['" + key + "']==undefined?'{" + key + "}':data['" + key + "'],'";

			});



			fn = "return buffer?buffer.push('" + fn + "'):['" + fn + "'].join('');";

			this.output = cache[ source ] = Function( 'data', 'buffer', fn );

		}

	};

})();



/**

 * Processes the template, filling its variables with the provided data.

 *

 * @method output

 * @param {Object} data An object containing properties which values will be

 * used to fill the template variables. The property names must match the

 * template variables names. Variables without matching properties will be

 * kept untouched.

 * @param {Array} [buffer] An array into which the output data will be pushed into.

 * The number of entries appended to the array is unknown.

 * @returns {String/Number} If `buffer` has not been provided, the processed

 * template output data, otherwise the new length of `buffer`.

 */