grunt-mangony/test/fixtures/helpers/helper-xif.js

Grunt wrapper for Mangony, another static site generator - fast, simple and powerful.

(function () {
	module.exports.register = function (Handlebars, options) {
		/* a helper to execute an IF statement with any expression
		 USAGE:
		 -- Yes you NEED to properly escape the string literals, or just alternate single and double quotes
		 -- to access any global function or property you should use window.functionName() instead of just functionName()
		 -- this example assumes you passed this context to your handlebars template( {name: 'Sam', age: '20' } ), notice age is a string, just for so I can demo parseInt later
		 <p>
		 {{#xif " this.name == 'Sam' && this.age === '12' " }}
		 BOOM
		 {{else}}
		 BAAM
		 {{/xif}}
		 </p>
		 */

		Handlebars.registerHelper("xif", function (expression, options) {
			return Handlebars.helpers["x"].apply(this, [expression, options]) ? options.fn(this) : options.inverse(this);
		});

		/* a helper to execute javascript expressions
		 USAGE:
		 -- Yes you NEED to properly escape the string literals or just alternate single and double quotes
		 -- to access any global function or property you should use window.functionName() instead of just functionName(), notice how I had to use window.parseInt() instead of parseInt()
		 -- this example assumes you passed this context to your handlebars template( {name: 'Sam', age: '20' } )
		 <p>Url: {{x " \"hi\" + this.name + \", \" + window.location.href + \" <---- this is your href,\" + " your Age is:" + window.parseInt(this.age, 10) "}}</p>
		 OUTPUT:
		 <p>Url: hi Sam, http://example.com <---- this is your href, your Age is: 20</p>
		 */

		Handlebars.registerHelper("x", function (expression, options) {
			var fn = function(){}, result;
			try {
				fn = Function.apply(this,["module", "return " + expression + " ;"]);
			} catch (e) {
				console.warn("{{x " + expression + "}} has invalid javascript", e);
			}

			try {
				result = fn.bind(this)(module);
			} catch (e) {
				console.warn("{{x " + expression + "}} hit a runtime error", e);
			}
			return result;
		});
	};
}).call(this);