templatejs.js

templatejs.js

// TemplateJS v3.1.1 MIT/GPL2 @jon_neal
(function (global) {
	function escapeJS (str) {
		return str.replace(/"/g, '\\"').replace(/\n/g, '\\n').replace(/\r/g, '\\r');
	}

	function TemplateWalk (instance, str) {
		// check for the opening and closer strings
		var indexOpener = str.indexOf(instance.chars.open);
		var indexCloser = str.indexOf(instance.chars.close);

		// init our array buffer
		var buffer = [];

		// if the opening string is encountered
		if (indexOpener > -1 && indexOpener < indexCloser) {
			buffer.push(instance.chars.buffer + '.push("' + escapeJS(str.substr(0, indexOpener)) + '")');
			buffer.push(TemplateWalk(instance, str.substr(indexOpener + instance.chars.open.length)));
		}
		// if the closing string is encountered
		else if (indexCloser > -1) {
			var firstChar = str.substr(0, 1);

			if (instance.helpers[firstChar]) {
				buffer.push(instance.helpers[firstChar](str.substr(1, indexCloser - 1)));
				buffer.push(TemplateWalk(instance, str.substr(indexCloser + instance.chars.close.length)));
			} else {
				buffer.push(str.substr(0, indexCloser));
				buffer.push(TemplateWalk(instance, str.substr(indexCloser + instance.chars.close.length)));
			}
		}
		// if a regular string encountered
		else {
			buffer.push(instance.chars.buffer + '.push("' + escapeJS(str) + '")');
		}

		return buffer.join(';');
	}

	function Template () {
		var instance = this, compiled;

		instance.chars = {
			'open': '<%',
			'close': '%>',
			'buffer': '__out__',
			'property': '__property__'
		};

		instance.helpers = {
			'=': function (js) {
				return instance.chars.buffer + '.push(' + js + ')';
			},
			'?': function (js) {
				return 'if(true){if((' + js + ')){';
			},
			'!': function (js) {
				return 'if(true){if(!(' + js + ')){';
			},
			'#': function (js) {
				return 'for(var ' + instance.chars.property + ' in ' + js + '){with(' + js + '[' + instance.chars.property + ']){';
			},
			'@': function (js) {
				return 'if(true){with(' + js + '){';
			},
			'/': function (js) {
				return '}}';
			}
		};

		instance.data = {
			source: '',
			scope: {},
			render: function() {}
		};

		return this;
	}

	Template.prototype.source = function (val) {
		this.data.source = String(val);
		this.data.render = Function(this.chars.buffer + '=[];with(this){' + TemplateWalk(this, this.data.source) + '}return ' + this.chars.buffer + '.join("")');
	};

	Template.prototype.scope = function (val) {
		this.data.scope = val;
	};

	Template.prototype.render = function () {
		return this.data.render.call(this.data.scope);
	};

	global.Template = Template;
})(this);