template-engine.js

// http://krasimirtsonev.com/blog/article/Javascript-template-engine-in-just-20-line

(function(window) {
    
    "use strict";

    const template = function(html, options) {
        var re = /<%([^%>]+)?%>/g, reExp = /(^( )?(if|for|else|switch|case|break|{|}))(.*)?/g, code = 'var r=[];\n', cursor = 0, match;
        var add = function(line, js) {
            js? (code += line.match(reExp) ? line + '\n' : 'r.push(' + line + ');\n') :
                (code += line != '' ? 'r.push("' + line.replace(/"/g, '\\"') + '");\n' : '');
            return add;
        }
        while(match = re.exec(html)) {
            add(html.slice(cursor, match.index))(match[1], true);
            cursor = match.index + match[0].length;
        }
        add(html.substr(cursor, html.length - cursor));
        code += 'return r.join("");';
        return new Function(code.replace(/[\r\t\n]/g, '')).apply(options);
    };

    if (typeof define === "function" && define.amd) {
    	// AMD
    	define(template);
    } else {
    	// browser global
    	window.template = template;
    }
})(window);