raycmorgan · January 14, 2010 07:58
diff --git a/Mu.js b/Mu.js
 var sys = require('sys');
 var template ="<html>" +
                "<body>" +
                  "<h1>{{ title }}</h1>" +
                  "{{# admin }}" +
                    "If admin {{ name }}" +
                  "{{/ admin }}" +
                "</body>" +
              "</html>";

 Mu = {
  escape: function (val) {
    return val.replace(/</, '&lt;');
  },
  
  normalize: function (val) {
    return val ? val.toString() : '';
  },
  
  enumerable: function (env, val, fn) {
    if (typeof(val) === 'undefined') {
      return '';
    }
    
    if (typeof(val) === 'boolean') {
      return val ? fn(env) : '';
    }
    
    if (val instanceof Array) {
      var result = '';
      for (var i = 0, len = val.length; i < val.length; i++) {
        result += fn(val[i]);
      }
      return result;
      
      // return val.map(fn).join(''); // One can dreamm.. about 40% slower
    }
    
    return val ? fn(val) : '';
  }
 };


 function compilePart(source, begin, end) {
  begin = begin || '{{';
  end = end || '}}';
  
  var code = [];
  var buffer = '';
  
  var rbegin = new RegExp(begin + '$');
  var rend = new RegExp(end + '$');
  
  for (var i = 0, len = source.length; i < source.length; i++) {
    var letter = source.charAt(i);
    
    buffer += letter;
    
    if (buffer.match(rbegin)) {
      
      if (buffer.length > begin.length) {
        buffer = buffer.substring(0, buffer.length - end.length);
        code.push('result += "' + buffer + '";');
      }
      
      buffer = '';
      
      (function inTag() {
        i++;
        var buffer = '';
        
        for (; i < source.length; i++) {
          var letter = source.charAt(i);
          
          if (letter === ' ') {
            continue;
          }
          
          if (letter === '#' && buffer === '') {
            
            (function inEnumerableTag() {
              i++;
              var buffer = '';
              
              for (; i < source.length; i++) {
                var letter = source.charAt(i);

                if (letter === ' ') {
                  continue;
                }
                
                buffer += letter;
                
                if (buffer.match(rend)) {
                  buffer = buffer.substring(0, buffer.length - end.length);
                  
                  (function inEnumerable(varName) {
                    i++;
                    var buffer = '';
                    var regexp = new RegExp('(.*){{ */ *' + varName + ' *}}$');
                    
                    for (; i < source.length; i++) {
                      var letter = source.charAt(i);
                      
                      buffer += letter;
                      
                      var match = buffer.match(regexp);
                      if (match) {
                        code.push(
                          'result += Mu.enumerable(env, env.' + varName + ', function (env) {',
                            'var result = "";',
                            compilePart(match[1], begin, end),
                            'return result;',
                          '});'
                        );
                        return;
                      }
                    }
                    
                    throw "Unexpected End";
                    
                  })(buffer);
                  
                  return;
                }
              }
            })();
            
            return;
          }
          
          buffer += letter;
          
          if (buffer.match(rend)) {
            buffer = buffer.substring(0, buffer.length - end.length);
            code.push("result += Mu.escape(Mu.normalize(env." + buffer + "));");
            return;
          }
        }
        
        throw "Unexpected End";
      })();
      
      continue;
    }
  }
  
  if (buffer) {
    code.push('result += "' + buffer + '";');
  }
    
  return code.join('');
 }

 function compile(source) {
  source = compilePart(source);
  
  return 'function (env) {\n' +
           'var result = "";\n' +
           source +
           'return result;\n' +
         '\n}';
 }

 var compiled = compile(template);
 compiled = eval("(" + compiled + ")");

 sys.puts(
  compiled(
    {
      title: "Hello World", 
      admin: [
        {name: "tom"},
        {name: "jim"}
      ]
    }
  )
 );

 var d = new Date();
 for (var i = 0; i < 1000000; i++) {
  compiled(
    {
      title: "Hello World", 
      admin: [
        {name: "tom"},
        {name: "jim"}
      ]
    }
  )
 }
 sys.puts("Time taken: " + ((new Date() - d) / 1000) + "secs");
	var sys = require('sys');
	var template ="<html>" +
	"<body>" +
	"<h1>{{ title }}</h1>" +
	"{{# admin }}" +
	"If admin {{ name }}" +
	"{{/ admin }}" +
	"</body>" +
	"</html>";

	Mu = {
	escape: function (val) {
	return val.replace(/</, '<');
	},

	normalize: function (val) {
	return val ? val.toString() : '';
	},

	enumerable: function (env, val, fn) {
	if (typeof(val) === 'undefined') {
	return '';
	}

	if (typeof(val) === 'boolean') {
	return val ? fn(env) : '';
	}

	if (val instanceof Array) {
	var result = '';
	for (var i = 0, len = val.length; i < val.length; i++) {
	result += fn(val[i]);
	}
	return result;

	// return val.map(fn).join(''); // One can dreamm.. about 40% slower
	}

	return val ? fn(val) : '';
	}
	};


	function compilePart(source, begin, end) {
	begin = begin \|\| '{{';
	end = end \|\| '}}';

	var code = [];
	var buffer = '';

	var rbegin = new RegExp(begin + '$');
	var rend = new RegExp(end + '$');

	for (var i = 0, len = source.length; i < source.length; i++) {
	var letter = source.charAt(i);

	buffer += letter;

	if (buffer.match(rbegin)) {

	if (buffer.length > begin.length) {
	buffer = buffer.substring(0, buffer.length - end.length);
	code.push('result += "' + buffer + '";');
	}

	buffer = '';

	(function inTag() {
	i++;
	var buffer = '';

	for (; i < source.length; i++) {
	var letter = source.charAt(i);

	if (letter === ' ') {
	continue;
	}

	if (letter === '#' && buffer === '') {

	(function inEnumerableTag() {
	i++;
	var buffer = '';

	for (; i < source.length; i++) {
	var letter = source.charAt(i);

	if (letter === ' ') {
	continue;
	}

	buffer += letter;

	if (buffer.match(rend)) {
	buffer = buffer.substring(0, buffer.length - end.length);

	(function inEnumerable(varName) {
	i++;
	var buffer = '';
	var regexp = new RegExp('(.){{ / ' + varName + ' }}$');

	for (; i < source.length; i++) {
	var letter = source.charAt(i);

	buffer += letter;

	var match = buffer.match(regexp);
	if (match) {
	code.push(
	'result += Mu.enumerable(env, env.' + varName + ', function (env) {',
	'var result = "";',
	compilePart(match[1], begin, end),
	'return result;',
	'});'
	);
	return;
	}
	}

	throw "Unexpected End";

	})(buffer);

	return;
	}
	}
	})();

	return;
	}

	buffer += letter;

	if (buffer.match(rend)) {
	buffer = buffer.substring(0, buffer.length - end.length);
	code.push("result += Mu.escape(Mu.normalize(env." + buffer + "));");
	return;
	}
	}

	throw "Unexpected End";
	})();

	continue;
	}
	}

	if (buffer) {
	code.push('result += "' + buffer + '";');
	}

	return code.join('');
	}

	function compile(source) {
	source = compilePart(source);

	return 'function (env) {\n' +
	'var result = "";\n' +
	source +
	'return result;\n' +
	'\n}';
	}

	var compiled = compile(template);
	compiled = eval("(" + compiled + ")");

	sys.puts(
	compiled(
	{
	title: "Hello World",
	admin: [
	{name: "tom"},
	{name: "jim"}
	]
	}
	)
	);

	var d = new Date();
	for (var i = 0; i < 1000000; i++) {
	compiled(
	{
	title: "Hello World",
	admin: [
	{name: "tom"},
	{name: "jim"}
	]
	}
	)
	}
	sys.puts("Time taken: " + ((new Date() - d) / 1000) + "secs");