CodeMirror.defineMode("less", function(config) {
  var indentUnit = config.indentUnit, type;
  function ret(style, tp) {type = tp; return style;}
  //html5 tags
  var tags = ["a","abbr","acronym","address","applet","area","article","aside","audio","b","base","basefont","bdi","bdo","big","blockquote","body","br","button","canvas","caption","cite","code","col","colgroup","command","datalist","dd","del","details","dfn","dir","div","dl","dt","em","embed","fieldset","figcaption","figure","font","footer","form","frame","frameset","h1","h2","h3","h4","h5","h6","head","header","hgroup","hr","html","i","iframe","img","input","ins","keygen","kbd","label","legend","li","link","map","mark","menu","meta","meter","nav","noframes","noscript","object","ol","optgroup","option","output","p","param","pre","progress","q","rp","rt","ruby","s","samp","script","section","select","small","source","span","strike","strong","style","sub","summary","sup","table","tbody","td","textarea","tfoot","th","thead","time","title","tr","track","tt","u","ul","var","video","wbr"];
  
  function inTagsArray(val){
    for(var i=0; i<tags.length; i++){
      if(val === tags[i]){
	return true;
      }
    }
  }

  function tokenBase(stream, state) {
    var ch = stream.next();

    if (ch == "@") {stream.eatWhile(/[\w\-]/); return ret("meta", stream.current());}
    else if (ch == "/" && stream.eat("*")) {
      state.tokenize = tokenCComment;
      return tokenCComment(stream, state);
    }
    else if (ch == "<" && stream.eat("!")) {
      state.tokenize = tokenSGMLComment;
      return tokenSGMLComment(stream, state);
    }
    else if (ch == "=") ret(null, "compare");
    else if ((ch == "~" || ch == "|") && stream.eat("=")) return ret(null, "compare");
    else if (ch == "\"" || ch == "'") {
      state.tokenize = tokenString(ch);
      return state.tokenize(stream, state);
    }
    else if (ch == "/") { // lesscss e.g.: .png will not be parsed as a class
      if(stream.eat("/")){
	state.tokenize = tokenSComment
      	return tokenSComment(stream, state);
      }else{
	stream.eatWhile(/[\a-zA-Z0-9\-_.]/);
	if(stream.peek() == ")" || stream.peek() == "/")return ret("string", "string");//let url(/images/logo.png) without quotes return as string
        return ret("number", "unit");
      }
    }
    else if (ch == "!") {
      stream.match(/^\s*\w*/);
      return ret("keyword", "important");
    }
    else if (/\d/.test(ch)) {
      stream.eatWhile(/[\w.%]/);
      return ret("number", "unit");
    }
    else if (/[,+>*\/]/.test(ch)) {//removed . dot character original was [,.+>*\/]
      return ret(null, "select-op");
    }
    else if (/[;{}:\[\]()]/.test(ch)) { //added () char for lesscss original was [;{}:\[\]]
      if(ch == ":"){
	stream.eatWhile(/[active|hover|link|visited]/);
	if( stream.current().match(/active|hover|link|visited/)){
	  return ret("tag", "tag");
	}else{
	  return ret(null, ch);	
	}
      }else{
  	return ret(null, ch);
      }
    }
    else if (ch == ".") { // lesscss
      stream.eatWhile(/[\a-zA-Z0-9\-_]/);
      return ret("tag", "tag");
    }
    else if (ch == "#") { // lesscss
      stream.match(/([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/);
      if(stream.current().length >1){
	if(stream.current().match(/([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/) != null){
	  return ret("number", "unit");
	}else{
	  stream.eatWhile(/[\w\-]/);
	  return ret("atom", "tag"); 
	}
      }else{
	stream.eatWhile(/[\w\-]/);
	return ret("atom", "tag");
      }
    }
    else if (ch == "&") {
      stream.eatWhile(/[\w\-]/);
      return ret(null, ch);
    }
    else {
      stream.eatWhile(/[\w\\\-_.%]/);
      if( stream.eat("(") ){ // lesscss
	return ret(null, ch);
      }else if( stream.current().match(/\-\d|\-.\d/) ){ // lesscss match e.g.: -5px -0.4 etc...
	return ret("number", "unit");
      }else if( inTagsArray(stream.current()) ){ // lesscss match html tags
	return ret("tag", "tag");
      }else if( (stream.peek() == ")" || stream.peek() == "/") && stream.current().indexOf('.') !== -1){
	return ret("string", "string");//let url(logo.png) without quotes and froward slash return as string
      }else{
      	return ret("variable", "variable");
      }
    }
    
  }

  function tokenSComment(stream, state) {// SComment = Slash comment
    stream.skipToEnd();
    state.tokenize = tokenBase;
    return ret("comment", "comment");
  }
  
  function tokenCComment(stream, state) {
    var maybeEnd = false, ch;
    while ((ch = stream.next()) != null) {
      if (maybeEnd && ch == "/") {
        state.tokenize = tokenBase;
        break;
      }
      maybeEnd = (ch == "*");
    }
    return ret("comment", "comment");
  }

  function tokenSGMLComment(stream, state) {
    var dashes = 0, ch;
    while ((ch = stream.next()) != null) {
      if (dashes >= 2 && ch == ">") {
        state.tokenize = tokenBase;
        break;
      }
      dashes = (ch == "-") ? dashes + 1 : 0;
    }
    return ret("comment", "comment");
  }

  function tokenString(quote) {
    return function(stream, state) {
      var escaped = false, ch;
      while ((ch = stream.next()) != null) {
        if (ch == quote && !escaped)
          break;
        escaped = !escaped && ch == "\\";
      }
      if (!escaped) state.tokenize = tokenBase;
      return ret("string", "string");
    };
  }

  return {
    startState: function(base) {
      return {tokenize: tokenBase,
              baseIndent: base || 0,
              stack: []};
    },

    token: function(stream, state) {
      if (stream.eatSpace()) return null;
      var style = state.tokenize(stream, state);

      var context = state.stack[state.stack.length-1];
      if (type == "hash" && context == "rule") style = "atom";
      else if (style == "variable") {
        if (context == "rule") style = null; //"tag"
        else if (!context || context == "@media{") style = "tag";
      }

      if (context == "rule" && /^[\{\};]$/.test(type))
        state.stack.pop();
      if (type == "{") {
        if (context == "@media") state.stack[state.stack.length-1] = "@media{";
        else state.stack.push("{");
      }
      else if (type == "}") state.stack.pop();
      else if (type == "@media") state.stack.push("@media");
      else if (context == "{" && type != "comment") state.stack.push("rule");
      return style;
    },

    indent: function(state, textAfter) {
      var n = state.stack.length;
      if (/^\}/.test(textAfter))
        n -= state.stack[state.stack.length-1] == "rule" ? 2 : 1;
      return state.baseIndent + n * indentUnit;
    },

    electricChars: "}"
  };
});

CodeMirror.defineMIME("text/less", "less");