diff --git a/mode/less/index.html b/mode/less/index.html
new file mode 100644
index 0000000000000000000000000000000000000000..1e47118f25f6965b2a02504282aa37519654892e
--- /dev/null
+++ b/mode/less/index.html
@@ -0,0 +1,95 @@
+<!DOCTYPE HTML>
+<html lang="en">
+<head>
+ <meta charset="UTF-8">
+ <title>less CodeMirror2 Syntax</title>
+
+ <link rel="stylesheet" href="../../lib/codemirror.css">
+ <script src="../../lib/codemirror.js"></script>
+ <link rel="stylesheet" href="../../theme/default.css">
+ <script src="less.js"></script>
+
+ <style type="text/css">
+ form {
+ border: 1px solid #222;
+ font-size: 18px;
+ }
+
+ .CodeMirror-scroll {
+ height: 600px;
+ }
+ </style>
+
+</head>
+<body>
+
+ <form>
+<textarea name="code" id="code">
+//
+// Examples taken from http://lesscss.org
+//
+
+color: #4D926F;
+
+#header {
+ color: @color;
+}
+h2 {
+ color: @color;
+}
+
+.rounded-corners (@radius: 5px) {
+ border-radius: @radius;
+ -webkit-border-radius: @radius;
+ -moz-border-radius: @radius;
+}
+
+#header {
+ .rounded-corners;
+}
+#footer {
+ .rounded-corners(10px);
+}
+
+#header {
+ h1 {
+ font-size: 26px;
+ font-weight: bold;
+ }
+ p { font-size: 12px;
+ a { text-decoration: none;
+ &:hover { border-width: 1px }
+ }
+ }
+}
+
+@the-border: 1px;
+@base-color: #111;
+@red: #842210;
+
+#header {
+ color: @base-color * 3;
+ border-left: @the-border;
+ border-right: @the-border * 2;
+}
+#footer {
+ color: @base-color + #003300;
+ border-color: desaturate(@red, 10%);
+}
+
+
+
+
+</textarea>
+ </form>
+
+ <script type="text/javascript">
+ var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
+ tabMode: "shift",
+ lineNumbers: true
+ });
+ </script>
+
+
+</body>
+</html>
diff --git a/mode/less/less.js b/mode/less/less.js
new file mode 100644
index 0000000000000000000000000000000000000000..5653370fd540b4a04e92225fe193764d510e9490
--- /dev/null
+++ b/mode/less/less.js
@@ -0,0 +1,250 @@
+// This mode is from the lessphp homepage: https://github.com/leafo/lessphp-site/blob/master/www/codemirror2/mode/less/less.js
+// Author: leaf corcoran <leafot@gmail.com>
+
+// todo make interpolations highlight as typed
+// treat url() as string
+
+CodeMirror.defineMode('less', function(conf) {
+
+ function regex_escape(text) {
+ return text.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
+ }
+
+ function words(words) {
+ var escaped = [];
+ for (var i = 0; i < words.length; i++) {
+ escaped.push(regex_escape(words[i]));
+ }
+ return new RegExp("^(?:" + escaped.join("|") + ")$", "i");
+ }
+
+ function set(items) {
+ var set = {};
+ for (var i = 0; i < items.length; i++) {
+ set[items[i]] = true;
+ }
+ return set;
+ }
+
+ var symbols = set(['{', '}', '[', ']', '(', ')']);
+ var symbols_2 = set(['!', '&']);
+
+ var units = [
+ 'em', 'ex', 'px', 'gd', 'rem', 'vw', 'vh', 'vm', 'ch', 'in', 'cm', 'mm',
+ 'pt', 'pc', '%', 'deg', 'grad', 'rad', 'turn', 'ms', 's', 'Hz', 'kHz',
+ ];
+
+ for (var i = 0; i < units.length; i++)
+ units[i] = regex_escape(units[i]);
+ var unit_regex = new RegExp("^(?:" + units.join('|') + ")");
+
+ var atom = /^[a-z_-][\w_-]*/i;
+ var number = /^(?:\+|\-)?\d(\.\d+)?/i;
+ var color = /^(?:[a-f0-9]{6}|[a-f0-9]{3})/i;
+
+ var html_tags = words([
+ 'abbr', 'acronym', 'address', 'applet', 'area', 'a', 'b', 'base',
+ 'basefont', 'bdo', 'big', 'blockquote', 'body', 'br', 'button', 'caption',
+ 'center', 'cite', 'code', 'col', 'colgroup', 'dd', 'del', 'dfn', 'dir',
+ 'div', 'dl', 'dt', 'em', 'fieldset', 'font', 'form', 'frame', 'frameset',
+ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'hr', 'html', 'img', 'i',
+ 'iframe', 'img', 'input', 'ins', 'isindex', 'kbd', 'label', 'legend', 'li',
+ 'link', 'map', 'menu', 'meta', 'noframes', 'noscript', 'ol', 'optgroup',
+ 'option', 'p', 'param', 'pre', 'q', 's', 'samp', 'script', 'select',
+ 'small', 'span', 'strike', 'strong', 'style', 'sub', 'sup', 'tbody', 'td',
+ 'textarea', 'tfoot', 'th', 'thead', 'title', 'tr', 'tt', 'ul', 'u', 'var'
+ ]);
+
+ var colors = words([
+ "aqua", "black", "blue", "fuchsia", "gray", "green", "lime", "maroon",
+ "navy", "olive", "purple", "red", "silver", "teal", "yellow", "white",
+ "transparent"
+ ]);
+
+ var value_words = words( [
+ "cursive", "fantasy", "monospace", "italic", "oblique", "bold", "bolder",
+ "lighter", "larger", "smaller", "icon", "menu", "caption", "large", "smaller",
+ "larger", "narrower", "wider", "auto", "none", "inherit", "top", "bottom",
+ "medium", "normal", "sans", "sans-serif", "large", "small", "x-large",
+ "x-small", "xx-large", "xx-small", "repeat-x", "repeat-y", "repeat",
+ "no-repeat", "underline", "overline", "blink", "sub", "super", "middle",
+ "capitalize", "uppercase", "lowercase", "center", "justify", "baseline", "sub",
+ "super", "width", "height", "float", "clear", "overflow", "clip", "visibility",
+ "thin", "thick", "both", "dotted", "dashed", "solid", "double", "groove",
+ "ridge", "inset", "outset", "hidden", "visible", "scroll", "collapse", "fixed",
+ "default", "crosshair", "pointer", "move", "wait", "help", "thin", "thick",
+ "dotted", "dashed", "solid", "double", "groove", "ridge", "inset", "outset",
+ "invert", "inline"
+ ]);
+
+ function normal(stream) {
+ var ch = stream.next();
+
+ if (ch == "." && stream.match(atom)) {
+ return "atom";
+ } else if (ch == "#" && stream.match(atom)) {
+ return "tag";
+ } else if (ch == "@" && stream.match(atom)) {
+
+ if (stream.match(/^\s*:/)) {
+ stream.backUp(1);
+ this.push_scanner(value);
+ }
+
+ return "variable-3"
+ } else if (symbols[ch]) {
+ if (ch == "{") this.brace_depth++;
+
+ if (ch == "}") {
+ this.brace_depth--;
+ if (this.brace_depth < 0) return "error";
+ }
+
+ return "bracket";
+ } else if (ch.match(/[a-z]/i)) {
+ stream.backUp(1);
+ stream.match(atom);
+ var word = stream.current();
+ if (stream.match(/^\s*:/)) {
+ stream.backUp(1);
+
+ this.push_scanner(value);
+ return "attribute";
+ }
+
+ if (word.match(html_tags)) {
+ return "tag";
+ }
+ }
+
+ return this.common_value(ch, stream);
+ }
+
+ function common_value(ch, stream) {
+ if (ch == "+" || ch == "-" || ch.match(/\d/)) {
+ stream.backUp(1);
+ if (stream.match(number)) {
+ stream.match(unit_regex);
+ return "number";
+ } else {
+ stream.next(); // move forward again
+ }
+ }
+
+ if (ch == "/") {
+ if (stream.eat("/")) {
+ stream.skipToEnd();
+ return "comment";
+ }
+
+ if (stream.eat("*")) {
+ this.push_scanner(comment);
+ return this.scanner(stream);
+ }
+ }
+
+ if (symbols[ch]) return "bracket";
+ if (symbols_2[ch]) return "builtin";
+
+ if (ch == "'" || ch == '"') {
+ this.push_scanner(string_matcher(ch, true));
+ return "string";
+ }
+ }
+
+ function value(stream) {
+ var ch = stream.next();
+
+ if (ch == ";" || ch == "}" || ch == "{") {
+ stream.backUp(1);
+ this.pop_scanner();
+ return;
+ }
+
+ if (ch == "#" && stream.match(color)) {
+ return "number";
+ }
+
+ if (ch == "@" && stream.match(atom)) {
+ return "variable-3";
+ }
+
+ if (ch.match(/[a-z]/i)) {
+ stream.backUp(1);
+ stream.match(atom);
+ var word = stream.current();
+ if (word == "url" && stream.eat("(")) {
+ this.push_scanner(string_matcher(")", false, "tag"));
+ return "tag";
+ }
+
+ if (word.match(value_words)) {
+ return "meta";
+ }
+
+ if (word.match(colors)) {
+ return "variable-2";
+ }
+ }
+
+ return this.common_value(ch, stream);
+ }
+
+ function comment(stream) {
+ while (stream.skipTo("*")) {
+ if (stream.eat("*") && stream.eat("/")) {
+ this.pop_scanner();
+ return "comment";
+ }
+ }
+ stream.skipToEnd();
+ return "comment";
+ }
+
+ var interp_patt = /^{[a-z_-][\w_-]*}/i;
+
+ function string_matcher(end_delim, can_escape, delim_type) {
+ return function string(stream) {
+ var ch = stream.next();
+
+ if (can_escape && ch == "\\" && (stream.eat(end_delim) || stream.eat("\\"))) {
+ return "string";
+ }
+
+ if (ch == "@" && stream.match(interp_patt)) {
+ return "variable-3";
+ }
+
+ if (ch == end_delim) {
+ this.pop_scanner();
+ return delim_type || "string";
+ }
+
+ return "string";
+ }
+ }
+
+ return {
+ startState: function() {
+ return {
+ scanner: normal,
+ common_value: common_value,
+ brace_depth: 0,
+
+ push_scanner: function(scanner) {
+ this._scanners = this._scanners || [];
+ this._scanners.push(this.scanner);
+ this.scanner = scanner;
+ },
+
+ pop_scanner: function() {
+ this.scanner = this._scanners.pop();
+ }
+ }
+ },
+ token: function(stream, state) {
+ if (stream.eatSpace()) return null;
+ return state.scanner(stream);
+ }
+ }
+});