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From gar...@apache.org
Subject [12/21] working with less and css
Date Mon, 08 Jul 2013 16:00:05 GMT
http://git-wip-us.apache.org/repos/asf/couchdb/blob/4d06c100/src/fauxton/assets/js/plugins/require-less/lessc.js
----------------------------------------------------------------------
diff --git a/src/fauxton/assets/js/plugins/require-less/lessc.js b/src/fauxton/assets/js/plugins/require-less/lessc.js
new file mode 100644
index 0000000..d22e77e
--- /dev/null
+++ b/src/fauxton/assets/js/plugins/require-less/lessc.js
@@ -0,0 +1,4441 @@
+//requirejs server changes - 
+//  typeof window === 'undefined' ? undefined : window on window inclusion.
+//  changed require stub on line 17
+//  line 3232:   if (typeof window === 'undefined') return;
+
+//
+// LESS - Leaner CSS v1.3.0
+// http://lesscss.org
+// 
+// Copyright (c) 2009-2011, Alexis Sellier
+// Licensed under the Apache 2.0 License.
+//
+
+
+(function (root, factory) {
+    if (typeof define === 'function' && define.amd) {
+        // AMD. Register as an anonymous module.
+        define(factory);
+    } else {
+        // Browser globals
+        window.less = factory();
+    }
+}(this, function() {
+//
+// LESS - Leaner CSS v1.3.3
+// http://lesscss.org
+// 
+// Copyright (c) 2009-2013, Alexis Sellier
+// Licensed under the Apache 2.0 License.
+//
+
+//
+// Stub out `require` in the browser
+//
+/* function require(arg) {
+    return window.less[arg.split('/')[1]];
+}; */
+function require(arg) {
+    if (arg == './tree' || arg == '../tree') {
+        if (tree === undefined)
+            tree = {};
+        return tree;
+    }
+    else
+        return less[arg.split('/')[1]];
+}
+
+
+// ecma-5.js
+//
+// -- kriskowal Kris Kowal Copyright (C) 2009-2010 MIT License
+// -- tlrobinson Tom Robinson
+// dantman Daniel Friesen
+
+//
+// Array
+//
+if (!Array.isArray) {
+    Array.isArray = function(obj) {
+        return Object.prototype.toString.call(obj) === "[object Array]" ||
+               (obj instanceof Array);
+    };
+}
+if (!Array.prototype.forEach) {
+    Array.prototype.forEach =  function(block, thisObject) {
+        var len = this.length >>> 0;
+        for (var i = 0; i < len; i++) {
+            if (i in this) {
+                block.call(thisObject, this[i], i, this);
+            }
+        }
+    };
+}
+if (!Array.prototype.map) {
+    Array.prototype.map = function(fun /*, thisp*/) {
+        var len = this.length >>> 0;
+        var res = new Array(len);
+        var thisp = arguments[1];
+
+        for (var i = 0; i < len; i++) {
+            if (i in this) {
+                res[i] = fun.call(thisp, this[i], i, this);
+            }
+        }
+        return res;
+    };
+}
+if (!Array.prototype.filter) {
+    Array.prototype.filter = function (block /*, thisp */) {
+        var values = [];
+        var thisp = arguments[1];
+        for (var i = 0; i < this.length; i++) {
+            if (block.call(thisp, this[i])) {
+                values.push(this[i]);
+            }
+        }
+        return values;
+    };
+}
+if (!Array.prototype.reduce) {
+    Array.prototype.reduce = function(fun /*, initial*/) {
+        var len = this.length >>> 0;
+        var i = 0;
+
+        // no value to return if no initial value and an empty array
+        if (len === 0 && arguments.length === 1) throw new TypeError();
+
+        if (arguments.length >= 2) {
+            var rv = arguments[1];
+        } else {
+            do {
+                if (i in this) {
+                    rv = this[i++];
+                    break;
+                }
+                // if array contains no values, no initial value to return
+                if (++i >= len) throw new TypeError();
+            } while (true);
+        }
+        for (; i < len; i++) {
+            if (i in this) {
+                rv = fun.call(null, rv, this[i], i, this);
+            }
+        }
+        return rv;
+    };
+}
+if (!Array.prototype.indexOf) {
+    Array.prototype.indexOf = function (value /*, fromIndex */ ) {
+        var length = this.length;
+        var i = arguments[1] || 0;
+
+        if (!length)     return -1;
+        if (i >= length) return -1;
+        if (i < 0)       i += length;
+
+        for (; i < length; i++) {
+            if (!Object.prototype.hasOwnProperty.call(this, i)) { continue }
+            if (value === this[i]) return i;
+        }
+        return -1;
+    };
+}
+
+//
+// Object
+//
+if (!Object.keys) {
+    Object.keys = function (object) {
+        var keys = [];
+        for (var name in object) {
+            if (Object.prototype.hasOwnProperty.call(object, name)) {
+                keys.push(name);
+            }
+        }
+        return keys;
+    };
+}
+
+//
+// String
+//
+if (!String.prototype.trim) {
+    String.prototype.trim = function () {
+        return String(this).replace(/^\s\s*/, '').replace(/\s\s*$/, '');
+    };
+}
+var less, tree, charset;
+if (typeof environment === "object" && ({}).toString.call(environment) === "[object Environment]") {
+    // Rhino
+    // Details on how to detect Rhino: https://github.com/ringo/ringojs/issues/88
+    if (typeof(window) === 'undefined') { less = {} }
+    else                                { less = window.less = {} }
+    tree = less.tree = {};
+    less.mode = 'rhino';
+} else if (typeof(window) === 'undefined') {
+    // Node.js
+    less = typeof exports != 'undefined' ? exports : {},
+    tree = require('./tree');
+    less.mode = 'node';
+} else {
+    // Browser
+    if (typeof(window.less) === 'undefined') { window.less = {} }
+    less = window.less,
+    tree = window.less.tree = {};
+    less.mode = 'browser';
+}
+//
+// less.js - parser
+//
+//    A relatively straight-forward predictive parser.
+//    There is no tokenization/lexing stage, the input is parsed
+//    in one sweep.
+//
+//    To make the parser fast enough to run in the browser, several
+//    optimization had to be made:
+//
+//    - Matching and slicing on a huge input is often cause of slowdowns.
+//      The solution is to chunkify the input into smaller strings.
+//      The chunks are stored in the `chunks` var,
+//      `j` holds the current chunk index, and `current` holds
+//      the index of the current chunk in relation to `input`.
+//      This gives us an almost 4x speed-up.
+//
+//    - In many cases, we don't need to match individual tokens;
+//      for example, if a value doesn't hold any variables, operations
+//      or dynamic references, the parser can effectively 'skip' it,
+//      treating it as a literal.
+//      An example would be '1px solid #000' - which evaluates to itself,
+//      we don't need to know what the individual components are.
+//      The drawback, of course is that you don't get the benefits of
+//      syntax-checking on the CSS. This gives us a 50% speed-up in the parser,
+//      and a smaller speed-up in the code-gen.
+//
+//
+//    Token matching is done with the `$` function, which either takes
+//    a terminal string or regexp, or a non-terminal function to call.
+//    It also takes care of moving all the indices forwards.
+//
+//
+less.Parser = function Parser(env) {
+    var input,       // LeSS input string
+        i,           // current index in `input`
+        j,           // current chunk
+        temp,        // temporarily holds a chunk's state, for backtracking
+        memo,        // temporarily holds `i`, when backtracking
+        furthest,    // furthest index the parser has gone to
+        chunks,      // chunkified input
+        current,     // index of current chunk, in `input`
+        parser;
+
+    var that = this;
+
+    // Top parser on an import tree must be sure there is one "env"
+    // which will then be passed arround by reference.
+    var env = env || { };
+    // env.contents and files must be passed arround with top env
+    if (!env.contents) { env.contents = {}; }
+    env.rootpath = env.rootpath || '';       // env.rootpath must be initialized to '' if not provided
+    if (!env.files) { env.files = {}; }
+
+    // This function is called after all files
+    // have been imported through `@import`.
+    var finish = function () {};
+
+    var imports = this.imports = {
+        paths: env.paths || [],  // Search paths, when importing
+        queue: [],               // Files which haven't been imported yet
+        files: env.files,        // Holds the imported parse trees
+        contents: env.contents,  // Holds the imported file contents
+        mime:  env.mime,         // MIME type of .less files
+        error: null,             // Error in parsing/evaluating an import
+        push: function (path, callback) {
+            var that = this;
+            this.queue.push(path);
+
+            //
+            // Import a file asynchronously
+            //
+            less.Parser.importer(path, this.paths, function (e, root, fullPath) {
+                that.queue.splice(that.queue.indexOf(path), 1); // Remove the path from the queue
+
+                var imported = fullPath in that.files;
+
+                that.files[fullPath] = root;                        // Store the root
+
+                if (e && !that.error) { that.error = e }
+
+                callback(e, root, imported);
+
+                if (that.queue.length === 0) { finish(that.error) }       // Call `finish` if we're done importing
+            }, env);
+        }
+    };
+
+    function save()    { temp = chunks[j], memo = i, current = i }
+    function restore() { chunks[j] = temp, i = memo, current = i }
+
+    function sync() {
+        if (i > current) {
+            chunks[j] = chunks[j].slice(i - current);
+            current = i;
+        }
+    }
+    function isWhitespace(c) {
+        // Could change to \s?
+        var code = c.charCodeAt(0);
+        return code === 32 || code === 10 || code === 9;
+    }
+    //
+    // Parse from a token, regexp or string, and move forward if match
+    //
+    function $(tok) {
+        var match, args, length, index, k;
+
+        //
+        // Non-terminal
+        //
+        if (tok instanceof Function) {
+            return tok.call(parser.parsers);
+        //
+        // Terminal
+        //
+        //     Either match a single character in the input,
+        //     or match a regexp in the current chunk (chunk[j]).
+        //
+        } else if (typeof(tok) === 'string') {
+            match = input.charAt(i) === tok ? tok : null;
+            length = 1;
+            sync ();
+        } else {
+            sync ();
+
+            if (match = tok.exec(chunks[j])) {
+                length = match[0].length;
+            } else {
+                return null;
+            }
+        }
+
+        // The match is confirmed, add the match length to `i`,
+        // and consume any extra white-space characters (' ' || '\n')
+        // which come after that. The reason for this is that LeSS's
+        // grammar is mostly white-space insensitive.
+        //
+        if (match) {
+            skipWhitespace(length);
+
+            if(typeof(match) === 'string') {
+                return match;
+            } else {
+                return match.length === 1 ? match[0] : match;
+            }
+        }
+    }
+
+    function skipWhitespace(length) {
+        var oldi = i, oldj = j,
+            endIndex = i + chunks[j].length,
+            mem = i += length;
+
+        while (i < endIndex) {
+            if (! isWhitespace(input.charAt(i))) { break }
+            i++;
+        }
+        chunks[j] = chunks[j].slice(length + (i - mem));
+        current = i;
+
+        if (chunks[j].length === 0 && j < chunks.length - 1) { j++ }
+
+        return oldi !== i || oldj !== j;
+    }
+
+    function expect(arg, msg) {
+        var result = $(arg);
+        if (! result) {
+            error(msg || (typeof(arg) === 'string' ? "expected '" + arg + "' got '" + input.charAt(i) + "'"
+                                                   : "unexpected token"));
+        } else {
+            return result;
+        }
+    }
+
+    function error(msg, type) {
+        var e = new Error(msg);
+        e.index = i;
+        e.type = type || 'Syntax';
+        throw e;
+    }
+
+    // Same as $(), but don't change the state of the parser,
+    // just return the match.
+    function peek(tok) {
+        if (typeof(tok) === 'string') {
+            return input.charAt(i) === tok;
+        } else {
+            if (tok.test(chunks[j])) {
+                return true;
+            } else {
+                return false;
+            }
+        }
+    }
+
+    function getInput(e, env) {
+        if (e.filename && env.filename && (e.filename !== env.filename)) {
+            return parser.imports.contents[e.filename];
+        } else {
+            return input;
+        }
+    }
+
+    function getLocation(index, input) {
+        for (var n = index, column = -1;
+                 n >= 0 && input.charAt(n) !== '\n';
+                 n--) { column++ }
+
+        return { line:   typeof(index) === 'number' ? (input.slice(0, index).match(/\n/g) || "").length : null,
+                 column: column };
+    }
+
+    function getFileName(e) {
+        if(less.mode === 'browser' || less.mode === 'rhino')
+            return e.filename;
+        else
+            return require('path').resolve(e.filename);
+    }
+
+    function getDebugInfo(index, inputStream, e) {
+        return {
+            lineNumber: getLocation(index, inputStream).line + 1,
+            fileName: getFileName(e)
+        };
+    }
+
+    function LessError(e, env) {
+        var input = getInput(e, env),
+            loc = getLocation(e.index, input),
+            line = loc.line,
+            col  = loc.column,
+            lines = input.split('\n');
+
+        this.type = e.type || 'Syntax';
+        this.message = e.message;
+        this.filename = e.filename || env.filename;
+        this.index = e.index;
+        this.line = typeof(line) === 'number' ? line + 1 : null;
+        this.callLine = e.call && (getLocation(e.call, input).line + 1);
+        this.callExtract = lines[getLocation(e.call, input).line];
+        this.stack = e.stack;
+        this.column = col;
+        this.extract = [
+            lines[line - 1],
+            lines[line],
+            lines[line + 1]
+        ];
+    }
+
+    this.env = env = env || {};
+
+    // The optimization level dictates the thoroughness of the parser,
+    // the lower the number, the less nodes it will create in the tree.
+    // This could matter for debugging, or if you want to access
+    // the individual nodes in the tree.
+    this.optimization = ('optimization' in this.env) ? this.env.optimization : 1;
+
+    this.env.filename = this.env.filename || null;
+
+    //
+    // The Parser
+    //
+    return parser = {
+
+        imports: imports,
+        //
+        // Parse an input string into an abstract syntax tree,
+        // call `callback` when done.
+        //
+        parse: function (str, callback) {
+            var root, start, end, zone, line, lines, buff = [], c, error = null;
+
+            i = j = current = furthest = 0;
+            input = str.replace(/\r\n/g, '\n');
+
+            // Remove potential UTF Byte Order Mark
+            input = input.replace(/^\uFEFF/, '');
+
+            // Split the input into chunks.
+            chunks = (function (chunks) {
+                var j = 0,
+                    skip = /(?:@\{[\w-]+\}|[^"'`\{\}\/\(\)\\])+/g,
+                    comment = /\/\*(?:[^*]|\*+[^\/*])*\*+\/|\/\/.*/g,
+                    string = /"((?:[^"\\\r\n]|\\.)*)"|'((?:[^'\\\r\n]|\\.)*)'|`((?:[^`]|\\.)*)`/g,
+                    level = 0,
+                    match,
+                    chunk = chunks[0],
+                    inParam;
+
+                for (var i = 0, c, cc; i < input.length;) {
+                    skip.lastIndex = i;
+                    if (match = skip.exec(input)) {
+                        if (match.index === i) {
+                            i += match[0].length;
+                            chunk.push(match[0]);
+                        }
+                    }
+                    c = input.charAt(i);
+                    comment.lastIndex = string.lastIndex = i;
+
+                    if (match = string.exec(input)) {
+                        if (match.index === i) {
+                            i += match[0].length;
+                            chunk.push(match[0]);
+                            continue;
+                        }
+                    }
+
+                    if (!inParam && c === '/') {
+                        cc = input.charAt(i + 1);
+                        if (cc === '/' || cc === '*') {
+                            if (match = comment.exec(input)) {
+                                if (match.index === i) {
+                                    i += match[0].length;
+                                    chunk.push(match[0]);
+                                    continue;
+                                }
+                            }
+                        }
+                    }
+                    
+                    switch (c) {
+                        case '{': if (! inParam) { level ++;        chunk.push(c);                           break }
+                        case '}': if (! inParam) { level --;        chunk.push(c); chunks[++j] = chunk = []; break }
+                        case '(': if (! inParam) { inParam = true;  chunk.push(c);                           break }
+                        case ')': if (  inParam) { inParam = false; chunk.push(c);                           break }
+                        default:                                    chunk.push(c);
+                    }
+                    
+                    i++;
+                }
+                if (level != 0) {
+                    error = new(LessError)({
+                        index: i-1,
+                        type: 'Parse',
+                        message: (level > 0) ? "missing closing `}`" : "missing opening `{`",
+                        filename: env.filename
+                    }, env);
+                }
+
+                return chunks.map(function (c) { return c.join('') });;
+            })([[]]);
+
+            if (error) {
+                return callback(error, env);
+            }
+
+            // Start with the primary rule.
+            // The whole syntax tree is held under a Ruleset node,
+            // with the `root` property set to true, so no `{}` are
+            // output. The callback is called when the input is parsed.
+            try {
+                root = new(tree.Ruleset)([], $(this.parsers.primary));
+                root.root = true;
+            } catch (e) {
+                return callback(new(LessError)(e, env));
+            }
+
+            root.toCSS = (function (evaluate) {
+                var line, lines, column;
+
+                return function (options, variables) {
+                    var frames = [], importError;
+
+                    options = options || {};
+                    //
+                    // Allows setting variables with a hash, so:
+                    //
+                    //   `{ color: new(tree.Color)('#f01') }` will become:
+                    //
+                    //   new(tree.Rule)('@color',
+                    //     new(tree.Value)([
+                    //       new(tree.Expression)([
+                    //         new(tree.Color)('#f01')
+                    //       ])
+                    //     ])
+                    //   )
+                    //
+                    if (typeof(variables) === 'object' && !Array.isArray(variables)) {
+                        variables = Object.keys(variables).map(function (k) {
+                            var value = variables[k];
+
+                            if (! (value instanceof tree.Value)) {
+                                if (! (value instanceof tree.Expression)) {
+                                    value = new(tree.Expression)([value]);
+                                }
+                                value = new(tree.Value)([value]);
+                            }
+                            return new(tree.Rule)('@' + k, value, false, 0);
+                        });
+                        frames = [new(tree.Ruleset)(null, variables)];
+                    }
+
+                    try {
+                        var css = evaluate.call(this, { frames: frames })
+                                          .toCSS([], { compress: options.compress || false, dumpLineNumbers: env.dumpLineNumbers });
+                    } catch (e) {
+                        throw new(LessError)(e, env);
+                    }
+
+                    if ((importError = parser.imports.error)) { // Check if there was an error during importing
+                        if (importError instanceof LessError) throw importError;
+                        else                                  throw new(LessError)(importError, env);
+                    }
+
+                    if (options.yuicompress && less.mode === 'node') {
+                        return require('ycssmin').cssmin(css);
+                    } else if (options.compress) {
+                        return css.replace(/(\s)+/g, "$1");
+                    } else {
+                        return css;
+                    }
+                };
+            })(root.eval);
+
+            // If `i` is smaller than the `input.length - 1`,
+            // it means the parser wasn't able to parse the whole
+            // string, so we've got a parsing error.
+            //
+            // We try to extract a \n delimited string,
+            // showing the line where the parse error occured.
+            // We split it up into two parts (the part which parsed,
+            // and the part which didn't), so we can color them differently.
+            if (i < input.length - 1) {
+                i = furthest;
+                lines = input.split('\n');
+                line = (input.slice(0, i).match(/\n/g) || "").length + 1;
+
+                for (var n = i, column = -1; n >= 0 && input.charAt(n) !== '\n'; n--) { column++ }
+
+                error = {
+                    type: "Parse",
+                    message: "Syntax Error on line " + line,
+                    index: i,
+                    filename: env.filename,
+                    line: line,
+                    column: column,
+                    extract: [
+                        lines[line - 2],
+                        lines[line - 1],
+                        lines[line]
+                    ]
+                };
+            }
+
+            if (this.imports.queue.length > 0) {
+                finish = function (e) {
+                    e = error || e;
+                    if (e) callback(e);
+                    else callback(null, root);
+                };
+            } else {
+                callback(error, root);
+            }
+        },
+
+        //
+        // Here in, the parsing rules/functions
+        //
+        // The basic structure of the syntax tree generated is as follows:
+        //
+        //   Ruleset ->  Rule -> Value -> Expression -> Entity
+        //
+        // Here's some LESS code:
+        //
+        //    .class {
+        //      color: #fff;
+        //      border: 1px solid #000;
+        //      width: @w + 4px;
+        //      > .child {...}
+        //    }
+        //
+        // And here's what the parse tree might look like:
+        //
+        //     Ruleset (Selector '.class', [
+        //         Rule ("color",  Value ([Expression [Color #fff]]))
+        //         Rule ("border", Value ([Expression [Dimension 1px][Keyword "solid"][Color #000]]))
+        //         Rule ("width",  Value ([Expression [Operation "+" [Variable "@w"][Dimension 4px]]]))
+        //         Ruleset (Selector [Element '>', '.child'], [...])
+        //     ])
+        //
+        //  In general, most rules will try to parse a token with the `$()` function, and if the return
+        //  value is truly, will return a new node, of the relevant type. Sometimes, we need to check
+        //  first, before parsing, that's when we use `peek()`.
+        //
+        parsers: {
+            //
+            // The `primary` rule is the *entry* and *exit* point of the parser.
+            // The rules here can appear at any level of the parse tree.
+            //
+            // The recursive nature of the grammar is an interplay between the `block`
+            // rule, which represents `{ ... }`, the `ruleset` rule, and this `primary` rule,
+            // as represented by this simplified grammar:
+            //
+            //     primary  →  (ruleset | rule)+
+            //     ruleset  →  selector+ block
+            //     block    →  '{' primary '}'
+            //
+            // Only at one point is the primary rule not called from the
+            // block rule: at the root level.
+            //
+            primary: function () {
+                var node, root = [];
+
+                while ((node = $(this.mixin.definition) || $(this.rule)    ||  $(this.ruleset) ||
+                               $(this.mixin.call)       || $(this.comment) ||  $(this.directive))
+                               || $(/^[\s\n]+/) || $(/^;+/)) {
+                    node && root.push(node);
+                }
+                return root;
+            },
+
+            // We create a Comment node for CSS comments `/* */`,
+            // but keep the LeSS comments `//` silent, by just skipping
+            // over them.
+            comment: function () {
+                var comment;
+
+                if (input.charAt(i) !== '/') return;
+
+                if (input.charAt(i + 1) === '/') {
+                    return new(tree.Comment)($(/^\/\/.*/), true);
+                } else if (comment = $(/^\/\*(?:[^*]|\*+[^\/*])*\*+\/\n?/)) {
+                    return new(tree.Comment)(comment);
+                }
+            },
+
+            //
+            // Entities are tokens which can be found inside an Expression
+            //
+            entities: {
+                //
+                // A string, which supports escaping " and '
+                //
+                //     "milky way" 'he\'s the one!'
+                //
+                quoted: function () {
+                    var str, j = i, e;
+
+                    if (input.charAt(j) === '~') { j++, e = true } // Escaped strings
+                    if (input.charAt(j) !== '"' && input.charAt(j) !== "'") return;
+
+                    e && $('~');
+
+                    if (str = $(/^"((?:[^"\\\r\n]|\\.)*)"|'((?:[^'\\\r\n]|\\.)*)'/)) {
+                        return new(tree.Quoted)(str[0], str[1] || str[2], e);
+                    }
+                },
+
+                //
+                // A catch-all word, such as:
+                //
+                //     black border-collapse
+                //
+                keyword: function () {
+                    var k;
+
+                    if (k = $(/^[_A-Za-z-][_A-Za-z0-9-]*/)) {
+                        if (tree.colors.hasOwnProperty(k)) {
+                            // detect named color
+                            return new(tree.Color)(tree.colors[k].slice(1));
+                        } else {
+                            return new(tree.Keyword)(k);
+                        }
+                    }
+                },
+
+                //
+                // A function call
+                //
+                //     rgb(255, 0, 255)
+                //
+                // We also try to catch IE's `alpha()`, but let the `alpha` parser
+                // deal with the details.
+                //
+                // The arguments are parsed with the `entities.arguments` parser.
+                //
+                call: function () {
+                    var name, nameLC, args, alpha_ret, index = i;
+
+                    if (! (name = /^([\w-]+|%|progid:[\w\.]+)\(/.exec(chunks[j]))) return;
+
+                    name = name[1];
+                    nameLC = name.toLowerCase();
+
+                    if (nameLC === 'url') { return null }
+                    else                { i += name.length }
+
+                    if (nameLC === 'alpha') {
+                        alpha_ret = $(this.alpha);
+                        if(typeof alpha_ret !== 'undefined') {
+                            return alpha_ret;
+                        }
+                    }
+
+                    $('('); // Parse the '(' and consume whitespace.
+
+                    args = $(this.entities.arguments);
+
+                    if (! $(')')) return;
+
+                    if (name) { return new(tree.Call)(name, args, index, env.filename) }
+                },
+                arguments: function () {
+                    var args = [], arg;
+
+                    while (arg = $(this.entities.assignment) || $(this.expression)) {
+                        args.push(arg);
+                        if (! $(',')) { break }
+                    }
+                    return args;
+                },
+                literal: function () {
+                    return $(this.entities.ratio) ||
+                           $(this.entities.dimension) ||
+                           $(this.entities.color) ||
+                           $(this.entities.quoted) ||
+                           $(this.entities.unicodeDescriptor);
+                },
+
+                // Assignments are argument entities for calls.
+                // They are present in ie filter properties as shown below.
+                //
+                //     filter: progid:DXImageTransform.Microsoft.Alpha( *opacity=50* )
+                //
+
+                assignment: function () {
+                    var key, value;
+                    if ((key = $(/^\w+(?=\s?=)/i)) && $('=') && (value = $(this.entity))) {
+                        return new(tree.Assignment)(key, value);
+                    }
+                },
+
+                //
+                // Parse url() tokens
+                //
+                // We use a specific rule for urls, because they don't really behave like
+                // standard function calls. The difference is that the argument doesn't have
+                // to be enclosed within a string, so it can't be parsed as an Expression.
+                //
+                url: function () {
+                    var value;
+
+                    if (input.charAt(i) !== 'u' || !$(/^url\(/)) return;
+                    value = $(this.entities.quoted)  || $(this.entities.variable) ||
+                            $(/^(?:(?:\\[\(\)'"])|[^\(\)'"])+/) || "";
+
+                    expect(')');
+
+                    return new(tree.URL)((value.value != null || value instanceof tree.Variable)
+                                        ? value : new(tree.Anonymous)(value), env.rootpath);
+                },
+
+                //
+                // A Variable entity, such as `@fink`, in
+                //
+                //     width: @fink + 2px
+                //
+                // We use a different parser for variable definitions,
+                // see `parsers.variable`.
+                //
+                variable: function () {
+                    var name, index = i;
+
+                    if (input.charAt(i) === '@' && (name = $(/^@@?[\w-]+/))) {
+                        return new(tree.Variable)(name, index, env.filename);
+                    }
+                },
+
+                // A variable entity useing the protective {} e.g. @{var}
+                variableCurly: function () {
+                    var name, curly, index = i;
+
+                    if (input.charAt(i) === '@' && (curly = $(/^@\{([\w-]+)\}/))) {
+                        return new(tree.Variable)("@" + curly[1], index, env.filename);
+                    }
+                },
+
+                //
+                // A Hexadecimal color
+                //
+                //     #4F3C2F
+                //
+                // `rgb` and `hsl` colors are parsed through the `entities.call` parser.
+                //
+                color: function () {
+                    var rgb;
+
+                    if (input.charAt(i) === '#' && (rgb = $(/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/))) {
+                        return new(tree.Color)(rgb[1]);
+                    }
+                },
+
+                //
+                // A Dimension, that is, a number and a unit
+                //
+                //     0.5em 95%
+                //
+                dimension: function () {
+                    var value, c = input.charCodeAt(i);
+                    //Is the first char of the dimension 0-9, '.', '+' or '-'
+                    if ((c > 57 || c < 43) || c === 47 || c == 44) return;
+
+                    if (value = $(/^([+-]?\d*\.?\d+)(px|%|em|pc|ex|in|deg|s|ms|pt|cm|mm|rad|grad|turn|dpi|dpcm|dppx|rem|vw|vh|vmin|vm|ch)?/)) {
+                        return new(tree.Dimension)(value[1], value[2]);
+                    }
+                },
+
+                //
+                // A Ratio
+                //
+                //    16/9
+                //
+                ratio: function () {
+                  var value, c = input.charCodeAt(i);
+                  if (c > 57 || c < 48) return;
+
+                  if (value = $(/^(\d+\/\d+)/)) {
+                    return new(tree.Ratio)(value[1]);
+                  }
+                },
+                
+                //
+                // A unicode descriptor, as is used in unicode-range
+                //
+                // U+0??  or U+00A1-00A9
+                //
+                unicodeDescriptor: function () {
+                    var ud;
+                    
+                    if (ud = $(/^U\+[0-9a-fA-F?]+(\-[0-9a-fA-F?]+)?/)) {
+                        return new(tree.UnicodeDescriptor)(ud[0]);
+                    }
+                },
+
+                //
+                // JavaScript code to be evaluated
+                //
+                //     `window.location.href`
+                //
+                javascript: function () {
+                    var str, j = i, e;
+
+                    if (input.charAt(j) === '~') { j++, e = true } // Escaped strings
+                    if (input.charAt(j) !== '`') { return }
+
+                    e && $('~');
+
+                    if (str = $(/^`([^`]*)`/)) {
+                        return new(tree.JavaScript)(str[1], i, e);
+                    }
+                }
+            },
+
+            //
+            // The variable part of a variable definition. Used in the `rule` parser
+            //
+            //     @fink:
+            //
+            variable: function () {
+                var name;
+
+                if (input.charAt(i) === '@' && (name = $(/^(@[\w-]+)\s*:/))) { return name[1] }
+            },
+
+            //
+            // A font size/line-height shorthand
+            //
+            //     small/12px
+            //
+            // We need to peek first, or we'll match on keywords and dimensions
+            //
+            shorthand: function () {
+                var a, b;
+
+                if (! peek(/^[@\w.%-]+\/[@\w.-]+/)) return;
+
+                save();
+
+                if ((a = $(this.entity)) && $('/') && (b = $(this.entity))) {
+                    return new(tree.Shorthand)(a, b);
+                }
+
+                restore();
+            },
+
+            //
+            // Mixins
+            //
+            mixin: {
+                //
+                // A Mixin call, with an optional argument list
+                //
+                //     #mixins > .square(#fff);
+                //     .rounded(4px, black);
+                //     .button;
+                //
+                // The `while` loop is there because mixins can be
+                // namespaced, but we only support the child and descendant
+                // selector for now.
+                //
+                call: function () {
+                    var elements = [], e, c, argsSemiColon = [], argsComma = [], args, delim, arg, nameLoop, expressions, isSemiColonSeperated, expressionContainsNamed, index = i, s = input.charAt(i), name, value, important = false;
+
+                    if (s !== '.' && s !== '#') { return }
+                    
+                    save(); // stop us absorbing part of an invalid selector
+
+                    while (e = $(/^[#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/)) {
+                        elements.push(new(tree.Element)(c, e, i));
+                        c = $('>');
+                    }
+                    if ($('(')) {
+                        expressions = [];
+                        while (arg = $(this.expression)) {
+                            nameLoop = null;
+                            value = arg;
+
+                            // Variable
+                            if (arg.value.length == 1) {
+                                var val = arg.value[0];
+                                if (val instanceof tree.Variable) {
+                                    if ($(':')) {
+                                        if (expressions.length > 0) {
+                                            if (isSemiColonSeperated) {
+                                                error("Cannot mix ; and , as delimiter types");
+                                            }
+                                            expressionContainsNamed = true;
+                                        }
+                                        value = expect(this.expression);
+                                        nameLoop = (name = val.name);
+                                    }
+                                }
+                            }
+                            
+                            expressions.push(value);
+                            
+                            argsComma.push({ name: nameLoop, value: value });
+                            
+                            if ($(',')) {
+                                continue;
+                            }
+                            
+                            if ($(';') || isSemiColonSeperated) {
+                            
+                                if (expressionContainsNamed) {
+                                    error("Cannot mix ; and , as delimiter types");
+                                }
+                            
+                                isSemiColonSeperated = true;
+                                                        
+                                if (expressions.length > 1) {
+                                    value = new(tree.Value)(expressions);
+                                }
+                                argsSemiColon.push({ name: name, value: value });
+                            
+                                name = null;
+                                expressions = [];
+                                expressionContainsNamed = false;
+                            }
+                        }
+
+                        expect(')');
+                    }
+
+                    args = isSemiColonSeperated ? argsSemiColon : argsComma;
+
+                    if ($(this.important)) {
+                        important = true;
+                    }
+
+                    if (elements.length > 0 && ($(';') || peek('}'))) {
+                        return new(tree.mixin.Call)(elements, args, index, env.filename, important);
+                    }
+                    
+                    restore();
+                },
+
+                //
+                // A Mixin definition, with a list of parameters
+                //
+                //     .rounded (@radius: 2px, @color) {
+                //        ...
+                //     }
+                //
+                // Until we have a finer grained state-machine, we have to
+                // do a look-ahead, to make sure we don't have a mixin call.
+                // See the `rule` function for more information.
+                //
+                // We start by matching `.rounded (`, and then proceed on to
+                // the argument list, which has optional default values.
+                // We store the parameters in `params`, with a `value` key,
+                // if there is a value, such as in the case of `@radius`.
+                //
+                // Once we've got our params list, and a closing `)`, we parse
+                // the `{...}` block.
+                //
+                definition: function () {
+                    var name, params = [], match, ruleset, param, value, cond, variadic = false;
+                    if ((input.charAt(i) !== '.' && input.charAt(i) !== '#') ||
+                        peek(/^[^{]*\}/)) return;
+
+                    save();
+
+                    if (match = $(/^([#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+)\s*\(/)) {
+                        name = match[1];
+
+                        do {
+                            $(this.comment);
+                            if (input.charAt(i) === '.' && $(/^\.{3}/)) {
+                                variadic = true;
+                                params.push({ variadic: true });
+                                break;
+                            } else if (param = $(this.entities.variable) || $(this.entities.literal)
+                                                                         || $(this.entities.keyword)) {
+                                // Variable
+                                if (param instanceof tree.Variable) {
+                                    if ($(':')) {
+                                        value = expect(this.expression, 'expected expression');
+                                        params.push({ name: param.name, value: value });
+                                    } else if ($(/^\.{3}/)) {
+                                        params.push({ name: param.name, variadic: true });
+                                        variadic = true;
+                                        break;
+                                    } else {
+                                        params.push({ name: param.name });
+                                    }
+                                } else {
+                                    params.push({ value: param });
+                                }
+                            } else {
+                                break;
+                            }
+                        } while ($(',') || $(';'))
+
+                        // .mixincall("@{a}"); 
+                        // looks a bit like a mixin definition.. so we have to be nice and restore
+                        if (!$(')')) {
+                            furthest = i;
+                            restore();
+                        }
+                        
+                        $(this.comment);
+
+                        if ($(/^when/)) { // Guard
+                            cond = expect(this.conditions, 'expected condition');
+                        }
+
+                        ruleset = $(this.block);
+
+                        if (ruleset) {
+                            return new(tree.mixin.Definition)(name, params, ruleset, cond, variadic);
+                        } else {
+                            restore();
+                        }
+                    }
+                }
+            },
+
+            //
+            // Entities are the smallest recognized token,
+            // and can be found inside a rule's value.
+            //
+            entity: function () {
+                return $(this.entities.literal) || $(this.entities.variable) || $(this.entities.url) ||
+                       $(this.entities.call)    || $(this.entities.keyword)  ||$(this.entities.javascript) ||
+                       $(this.comment);
+            },
+
+            //
+            // A Rule terminator. Note that we use `peek()` to check for '}',
+            // because the `block` rule will be expecting it, but we still need to make sure
+            // it's there, if ';' was ommitted.
+            //
+            end: function () {
+                return $(';') || peek('}');
+            },
+
+            //
+            // IE's alpha function
+            //
+            //     alpha(opacity=88)
+            //
+            alpha: function () {
+                var value;
+
+                if (! $(/^\(opacity=/i)) return;
+                if (value = $(/^\d+/) || $(this.entities.variable)) {
+                    expect(')');
+                    return new(tree.Alpha)(value);
+                }
+            },
+
+            //
+            // A Selector Element
+            //
+            //     div
+            //     + h1
+            //     #socks
+            //     input[type="text"]
+            //
+            // Elements are the building blocks for Selectors,
+            // they are made out of a `Combinator` (see combinator rule),
+            // and an element name, such as a tag a class, or `*`.
+            //
+            element: function () {
+                var e, t, c, v;
+
+                c = $(this.combinator);
+
+                e = $(/^(?:\d+\.\d+|\d+)%/) || $(/^(?:[.#]?|:*)(?:[\w-]|[^\x00-\x9f]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/) ||
+                    $('*') || $('&') || $(this.attribute) || $(/^\([^()@]+\)/) || $(/^[\.#](?=@)/) || $(this.entities.variableCurly);
+
+                if (! e) {
+                    if ($('(')) {
+                        if ((v = ($(this.entities.variableCurly) || 
+                                $(this.entities.variable) || 
+                                $(this.selector))) && 
+                                $(')')) {
+                            e = new(tree.Paren)(v);
+                        }
+                    }
+                }
+
+                if (e) { return new(tree.Element)(c, e, i) }
+            },
+
+            //
+            // Combinators combine elements together, in a Selector.
+            //
+            // Because our parser isn't white-space sensitive, special care
+            // has to be taken, when parsing the descendant combinator, ` `,
+            // as it's an empty space. We have to check the previous character
+            // in the input, to see if it's a ` ` character. More info on how
+            // we deal with this in *combinator.js*.
+            //
+            combinator: function () {
+                var match, c = input.charAt(i);
+
+                if (c === '>' || c === '+' || c === '~' || c === '|') {
+                    i++;
+                    while (input.charAt(i).match(/\s/)) { i++ }
+                    return new(tree.Combinator)(c);
+                } else if (input.charAt(i - 1).match(/\s/)) {
+                    return new(tree.Combinator)(" ");
+                } else {
+                    return new(tree.Combinator)(null);
+                }
+            },
+
+            //
+            // A CSS Selector
+            //
+            //     .class > div + h1
+            //     li a:hover
+            //
+            // Selectors are made out of one or more Elements, see above.
+            //
+            selector: function () {
+                var sel, e, elements = [], c, match;
+
+                // depreciated, will be removed soon
+                if ($('(')) {
+                    sel = $(this.entity);
+                    if (!$(')')) { return null; }
+                    return new(tree.Selector)([new(tree.Element)('', sel, i)]);
+                }
+
+                while (e = $(this.element)) {
+                    c = input.charAt(i);
+                    elements.push(e)
+                    if (c === '{' || c === '}' || c === ';' || c === ',' || c === ')') { break }
+                }
+
+                if (elements.length > 0) { return new(tree.Selector)(elements) }
+            },
+            attribute: function () {
+                var attr = '', key, val, op;
+
+                if (! $('[')) return;
+
+                if (key = $(/^(?:[_A-Za-z0-9-]|\\.)+/) || $(this.entities.quoted)) {
+                    if ((op = $(/^[|~*$^]?=/)) &&
+                        (val = $(this.entities.quoted) || $(/^[\w-]+/))) {
+                        attr = [key, op, val.toCSS ? val.toCSS() : val].join('');
+                    } else { attr = key }
+                }
+
+                if (! $(']')) return;
+
+                if (attr) { return "[" + attr + "]" }
+            },
+
+            //
+            // The `block` rule is used by `ruleset` and `mixin.definition`.
+            // It's a wrapper around the `primary` rule, with added `{}`.
+            //
+            block: function () {
+                var content;
+                if ($('{') && (content = $(this.primary)) && $('}')) {
+                    return content;
+                }
+            },
+
+            //
+            // div, .class, body > p {...}
+            //
+            ruleset: function () {
+                var selectors = [], s, rules, match, debugInfo;
+                
+                save();
+
+                if (env.dumpLineNumbers)
+                    debugInfo = getDebugInfo(i, input, env);
+
+                while (s = $(this.selector)) {
+                    selectors.push(s);
+                    $(this.comment);
+                    if (! $(',')) { break }
+                    $(this.comment);
+                }
+
+                if (selectors.length > 0 && (rules = $(this.block))) {
+                    var ruleset = new(tree.Ruleset)(selectors, rules, env.strictImports);
+                    if (env.dumpLineNumbers)
+                        ruleset.debugInfo = debugInfo;
+                    return ruleset;
+                } else {
+                    // Backtrack
+                    furthest = i;
+                    restore();
+                }
+            },
+            rule: function () {
+                var name, value, c = input.charAt(i), important, match;
+                save();
+
+                if (c === '.' || c === '#' || c === '&') { return }
+
+                if (name = $(this.variable) || $(this.property)) {
+                    if ((name.charAt(0) != '@') && (match = /^([^@+\/'"*`(;{}-]*);/.exec(chunks[j]))) {
+                        i += match[0].length - 1;
+                        value = new(tree.Anonymous)(match[1]);
+                    } else if (name === "font") {
+                        value = $(this.font);
+                    } else {
+                        value = $(this.value);
+                    }
+                    important = $(this.important);
+
+                    if (value && $(this.end)) {
+                        return new(tree.Rule)(name, value, important, memo);
+                    } else {
+                        furthest = i;
+                        restore();
+                    }
+                }
+            },
+
+            //
+            // An @import directive
+            //
+            //     @import "lib";
+            //
+            // Depending on our environemnt, importing is done differently:
+            // In the browser, it's an XHR request, in Node, it would be a
+            // file-system operation. The function used for importing is
+            // stored in `import`, which we pass to the Import constructor.
+            //
+            "import": function () {
+                var path, features, index = i;
+                
+                save();
+                
+                var dir = $(/^@import(?:-(once))?\s+/);
+
+                if (dir && (path = $(this.entities.quoted) || $(this.entities.url))) {
+                    features = $(this.mediaFeatures);
+                    if ($(';')) {
+                        return new(tree.Import)(path, imports, features, (dir[1] === 'once'), index, env.rootpath);
+                    }
+                }
+                
+                restore();
+            },
+
+            mediaFeature: function () {
+                var e, p, nodes = [];
+
+                do {
+                    if (e = $(this.entities.keyword)) {
+                        nodes.push(e);
+                    } else if ($('(')) {
+                        p = $(this.property);
+                        e = $(this.entity);
+                        if ($(')')) {
+                            if (p && e) {
+                                nodes.push(new(tree.Paren)(new(tree.Rule)(p, e, null, i, true)));
+                            } else if (e) {
+                                nodes.push(new(tree.Paren)(e));
+                            } else {
+                                return null;
+                            }
+                        } else { return null }
+                    }
+                } while (e);
+
+                if (nodes.length > 0) {
+                    return new(tree.Expression)(nodes);
+                }
+            },
+
+            mediaFeatures: function () {
+                var e, features = [];
+
+                do {
+                  if (e = $(this.mediaFeature)) {
+                      features.push(e);
+                      if (! $(',')) { break }
+                  } else if (e = $(this.entities.variable)) {
+                      features.push(e);
+                      if (! $(',')) { break }
+                  }
+                } while (e);
+
+                return features.length > 0 ? features : null;
+            },
+
+            media: function () {
+                var features, rules, media, debugInfo;
+
+                if (env.dumpLineNumbers)
+                    debugInfo = getDebugInfo(i, input, env);
+
+                if ($(/^@media/)) {
+                    features = $(this.mediaFeatures);
+
+                    if (rules = $(this.block)) {
+                        media = new(tree.Media)(rules, features);
+                        if(env.dumpLineNumbers)
+                            media.debugInfo = debugInfo;
+                        return media;
+                    }
+                }
+            },
+
+            //
+            // A CSS Directive
+            //
+            //     @charset "utf-8";
+            //
+            directive: function () {
+                var name, value, rules, identifier, e, nodes, nonVendorSpecificName,
+                    hasBlock, hasIdentifier, hasExpression;
+
+                if (input.charAt(i) !== '@') return;
+
+                if (value = $(this['import']) || $(this.media)) {
+                    return value;
+                }
+                
+                save();
+
+                name = $(/^@[a-z-]+/);
+                
+                if (!name) return;
+
+                nonVendorSpecificName = name;
+                if (name.charAt(1) == '-' && name.indexOf('-', 2) > 0) {
+                    nonVendorSpecificName = "@" + name.slice(name.indexOf('-', 2) + 1);
+                }
+
+                switch(nonVendorSpecificName) {
+                    case "@font-face":
+                        hasBlock = true;
+                        break;
+                    case "@viewport":
+                    case "@top-left":
+                    case "@top-left-corner":
+                    case "@top-center":
+                    case "@top-right":
+                    case "@top-right-corner":
+                    case "@bottom-left":
+                    case "@bottom-left-corner":
+                    case "@bottom-center":
+                    case "@bottom-right":
+                    case "@bottom-right-corner":
+                    case "@left-top":
+                    case "@left-middle":
+                    case "@left-bottom":
+                    case "@right-top":
+                    case "@right-middle":
+                    case "@right-bottom":
+                        hasBlock = true;
+                        break;
+                    case "@page":
+                    case "@document":
+                    case "@supports":
+                    case "@keyframes":
+                        hasBlock = true;
+                        hasIdentifier = true;
+                        break;
+                    case "@namespace":
+                        hasExpression = true;
+                        break;
+                }
+
+                if (hasIdentifier) {
+                    name += " " + ($(/^[^{]+/) || '').trim();
+                }
+
+                if (hasBlock)
+                {
+                    if (rules = $(this.block)) {
+                        return new(tree.Directive)(name, rules);
+                    }
+                } else {
+                    if ((value = hasExpression ? $(this.expression) : $(this.entity)) && $(';')) {
+                        var directive = new(tree.Directive)(name, value);
+                        if (env.dumpLineNumbers) {
+                            directive.debugInfo = getDebugInfo(i, input, env);
+                        }
+                        return directive;
+                    }
+                }
+                
+                restore();
+            },
+            font: function () {
+                var value = [], expression = [], weight, shorthand, font, e;
+
+                while (e = $(this.shorthand) || $(this.entity)) {
+                    expression.push(e);
+                }
+                value.push(new(tree.Expression)(expression));
+
+                if ($(',')) {
+                    while (e = $(this.expression)) {
+                        value.push(e);
+                        if (! $(',')) { break }
+                    }
+                }
+                return new(tree.Value)(value);
+            },
+
+            //
+            // A Value is a comma-delimited list of Expressions
+            //
+            //     font-family: Baskerville, Georgia, serif;
+            //
+            // In a Rule, a Value represents everything after the `:`,
+            // and before the `;`.
+            //
+            value: function () {
+                var e, expressions = [], important;
+
+                while (e = $(this.expression)) {
+                    expressions.push(e);
+                    if (! $(',')) { break }
+                }
+
+                if (expressions.length > 0) {
+                    return new(tree.Value)(expressions);
+                }
+            },
+            important: function () {
+                if (input.charAt(i) === '!') {
+                    return $(/^! *important/);
+                }
+            },
+            sub: function () {
+                var e;
+
+                if ($('(') && (e = $(this.expression)) && $(')')) {
+                    return e;
+                }
+            },
+            multiplication: function () {
+                var m, a, op, operation;
+                if (m = $(this.operand)) {
+                    while (!peek(/^\/[*\/]/) && (op = ($('/') || $('*'))) && (a = $(this.operand))) {
+                        operation = new(tree.Operation)(op, [operation || m, a]);
+                    }
+                    return operation || m;
+                }
+            },
+            addition: function () {
+                var m, a, op, operation;
+                if (m = $(this.multiplication)) {
+                    while ((op = $(/^[-+]\s+/) || (!isWhitespace(input.charAt(i - 1)) && ($('+') || $('-')))) &&
+                           (a = $(this.multiplication))) {
+                        operation = new(tree.Operation)(op, [operation || m, a]);
+                    }
+                    return operation || m;
+                }
+            },
+            conditions: function () {
+                var a, b, index = i, condition;
+
+                if (a = $(this.condition)) {
+                    while ($(',') && (b = $(this.condition))) {
+                        condition = new(tree.Condition)('or', condition || a, b, index);
+                    }
+                    return condition || a;
+                }
+            },
+            condition: function () {
+                var a, b, c, op, index = i, negate = false;
+
+                if ($(/^not/)) { negate = true }
+                expect('(');
+                if (a = $(this.addition) || $(this.entities.keyword) || $(this.entities.quoted)) {
+                    if (op = $(/^(?:>=|=<|[<=>])/)) {
+                        if (b = $(this.addition) || $(this.entities.keyword) || $(this.entities.quoted)) {
+                            c = new(tree.Condition)(op, a, b, index, negate);
+                        } else {
+                            error('expected expression');
+                        }
+                    } else {
+                        c = new(tree.Condition)('=', a, new(tree.Keyword)('true'), index, negate);
+                    }
+                    expect(')');
+                    return $(/^and/) ? new(tree.Condition)('and', c, $(this.condition)) : c;
+                }
+            },
+
+            //
+            // An operand is anything that can be part of an operation,
+            // such as a Color, or a Variable
+            //
+            operand: function () {
+                var negate, p = input.charAt(i + 1);
+
+                if (input.charAt(i) === '-' && (p === '@' || p === '(')) { negate = $('-') }
+                var o = $(this.sub) || $(this.entities.dimension) ||
+                        $(this.entities.color) || $(this.entities.variable) ||
+                        $(this.entities.call);
+                return negate ? new(tree.Operation)('*', [new(tree.Dimension)(-1), o])
+                              : o;
+            },
+
+            //
+            // Expressions either represent mathematical operations,
+            // or white-space delimited Entities.
+            //
+            //     1px solid black
+            //     @var * 2
+            //
+            expression: function () {
+                var e, delim, entities = [], d;
+
+                while (e = $(this.addition) || $(this.entity)) {
+                    entities.push(e);
+                }
+                if (entities.length > 0) {
+                    return new(tree.Expression)(entities);
+                }
+            },
+            property: function () {
+                var name;
+
+                if (name = $(/^(\*?-?[_a-z0-9-]+)\s*:/)) {
+                    return name[1];
+                }
+            }
+        }
+    };
+};
+
+if (less.mode === 'browser' || less.mode === 'rhino') {
+    //
+    // Used by `@import` directives
+    //
+    less.Parser.importer = function (path, paths, callback, env) {
+        if (!/^([a-z-]+:)?\//.test(path) && paths.length > 0) {
+            path = paths[0] + path;
+        }
+        // We pass `true` as 3rd argument, to force the reload of the import.
+        // This is so we can get the syntax tree as opposed to just the CSS output,
+        // as we need this to evaluate the current stylesheet.
+        loadStyleSheet({ 
+            href: path, 
+            title: path, 
+            type: env.mime, 
+            contents: env.contents, 
+            files: env.files, 
+            rootpath: env.rootpath,
+            entryPath: env.entryPath,
+            relativeUrls: env.relativeUrls }, 
+        function (e, root, data, sheet, _, path) {
+            if (e && typeof(env.errback) === "function") {
+                env.errback.call(null, path, paths, callback, env);
+            } else {
+                callback.call(null, e, root, path);
+            }
+        }, true);
+    };
+}
+
+(function (tree) {
+
+tree.functions = {
+    rgb: function (r, g, b) {
+        return this.rgba(r, g, b, 1.0);
+    },
+    rgba: function (r, g, b, a) {
+        var rgb = [r, g, b].map(function (c) { return scaled(c, 256); });
+        a = number(a);
+        return new(tree.Color)(rgb, a);
+    },
+    hsl: function (h, s, l) {
+        return this.hsla(h, s, l, 1.0);
+    },
+    hsla: function (h, s, l, a) {
+        h = (number(h) % 360) / 360;
+        s = number(s); l = number(l); a = number(a);
+
+        var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
+        var m1 = l * 2 - m2;
+
+        return this.rgba(hue(h + 1/3) * 255,
+                         hue(h)       * 255,
+                         hue(h - 1/3) * 255,
+                         a);
+
+        function hue(h) {
+            h = h < 0 ? h + 1 : (h > 1 ? h - 1 : h);
+            if      (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
+            else if (h * 2 < 1) return m2;
+            else if (h * 3 < 2) return m1 + (m2 - m1) * (2/3 - h) * 6;
+            else                return m1;
+        }
+    },
+
+    hsv: function(h, s, v) {
+        return this.hsva(h, s, v, 1.0);
+    },
+
+    hsva: function(h, s, v, a) {
+        h = ((number(h) % 360) / 360) * 360;
+        s = number(s); v = number(v); a = number(a);
+
+        var i, f;
+        i = Math.floor((h / 60) % 6);
+        f = (h / 60) - i;
+
+        var vs = [v,
+                  v * (1 - s),
+                  v * (1 - f * s),
+                  v * (1 - (1 - f) * s)];
+        var perm = [[0, 3, 1],
+                    [2, 0, 1],
+                    [1, 0, 3],
+                    [1, 2, 0],
+                    [3, 1, 0],
+                    [0, 1, 2]];
+
+        return this.rgba(vs[perm[i][0]] * 255,
+                         vs[perm[i][1]] * 255,
+                         vs[perm[i][2]] * 255,
+                         a);
+    },
+
+    hue: function (color) {
+        return new(tree.Dimension)(Math.round(color.toHSL().h));
+    },
+    saturation: function (color) {
+        return new(tree.Dimension)(Math.round(color.toHSL().s * 100), '%');
+    },
+    lightness: function (color) {
+        return new(tree.Dimension)(Math.round(color.toHSL().l * 100), '%');
+    },
+    red: function (color) {
+        return new(tree.Dimension)(color.rgb[0]);
+    },
+    green: function (color) {
+        return new(tree.Dimension)(color.rgb[1]);
+    },
+    blue: function (color) {
+        return new(tree.Dimension)(color.rgb[2]);
+    },
+    alpha: function (color) {
+        return new(tree.Dimension)(color.toHSL().a);
+    },
+    luma: function (color) {
+        return new(tree.Dimension)(Math.round((0.2126 * (color.rgb[0]/255) +
+            0.7152 * (color.rgb[1]/255) +
+            0.0722 * (color.rgb[2]/255)) *
+            color.alpha * 100), '%');
+    },
+    saturate: function (color, amount) {
+        var hsl = color.toHSL();
+
+        hsl.s += amount.value / 100;
+        hsl.s = clamp(hsl.s);
+        return hsla(hsl);
+    },
+    desaturate: function (color, amount) {
+        var hsl = color.toHSL();
+
+        hsl.s -= amount.value / 100;
+        hsl.s = clamp(hsl.s);
+        return hsla(hsl);
+    },
+    lighten: function (color, amount) {
+        var hsl = color.toHSL();
+
+        hsl.l += amount.value / 100;
+        hsl.l = clamp(hsl.l);
+        return hsla(hsl);
+    },
+    darken: function (color, amount) {
+        var hsl = color.toHSL();
+
+        hsl.l -= amount.value / 100;
+        hsl.l = clamp(hsl.l);
+        return hsla(hsl);
+    },
+    fadein: function (color, amount) {
+        var hsl = color.toHSL();
+
+        hsl.a += amount.value / 100;
+        hsl.a = clamp(hsl.a);
+        return hsla(hsl);
+    },
+    fadeout: function (color, amount) {
+        var hsl = color.toHSL();
+
+        hsl.a -= amount.value / 100;
+        hsl.a = clamp(hsl.a);
+        return hsla(hsl);
+    },
+    fade: function (color, amount) {
+        var hsl = color.toHSL();
+
+        hsl.a = amount.value / 100;
+        hsl.a = clamp(hsl.a);
+        return hsla(hsl);
+    },
+    spin: function (color, amount) {
+        var hsl = color.toHSL();
+        var hue = (hsl.h + amount.value) % 360;
+
+        hsl.h = hue < 0 ? 360 + hue : hue;
+
+        return hsla(hsl);
+    },
+    //
+    // Copyright (c) 2006-2009 Hampton Catlin, Nathan Weizenbaum, and Chris Eppstein
+    // http://sass-lang.com
+    //
+    mix: function (color1, color2, weight) {
+        if (!weight) {
+            weight = new(tree.Dimension)(50);
+        }
+        var p = weight.value / 100.0;
+        var w = p * 2 - 1;
+        var a = color1.toHSL().a - color2.toHSL().a;
+
+        var w1 = (((w * a == -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
+        var w2 = 1 - w1;
+
+        var rgb = [color1.rgb[0] * w1 + color2.rgb[0] * w2,
+                   color1.rgb[1] * w1 + color2.rgb[1] * w2,
+                   color1.rgb[2] * w1 + color2.rgb[2] * w2];
+
+        var alpha = color1.alpha * p + color2.alpha * (1 - p);
+
+        return new(tree.Color)(rgb, alpha);
+    },
+    greyscale: function (color) {
+        return this.desaturate(color, new(tree.Dimension)(100));
+    },
+    contrast: function (color, dark, light, threshold) {
+        // filter: contrast(3.2);
+        // should be kept as is, so check for color
+        if (!color.rgb) {
+            return null;
+        }
+        if (typeof light === 'undefined') {
+            light = this.rgba(255, 255, 255, 1.0);
+        }
+        if (typeof dark === 'undefined') {
+            dark = this.rgba(0, 0, 0, 1.0);
+        }
+        if (typeof threshold === 'undefined') {
+            threshold = 0.43;
+        } else {
+            threshold = threshold.value;
+        }
+        if (((0.2126 * (color.rgb[0]/255) + 0.7152 * (color.rgb[1]/255) + 0.0722 * (color.rgb[2]/255)) * color.alpha) < threshold) {
+            return light;
+        } else {
+            return dark;
+        }
+    },
+    e: function (str) {
+        return new(tree.Anonymous)(str instanceof tree.JavaScript ? str.evaluated : str);
+    },
+    escape: function (str) {
+        return new(tree.Anonymous)(encodeURI(str.value).replace(/=/g, "%3D").replace(/:/g, "%3A").replace(/#/g, "%23").replace(/;/g, "%3B").replace(/\(/g, "%28").replace(/\)/g, "%29"));
+    },
+    '%': function (quoted /* arg, arg, ...*/) {
+        var args = Array.prototype.slice.call(arguments, 1),
+            str = quoted.value;
+
+        for (var i = 0; i < args.length; i++) {
+            str = str.replace(/%[sda]/i, function(token) {
+                var value = token.match(/s/i) ? args[i].value : args[i].toCSS();
+                return token.match(/[A-Z]$/) ? encodeURIComponent(value) : value;
+            });
+        }
+        str = str.replace(/%%/g, '%');
+        return new(tree.Quoted)('"' + str + '"', str);
+    },
+    unit: function (val, unit) {
+        return new(tree.Dimension)(val.value, unit ? unit.toCSS() : "");
+    },
+    round: function (n, f) {
+        var fraction = typeof(f) === "undefined" ? 0 : f.value;
+        return this._math(function(num) { return num.toFixed(fraction); }, n);
+    },
+    ceil: function (n) {
+        return this._math(Math.ceil, n);
+    },
+    floor: function (n) {
+        return this._math(Math.floor, n);
+    },
+    _math: function (fn, n) {
+        if (n instanceof tree.Dimension) {
+            return new(tree.Dimension)(fn(parseFloat(n.value)), n.unit);
+        } else if (typeof(n) === 'number') {
+            return fn(n);
+        } else {
+            throw { type: "Argument", message: "argument must be a number" };
+        }
+    },
+    argb: function (color) {
+        return new(tree.Anonymous)(color.toARGB());
+
+    },
+    percentage: function (n) {
+        return new(tree.Dimension)(n.value * 100, '%');
+    },
+    color: function (n) {
+        if (n instanceof tree.Quoted) {
+            return new(tree.Color)(n.value.slice(1));
+        } else {
+            throw { type: "Argument", message: "argument must be a string" };
+        }
+    },
+    iscolor: function (n) {
+        return this._isa(n, tree.Color);
+    },
+    isnumber: function (n) {
+        return this._isa(n, tree.Dimension);
+    },
+    isstring: function (n) {
+        return this._isa(n, tree.Quoted);
+    },
+    iskeyword: function (n) {
+        return this._isa(n, tree.Keyword);
+    },
+    isurl: function (n) {
+        return this._isa(n, tree.URL);
+    },
+    ispixel: function (n) {
+        return (n instanceof tree.Dimension) && n.unit === 'px' ? tree.True : tree.False;
+    },
+    ispercentage: function (n) {
+        return (n instanceof tree.Dimension) && n.unit === '%' ? tree.True : tree.False;
+    },
+    isem: function (n) {
+        return (n instanceof tree.Dimension) && n.unit === 'em' ? tree.True : tree.False;
+    },
+    _isa: function (n, Type) {
+        return (n instanceof Type) ? tree.True : tree.False;
+    },
+    
+    /* Blending modes */
+    
+    multiply: function(color1, color2) {
+        var r = color1.rgb[0] * color2.rgb[0] / 255;
+        var g = color1.rgb[1] * color2.rgb[1] / 255;
+        var b = color1.rgb[2] * color2.rgb[2] / 255;
+        return this.rgb(r, g, b);
+    },
+    screen: function(color1, color2) {
+        var r = 255 - (255 - color1.rgb[0]) * (255 - color2.rgb[0]) / 255;
+        var g = 255 - (255 - color1.rgb[1]) * (255 - color2.rgb[1]) / 255;
+        var b = 255 - (255 - color1.rgb[2]) * (255 - color2.rgb[2]) / 255;
+        return this.rgb(r, g, b);
+    },
+    overlay: function(color1, color2) {
+        var r = color1.rgb[0] < 128 ? 2 * color1.rgb[0] * color2.rgb[0] / 255 : 255 - 2 * (255 - color1.rgb[0]) * (255 - color2.rgb[0]) / 255;
+        var g = color1.rgb[1] < 128 ? 2 * color1.rgb[1] * color2.rgb[1] / 255 : 255 - 2 * (255 - color1.rgb[1]) * (255 - color2.rgb[1]) / 255;
+        var b = color1.rgb[2] < 128 ? 2 * color1.rgb[2] * color2.rgb[2] / 255 : 255 - 2 * (255 - color1.rgb[2]) * (255 - color2.rgb[2]) / 255;
+        return this.rgb(r, g, b);
+    },
+    softlight: function(color1, color2) {
+        var t = color2.rgb[0] * color1.rgb[0] / 255;
+        var r = t + color1.rgb[0] * (255 - (255 - color1.rgb[0]) * (255 - color2.rgb[0]) / 255 - t) / 255;
+        t = color2.rgb[1] * color1.rgb[1] / 255;
+        var g = t + color1.rgb[1] * (255 - (255 - color1.rgb[1]) * (255 - color2.rgb[1]) / 255 - t) / 255;
+        t = color2.rgb[2] * color1.rgb[2] / 255;
+        var b = t + color1.rgb[2] * (255 - (255 - color1.rgb[2]) * (255 - color2.rgb[2]) / 255 - t) / 255;
+        return this.rgb(r, g, b);
+    },
+    hardlight: function(color1, color2) {
+        var r = color2.rgb[0] < 128 ? 2 * color2.rgb[0] * color1.rgb[0] / 255 : 255 - 2 * (255 - color2.rgb[0]) * (255 - color1.rgb[0]) / 255;
+        var g = color2.rgb[1] < 128 ? 2 * color2.rgb[1] * color1.rgb[1] / 255 : 255 - 2 * (255 - color2.rgb[1]) * (255 - color1.rgb[1]) / 255;
+        var b = color2.rgb[2] < 128 ? 2 * color2.rgb[2] * color1.rgb[2] / 255 : 255 - 2 * (255 - color2.rgb[2]) * (255 - color1.rgb[2]) / 255;
+        return this.rgb(r, g, b);
+    },
+    difference: function(color1, color2) {
+        var r = Math.abs(color1.rgb[0] - color2.rgb[0]);
+        var g = Math.abs(color1.rgb[1] - color2.rgb[1]);
+        var b = Math.abs(color1.rgb[2] - color2.rgb[2]);
+        return this.rgb(r, g, b);
+    },
+    exclusion: function(color1, color2) {
+        var r = color1.rgb[0] + color2.rgb[0] * (255 - color1.rgb[0] - color1.rgb[0]) / 255;
+        var g = color1.rgb[1] + color2.rgb[1] * (255 - color1.rgb[1] - color1.rgb[1]) / 255;
+        var b = color1.rgb[2] + color2.rgb[2] * (255 - color1.rgb[2] - color1.rgb[2]) / 255;
+        return this.rgb(r, g, b);
+    },
+    average: function(color1, color2) {
+        var r = (color1.rgb[0] + color2.rgb[0]) / 2;
+        var g = (color1.rgb[1] + color2.rgb[1]) / 2;
+        var b = (color1.rgb[2] + color2.rgb[2]) / 2;
+        return this.rgb(r, g, b);
+    },
+    negation: function(color1, color2) {
+        var r = 255 - Math.abs(255 - color2.rgb[0] - color1.rgb[0]);
+        var g = 255 - Math.abs(255 - color2.rgb[1] - color1.rgb[1]);
+        var b = 255 - Math.abs(255 - color2.rgb[2] - color1.rgb[2]);
+        return this.rgb(r, g, b);
+    },
+    tint: function(color, amount) {
+        return this.mix(this.rgb(255,255,255), color, amount);
+    },
+    shade: function(color, amount) {
+        return this.mix(this.rgb(0, 0, 0), color, amount);
+    }
+};
+
+function hsla(color) {
+    return tree.functions.hsla(color.h, color.s, color.l, color.a);
+}
+
+function scaled(n, size) {
+    if (n instanceof tree.Dimension && n.unit == '%') {
+        return parseFloat(n.value * size / 100);
+    } else {
+        return number(n);
+    }
+}
+
+function number(n) {
+    if (n instanceof tree.Dimension) {
+        return parseFloat(n.unit == '%' ? n.value / 100 : n.value);
+    } else if (typeof(n) === 'number') {
+        return n;
+    } else {
+        throw {
+            error: "RuntimeError",
+            message: "color functions take numbers as parameters"
+        };
+    }
+}
+
+function clamp(val) {
+    return Math.min(1, Math.max(0, val));
+}
+
+})(require('./tree'));
+(function (tree) {
+    tree.colors = {
+        'aliceblue':'#f0f8ff',
+        'antiquewhite':'#faebd7',
+        'aqua':'#00ffff',
+        'aquamarine':'#7fffd4',
+        'azure':'#f0ffff',
+        'beige':'#f5f5dc',
+        'bisque':'#ffe4c4',
+        'black':'#000000',
+        'blanchedalmond':'#ffebcd',
+        'blue':'#0000ff',
+        'blueviolet':'#8a2be2',
+        'brown':'#a52a2a',
+        'burlywood':'#deb887',
+        'cadetblue':'#5f9ea0',
+        'chartreuse':'#7fff00',
+        'chocolate':'#d2691e',
+        'coral':'#ff7f50',
+        'cornflowerblue':'#6495ed',
+        'cornsilk':'#fff8dc',
+        'crimson':'#dc143c',
+        'cyan':'#00ffff',
+        'darkblue':'#00008b',
+        'darkcyan':'#008b8b',
+        'darkgoldenrod':'#b8860b',
+        'darkgray':'#a9a9a9',
+        'darkgrey':'#a9a9a9',
+        'darkgreen':'#006400',
+        'darkkhaki':'#bdb76b',
+        'darkmagenta':'#8b008b',
+        'darkolivegreen':'#556b2f',
+        'darkorange':'#ff8c00',
+        'darkorchid':'#9932cc',
+        'darkred':'#8b0000',
+        'darksalmon':'#e9967a',
+        'darkseagreen':'#8fbc8f',
+        'darkslateblue':'#483d8b',
+        'darkslategray':'#2f4f4f',
+        'darkslategrey':'#2f4f4f',
+        'darkturquoise':'#00ced1',
+        'darkviolet':'#9400d3',
+        'deeppink':'#ff1493',
+        'deepskyblue':'#00bfff',
+        'dimgray':'#696969',
+        'dimgrey':'#696969',
+        'dodgerblue':'#1e90ff',
+        'firebrick':'#b22222',
+        'floralwhite':'#fffaf0',
+        'forestgreen':'#228b22',
+        'fuchsia':'#ff00ff',
+        'gainsboro':'#dcdcdc',
+        'ghostwhite':'#f8f8ff',
+        'gold':'#ffd700',
+        'goldenrod':'#daa520',
+        'gray':'#808080',
+        'grey':'#808080',
+        'green':'#008000',
+        'greenyellow':'#adff2f',
+        'honeydew':'#f0fff0',
+        'hotpink':'#ff69b4',
+        'indianred':'#cd5c5c',
+        'indigo':'#4b0082',
+        'ivory':'#fffff0',
+        'khaki':'#f0e68c',
+        'lavender':'#e6e6fa',
+        'lavenderblush':'#fff0f5',
+        'lawngreen':'#7cfc00',
+        'lemonchiffon':'#fffacd',
+        'lightblue':'#add8e6',
+        'lightcoral':'#f08080',
+        'lightcyan':'#e0ffff',
+        'lightgoldenrodyellow':'#fafad2',
+        'lightgray':'#d3d3d3',
+        'lightgrey':'#d3d3d3',
+        'lightgreen':'#90ee90',
+        'lightpink':'#ffb6c1',
+        'lightsalmon':'#ffa07a',
+        'lightseagreen':'#20b2aa',
+        'lightskyblue':'#87cefa',
+        'lightslategray':'#778899',
+        'lightslategrey':'#778899',
+        'lightsteelblue':'#b0c4de',
+        'lightyellow':'#ffffe0',
+        'lime':'#00ff00',
+        'limegreen':'#32cd32',
+        'linen':'#faf0e6',
+        'magenta':'#ff00ff',
+        'maroon':'#800000',
+        'mediumaquamarine':'#66cdaa',
+        'mediumblue':'#0000cd',
+        'mediumorchid':'#ba55d3',
+        'mediumpurple':'#9370d8',
+        'mediumseagreen':'#3cb371',
+        'mediumslateblue':'#7b68ee',
+        'mediumspringgreen':'#00fa9a',
+        'mediumturquoise':'#48d1cc',
+        'mediumvioletred':'#c71585',
+        'midnightblue':'#191970',
+        'mintcream':'#f5fffa',
+        'mistyrose':'#ffe4e1',
+        'moccasin':'#ffe4b5',
+        'navajowhite':'#ffdead',
+        'navy':'#000080',
+        'oldlace':'#fdf5e6',
+        'olive':'#808000',
+        'olivedrab':'#6b8e23',
+        'orange':'#ffa500',
+        'orangered':'#ff4500',
+        'orchid':'#da70d6',
+        'palegoldenrod':'#eee8aa',
+        'palegreen':'#98fb98',
+        'paleturquoise':'#afeeee',
+        'palevioletred':'#d87093',
+        'papayawhip':'#ffefd5',
+        'peachpuff':'#ffdab9',
+        'peru':'#cd853f',
+        'pink':'#ffc0cb',
+        'plum':'#dda0dd',
+        'powderblue':'#b0e0e6',
+        'purple':'#800080',
+        'red':'#ff0000',
+        'rosybrown':'#bc8f8f',
+        'royalblue':'#4169e1',
+        'saddlebrown':'#8b4513',
+        'salmon':'#fa8072',
+        'sandybrown':'#f4a460',
+        'seagreen':'#2e8b57',
+        'seashell':'#fff5ee',
+        'sienna':'#a0522d',
+        'silver':'#c0c0c0',
+        'skyblue':'#87ceeb',
+        'slateblue':'#6a5acd',
+        'slategray':'#708090',
+        'slategrey':'#708090',
+        'snow':'#fffafa',
+        'springgreen':'#00ff7f',
+        'steelblue':'#4682b4',
+        'tan':'#d2b48c',
+        'teal':'#008080',
+        'thistle':'#d8bfd8',
+        'tomato':'#ff6347',
+        // 'transparent':'rgba(0,0,0,0)',
+        'turquoise':'#40e0d0',
+        'violet':'#ee82ee',
+        'wheat':'#f5deb3',
+        'white':'#ffffff',
+        'whitesmoke':'#f5f5f5',
+        'yellow':'#ffff00',
+        'yellowgreen':'#9acd32'
+    };
+})(require('./tree'));
+(function (tree) {
+
+tree.Alpha = function (val) {
+    this.value = val;
+};
+tree.Alpha.prototype = {
+    toCSS: function () {
+        return "alpha(opacity=" +
+               (this.value.toCSS ? this.value.toCSS() : this.value) + ")";
+    },
+    eval: function (env) {
+        if (this.value.eval) { this.value = this.value.eval(env) }
+        return this;
+    }
+};
+
+})(require('../tree'));
+(function (tree) {
+
+tree.Anonymous = function (string) {
+    this.value = string.value || string;
+};
+tree.Anonymous.prototype = {
+    toCSS: function () {
+        return this.value;
+    },
+    eval: function () { return this },
+    compare: function (x) {
+        if (!x.toCSS) {
+            return -1;
+        }
+        
+        var left = this.toCSS(),
+            right = x.toCSS();
+        
+        if (left === right) {
+            return 0;
+        }
+        
+        return left < right ? -1 : 1;
+    }
+};
+
+})(require('../tree'));
+(function (tree) {
+
+tree.Assignment = function (key, val) {
+    this.key = key;
+    this.value = val;
+};
+tree.Assignment.prototype = {
+    toCSS: function () {
+        return this.key + '=' + (this.value.toCSS ? this.value.toCSS() : this.value);
+    },
+    eval: function (env) {
+        if (this.value.eval) {
+            return new(tree.Assignment)(this.key, this.value.eval(env));
+        }
+        return this;
+    }
+};
+
+})(require('../tree'));(function (tree) {
+
+//
+// A function call node.
+//
+tree.Call = function (name, args, index, filename) {
+    this.name = name;
+    this.args = args;
+    this.index = index;
+    this.filename = filename;
+};
+tree.Call.prototype = {
+    //
+    // When evaluating a function call,
+    // we either find the function in `tree.functions` [1],
+    // in which case we call it, passing the  evaluated arguments,
+    // if this returns null or we cannot find the function, we 
+    // simply print it out as it appeared originally [2].
+    //
+    // The *functions.js* file contains the built-in functions.
+    //
+    // The reason why we evaluate the arguments, is in the case where
+    // we try to pass a variable to a function, like: `saturate(@color)`.
+    // The function should receive the value, not the variable.
+    //
+    eval: function (env) {
+        var args = this.args.map(function (a) { return a.eval(env) }),
+            result;
+
+        if (this.name in tree.functions) { // 1.
+            try {
+                result = tree.functions[this.name].apply(tree.functions, args);
+                if (result != null) {
+                    return result;
+                }
+            } catch (e) {
+                throw { type: e.type || "Runtime",
+                        message: "error evaluating function `" + this.name + "`" +
+                                 (e.message ? ': ' + e.message : ''),
+                        index: this.index, filename: this.filename };
+            }
+        }
+        
+        // 2.
+        return new(tree.Anonymous)(this.name +
+            "(" + args.map(function (a) { return a.toCSS(env) }).join(', ') + ")");
+    },
+
+    toCSS: function (env) {
+        return this.eval(env).toCSS();
+    }
+};
+
+})(require('../tree'));
+(function (tree) {
+//
+// RGB Colors - #ff0014, #eee
+//
+tree.Color = function (rgb, a) {
+    //
+    // The end goal here, is to parse the arguments
+    // into an integer triplet, such as `128, 255, 0`
+    //
+    // This facilitates operations and conversions.
+    //
+    if (Array.isArray(rgb)) {
+        this.rgb = rgb;
+    } else if (rgb.length == 6) {
+        this.rgb = rgb.match(/.{2}/g).map(function (c) {
+            return parseInt(c, 16);
+        });
+    } else {
+        this.rgb = rgb.split('').map(function (c) {
+            return parseInt(c + c, 16);
+        });
+    }
+    this.alpha = typeof(a) === 'number' ? a : 1;
+};
+tree.Color.prototype = {
+    eval: function () { return this },
+
+    //
+    // If we have some transparency, the only way to represent it
+    // is via `rgba`. Otherwise, we use the hex representation,
+    // which has better compatibility with older browsers.
+    // Values are capped between `0` and `255`, rounded and zero-padded.
+    //
+    toCSS: function () {
+        if (this.alpha < 1.0) {
+            return "rgba(" + this.rgb.map(function (c) {
+                return Math.round(c);
+            }).concat(this.alpha).join(', ') + ")";
+        } else {
+            return '#' + this.rgb.map(function (i) {
+                i = Math.round(i);
+                i = (i > 255 ? 255 : (i < 0 ? 0 : i)).toString(16);
+                return i.length === 1 ? '0' + i : i;
+            }).join('');
+        }
+    },
+
+    //
+    // Operations have to be done per-channel, if not,
+    // channels will spill onto each other. Once we have
+    // our result, in the form of an integer triplet,
+    // we create a new Color node to hold the result.
+    //
+    operate: function (op, other) {
+        var result = [];
+
+        if (! (other instanceof tree.Color)) {
+            other = other.toColor();
+        }
+
+        for (var c = 0; c < 3; c++) {
+            result[c] = tree.operate(op, this.rgb[c], other.rgb[c]);
+        }
+        return new(tree.Color)(result, this.alpha + other.alpha);
+    },
+
+    toHSL: function () {
+        var r = this.rgb[0] / 255,
+            g = this.rgb[1] / 255,
+            b = this.rgb[2] / 255,
+            a = this.alpha;
+
+        var max = Math.max(r, g, b), min = Math.min(r, g, b);
+        var h, s, l = (max + min) / 2, d = max - min;
+
+        if (max === min) {
+            h = s = 0;
+        } else {
+            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
+
+            switch (max) {
+                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
+                case g: h = (b - r) / d + 2;               break;
+                case b: h = (r - g) / d + 4;               break;
+            }
+            h /= 6;
+        }
+        return { h: h * 360, s: s, l: l, a: a };
+    },
+    toARGB: function () {
+        var argb = [Math.round(this.alpha * 255)].concat(this.rgb);
+        return '#' + argb.map(function (i) {
+            i = Math.round(i);
+            i = (i > 255 ? 255 : (i < 0 ? 0 : i)).toString(16);
+            return i.length === 1 ? '0' + i : i;
+        }).join('');
+    },
+    compare: function (x) {
+        if (!x.rgb) {
+            return -1;
+        }
+        
+        return (x.rgb[0] === this.rgb[0] &&
+            x.rgb[1] === this.rgb[1] &&
+            x.rgb[2] === this.rgb[2] &&
+            x.alpha === this.alpha) ? 0 : -1;
+    }
+};
+
+
+})(require('../tree'));
+(function (tree) {
+
+tree.Comment = function (value, silent) {
+    this.value = value;
+    this.silent = !!silent;
+};
+tree.Comment.prototype = {
+    toCSS: function (env) {
+        return env.compress ? '' : this.value;
+    },
+    eval: function () { return this }
+};
+
+})(require('../tree'));
+(function (tree) {
+
+tree.Condition = function (op, l, r, i, negate) {
+    this.op = op.trim();
+    this.lvalue = l;
+    this.rvalue = r;
+    this.index = i;
+    this.negate = negate;
+};
+tree.Condition.prototype.eval = function (env) {
+    var a = this.lvalue.eval(env),
+        b = this.rvalue.eval(env);
+
+    v

<TRUNCATED>

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