moved @media code to own file

lib/less/index.js

@@ -82,7 +82,8 @@ var less = {
  'selector',   'quoted',     'expression', 'rule',
  'call',       'url',        'alpha',      'import',
  'mixin',      'comment',    'anonymous',  'value',
- 'javascript', 'assignment', 'condition',  'paren'
+ 'javascript', 'assignment', 'condition',  'paren',
+ 'media'
 ].forEach(function (n) {
     require('./tree/' + n);
 });

lib/less/parser.js

@@ -1089,7 +1089,7 @@ less.Parser = function Parser(env) {
                     features = $(this.mediaFeatures);
 
                     if (rules = $(this.block)) {
-                        return new(tree.Directive)('@media', rules, features);
+                        return new(tree.Media)(rules, features);
                     }
                 }
             },

lib/less/tree/media.js

@@ -0,0 +1,41 @@
+(function (tree) {
+
+tree.Media = function (value, features) {
+    var selectors;
+
+    this.features = features && new(tree.Value)(features);
+
+    if (Array.isArray(value)) {
+        selectors = [new(tree.Selector)([new(tree.Element)('&', null, 0)])];
+        this.ruleset = new(tree.Ruleset)(selectors, value);
+        this.ruleset.allowImports = true;
+    } else {
+        this.value = value;
+    }
+};
+tree.Media.prototype = {
+    toCSS: function (ctx, env) {
+        var features = this.features ? ' ' + this.features.toCSS(env) : '';
+
+        if (this.ruleset) {
+            this.ruleset.root = (ctx.length === 0);
+            return '@media' + features + (env.compress ? '{' : ' {\n  ') +
+                   this.ruleset.toCSS(ctx, env).trim().replace(/\n/g, '\n  ') +
+                               (env.compress ? '}': '\n}\n');
+        } else {
+            return '@media ' + this.value.toCSS() + ';\n';
+        }
+    },
+    eval: function (env) {
+        this.features = this.features && this.features.eval(env);
+        env.frames.unshift(this);
+        this.ruleset = this.ruleset && this.ruleset.eval(env);
+        env.frames.shift();
+        return this;
+    },
+    variable: function (name) { return tree.Ruleset.prototype.variable.call(this.ruleset, name) },
+    find: function () { return tree.Ruleset.prototype.find.apply(this.ruleset, arguments) },
+    rulesets: function () { return tree.Ruleset.prototype.rulesets.apply(this.ruleset) }
+};
+
+})(require('../tree'));

lib/less/tree/ruleset.js

@@ -130,7 +130,7 @@ tree.Ruleset.prototype = {
         for (var i = 0; i < this.rules.length; i++) {
             rule = this.rules[i];
 
-            if (rule.rules || (rule instanceof tree.Directive)) {
+            if (rule.rules || (rule instanceof tree.Directive) || (rule instanceof tree.Media)) {
                 rulesets.push(rule.toCSS(paths, env));
             } else if (rule instanceof tree.Comment) {
                 if (!rule.silent) {