Catch syntax errors. Also, don't let comment regex make weird behavior. Also, only let error() record, never let it throw.

files/demo.mss

@@ -1,19 +1,10 @@
+@red: #fff;
+
 #world {
-  polygon-fill:#CCC;
+  polygon-fill: @red;
+  text-face-name: 'Arial', 'Verdana';
 }
 
-#world[NAME='United States'] {
-  polygon-fill:#F00;
+#countries {
+  text-face-name: 'Arial', 'Verdana', 'Helvetica';
 }
-
-#countries .countries .two {
-  polygon-fill:#0FF;
-}
-
-#countries, #world {
-  polygon-fill:#F0F;
-  polygon-opacity: 0.5;
-}
-
-
-#countries, #countries.foo.bar.baz {}

lib/mess/parser.js

@@ -220,7 +220,8 @@ mess.Parser = function Parser(env) {
             chunks = (function(chunks) {
                 var j = 0,
                     skip = /[^"'`\{\}\/]+/g,
-                    comment = /\/\*(?:[^*]|\*+[^\/*])*(?:\*+\/\n?|\**$)|\/\/.*/g,
+                    // comment = /\/\*(?:[^*]|\*+[^\/*])*(?:\*+\/\n?|\**$)|\/\/.*/g,
+                    comment = /\/\*(?:[^*]|\*+[^\/*])*\*+\/|\/\/.*/g,
                     level = 0,
                     match,
                     chunk = chunks[0],
@@ -293,6 +294,10 @@ mess.Parser = function Parser(env) {
 
                 // return function(options, variables) {
                 return function(env) {
+                    env.error = function(e) {
+                        if (!env.errors) env.errors = [];
+                        env.errors.push(e);
+                    };
                     env.errors = [];
                     env.frames = env.frames || [];
 
@@ -446,7 +451,8 @@ mess.Parser = function Parser(env) {
 
                 if (input.charAt(i + 1) === '/') {
                     return new tree.Comment($(/^\/\/.*/), true);
-                } else if (comment = $(/^\/\*(?:[^*]|\*+[^\/*])*(?:\*+\/\n?|\**$)/)) {
+                } else if (comment = $(/^\/\*(?:[^*]|\*+[^\/*])*\*+\/\n?/)) {
+                // } else if (comment = $(/^\/\*(?:[^*]|\*+[^\/*])*(?:\*+\/\n?|\**$)/)) {
                     return new tree.Comment(comment);
                 }
             },

lib/mess/tree/definition.js

@@ -78,17 +78,6 @@ tree.Definition.prototype.toXML = function(env) {
         sym = sym[0];
     }
 
-    if (env.returnErrors) {
-        env.error = function(e) {
-            if (env.errors) {
-                env.errors.push(e);
-            }
-            else {
-                throw e;
-            }
-        };
-    }
-
     var symname = sym.charAt(0).toUpperCase()
         + sym.slice(1).replace(/\-./, function(str) {
         return str[1].toUpperCase();

lib/mess/tree/invalid.js

@@ -5,14 +5,6 @@ var sys = require('sys');
 tree.Invalid = function (chunk, index) {
     this.chunk = chunk;
     this.index = index;
+    this.message = "Invalid code: " + this.chunk;
 };
-tree.Invalid.prototype = {
-    toCSS: function (env) {
-        return env.error({
-            message: "Invalid code: " + sys.inspect(this.chunk),
-            index: this.index
-        });
-    }
-};
-
 })(require('mess/tree'));

lib/mess/tree/ruleset.js

@@ -147,6 +147,8 @@ tree.Ruleset.prototype = {
                 rule.flatten(result, selectors, env);
             } else if (rule instanceof tree.Rule) {
                 rules.push(rule);
+            } else if (rule instanceof tree.Invalid) {
+                env.errors.push(rule);
             }
         }