Allowing @[property] syntax.

lib/grammar.js

@@ -343,6 +343,8 @@
         return new ValueNode(new LiteralNode('this'));
       }), o("@ Identifier", function() {
         return new ValueNode(new LiteralNode('this'), [new AccessorNode($2)]);
+      }), o("@ Index", function() {
+        return new ValueNode(new LiteralNode('this'), [$2]);
       })
     ],
     // The range literal.

lib/lexer.js

@@ -49,7 +49,7 @@
   // See: http://www.mozilla.org/js/language/js20-2002-04/rationale/syntax.html#regular-expressions
   NOT_REGEX = ['IDENTIFIER', 'NUMBER', 'REGEX', 'STRING', ')', '++', '--', ']', '}', 'FALSE', 'NULL', 'TRUE'];
   // Tokens which could legitimately be invoked or indexed.
-  CALLABLE = ['IDENTIFIER', 'SUPER', ')', ']', '}', 'STRING'];
+  CALLABLE = ['IDENTIFIER', 'SUPER', ')', ']', '}', 'STRING', '@'];
   // Tokens that indicate an access -- keywords immediately following will be
   // treated as identifiers.
   ACCESSORS = ['PROPERTY_ACCESS', 'PROTOTYPE_ACCESS', 'SOAK_ACCESS', '@'];

src/grammar.coffee

@@ -300,6 +300,7 @@ grammar: {
   This: [
     o "@",                                      -> new ValueNode(new LiteralNode('this'))
     o "@ Identifier",                           -> new ValueNode(new LiteralNode('this'), [new AccessorNode($2)])
+    o "@ Index",                                -> new ValueNode(new LiteralNode('this'), [$2])
   ]
 
   # The range literal.

src/lexer.coffee

@@ -78,7 +78,7 @@ NOT_REGEX: [
 ]
 
 # Tokens which could legitimately be invoked or indexed.
-CALLABLE: ['IDENTIFIER', 'SUPER', ')', ']', '}', 'STRING']
+CALLABLE: ['IDENTIFIER', 'SUPER', ')', ']', '}', 'STRING', '@']
 
 # Tokens that indicate an access -- keywords immediately following will be
 # treated as identifiers.

test/test_literals.coffee

@@ -45,7 +45,7 @@ bob: {
   greet: (salutation) ->
     salutation + " " + @name
   hello: ->
-    @greet "Hello"
+    @['greet'] "Hello"
   10: 'number'
 }