Merge pull request #3 from robrix/this-expressions

`this` expressions

Author: Max Brunsfeld

grammar.coffee

@@ -199,6 +199,7 @@ module.exports = grammar
       @type_op,
       @_paren_expression,
 
+      @this_expression,
       @identifier,
       @number,
       @string,
@@ -322,6 +323,8 @@ module.exports = grammar
         /\d+/,
         optional(seq(".", /\d*/)))))
 
+    this_expression: -> "this"
+
     identifier: -> /[\a_$][\a\d_$]*/
 
     true: -> "true"

grammar_test/expressions.txt

@@ -49,6 +49,7 @@ $_;
 Booleans
 ============================================
 
+this;
 null;
 undefined;
 true;
@@ -57,6 +58,7 @@ false;
 ---
 
 (program
+  (expression_statement (this_expression))
   (expression_statement (null))
   (expression_statement (undefined))
   (expression_statement (true))
@@ -190,7 +192,7 @@ return this.map(function (a) {
   (function_call
     (member_access
       (function_call
-        (member_access (identifier) (identifier))
+        (member_access (this_expression) (identifier))
         (arguments
           (function (formal_parameters (identifier)) (statement_block
             (return_statement (member_access (identifier) (identifier)))))))