added the typeof operater as an OpNode

lib/coffee_script/grammar.y

@@ -10,7 +10,7 @@ token TRY CATCH FINALLY THROW
 token BREAK CONTINUE
 token FOR IN WHILE
 token SWITCH WHEN
-token DELETE INSTANCEOF
+token DELETE INSTANCEOF TYPEOF
 token SUPER
 token NEWLINE
 token COMMENT
@@ -27,7 +27,7 @@ prechigh
   right    '==' '!=' IS AINT
   left     '&&' '||' AND OR
   right    '-=' '+=' '/=' '*='
-  right    DELETE INSTANCEOF
+  right    DELETE INSTANCEOF TYPEOF
   left     "."
   right    THROW FOR IN WHILE NEW
   left     UNLESS IF ELSE
@@ -185,6 +185,7 @@ rule
   | Expression '&&:' Expression       { result = OpNode.new(val[1], val[0], val[2]) }
 
   | DELETE Expression                 { result = OpNode.new(val[0], val[1]) }
+  | TYPEOF Expression                 { result = OpNode.new(val[0], val[1]) }
   | Expression INSTANCEOF Expression  { result = OpNode.new(val[1], val[0], val[2]) }
   ;
 

lib/coffee_script/lexer.rb

@@ -15,7 +15,7 @@ module CoffeeScript
                   "for", "in", "while",
                   "switch", "when",
                   "super",
-                  "delete", "instanceof"]
+                  "delete", "instanceof", "typeof"]
 
     # Token matching regexes.
     IDENTIFIER = /\A([a-zA-Z$_]\w*)/

lib/coffee_script/nodes.rb

@@ -343,6 +343,7 @@ module CoffeeScript
       'not'   => '!',
     }
     CONDITIONALS     = ['||:', '&&:']
+    PREFIX_OPERATORS = ['typeof', 'delete']
 
     attr_reader :operator, :first, :second
 
@@ -369,7 +370,7 @@ module CoffeeScript
     end
 
     def compile_unary(o)
-      space = @operator.to_s == 'delete' ? ' ' : ''
+      space = PREFIX_OPERATORS.include?(@operator.to_s) ? ' ' : ''
       parts = [@operator.to_s, space, @first.compile(o)]
       parts.reverse! if @flip
       parts.join('')

test/fixtures/execution/keyword_operators.cs

@@ -1,10 +1,10 @@
 a: 5
-atype: typeof(a)
+atype: typeof a
 
 b: "hello"
-btype: typeof(b)
+btype: typeof b
 
 Klass: => .
 k: new Klass()
 
-print(atype is 'number' and btype is 'string' and k instanceof(Klass))
+print(atype is 'number' and btype is 'string' and k instanceof Klass)

test/fixtures/execution/keyword_operators.js

@@ -1,8 +1,8 @@
 (function(){
   var a = 5;
-  var atype = typeof(a);
+  var atype = typeof a;
   var b = "hello";
-  var btype = typeof(b);
+  var btype = typeof b;
   var Klass = function() {
   };
   var k = new Klass();