added the 'delete' operator

examples/code.cs

@@ -147,4 +147,7 @@ a_googol: 1e100
 
 hex: 0xff0000
 
-negative: -1.0
+negative: -1.0
+
+# Deleting.
+delete secret.identity

lib/coffee_script/grammar.y

@@ -11,6 +11,7 @@ token BREAK CONTINUE
 token FOR IN WHILE
 token SWITCH CASE
 token SUPER
+token DELETE
 token NEWLINE
 token JS
 
@@ -24,6 +25,7 @@ prechigh
   left     '&&' '||' AND OR
   left     ':'
   right    '-=' '+=' '/=' '*=' '||=' '&&='
+  right    DELETE
   right    RETURN THROW FOR WHILE
   left     UNLESS
   nonassoc IF
@@ -116,7 +118,6 @@ rule
   | '-' Expression = UMINUS           { result = OpNode.new(val[0], val[1]) }
   | NOT Expression                    { result = OpNode.new(val[0], val[1]) }
 
-
   | Expression '*' Expression         { result = OpNode.new(val[1], val[0], val[2]) }
   | Expression '/' Expression         { result = OpNode.new(val[1], val[0], val[2]) }
   | Expression '%' Expression         { result = OpNode.new(val[1], val[0], val[2]) }
@@ -145,6 +146,8 @@ rule
   | Expression '*=' Expression        { result = OpNode.new(val[1], val[0], val[2]) }
   | Expression '||=' Expression       { result = OpNode.new(val[1], val[0], val[2]) }
   | Expression '&&=' Expression       { result = OpNode.new(val[1], val[0], val[2]) }
+
+  | DELETE Expression                 { result = OpNode.new(val[0], val[1]) }
   ;
 
 

lib/coffee_script/lexer.rb

@@ -8,7 +8,8 @@ class Lexer
                 "break", "continue",
                 "for", "in", "while",
                 "switch", "case",
-                "super"]
+                "super",
+                "delete"]
 
   IDENTIFIER = /\A([a-zA-Z$_]\w*)/
   NUMBER     = /\A\b((0(x|X)[0-9a-fA-F]+)|([0-9]+(\.[0-9]+)?(e[+\-]?[0-9]+)?))\b/i

lib/coffee_script/nodes.rb

@@ -252,7 +252,8 @@ class OpNode < Node
   end
 
   def compile_unary(indent, scope)
-    "#{@operator}#{@first.compile(indent, scope)}"
+    space = @operator == 'delete' ? ' ' : ''
+    "#{@operator}#{space}#{@first.compile(indent, scope)}"
   end
 end