From ae58e2ec6ce3c27e6cf39233cdba5966cd5f1af1 Mon Sep 17 00:00:00 2001
From: Jeremy Ashkenas <jashkenas@gmail.com>
Date: Sat, 9 Jan 2010 11:51:32 -0500
Subject: [PATCH] adding body-less while expressions

---
 examples/poignant.coffee    | 6 +++---
 lib/coffee_script/grammar.y | 1 +
 lib/coffee_script/nodes.rb  | 1 +
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/examples/poignant.coffee b/examples/poignant.coffee
index 9714c980..9ed24328 100644
--- a/examples/poignant.coffee
+++ b/examples/poignant.coffee
@@ -14,9 +14,9 @@
 # end
 
 LotteryTicket: {
-  get_picks:    => this.picks
-  set_picks:    nums => this.picks: nums
-  get_purchase: => this.purchase
+  get_picks:           => this.picks
+  set_picks:      nums => this.picks: nums
+  get_purchase:        => this.purchase
   set_purchase: amount => this.purchase: amount
 }
 
diff --git a/lib/coffee_script/grammar.y b/lib/coffee_script/grammar.y
index ea3845ee..7c2ee5bb 100644
--- a/lib/coffee_script/grammar.y
+++ b/lib/coffee_script/grammar.y
@@ -340,6 +340,7 @@ rule
   # The while loop. (there is no do..while).
   While:
     WHILE Expression Block            { result = WhileNode.new(val[1], val[2]) }
+  | WHILE Expression                  { result = WhileNode.new(val[1], nil) }
   ;
 
   # Array comprehensions, including guard and current index.
diff --git a/lib/coffee_script/nodes.rb b/lib/coffee_script/nodes.rb
index ce7275ca..1419ff2f 100644
--- a/lib/coffee_script/nodes.rb
+++ b/lib/coffee_script/nodes.rb
@@ -609,6 +609,7 @@ module CoffeeScript
       o[:top]     = true
       cond        = @condition.compile(o)
       post        = returns ? "\n#{idt}return null;" : ''
+      return write("#{idt}while (#{cond});#{post}") if @body.nil?
       write("#{idt}while (#{cond}) {\n#{@body.compile(o)}\n#{idt}}#{post}")
     end
   end