got comments within object and array literals working out

lib/coffee_script/grammar.y

@@ -118,6 +118,7 @@ rule
   # Assignment within an object literal.
   AssignObj:
     IDENTIFIER ":" Expression         { result = AssignNode.new(val[0], val[2], :object) }
+  | Comment                           { result = val[0] }
   ;
 
   # A return statement.

lib/coffee_script/lexer.rb

@@ -32,7 +32,7 @@ module CoffeeScript
     # Token cleaning regexes.
     JS_CLEANER = /(\A`|`\Z)/
     MULTILINER = /\n/
-    COMMENT_CLEANER = /^\s*#/
+    COMMENT_CLEANER = /(^\s*#|\n\s*$)/
 
     # Tokens that always constitute the start of an expression.
     EXP_START  = ['{', '(', '[']

lib/coffee_script/nodes.rb

@@ -423,7 +423,10 @@ module CoffeeScript
       o = super(o)
       indent = o[:indent]
       o[:indent] += TAB
-      props = @properties.map {|p| o[:indent] + p.compile(o) }.join(",\n")
+      props = @properties.map { |prop|
+        joiner = prop == @properties.last ? '' : prop.is_a?(CommentNode) ? "\n" : ",\n"
+        o[:indent] + prop.compile(o) + joiner
+      }.join('')
       write("{\n#{props}\n#{indent}}")
     end
   end
@@ -438,8 +441,12 @@ module CoffeeScript
 
     def compile(o={})
       o = super(o)
-      objects = @objects.map {|obj| obj.compile(o) }.join(', ')
-      write("[#{objects}]")
+      objects = @objects.map { |obj|
+        joiner = obj.is_a?(CommentNode) ? "\n#{o[:indent] + TAB}" : obj == @objects.last ? '' : ', '
+        obj.compile(o.merge(:indent => o[:indent] + TAB)) + joiner
+      }.join('')
+      ending = objects.include?("\n") ? "\n#{o[:indent]}]" : ']'
+      write("[#{objects}#{ending}")
     end
   end
 

test/fixtures/inner_comments.cs

@@ -0,0 +1,15 @@
+object: {
+  a: 1
+  # Comments between the elements.
+  b: 2
+  # Like this.
+  c: 3
+}
+
+array: [
+  1
+  # Comments between the elements.
+  2
+  # Like this.
+  3
+]

test/fixtures/inner_comments.js

@@ -0,0 +1,15 @@
+(function(){
+  var object = {
+    a: 1,
+    // Comments between the elements.
+    b: 2,
+    // Like this.
+    c: 3
+  };
+  var array = [1,
+    // Comments between the elements.
+    2,
+    // Like this.
+    3
+  ];
+})();

test/unit/test_parser.rb

@@ -57,6 +57,11 @@ class ParserTest < Test::Unit::TestCase
     assert nodes[1].is_a? CommentNode
   end
 
+  def test_parsing_inner_comments
+    nodes = @par.parse(File.read('test/fixtures/inner_comments.cs'))
+    assert nodes.compile == File.read('test/fixtures/inner_comments.js')
+  end
+
   def test_parsing
     nodes = @par.parse(File.read('test/fixtures/each.cs'))
     assign = nodes.expressions[1]