Convert forloop hash to drop

lib/liquid/forloop_drop.rb

@@ -0,0 +1,42 @@
+module Liquid
+  class ForloopDrop < Drop
+    def initialize(name, length, parentloop)
+      @name = name
+      @length = length
+      @parentloop = parentloop
+      @index = 0
+    end
+
+    attr_reader :name, :length, :parentloop
+
+    def index
+      @index + 1
+    end
+
+    def index0
+      @index
+    end
+
+    def rindex
+      @length - @index
+    end
+
+    def rindex0
+      @length - @index - 1
+    end
+
+    def first
+      @index == 0
+    end
+
+    def last
+      @index == @length - 1
+    end
+
+    protected
+
+    def increment!
+      @index += 1
+    end
+  end
+end