add yard tags

lib/liquid/forloop_drop.rb

@@ -1,6 +1,11 @@
 # frozen_string_literal: true
 
 module Liquid
+  # @liquid_public_docs
+  # @liquid_type object
+  # @liquid_name forloop
+  # @liquid_summary
+  #   The `forloop` object contains information about a parent [`for` loop](/api/liquid/tags#for).
   class ForloopDrop < Drop
     def initialize(name, length, parentloop)
       @name       = name
@@ -9,33 +14,64 @@ module Liquid
       @index      = 0
     end
 
-    attr_reader :length, :parentloop
+    # @liquid_public_docs
+    # @liquid_name forloop.length
+    # @liquid_summary
+    #   The number of iterations.
+    # @liquid_return [number]
+    attr_reader :length
+
+    attr_reader :parentloop
 
     def name
       Usage.increment('forloop_drop_name')
       @name
     end
 
+    # @liquid_public_docs
+    # @liquid_summary
+    #   The 1-based index of the current iteration.
+    # @liquid_return [number]
     def index
       @index + 1
     end
 
+    # @liquid_public_docs
+    # @liquid_summary
+    #   The 0-based index of the current iteration.
+    # @liquid_return [number]
     def index0
       @index
     end
 
+    # @liquid_public_docs
+    # @liquid_summary
+    #   The 1-based index of the current iteration, in reverse order.
+    # @liquid_return [number]
     def rindex
       @length - @index
     end
 
+    # @liquid_public_docs
+    # @liquid_summary
+    #   The 0-based index of the current iteration, in reverse order.
+    # @liquid_return [number]
     def rindex0
       @length - @index - 1
     end
 
+    # @liquid_public_docs
+    # @liquid_summary
+    #   Returns `true` if the current iteration is the first. Returns `false` if not.
+    # @liquid_return [boolean]
     def first
       @index == 0
     end
 
+    # @liquid_public_docs
+    # @liquid_summary
+    #   Returns `true` if the current iteration is the last. Returns `false` if not.
+    # @liquid_return [boolean]
     def last
       @index == @length - 1
     end