From 863bf369b8a8b1eeb58c6fb8fc81e093b08bbda7 Mon Sep 17 00:00:00 2001
From: Luka Vandervelden <lukc@upyum.com>
Date: Fri, 10 Jan 2020 17:20:10 +0100
Subject: [PATCH]  #reverse_each, #reverse_each_with_index added.

---
 spec/test.cr | 23 ++++++++++++++++++++---
 src/dodb.cr  | 22 ++++++++++++++++++++++
 2 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/spec/test.cr b/spec/test.cr
index 3ddc086..d50f240 100644
--- a/spec/test.cr
+++ b/spec/test.cr
@@ -30,11 +30,12 @@ class Ship
 	# and can easily be extended.
 
 	class_getter kisaragi = Ship.new("Kisaragi", "Mutsuki")
-	class_getter mutsuki = Ship.new("Mutsuki",  "Mutsuki", tags: ["name ship"])
+	class_getter mutsuki  = Ship.new("Mutsuki",  "Mutsuki", tags: ["name ship"])
+	class_getter yayoi    = Ship.new("Yayoi",    "Mutsuki")
 	class_getter destroyers = [
-		@@kisaragi,
 		@@mutsuki,
-		Ship.new("Yayoi",    "Mutsuki"),
+		@@kisaragi,
+		@@yayoi,
 		Ship.new("Uzuki",    "Mutsuki"),
 		Ship.new("Satsuki",  "Mutsuki"),
 
@@ -157,6 +158,22 @@ describe "DODB::DataBase" do
 
 			db1.to_a.size.should eq(2)
 		end
+
+		it "iterates in normal and reversed order" do
+			db = DODB::SpecDataBase.new
+
+			Ship.all_ships.each do |ship|
+				db << ship
+			end
+
+			db.each_with_index do |item, index|
+				item.should eq Ship.all_ships[index]
+			end
+
+			db.reverse_each_with_index do |item, index|
+				item.should eq Ship.all_ships.reverse[index]
+			end
+		end
 	end
 
 	describe "indices" do
diff --git a/src/dodb.cr b/src/dodb.cr
index 0004e91..33a73c0 100644
--- a/src/dodb.cr
+++ b/src/dodb.cr
@@ -206,6 +206,28 @@ class DODB::DataBase(V)
 		end
 	end
 
+	def reverse_each_with_index
+		(last_index..0).each do |key|
+			full_path = file_path key
+
+			next unless File.exists? full_path
+
+			begin
+				# FIXME: Only intercept JSON parsing errors.
+				item = read full_path
+			rescue
+				next
+			end
+
+			yield item, key
+		end
+	end
+	def reverse_each
+		reverse_each_with_index do |item, index|
+			yield item
+		end
+	end
+
 	##
 	# CAUTION: Very slow. Try not to use.
 	def to_a