From 400aa4a9e090b1c4c62a0c0b23a4cd45555f8b3e Mon Sep 17 00:00:00 2001
From: Truls Tangstad <tangstad@pvv>
Date: Sun, 21 Oct 2012 16:55:55 +0900
Subject: [PATCH 1/2] =?UTF-8?q?Parse=20=E5=B9=B3=E6=88=90,=20=E6=98=AD?=
 =?UTF-8?q?=E5=92=8C,=20=E5=A4=A7=E6=AD=A3,=20=E6=98=8E=E6=B2=BB?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 kim_truls/japanese_era.rb | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 kim_truls/japanese_era.rb

diff --git a/kim_truls/japanese_era.rb b/kim_truls/japanese_era.rb
new file mode 100644
index 0000000..53be466
--- /dev/null
+++ b/kim_truls/japanese_era.rb
@@ -0,0 +1,39 @@
+# encoding: utf-8
+require 'rspec'
+require 'date'
+
+module JapaneseEra
+    def self.convert date_str
+        date = Date.parse(date_str)
+        date_str_jp = ""
+        if date >= Date.new(1989,1,8)
+            date_str_jp = "平成#{date.year - 1988}年#{date.month}月#{date.day}日"
+        elsif date >= Date.new(1926, 12, 25)
+            date_str_jp = "昭和#{date.year - 1925}年#{date.month}月#{date.day}日"
+        elsif date >= Date.new(1912, 07, 30)
+            date_str_jp = "大正#{date.year - 1911}年#{date.month}月#{date.day}日"
+        else 
+            date_str_jp = "明治#{date.year - 1867}年#{date.month}月#{date.day}日"
+        end
+         return date_str_jp
+    end
+end
+
+describe JapaneseEra do
+    describe "#convert" do
+        it "can convert year to 平成" do
+            JapaneseEra.convert("1989-01-08").should eq "平成1年1月8日"
+        end
+        it "can convert year to 昭和" do
+            JapaneseEra.convert("1989-01-07").should eq "昭和64年1月7日"
+            JapaneseEra.convert("1926-12-25").should eq "昭和1年12月25日"
+        end
+        it "can convert year to 大正" do
+            JapaneseEra.convert("1912-07-30").should eq "大正1年7月30日"
+            JapaneseEra.convert("1926-12-24").should eq "大正15年12月24日"
+        end
+        it "can convert year to 明治" do
+            JapaneseEra.convert("1912-07-29").should eq "明治45年7月29日"
+        end
+    end
+end

From 4f500d40d3c9bdec0c9b521335bebc317b31ccb7 Mon Sep 17 00:00:00 2001
From: Truls Tangstad <tangstad@pvv>
Date: Sun, 21 Oct 2012 17:23:13 +0900
Subject: [PATCH 2/2] Cleanup using lookup table

---
 kim_truls/japanese_era.rb | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/kim_truls/japanese_era.rb b/kim_truls/japanese_era.rb
index 53be466..c92be59 100644
--- a/kim_truls/japanese_era.rb
+++ b/kim_truls/japanese_era.rb
@@ -3,19 +3,18 @@
 require 'date'
 
 module JapaneseEra
+    Eras = {"平成" => Date.new(1989, 1, 8),
+        "昭和" => Date.new(1926, 12, 25),
+        "大正" => Date.new(1912, 07, 30),
+        "明治" => Date.new(1868, 9, 8),
+    }
+
     def self.convert date_str
         date = Date.parse(date_str)
         date_str_jp = ""
-        if date >= Date.new(1989,1,8)
-            date_str_jp = "平成#{date.year - 1988}年#{date.month}月#{date.day}日"
-        elsif date >= Date.new(1926, 12, 25)
-            date_str_jp = "昭和#{date.year - 1925}年#{date.month}月#{date.day}日"
-        elsif date >= Date.new(1912, 07, 30)
-            date_str_jp = "大正#{date.year - 1911}年#{date.month}月#{date.day}日"
-        else 
-            date_str_jp = "明治#{date.year - 1867}年#{date.month}月#{date.day}日"
+        Eras.each do |era, start|
+            return "#{era}#{date.year - start.year + 1}年#{date.month}月#{date.day}日" if date >= start
         end
-         return date_str_jp
     end
 end