Add japanese address (#314)

* Add address_ja.rb and its test

* add AddressJA to reference

* fix code style as suggested

* fix code style as suggested

* remove private from addressja test helper

* fix test_prefecture regexp

REFERENCE.md

@@ -14,6 +14,7 @@
  * [FFaker::AddressFR](#ffakeraddressfr)
  * [FFaker::AddressGR](#ffakeraddressgr)
  * [FFaker::AddressIN](#ffakeraddressin)
+ * [FFaker::AddressJA](#ffakeraddressja)
  * [FFaker::AddressKR](#ffakeraddresskr)
  * [FFaker::AddressMX](#ffakeraddressmx)
  * [FFaker::AddressNL](#ffakeraddressnl)

lib/ffaker/address_ja.rb

@@ -0,0 +1,86 @@
+# encoding: utf-8
+# frozen_string_literal: true
+
+require 'ffaker/address'
+
+module FFaker
+  module AddressJA
+    include FFaker::Address
+
+    extend ModuleUtils
+    extend self
+
+    ZIP_FORMATS = ['###-####'].freeze
+    LAND_NUMBER_FORMATS = ['#丁目#番#号', '###'].freeze
+
+    def address
+      fetch_sample([
+        "#{postal_code} #{prefecture}#{city}#{street}#{land_number}",
+        "#{postal_code} #{prefecture}#{county}#{street}#{land_number}",
+        "#{postal_code} #{prefecture}#{designated_city}#{ward}#{street}#{land_number}",
+        "#{postal_code} 東京都#{tokyo_ward}#{street}#{land_number}"
+      ])
+    end
+
+    def other_address
+      fetch_sample([
+        "#{postal_code} #{prefecture}#{city}#{street}#{land_number}",
+        "#{postal_code} #{prefecture}#{county}#{street}#{land_number}"
+      ])
+    end
+
+    def designated_city_address
+      fetch_sample([
+                      # 愛知県名古屋市中区錦3丁目24番4号
+                      "#{postal_code} #{prefecture}#{designated_city}#{ward}#{street}#{land_number}"
+                   ])
+    end
+
+    def tokyo_ward_address
+      fetch_sample([
+                      # 東京都千代田区永田町2丁目2番1号
+                      "#{postal_code} 東京都#{tokyo_ward}#{street}#{land_number}"
+                   ])
+    end
+
+    def postal_code
+      FFaker.numerify(fetch_sample(ZIP_FORMATS))
+    end
+
+    def land_number
+      FFaker.numerify(fetch_sample(LAND_NUMBER_FORMATS))
+    end
+
+    def street
+      FFaker.numerify(fetch_sample(CITY))
+    end
+
+    def tokyo_ward
+      fetch_sample(TOKYO_WARD)
+    end
+
+    def ward
+      fetch_sample(WARD)
+    end
+
+    def village
+      fetch_sample(VILLAGE)
+    end
+
+    def designated_city
+      fetch_sample(CITY)
+    end
+
+    def city
+      fetch_sample(CITY)
+    end
+
+    def county
+      fetch_sample(COUNTY)
+    end
+
+    def prefecture
+      fetch_sample(PREFECTURE)
+    end
+  end
+end