Passive form

lib/ika_conjugations/verb.rb

@@ -73,6 +73,10 @@ module IkaConjugations
       negative_stem + "よう"
     end
 
+    def passive
+      Ichidan.new(passive_starter.kanji, passive_starter.kana, "#{definition} (dissatisfied)")
+    end
+
     class Ichidan < Verb
       def stem
         all_but_last_character
@@ -93,6 +97,10 @@ module IkaConjugations
       def ba
         stem + "れば"
       end
+
+      def passive_starter
+        stem + "られる"
+      end
     end
 
     class Godan < Verb
@@ -152,6 +160,10 @@ module IkaConjugations
       def ba
         all_but_last_character + last_character("e") + "ば"
       end
+
+      def passive_starter
+        all_but_last_character + last_character("a") + "れる"
+      end
     end
 
     class Suru < Verb
@@ -178,6 +190,10 @@ module IkaConjugations
       def ba
         prefix + "すれば"
       end
+
+      def passive_starter
+        prefix + "される"
+      end
     end
 
     class Kuru < Verb
@@ -204,6 +220,10 @@ module IkaConjugations
       def ba
         prefix + KanaKanji.new("く", "来") + "れば"
       end
+
+      def passive_starter
+        prefix + KanaKanji.new("こ", "来") + "られる"
+      end
     end
   end
 end

test/ika_conjugations/test_verb.rb

@@ -249,5 +249,18 @@ module IkaConjugations
       assert_equal "あれば", @aru.ba.kanji
       assert_equal "会えば", @au.ba.kanji
     end
+
+    def test_passive
+      assert_equal "見られる", @miru.passive.dictionary.kanji
+      assert_equal "飲まれる", @nomu.passive.dictionary.kanji
+      assert_equal "される", @suru.passive.dictionary.kanji
+      assert_equal "勉強される", @benkyousuru.passive.dictionary.kanji
+      assert_equal "来られる", @kuru.passive.dictionary.kanji
+      assert_equal "こられる", @kuru.passive.dictionary.kana
+      assert_equal "連れて来られる", @tsuretekuru.passive.dictionary.kanji
+      assert_equal "つれてこられる", @tsuretekuru.passive.dictionary.kana
+      assert_equal "あられる", @aru.passive.dictionary.kanji
+      assert_equal "会われる", @au.passive.dictionary.kanji
+    end
   end
 end