J2Kコンバータをカスタマイズする

2018/7/3 #love_kotlin vol2
paraya3636

Transcript

1. +,ίϯόʔλΛΧελϚΠζ͢Δ
   MPWF@LPUMJOWPM
   QBSBZB
   ͠Ύͬͪΐ͏͹Μ
   

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2. ࣗݾ঺հ
   ɾ ࡾӜՂ༞QBSBZB
   ɾ גࣜձࣾΠάχεॴଐ
   ɾ XJUI"OESPJE୲౰
   ɾ ,PUMJO͸ͷࠒ͔Β ೥ఔ
   
   

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3. ςʔϚ
   ɾ +BWB͔Β,PUMJOʹม׵͢Δͷ͸ͱͯ΋େม
   ɾ ,PUMJOԽ͢Δ্Ͱ௨ৗͷํ๏Ҏ֎ʹ΋΍Γํ
   ͸͋Δ
   

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4. ΋͘͡
   ɾ +BWB͔Β,PUMJOʹม׵͢Δࡍʹۤ࿑͢Δ఺
   ɾ +,ίϯόʔλΛΧελϚΠζ
   

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5. +BWB͔Β,PUMJOʹม׵͢Δ
   ࡍʹۤ࿑͢Δ఺
   

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6. ௨ৗ+BWB͔Β,PUMJOʹม׵͢
   Δࡍ͸ɺ"OESPJE4UVEJP
   *OUFMMJK*%&"͔Βίϯόʔτ͢
   Δͱࢥ͍·͢
   

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7. "OESPJE4UVEJP*OUFMMJK*%&"
   Ͱͷ+,ίϯόʔτ
   ϝχϡʔ ➔ Code
   ➔ Convert Java File to Kotlin File
   

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8. ͨͩ͠ɺ͜ͷ௨ৗͷ+,ίϯ
   όʔλΛ༻͍ͨ,PUMJOԽͷํ
   ๏ʹ͸໰୊͕͋Γ·ͨ͠
   

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9. +,ίϯόʔλ͕ڧ੍తʹ
   /PO/VMMม׵ͯ͠͠·͏
   ໰୊
   

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10. ७ਖ਼+,ίϯόʔλ͕ڧ੍తʹ
    /PO/VMMม׵͢Δ໰୊
    public interface SampleInterface {
    String getText(Context context);
    int getValue(Context context);
    }
    interface SampleInterface {
    fun getText(context: Context): String
    fun getValue(context: Context): Int
    }
    /VMMBCMFͳ
    ίʔυͩͬͨͷ͕
    /PO/VMMίʔυʹ
    ม׵͞Εͯ͠·͏
    ʁ͕ͳ͍ʂ
    +BWB
    ,PUMJO
    

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11. ७ਖ਼+,ίϯόʔλ͕ڧ੍తʹ
    /PO/VMMม׵͢Δ໰୊
    +BWBίʔυଆ͔Β͸/PU/VMMΞϊςʔγϣϯ෇͍ͯ
    ΔͷʹOVMMΛ୅ೖͯ͠ΔΑXBSOJOH͕දࣔ͞Εͯ͠
    ·͏ʂʂ
    +BWB
    

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12. ७ਖ਼+,ίϯόʔλ͕ڧ੍తʹ
    /PO/VMMม׵͢Δ໰୊
    Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method
    kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter context
    at org.paradrops.sample.SampleClass.getText(SampleClass.kt)
    at org.paradrops.sample.Main2Activity.onCreate(Main2Activity.java:14)
    at android.app.Activity.performCreate(Activity.java:6664)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
    IllegalArgumentException: Parameter specified
    as non-null is null
    Ϋϥογϡͯ͠͠·͏ʂʂ
    

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13. ७ਖ਼+,ίϯόʔλ͕ڧ੍తʹ
    /PO/VMMม׵͢Δ
    ɾ ਌$MBTT*OUFSGBDFBCTUSBDUΫϥεͳͲϝιο
    υΛܧঝPS࣮૷ͨ͠৔߹ɺҾ਺ʹ/VMMBCMFΞ
    ϊςʔγϣϯ͕ͳ͍৔߹͸+,͕/PO/VMMม׵
    ͯ͠͠·͏
    ɾ ,PUMJO͸/PO/VMMɺ+BWB͸/VMMBCMF؀ڥʹͳͬ
    ͯ͠·͍ͱͯ΋Ϋϥογϡ͠΍͍͢
    

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14. Ͳ͏ղܾ͢Δ͔ʁ
    ղܾࡦ͸ͲΜͳ΋ͷ͕͋Δ͔ʁ
    

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15. ղܾҊ
    ɾ ख௚͠Ҋɿ֤Ҿ਺໭Γ஋ͷܕͷ/VMMBCMF
    /PO/VMM͕ਖ਼͍͔͠ɺ໨ࢹͰνΣοΫͯ͠ख
    ௚͢͠Δ
    ɾ શಈ࡞νΣοΫҊɿͱΓ͋͑ͣ,PUMJOԽͯ͠
    ΞϓϦͷશಈ࡞νΣοΫͯ͠मਖ਼͢Δ
    

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16. ͲͪΒ΋͵͘΋ΓҲΕ͍ͯΔର
    ԠͰͱͯ΋΍Γͨ͘ͳ͍
    ,PUMJOԽ͢Δͱߦͷίʔυ
    ม׵ͱ͔ී௨ʹ͋Δɻ
    ͦΕΛख࡞ۀͰमਖ਼ͨ͠ίʔυ
    ͷϨϏϡʔ͢Δͷ͸ਏ͗͢Δ
    

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17. ͜͜·Ͱߟ͑ͯҰͭ
    ࢥ͍͖ͭ·ͨ͠
    

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18. ,PUMJOͬͯ044ͩ͠
    ίϯόʔλΛվ଄͢Ε͹Α͍
    ͷͰ͸ʜʁ
    

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19. +BWB͸/VMMBCMF͕ඪ४ͩ͠ɺ
    ,PUJOଆ΋Ҿ਺ͱ໭Γ஋Λ
    /VMMBCMFʹ͢Ε͹͍͚ͦ͏
    

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20. ΍ΔՁ஋͸͋Δ
    

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21. +,ίϯόʔλΛ
    ΧελϚΠζ͢Δ
    

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22. +,ίϯόʔλΧελϚΠζ·
    Ͱͷεςοϓ
    ɾ ,PUMJOͷ։ൃ؀ڥΛ༻ҙ͢Δ
    ɾ ,PUMJOͷ5ZQF$POWFSUFSLUΛฤू͢Δ
    ɾ ,PUMJOΛνϟΠϧυ*%&"࣮ߦ͢Δ
    ɾ ίʔυΛίϯόʔτͯ͠ΈΔ
    

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23. ,PUMJOͷ։ൃ؀ڥΛ༻ҙ
    ɾ *OUFMMJ+*%&"
    ɾ +%,
    ɾ CSFXJOTUBMMBOU
    ɾ IUUQTHJUIVCDPN+FU#SBJOTLPUMJO
    ɾ ৄࡉ͸!TIJSBKJ͞ΜͷϒϩάهࣄͳͲͰIUUQT
    TIJSBKJHJUIVCJPCMPHIPXUPLPOUSJCVUF
    WTFUVQ
    

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24. ,PUMJOͷ5ZQF$POWFSUFSLUΛฤ
    ू͢Δ
    IUUQTHJUIVCDPN+FU#SBJOTLPUMJOCMPCNBTUFS
    KLTSDPSHKFUCSBJOTLPUMJOKL5ZQF$POWFSUFSLU
    fun variableNullability(variable: PsiVariable):
    Nullability = Nullability.Nullable
    fun methodNullability(method: PsiMethod):
    Nullability = Nullability.Nullable
    

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25. ,PUMJOΛνϟΠϧυ*%&"࣮ߦ͢
    Δ
    

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26. ࣮ࡍʹ,PUMJOίʔυίϯόʔτ
    ͯ͠ΈΔ
    public interface SampleInterface {
    String getText(Context context);
    int getValue(Context context);
    }
    interface SampleInterface {
    fun getText(context: Context?): String?
    fun getValue(context: Context?): Int
    }
    /VMMBCMFͳ
    +BWBίʔυ
    ͩͬͨͷ͕
    ͔ͬ͠Γͱ
    /VMMBCMFΛ
    อ࣋ͨ͠··
    ม׵͞Ε͍ͯΔ
    +BWB
    ,PUMJO
    

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27. ࣮ࡍʹΧελϜ+,Ͱίϯόʔ
    τͨ͠ίʔυΛ࢖ͬͯΈΔ
    /VMMBCMFʹOVMMΛ୅ೖ͢Δͷ͸ී௨ͷ͜ͱͳͷͰ
    XBSOJOH͸ग़ͣɺΫϥογϡ΋͠ͳ͍
    ར༻͢Δ+BWBίʔυଆʹมߋΛՃ͑Δඞཁͳ͠
    

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28. ͿͬͪΌ͚ΧελϜίϯόʔλ
    ͷ࢖༻ײͲ͏ʁ
    ɾ ࢖͍࢝Ίͨͷ͸ࠓ೥ͷࠒ
    ɾ ϦϦʔε➔Ϋϥογϡ➔IPUGJYͷܹݮ
    ɾ ίϯόʔλ͕ੜ੒͢Δίʔυʹ৴པײˠίʔ
    υϨϏϡʔͷ؆ૉԽ
    ɾ ,PUMJOԽ͕ؾܰʹͰ͖ΔΑ͏ʹ➔͜Εେࣄ
    

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29. ͓·͚
    

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30. ΧελϜ+,ίϯόʔλ΋ͬͯ
    ͖ͨΑ
    

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31. ͓·͚ͷXJUI·Μ͕
    IUUQIFMQXJUIJT Q
    Α͔ͬͨΒಡΜͰΈͯͶ
    ແྉͩΑʂ
    ͠Ύͬͪΐ͏͹Μ
    

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32. ͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ
    ͠Ύͬͪΐ͏͹Μ
    

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33. XJUI͸"OESPJEΤϯδχΞΛେઈࢍืूதʂ
    ϕςϥϯ,PUMJOΤϯδχΞ͕αϙʔτ͢ΔͷͰ
    ॳ৺ऀͰ΋,PUMJOʹڵຯ͕͋ΔͳΒ
    ؾܰʹԠืͯ͠ΈͯͶʂ
    IUUQTXXXXBOUFEMZDPNQSPKFDUT
    ͠Ύͬͪΐ͏͹Μ
    

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