From ㍻ to U+32FF

@RubyKaigi 2019

Transcript

1. From ㍻ to U+32FF
   From ㍻ to U+32FF
   From ㍻ to U+32FF
   From ㍻ to U+32FF
   MITSUBOSHI Yuya
   

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2. From ㍻ to U+32FF
   From ㍻ to U+32FF
   From ㍻ to U+32FF
   From ㍻ to
   MITSUBOSHI Yuya
   

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3. Self-Introduction
   MITSUBOSHI Yuya (三星祐也)
   - GitHub: @MITSUBOSHI
   - Twitter: @Y_MITSUBOSHI
   - Working for Money Forward, inc.
   - Born in Heisei (平成) 5
   

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4. 2019 is a Big Year for Accounting Software in Japan
   - Change of Gengo (Japanese Era Name)
   - 平成(Heisei) -> 令和(Reiwa)
   - From 2019/05: less than half a month left
   - Change of Consumption Tax Rate
   - 8% -> 10% and multiple tax rates (+ reduced tax rate) will be introduced
   - From 2019/10: still more than 5 months left
   

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5. What gengo is
   *quoted from wikipedia
   

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6. What gengo is: briefly
   - Gengo is one of the year numbering system
   used in Japan
   - It is convertible to Christian Era (Heisei 31 -> 2019)
   - Gengo changes when the Emperor changes
   

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7. Schedule
   New Japanese era name Announced
   April May
   Golden Week
   1st 27 6
   18 20
   RubyKaigi 2019
   Reiwa (令和)
   Heisei (平成)
   

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8. How our system use Japanese era
   2019
   

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9. How our system use Japanese era
   2019
   Tax
   Office
   

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10. How our system use Japanese era
    2019
    Tax
    Office
    平成31
    

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11. How our system use Japanese era
    Bank
    Other
    Company
    2019
    Tax
    Office
    平成31
    

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12. How our system use Japanese era
    Bank
    Other
    Company
    2019
    Tax
    Office
    平成31
    平成31
    

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13. How our system use Japanese era
    Bank
    Other
    Company
    2019
    Tax
    Office
    平成31
    H.31
    平成31
    

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14. How our system use Japanese era
    Bank
    Other
    Company
    2019
    Tax
    Office
    平成31
    h31
    平成31
    H.31
    

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15. Patterns of usage of Japanese era
    - Pattern 1. Christian era (Our System) -> Japanese era (Other System)
    - Pattern 2. Japanese era (Other System) -> Christian era (Our System)
    

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16. Pattern 1. Christian era -> Japanese era
    - Examples:
    - 2019/04/30 -> 平成31年04月30日
    - 2019/05/01 -> 令和01年05月01日
    - We have only to care about the format of converted result (right-hand side)
    - That is because the original format (left-hand side) is stored in our DB as date
    type
    

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17. Pattern 2. Japanese era -> Christian era
    - Examples:
    - 平成31年04月30日 -> 2019/04/30
    - 令和01年05月01日 -> 2019/05/01
    

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18. Pattern 2. Japanese era -> Christian era
    - Examples:
    - 平成31年04月30日 -> 2019/04/30
    - 令和01年05月01日 -> 2019/05/01
    - 平成31年05月01日 -> ???
    

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19. Pattern 2. Japanese era -> Christian era
    - Examples:
    - 平成31年04月30日 -> 2019/04/30
    - 令和01年05月01日 -> 2019/05/01
    - 平成31年05月01日 -> 2019/05/01 #<- should be convertible
    

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20. Pattern 2. Japanese era -> Christian era
    - Examples:
    - 平成31年04月30日 -> 2019/04/30
    - 令和01年05月01日 -> 2019/05/01
    - 平成31年05月01日 -> 2019/05/01 #<- should be convertible
    - 令和01年04月30日 -> 2019/04/30 #<- should be convertible
    

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21. Pattern 2. Japanese era -> Christian era
    - Examples:
    - 平成31年04月30日 -> 2019/04/30
    - 令和01年05月01日 -> 2019/05/01
    - 平成31年05月01日 -> 2019/05/01 #<- should be convertible
    - 令和01年04月30日 -> 2019/04/30 #<- should be convertible
    - 令和元年05月01日 -> 2019/05/01 #<- should be convertible
    * “元年” means origin year. it’s used for year 1 of an era.
    

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22. Pattern 2. Requirements
    - 1. 令和{0,}1 #Kanji + half-width number
    - 2. 令和{０,}１ #Kanji + full-width number
    - 3. 令和元 #Kanji + 元年(origin year)
    - 4. R{0,}1 #Capital R without dot
    - 5. R.{0, 1} #Captial R with dot
    - 6. r.{0, 1} #samll r with dot
    - 7. 2019 #half-width number
    - 8. ２０１９ #full-width number
    - 9. Others (1~8 + some unnecessary characters or spaces may be included)
    *Needless to say, “平成”(the current Gengo) must be covered
    

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23. Ecosystem around Japanese era
    - Date#jisx0301
    - Ruby 2.6.3 was released yesterday
    - gem “wareki”
    - gem “era_ja”
    - They are nice! But none of them satisfy all our system’s unique requirements
    (before I mentioned).
    

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24. All of our steps
    1. Investigate the code which must be modified.
    2. Add test codes
    3. Refactor the code
    4. Make the code compatible with “Reiwa (令和)”
    

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25. 3. Refactor the code: the original code
    

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26. 3. Refactor the code: if statement part
    

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27. 3. Refactor the code: add Reiwa to RE?
    

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28. 3. Refactor the code: add Reiwa to RE?
    Only for Heisei (平成)
    

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29. 3. Refactor the code: add elsif statement for Reiwa?
    

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30. 3. Refactor the code: After 1
    

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31. 3. Refactor the code: After 2
    

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32. 3. Refactor the code: After final
    

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33. 4. Make the code compatible with “Reiwa(令和)”
    

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34. Conclusion
    - This talk was about the change of gengo and how our team dealt with it
    - The current Japanese era “Heisei (平成)” will end soon
    - Look forward to the new Japanese era “Reiwa (令和)”
    - We’re hiring!!
    

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