PHP でガチの電卓を作る

- Title: How to make a serious calculator with PHP
- Lightning talk in our company

Transcript

1. Ί΋Γʙ
   1)1ͰΨνͷి୎Λ࡞Δ
   גࣜձࣾτϥʔφࣾ಺ษڧձ
   

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2. Έͳ͞Μ͸1)1Ͱి୎
   

   ࡞Ζ͏ͱͨ͠ΒͲ͏͠·͔͢ʁ
   

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5. ͜Εʹ͸໰୊͕͋Γ·͢
   

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6. 
   ԋࢉͷ༏ઌ౓ΛܾΊΒΕͳ͍
   

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7. 
   ΦϖϥϯυΛͭҎ্ड͚औΕͳ͍
   

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8. 
   ฏํ͕ࠜܭࢉͰ͖ͳ͍
   

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9. 
   ྦྷ৐͕ܭࢉͰ͖ͳ͍
   

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10. 
    ֊৐͕ܭࢉͰ͖ͳ͍
    

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11. ͳͲͳͲσϝϦοτ͕͋Γ·͢
    

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12. Ψνͷి୎͸͜ΕΒΛܭࢉͰ͖Δ͸ͣͰ͢
    

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13. ˽
    
    
    
    

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14. ͜ΕΛϢʔβʔೖྗͰܭࢉ͍ͨ͠
    

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15. Ͱ͸ɼͲ͏͢Δ͔ʁ
    

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16. ܭࢉࣜΛந৅ߏจ໦ʹม׵͠·͢
    

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17. ந৅ߏจ໦͸ɼͲ͏΍Δͷʁ
    

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18. τʔΫϯʹ෼ׂ͢Δ
    
    
    ʢLexerɼࣈ۟ղੳثʣ
    AST Խ
    
    
    ʢParserɼߏจղੳثʣ
    ࣮ߦ
    

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19. -FYFSΛ࡞Δ
    

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20. ˽
    
    
    
    NUM
    OP
    FN_R
    P_OP
    P_OP
    NUM
    FN_L
    OP
    NUM
    OP
    NUM
    P_CL
    OP
    OP
    NUM
    FN_L
    OP
    NUM
    OP
    NUM
    P_CL
    P_CL
    ͜ͷΑ͏ʹҙຯΛ΋ͬͨ࠷খ୯ҐʢτʔΫϯʣʹϥϕϧ(NUM, OP, FN_R ͳͲ)Λ෇͚ͨΓ͢Δͷ͕
    Lexer ͷ໾ׂͰ͢ʢ౰ࣾͷݕࡧػೳͰ΋࣮૷͞Ε͍ͯ·͢ʣ
    ࠓճͷి୎࣮૷Ͱग़ͯ͘Δͷ͸ NUM, OP, FN_L, FN_R, P_OP, P_CL ͷ 6 छྨ͚ͩʂ
    ͪͳΈʹ PHP ͸ϚχϡΞϧ্ 147 छྨ͋Γ·͢ɻ
    

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21. τʔΫϯ ໾ׂ
    NUM ਺ࣈ
    OP Operatorɻ+, -, *, /, ** ͳͲΛࢦ͢
    FN_R
    Function Right. ӈଆͷ਺ࣈʹԿ͔͠Βؔ਺Λద༻͢Δ

    ʢฏํࠜɼࡾ֯ؔ਺ͳͲʣ
    FN_L
    Function Left. ࠨଆͷ਺ࣈʹԿ͔͠Βؔ਺Λద༻͢Δ
    
    ʢ֊৐ه߸ʣ
    P_OP
    Parentheses open. Χοί࢝·ΓΛࢦ͢ɻ
    
    P_CL ͱಉ͡ݸ਺ͳ͚Ε͹͍͚ͳ͍ɻ
    P_CL
    Parentheses close. Χοίด͡Λࢦ͢

    P_OP ͱಉ͡ݸ਺ͳ͚Ε͹͍͚ͳ͍ɻ
    

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22. 1BSTFSΛ࡞Δ
    

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23. ϊʔυʹʹ෼͚͍ͯ͘
    

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24. OP
    NUM NUM
    OP
    NUM NUM
    OP
    FN_L or FN_R
    FN_L or FN_R
    ඞͣϊʔυͷ࢝·Γ͕ OP τʔΫϯʹͳΔ
    Φϖϥϯυ͸ඞͣରʹͳΔΑ͏ʹ͢Δ
    ʢ࣮ߦॱং͕ෆ໌ʹͳΔͨΊʣ
    ӈΦϖϥϯυ
    ࠨΦϖϥϯυ
    ӈΦϖϥϯυ
    ࠨΦϖϥϯυ
    ࠨΦϖϥϯυ ӈΦϖϥϯυ
    

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25. ઌ΄Ͳͷࣜʹ౰ͯ͸ΊΔͱʜ
    

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26. 4 -
    *
    sqrt (√)
    + +
    5
    factorial (!)
    **
    2 8
    4
    factorial (!)
    **
    2 8
    ※ P_OP, P_CL ͸ϊʔυͷ༏ઌ౓Λܾఆ͚ͮΔͨΊ͚ͩͳͷͰɼAST Խ࣌ʹ͸ফ͑·͢
    

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27. ϥϕϧ໊ʹ௚͢ͱ
    

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28. NUM OP
    OP
    FN_R
    OP OP
    NUM
    FN_L
    OP
    NUM NUM
    NUM
    FN_L
    OP
    NUM NUM
    ※ P_OP, P_CL ͸ϊʔυͷ༏ઌ౓Λܾఆ͚ͮΔͨΊ͚ͩͳͷͰɼAST Խ࣌ʹ͸ফ͑·͢
    

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29. -FYFS 1BSTFSΛ࣮૷͠·͢ɻ
    

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30. IUUQTHJTUHJUIVCDPNNNS
    BBBGFCEGBFGBFFD
    

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31. ి୎ϥϯλΠϜͷ࣮૷ͷॲཧ
    PHP ϥϯλΠϜͷ৔߹ͷॲཧ
    

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32. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
    

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