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)1
   ͰΨνͷి୎Λ࡞Δ גࣜձࣾτϥʔφࣾ಺ษڧձ
   
2. Έͳ͞Μ͸
   1)1
   Ͱి୎ 
 ࡞Ζ͏ͱͨ͠ΒͲ͏͠·͔͢ʁ
5. ͜Εʹ͸໰୊͕͋Γ·͢
6. 
   ԋࢉͷ༏ઌ౓ΛܾΊΒΕͳ͍
7. 
   ΦϖϥϯυΛ
   
   ͭҎ্ड͚औΕͳ͍
8. 
   ฏํ͕ࠜܭࢉͰ͖ͳ͍
9. 
   ྦྷ৐͕ܭࢉͰ͖ͳ͍
10. 
    ֊৐͕ܭࢉͰ͖ͳ͍
11. ͳͲͳͲσϝϦοτ͕͋Γ·͢
12. Ψνͷి୎͸͜ΕΒΛܭࢉͰ͖Δ͸ͣͰ͢
13.  ˽       
14. ͜ΕΛϢʔβʔೖྗͰܭࢉ͍ͨ͠
15. Ͱ͸ɼͲ͏͢Δ͔ʁ
16. ܭࢉࣜΛந৅ߏจ໦ʹม׵͠·͢
17. ந৅ߏจ໦͸ɼͲ͏΍Δͷʁ
18. τʔΫϯʹ෼ׂ͢Δ ʢLexerɼࣈ۟ղੳثʣ AST Խ ʢParserɼߏจղੳثʣ ࣮ߦ
19. -FYFS
    Λ࡞Δ
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
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
22. 1BSTFS
    Λ࡞Δ
23. ϊʔυʹʹ෼͚͍ͯ͘
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
25. ઌ΄Ͳͷࣜʹ౰ͯ͸ΊΔͱʜ
26. 4 - * sqrt (√) + + 5 factorial (!) ** 2 8 4 factorial (!) ** 2 8 ※ P_OP, P_CL ͸ϊʔυͷ༏ઌ౓Λܾఆ͚ͮΔͨΊ͚ͩͳͷͰɼAST Խ࣌ʹ͸ফ͑·͢
27. ϥϕϧ໊ʹ௚͢ͱ
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·͢
29. -FYFS
    1BSTFS
    Λ࣮૷͠·͢ɻ
30. IUUQTHJTUHJUIVCDPNNNS BBBGFCEGBFGBFFD
31. ి୎ϥϯλΠϜͷ࣮૷ͷॲཧ PHP ϥϯλΠϜͷ৔߹ͷॲཧ
32. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠