Python for Swift

Python for Swift

• 1.
  Python for Swift /LINE Fukuoka 2018/8/22, LINE Developer meetup in Kyoto #43
• 2.
  ● iOS Developerat LINE Fukuoka ● Project: LINE Creators Studio Self introduction
• 3.
  ● iOS Developerat LINE Fukuoka ● Project: LINE Creators Studio Self introduction Today’s topic
• 4.
  ● Inspection (findunused file, etc) ● Code generation We use Python for two purposes
• 5.
  ● Inspection (findunused file, etc) ● Code generation We use Python for two purposes Today’s topic
• 6.
  There is acommon saying among Swift developers
• 7.
  Good implementation produces compilationerror before running with problem
• 8.
  ● Any stringvalues are acceptable as filename Cause of runtime error For example… read(“path/to/file”) send(“v2”) ● When you want to send version ● “2”, ”ver2” are acceptable, and caller must assure the input
• 9.
  ● Any stringvalues are acceptable as filename Cause of runtime error For example… read(“path/to/file”) send(“v2”) ● When you want to send version ● “2”, ”ver2” are acceptable, and caller must assure the input Runtime Error
• 10.
  ● Any stringvalues are acceptable as filename Cause of runtime error Solutions read(“path/to/file”) send(“v2”) ● When you want to send version ● “2”, ”ver2” are acceptable, and caller must assure the input Android generates R, and we can write like `R.id.filename` Define original types like enum (※constant string is not enough)
• 11.
  ● A codegenerator like R of Android ● Variable asset is Asset type, and we cannot use String, etc… ● Also we can use for Font, Color, Localizing, … https://github.com/SwiftGen/SwiftGen SwiftGen
• 12.
  "lfk" = "LINEFukuoka "; "meetup.name" = “Developer Meetup #%d"; "meetup.themeis" = " %@"; enum L10n { /// LINE Fukuoka static let lfk = L10n.tr("localizable", "lfk") enum Meetup { /// LINE Developer Meetup #%d static func name(_ p1: Int) -> String { return L10n.tr("localizable", "meetup.name", p1) } /// %@ static func themeis(_ p1: String) -> String { return L10n.tr("localizable", "meetup.themeis", p1) } } } $ swiftgen strings -t dot-syntax-swift3 path/to/file SwiftGen output example
• 13.
  ● Dependency Injection/ @_ishkawa iOSDC2017 ● Safety + Easiness Is the best thing to do for Swift
• 14.
  ● Tool forcode generation by Apple ● used in apple/swift repository ● uses Python gyb https://github.com/apple/swift/blob/2a25a8c14fecaaca68d881fcbcba71a85bcc1e9d/validation-test/stdlib/ArraySlice.swift.gyb
• 15.
  ● 100+ Analyticsevents defined on Wiki ● We have to copy&paste these all? Motivation
• 16.
  ● Parse HTMLTable ● Generate Swift code Specifications track(AnalyticsEvent.ScreenA.event1)
• 17.
  https://qiita.com/_ha1f/items/f318e1614edb6b08ac3f Please refer Qiitafor detail!
• 18.
  ● Types helpas to be safe! ● Writing small scripts with shell, Python is good… ● We have to write without types to be typed? No! You can use Swift + Sourcery if you have enough time! Conclusion
• 19.
  LINE Fukuoka @_ha1f https://github.com/ha1f
• 20.
  THANK YOU