Python for Swift

Aug 23, 20182 likes1,010 views

The document discusses how a mobile developer at LINE Fukuoka uses Python for code inspection and generation in their iOS app project called LINE Creators Studio. Python scripts are used to detect unused files, generate Swift code for internationalization and analytics event tracking, and more. The developer advocates for using type-safe languages and code generation tools like SwiftGen to get the benefits of dynamic scripting while maintaining type safety.

Python for Swift
/ LINE Fukuoka
2018/8/22, LINE Developer meetup in Kyoto #43

● iOS Developer at LINE Fukuoka
● Project: LINE Creators Studio
Self introduction

● iOS Developer at LINE Fukuoka
● Project: LINE Creators Studio
Self introduction
Today’s topic

● Inspection (find unused file, etc)
● Code generation
We use Python for two purposes

● Inspection (find unused file, etc)
● Code generation
We use Python for two purposes
Today’s topic

There is a common saying
among
Swift developers

Good implementation produces
compilation error
before running with problem

● Any string values 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

● Any string values 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)

● A code generator 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

$"lfk" = "LINE Fukuoka "; "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$

● Dependency Injection / @_ishkawa
iOSDC2017
● Safety + Easiness
Is the best thing to do
for Swift

● Tool for code generation by Apple
● used in apple/swift repository
● uses Python
gyb
https://github.com/apple/swift/blob/2a25a8c14fecaaca68d881fcbcba71a85bcc1e9d/validation-test/stdlib/ArraySlice.swift.gyb

● 100+ Analytics events defined on Wiki
● We have to copy&paste these all?
Motivation

● Parse HTML Table
● Generate Swift code
Specifications
track(AnalyticsEvent.ScreenA.event1)

https://qiita.com/_ha1f/items/f318e1614edb6b08ac3f
Please refer Qiita for detail!

● Types help as 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

LINE Fukuoka
@_ha1f
https://github.com/ha1f

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Python for Swift

1. Python for Swift / LINE Fukuoka 2018/8/22, LINE Developer meetup in Kyoto #43

2. ● iOS Developer at LINE Fukuoka ● Project: LINE Creators Studio Self introduction

3. ● iOS Developer at LINE Fukuoka ● Project: LINE Creators Studio Self introduction Today’s topic

4. ● Inspection (find unused file, etc) ● Code generation We use Python for two purposes

5. ● Inspection (find unused file, etc) ● Code generation We use Python for two purposes Today’s topic

6. There is a common saying among Swift developers

7. Good implementation produces compilation error before running with problem

8. ● Any string values 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 string values 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 string values 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 code generator 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" = "LINE Fukuoka "; "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 for code 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+ Analytics events defined on Wiki ● We have to copy&paste these all? Motivation

16. ● Parse HTML Table ● Generate Swift code Specifications track(AnalyticsEvent.ScreenA.event1)

17. https://qiita.com/_ha1f/items/f318e1614edb6b08ac3f Please refer Qiita for detail!

18. ● Types help as 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

Python for Swift

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