Static Swift Code Analysis - The Background Story
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Presentation at Helsinki iOS meetup, talking about how a static swift code analyser works at background to create a dependency graph of frameworks, type inheritance and usage dependency inside given source code files.
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Static Swift Code Analysis - The Background Story
- 1. Static Swift Code Analysis The Background Story HelsinkiOS March 2017 Jouni Miettunen @jomtwi Zalando Helsinki Jouni Miettunen at HelsinkiOS March, 2017 1
- 2. What ? Oriented graph of dependencies between classes ? Objective-C has objc_dep "Class A depends on B if class A imports class B header" Jouni Miettunen at HelsinkiOS March, 2017 2
- 3. Why Discover real (sub) architecture ? New features with existing APIs ? Maintenance & bug fixes ? Refactor technical dept ? Curious or new people Jouni Miettunen at HelsinkiOS March, 2017 3
- 4. What about swift? Jouni Miettunen at HelsinkiOS March, 2017 4
- 5. Compiled object files ? App / framework sources ? Fix project settings ? Update to latest swift ? Build project ? Parse compiled object files ? Open the graph ? Profit !!! Jouni Miettunen at HelsinkiOS March, 2017 5
- 6. Want ? Fast ? Easy ? Configure ? Parse whatever ? Profit !!! Jouni Miettunen at HelsinkiOS March, 2017 6
- 7. Work in progress ... Hackweek #5 Zalando Open Source How to Open Source at Zalando Jouni Miettunen at HelsinkiOS March, 2017 7
- 8. Phase 0: basics ? python ? One file or folder tree ? One line, regex ? Ignore ? swift keywords ? swift vs. Objective-C frameworks (71) Jouni Miettunen at HelsinkiOS March, 2017 8
- 9. Phase 1: import framework import-kind ★ typealias struct class enum protocol var func The Swift Programming Language (Swift 3.0.1) // Easy import Foundation @testable import MyFramework // What to do import func MyFramework.debugLog import class MyFramework.DebugLogger import enum MyFramework.DebugLevel import class MyFramework.UIButton Jouni Miettunen at HelsinkiOS March, 2017 9
- 10. Phase 2: class inheritance ? class, protocol, struct, enum ? generics, extensions, typealias internal final class MyClass {} class SomeClass: Superclass, FirstProtocol {} open class Event <ElementA, ElementB>: EventType {} @objc protocol MyDelegate: OtherDelegate {} public protocol OwnProtocol: class {} "Extensions can add new nested types to existing classes, structures, and enumerations" Jouni Miettunen at HelsinkiOS March, 2017 10
- 11. Phase 3: class usage 1.Definitions 2.Namespace {} and strings 3.Ignore and match Jouni Miettunen at HelsinkiOS March, 2017 11
- 12. Phase 4: decoration ? UI via Graphviz ? Type shapes and colors ? Point of view ? Lonely ? Circular dependencies ? Risk(ish) analysis Jouni Miettunen at HelsinkiOS March, 2017 12
- 13. Phase 5: future ? Continuous integration ? More circular dependencies ? Unused code ? Internal modules ? Any language ? Profit !!! Jouni Miettunen at HelsinkiOS March, 2017 13
- 14. Thank You!! We're hiring, too backend web mobile Profit !!! Jouni Miettunen at HelsinkiOS March, 2017 14
- 15. The Others ? objc_dep ? Refactorator II, The App ? Objective-C Class Dependencies Visualizer ? Swift relationship graph Jouni Miettunen at HelsinkiOS March, 2017 15