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dart / sdk / 5e8fd90520f5705be4f2d5f0eb686b63afc866f0
commit5e8fd90520f5705be4f2d5f0eb686b63afc866f0[log] [tgz]
authorJohnni Winther <johnniwinther@google.com>Mon Feb 27 09:28:33 2023 +0000
committerCommit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com>Mon Feb 27 09:28:33 2023 +0000
tree68dcafe47058270677ef5e68f0dbd979dcaac807
parent3c7fe84e05d2fc1f786fbe65bc87c2f430e6d562 [diff]
[_fe_analyzer_shared] Support unions in exhaustiveness algorithm

This adds support for union directly in the exhaustiveness algorithm
meaning that we can support deeply nested or-patterns without having
to eagerly expand the patterns.

For instance, without support for unions,

  case (true || false, true || false):

would have to be expanded to

  case (true, true):
  case (true, false):
  case (false, true):
  case (false, false):

before performing exhaustiveness.

Now, we instead perform the expansion in-place and only we need to.
That is, when filtering by subtype `true` of `bool`, we only consider
the row

  (true, true || false)

as remaining, because the row

  (false, true || false)

won't match anyway.

Change-Id: I1a6402bd21b81bf40924ac0048b683936ce9f608
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/285263
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Paul Berry <paulberry@google.com>
9 files changed
tree: 68dcafe47058270677ef5e68f0dbd979dcaac807
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .style.yapf
  21. .vpython
  22. AUTHORS
  23. BUILD.gn
  24. CHANGELOG.md
  25. codereview.settings
  26. CONTRIBUTING.md
  27. DEPS
  28. LICENSE
  29. OWNERS
  30. PATENT_GRANT
  31. PRESUBMIT.py
  32. README.dart-sdk
  33. README.md
  34. sdk_args.gni
  35. SECURITY.md
  36. WATCHLISTS
README.md

Dart

A client-optimized language for fast apps on any platform

Dart is:

  • Optimized for UI: Develop with a programming language specialized around the needs of user interface creation.

  • Productive: Make changes iteratively: use hot reload to see the result instantly in your running app.

  • Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web.

Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:

  • Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.

  • Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).

Dart platforms illustration

License & patents

Dart is free and open source.

See LICENSE and PATENT_GRANT.

Using Dart

Visit dart.dev to learn more about the language, tools, and to find codelabs.

Browse pub.dev for more packages and libraries contributed by the community and the Dart team.

Our API reference documentation is published at api.dart.dev, based on the stable release. (We also publish docs from our beta and dev channels, as well as from the primary development branch).

Building Dart

If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.

There are more documents on our wiki.

Contributing to Dart

The easiest way to contribute to Dart is to file issues.

You can also contribute patches, as described in Contributing.