commit | ce91bcb442ced2ff8c1289f58e9d6898e09c0335 | [log] [tgz] |
---|---|---|
author | Paul Berry <paulberry@google.com> | Tue Feb 12 14:49:14 2019 +0000 |
committer | commit-bot@chromium.org <commit-bot@chromium.org> | Tue Feb 12 14:49:14 2019 +0000 |
tree | b0dede16ea2f82e78be027c8268cfcfe11fda846 | |
parent | 69589be237a288a8b02cb3b9642e1e204537e63c [diff] |
Add migration support for named parameters. Currently assuming that the language team chooses option 2 for https://github.com/dart-lang/language/issues/156#issuecomment-460525075. To handle the case where the user does not specify a default value, and all call sites supply the named parameter, there are two possible heuristics: - assumeNullable: mark the parameter as nullable, since the implicit default is `null`, even though the implicit default is never used. - assumeRequired: consider the parameter to be `@required`, ensuring that the implicit default will never be used. I've provisionally chosen `assumeRequired` as the default behavior. Functionality not yet implemented: - If `@required` is already present in the source code, this should override the heuristic; also it should not be added again. - If the parameter is already marked as nullable in the source code, this should override the heuristic. - Uses of `@required` should be translated to `required`. - If `@required` is already present in the source code, and a default value is supplied, the default value should be removed. - If the parameter is used in a way that demonstrates it was intended to be non-nullable (i.e. it appears in a place in unconditional control flow that would cause an exception to be thrown if it was null), this should override the heuristic and cause it to be marked as `@required`. Change-Id: I9f2ec63787fdb6215e6075ecfcc830ed9942b8b5 Reviewed-on: https://dart-review.googlesource.com/c/92532 Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
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