Add `DartFileEditBuilder.addConstructorInsertion`, a replacement for
both `CorrectionUtils.prepareEnumNewConstructorLocation` and
`CorrectionUtils.prepareNewConstructorLocation`. Combining the two
APIs is made possible by adding enum support to _InsertionPreparer.
For example, constructors can be inserted after an enum value-list's
semicolon (if there is one), or after the last value (if there isn't).
Also:
* Refactor _InsertionPreparer a bit to be cleaner; in the constructor,
we determine whether we can grab the `NamedCompilationUnitMember`
members.
* Instead of storing a `_targetMember` as a field, which is only null-
checked, store a Boolean value for whether a target member was
found.
* Remove pre-nnbd support in `DartFileEditBuilder.writeParameter`.
Change-Id: I3e98ed906cf5ac82e464c502db5986d3761c3611
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/361624
Commit-Queue: Samuel Rawlins <srawlins@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Sam Rawlins
07c17fbb9f