tree bac1fe8ee98734ccd8a5d701eade54972f35967c
parent 4459434aaad93bbbd5c14ab310ed66d165dbed54
author Marcel van Lohuizen <mpvl@golang.org> 1617781257 +0200
committer Marcel van Lohuizen <mpvl@golang.org> 1617894492 +0000

cue: separate closedness for lists and structs

Before embedded scalars, it was fine to "overload" IsClosed
for Lists and Structs. With embedded scalars, however,
whether embedded list is open or closed as a list and struct
are two orthogonal concepts. The API and code needs to
reflect this.

This also holds for API users. There is now a new "Allows"
method on Value to determine if a certain selector
is "fillable" on a Value. The special selectors
AnyString and AnyIndex have been added to allow querying
the possibility of setting a value.

Once closedness of definitions is handled properly
AnyDefinition should be added as well (note that hidden
labels are always allowed).

This deprecates the IsClosed method.

Remove the internal IsClosed method to ensure that a
decision made on what to use in all cases.

Fixes #879

Change-Id: I40334c8254435503bbd59a4f5d725ca415ff03b6
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/9325
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>