Refactor the extern injection interfaces: - Interpreter -> Injection, Compiler -> Injector - NewCompiler -> InjectorForInstance, Compile -> InjectedValue - SetInterpreter -> SetInjection - cuelang.org/go/cue/interpreter -> cuelang.org/go/cue/inject The current names are targetted at wasm but are not appropriate for more general injection schemes, such as `@embed`. The new Injector.InjectedValue method receives an *ExternAttr (containing the parent AST node and parsed attribute) instead of a pre-extracted name string. This moves name-related logic out of the generic externDecorator and into the specific injector implementations that need it (e.g. wasm). This will also allow injection logic to let the top level `@extern` attribute parameters influence the behavior of an extern attribute, because that information is available inside the `ExternAttr` type. We leave a forwarding package in cue/interpreter/embed so that we don't gratuitously break clients that are using embed.New; technically we'd be entitled to just rename it as the package API is noted as experimental, but given that embed users had been required to use `embed.New` explicitly, some soft landing seems better. The rest of the API is new and its renaming is unlikely to cause problems. The wasm package does not work with EvalV3 anyway, so moving it should hopefully not be an issue. Signed-off-by: Roger Peppe <rogpeppe@gmail.com> Change-Id: I75035e0b17d9857e38d60e06a8ff454da3889597 Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1235341 Reviewed-by: Marcel van Lohuizen <mpvl@gmail.com> TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>