Previously our MoveDestination methods only honored move statements whose
endpoints were module calls, module instances, or resources.
Now we'll additionally handle when the endpoints are individual resource
instances. This situation only applies to
AbsResourceInstance.MoveDestination because no other objects can be
contained inside of a resource instance.
This completes all of the MoveDestination cases for all supported move
statement types and moveable object types.
Previously our MoveDestination methods only honored move statements whose
endpoints were module calls or module instances.
Now we'll additionally handle when the endpoints are whole resource
addresses. This includes both renaming resource blocks and moving resource
blocks into or out of child modules.
This doesn't yet include endpoints that are specific resource _instances_,
which will follow in a subsequent commit. For the moment that situation
will always indicate a non-match.
This is a subset of the MoveDestination behavior for AbsResource and
AbsResourceInstance which deals with source and destination addresses that
refer to module calls or module instances.
They both work by delegating to ModuleInstance.MoveDestination and then
applying the same resource or resource instance address to the
newly-chosen module instance address, thus ensuring that when we move
a module we also move all of the resources inside that module in the same
way.
This doesn't yet include support for moving between specific resource or
resource instance addresses; that'll follow later. This commit should have
enough logic to support moving between module names and module instance
keys, including any module calls or resources nested within.
This method encapsulates the move-processing rules for applying move
statements to ModuleInstance addresses. It honors both module call moves
and module instance moves by trying to find a subsequence of the input
that matches the "from" endpoint and then, if found, replacing it with
the "to" endpoint while preserving the prefix and suffix around the match,
if any.
This is a whole lot of nothing right now, just stubbing out some control
flow that ultimately just leads to TODOs that cause it to do nothing at
all.
My intent here is to get this cross-cutting skeleton in place and thus
make it easier for us to collaborate on adding the meat to it, so that
it's more likely we can work on different parts separately and still get
a result that tessellates.
We previously built out addrs.UnifyMoveEndpoints with a different
implementation strategy in mind, but that design turns out to not be
viable because it forces us to move to AbsMoveable addresses too soon,
before we've done the analysis required to identify chained and nested
moves.
Instead, UnifyMoveEndpoints will return a new type MoveEndpointInModule
which conceptually represents a matching pattern which either matches or
doesn't match a particular AbsMoveable. It does this by just binding the
unified relative address from the MoveEndpoint to the module where it
was declared, and thus allows us to distinguish between the part of the
module path which applies to any instances of the given modules vs. the
user-specified part which must identify particular module instances.
Martin Atkins