This prepares to make the name of an `Ident` optional to support abstract
identifiers derived from metavariables.
This is an unfortunate change to have to prepare for, since it complicates
how Idents are interpreted, but the alternative (a new object type) is not
good either. We'll see how this evolves.
DEV-13163
The previous commit introduced a duplicate `asg_from_toks`; this just makes
it available publicly for any tests that might utilize AIR to lower the
barrier to writing such tests and provide some guidance in doing so.
DEV-13162
This uses AIR---the ASG's proper public interface now---to construct the
graph for tests, just as all the other modern tests do. This is change
works towards encapsulating index operations (both creation and lookups) so
that the index can be moved off of Asg and into AIR, where it belongs. More
information on that and rationale to come.
DEV-13162
These have been a pain in the ass since TAMER began.
It seemed like a good idea at the time to have static code generated in this
way, but the lack of explicit dependencies just makes this a mess and works
against the operating theory of the system.
Furthermore, the _same_ static fragments were generated for each and every
map package.
There is still a post-link step (standalones) handled in XSLT; the
previously-static code has been moved there. This will eventually be
integrated into tameld itself, once TAMER has facilities for JS generation.
(This was discovered while trying to parent identifiers to packages.)
DEV-13162
This integrates the new topological sort, replacing the previous
implementation in the linker.
This will now allow encapsulating the graph, finally, and ensures that
future changes can be fully maintained within the `asg` module.
More cleanup will come over time.
DEV-13162
Historically, the ASG was better described as a "dependency graph",
containing only identifiers (which are simply called "symbols" in the
XSLT-based compiler). Consequently, it was appropriate for the graph to
have operations specific to identifiers. (Indeed, that's the only type of
object the graph supported.)
Much has changed since then. This cleans things up, and makes parenting
identifiers to root an _explicit_ operation. This will make it easier to
move forward with handling of scope, and importing identifiers into
packages, and removing `Source`, and so on.
DEV-13162
Mike Gerwitz