jolt's own throw sites raised untyped Chez conditions with the class name buried
in an English message, so (class e) reported the opaque :object and only a broad
catch worked:
(class (try (Long/parseLong "xyz") (catch Throwable e e))) => :object
; JVM: java.lang.NumberFormatException
Raise typed throwables (jolt-host-throwable) at the Long/Double parse and
StringTokenizer sites so (class e) / .getMessage / a specific catch all reflect
the real class. And fold the exception supertype table (exception-parent) into
the one class graph: exception-isa? now resolves the simple name to its graph key
and asks jch-isa?, so exceptions and every other class share a single hierarchy.
Runtime only, no re-mint. make test green (0 new/stale), +2 corpus rows.
instance?, extend-protocol dispatch, isa?/supers/ancestors, and the exception
hierarchy each read their own hand-kept table, and those tables had drifted:
(instance? clojure.lang.Associative [1 2]) was true but a protocol extended to
Associative wouldn't dispatch to a vector; keyword/IFn and seq/Seqable had the
same split; (isa? ExceptionInfo RuntimeException) was false and
(supers NumberFormatException) was empty.
Add one FQN -> direct-supers graph (class-hierarchy.ss) and derive the views
from it. value-host-tags builds on the graph closure so a vector reports
Associative/Indexed/ILookup/Counted/Seqable, a keyword reports IFn, a seq
reports Seqable/List/Counted, etc. instance? now tests membership in that same
list, so it can't disagree with dispatch. canonical-host-tag recognizes any
modeled class (was a separate literal set missing Seqable/ILookup/...).
class-direct-supers unions the graph edges and class-supers returns the
transitive closure, so the exception hierarchy answers isa?/supers/ancestors.
The graph is open: jolt.host/register-class-supers! lets a library graft its
own classes on and get every view for free.
Runtime only, no re-mint. make test green (0 new/stale divergences), +3
JVM-certified corpus rows.
