Derive class identity from one hierarchy graph
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.
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204
host/chez/java/class-hierarchy.ss
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204
host/chez/java/class-hierarchy.ss
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;; class-hierarchy.ss — one JVM class/interface graph, the single source of truth
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;; for every "what classes does this satisfy" question. value-host-tags (protocol
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;; dispatch), instance?, isa?/supers/ancestors, and the exception hierarchy all
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;; derive from the ONE table here instead of maintaining parallel hand-kept lists
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;; that drift apart.
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;;
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;; The graph is keyed by canonical (FQN) class name -> its DIRECT super
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;; interfaces/classes (also FQN). Transitivity is computed (jch-closure), so a row
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;; lists only what a class directly extends/implements, matching the JVM source.
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;;
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;; It is OPEN: a library registers a class and its supers with
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;; jolt.host/register-class-supers! (plus a class-arm in host-class.ss to map its
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;; values to that class name), and every derived view picks the class up with no
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;; core change. Loaded before records.ss so value-host-tags can derive from it.
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;; canonical-name -> list of direct super canonical-names. Mutable + extensible.
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(define jvm-class-parents (make-hashtable string-hash string=?))
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;; closure cache, invalidated whenever the graph is extended.
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(define jch-closure-cache (make-hashtable string-hash string=?))
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(define jch-tags-cache (make-hashtable string-hash string=?))
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;; Merge direct supers for a class (union with any already registered). Public so
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;; libraries can graft their own classes onto the modeled hierarchy.
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(define (jch-register-supers! name supers)
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(let ((cur (hashtable-ref jvm-class-parents name '())))
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(hashtable-set! jvm-class-parents name
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(let add ((ss supers) (acc cur))
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(cond ((null? ss) acc)
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((member (car ss) acc) (add (cdr ss) acc))
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(else (add (cdr ss) (append acc (list (car ss)))))))))
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(hashtable-clear! jch-closure-cache)
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(hashtable-clear! jch-tags-cache))
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(define (jch-direct-supers name) (hashtable-ref jvm-class-parents name '()))
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;; transitive supers of NAME (canonical), excluding NAME and Object; Object is the
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;; universal root supplied by callers. Breadth-first, deduped, stable order.
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(define (jch-closure name)
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(or (hashtable-ref jch-closure-cache name #f)
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(let ((result
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(let loop ((pending (jch-direct-supers name)) (seen '()))
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(cond ((null? pending) (reverse seen))
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((member (car pending) seen) (loop (cdr pending) seen))
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(else (loop (append (jch-direct-supers (car pending)) (cdr pending))
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(cons (car pending) seen)))))))
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(hashtable-set! jch-closure-cache name result)
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result)))
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(define (jch-last-segment s)
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(let loop ((i (- (string-length s) 1)))
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(cond ((< i 0) s)
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((char=? (string-ref s i) #\.) (substring s (+ i 1) (string-length s)))
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((char=? (string-ref s i) #\$) (substring s (+ i 1) (string-length s)))
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(else (loop (- i 1))))))
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;; The protocol-dispatch / instance? tag list for a value of class NAME: the class
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;; and its whole ancestry, each in BOTH canonical and simple spelling (extend-protocol
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;; and instance? accept either "Associative" or "clojure.lang.Associative"), plus
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;; "Object". Memoized — this is on the hot protocol-dispatch path.
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(define (jch-tags name)
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(or (hashtable-ref jch-tags-cache name #f)
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(let* ((chain (cons name (jch-closure name)))
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(result
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(let build ((cs chain) (acc '()))
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(if (null? cs)
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(reverse (cons "Object" acc))
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(let* ((fqn (car cs))
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(simple (jch-last-segment fqn))
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(acc1 (if (member fqn acc) acc (cons fqn acc)))
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(acc2 (if (or (string=? simple fqn) (member simple acc1))
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acc1 (cons simple acc1))))
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(build (cdr cs) acc2))))))
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(hashtable-set! jch-tags-cache name result)
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result)))
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;; Is WANTED (canonical or simple) the class CHILD (canonical) or one of its
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;; ancestors? Object is every class's root. Matched by full name or last segment so
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;; "IOException" and "java.io.IOException" both hit.
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(define (jch-isa? child wanted)
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(let ((wseg (jch-last-segment wanted)))
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(or (string=? wanted "java.lang.Object") (string=? wanted "Object")
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(let loop ((names (cons child (jch-closure child))))
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(cond ((null? names) #f)
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((or (string=? wanted (car names))
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(string=? wseg (jch-last-segment (car names)))) #t)
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(else (loop (cdr names))))))))
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;; Does the graph model WANTED at all (as a class or as any class's ancestor)? Used
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;; by instance? to decide between a definitive #f and 'pass (defer to other arms).
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(define jch-known-cache #f)
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(define (jch-known? wanted)
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(when (not jch-known-cache)
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(set! jch-known-cache (make-hashtable string-hash string=?))
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(let-values (((keys vals) (hashtable-entries jvm-class-parents)))
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(vector-for-each
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(lambda (k supers)
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(hashtable-set! jch-known-cache k #t)
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(hashtable-set! jch-known-cache (jch-last-segment k) #t)
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(for-each (lambda (s)
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(hashtable-set! jch-known-cache s #t)
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(hashtable-set! jch-known-cache (jch-last-segment s) #t))
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supers))
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keys vals)))
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(or (hashtable-ref jch-known-cache wanted #f)
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(hashtable-ref jch-known-cache (jch-last-segment wanted) #f)))
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;; A register also invalidates the known-name cache.
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(define jch-register-supers!-inner jch-register-supers!)
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(set! jch-register-supers!
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(lambda (name supers)
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(set! jch-known-cache #f)
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(jch-register-supers!-inner name supers)))
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;; ---- seed the built-in graph: direct supers only, faithful to the JVM ---------
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;; core clojure.lang interfaces
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(jch-register-supers! "clojure.lang.IPersistentCollection" '("clojure.lang.Seqable"))
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(jch-register-supers! "clojure.lang.ISeq" '("clojure.lang.IPersistentCollection"))
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(jch-register-supers! "clojure.lang.Associative" '("clojure.lang.IPersistentCollection" "clojure.lang.ILookup"))
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(jch-register-supers! "clojure.lang.IPersistentStack" '("clojure.lang.IPersistentCollection"))
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(jch-register-supers! "clojure.lang.IPersistentVector" '("clojure.lang.Associative" "clojure.lang.Sequential"
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"clojure.lang.IPersistentStack" "clojure.lang.Reversible"
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"clojure.lang.Indexed"))
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(jch-register-supers! "clojure.lang.IPersistentMap" '("java.lang.Iterable" "clojure.lang.Associative" "clojure.lang.Counted"))
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(jch-register-supers! "clojure.lang.IPersistentSet" '("clojure.lang.IPersistentCollection" "clojure.lang.Counted"))
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(jch-register-supers! "clojure.lang.IPersistentList" '("clojure.lang.Sequential" "clojure.lang.IPersistentStack"))
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(jch-register-supers! "clojure.lang.IObj" '("clojure.lang.IMeta"))
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(jch-register-supers! "clojure.lang.IFn" '("java.lang.Runnable" "java.util.concurrent.Callable"))
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(jch-register-supers! "clojure.lang.Fn" '("clojure.lang.IFn"))
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(jch-register-supers! "clojure.lang.AFn" '("clojure.lang.IFn"))
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(jch-register-supers! "clojure.lang.AFunction" '("clojure.lang.AFn" "clojure.lang.Fn"))
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;; java.util collection interfaces
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(jch-register-supers! "java.util.List" '("java.util.Collection"))
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(jch-register-supers! "java.util.Set" '("java.util.Collection"))
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(jch-register-supers! "java.util.Collection" '("java.lang.Iterable"))
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;; concrete collection classes
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(jch-register-supers! "clojure.lang.APersistentVector" '("clojure.lang.IPersistentVector" "java.util.List"))
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(jch-register-supers! "clojure.lang.PersistentVector" '("clojure.lang.APersistentVector" "clojure.lang.IObj"
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"java.util.List" "java.lang.Comparable"))
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(jch-register-supers! "clojure.lang.APersistentMap" '("clojure.lang.IPersistentMap" "java.util.Map"))
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(jch-register-supers! "clojure.lang.PersistentArrayMap" '("clojure.lang.APersistentMap" "clojure.lang.IObj"))
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(jch-register-supers! "clojure.lang.PersistentHashMap" '("clojure.lang.APersistentMap" "clojure.lang.IObj"))
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(jch-register-supers! "clojure.lang.PersistentTreeMap" '("clojure.lang.APersistentMap" "clojure.lang.IObj" "clojure.lang.Sorted" "clojure.lang.Reversible"))
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(jch-register-supers! "clojure.lang.APersistentSet" '("clojure.lang.IPersistentSet" "java.util.Set"))
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(jch-register-supers! "clojure.lang.PersistentHashSet" '("clojure.lang.APersistentSet" "clojure.lang.IObj"))
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(jch-register-supers! "clojure.lang.PersistentTreeSet" '("clojure.lang.APersistentSet" "clojure.lang.IObj" "clojure.lang.Sorted" "clojure.lang.Reversible"))
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(jch-register-supers! "clojure.lang.ASeq" '("clojure.lang.ISeq" "clojure.lang.Sequential" "java.util.List"))
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(jch-register-supers! "clojure.lang.PersistentList" '("clojure.lang.ASeq" "clojure.lang.IPersistentList" "clojure.lang.Counted"))
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(jch-register-supers! "clojure.lang.PersistentList$EmptyList" '("clojure.lang.PersistentList"))
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(jch-register-supers! "clojure.lang.LazySeq" '("clojure.lang.ISeq" "clojure.lang.Sequential" "java.util.List" "clojure.lang.IObj"))
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(jch-register-supers! "clojure.lang.Cons" '("clojure.lang.ASeq"))
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(jch-register-supers! "clojure.lang.PersistentQueue" '("clojure.lang.IPersistentList" "clojure.lang.IPersistentCollection" "java.util.Collection"))
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;; scalars / named / callable
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(jch-register-supers! "clojure.lang.Keyword" '("clojure.lang.IFn" "clojure.lang.Named" "java.lang.Comparable"))
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(jch-register-supers! "clojure.lang.Symbol" '("clojure.lang.IObj" "clojure.lang.IFn" "clojure.lang.Named" "java.lang.Comparable"))
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(jch-register-supers! "clojure.lang.Var" '("clojure.lang.IDeref" "clojure.lang.IFn"))
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(jch-register-supers! "clojure.lang.Atom" '("clojure.lang.IDeref"))
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(jch-register-supers! "clojure.lang.Ratio" '("java.lang.Number" "java.lang.Comparable"))
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(jch-register-supers! "clojure.lang.BigInt" '("java.lang.Number"))
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(jch-register-supers! "java.lang.String" '("java.lang.CharSequence" "java.lang.Comparable"))
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(jch-register-supers! "java.lang.Long" '("java.lang.Number" "java.lang.Comparable"))
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(jch-register-supers! "java.lang.Integer" '("java.lang.Number" "java.lang.Comparable"))
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(jch-register-supers! "java.lang.Double" '("java.lang.Number" "java.lang.Comparable"))
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(jch-register-supers! "java.lang.Float" '("java.lang.Number" "java.lang.Comparable"))
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(jch-register-supers! "java.math.BigDecimal" '("java.lang.Number" "java.lang.Comparable"))
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(jch-register-supers! "java.math.BigInteger" '("java.lang.Number" "java.lang.Comparable"))
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(jch-register-supers! "java.lang.Boolean" '("java.lang.Comparable"))
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(jch-register-supers! "java.lang.Character" '("java.lang.Comparable"))
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(jch-register-supers! "java.util.UUID" '("java.lang.Comparable"))
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;; exception hierarchy (folds in the former exception-parent table)
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(jch-register-supers! "java.lang.Exception" '("java.lang.Throwable"))
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(jch-register-supers! "java.lang.RuntimeException" '("java.lang.Exception"))
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(jch-register-supers! "clojure.lang.ExceptionInfo" '("java.lang.RuntimeException" "clojure.lang.IExceptionInfo"))
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(jch-register-supers! "java.lang.IllegalArgumentException" '("java.lang.RuntimeException"))
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(jch-register-supers! "clojure.lang.ArityException" '("java.lang.IllegalArgumentException"))
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(jch-register-supers! "java.lang.NumberFormatException" '("java.lang.IllegalArgumentException"))
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(jch-register-supers! "java.lang.IllegalStateException" '("java.lang.RuntimeException"))
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(jch-register-supers! "java.lang.UnsupportedOperationException" '("java.lang.RuntimeException"))
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(jch-register-supers! "java.lang.ArithmeticException" '("java.lang.RuntimeException"))
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(jch-register-supers! "java.lang.NullPointerException" '("java.lang.RuntimeException"))
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(jch-register-supers! "java.lang.ClassCastException" '("java.lang.RuntimeException"))
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(jch-register-supers! "java.lang.IndexOutOfBoundsException" '("java.lang.RuntimeException"))
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(jch-register-supers! "java.util.ConcurrentModificationException" '("java.lang.RuntimeException"))
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(jch-register-supers! "java.util.NoSuchElementException" '("java.lang.RuntimeException"))
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(jch-register-supers! "java.io.UncheckedIOException" '("java.lang.RuntimeException"))
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(jch-register-supers! "java.time.DateTimeException" '("java.lang.RuntimeException"))
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(jch-register-supers! "java.time.format.DateTimeParseException" '("java.time.DateTimeException"))
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(jch-register-supers! "java.lang.InterruptedException" '("java.lang.Exception"))
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(jch-register-supers! "java.io.IOException" '("java.lang.Exception"))
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(jch-register-supers! "java.io.InterruptedIOException" '("java.io.IOException"))
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(jch-register-supers! "java.io.FileNotFoundException" '("java.io.IOException"))
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(jch-register-supers! "java.io.UnsupportedEncodingException" '("java.io.IOException"))
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(jch-register-supers! "java.net.UnknownHostException" '("java.io.IOException"))
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(jch-register-supers! "java.net.SocketException" '("java.io.IOException"))
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(jch-register-supers! "java.net.ConnectException" '("java.net.SocketException"))
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(jch-register-supers! "java.net.SocketTimeoutException" '("java.io.InterruptedIOException"))
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(jch-register-supers! "java.net.MalformedURLException" '("java.io.IOException"))
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(jch-register-supers! "javax.net.ssl.SSLException" '("java.io.IOException"))
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(jch-register-supers! "java.lang.Error" '("java.lang.Throwable"))
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(jch-register-supers! "java.lang.AssertionError" '("java.lang.Error"))
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;; Throwable's only super is Object (universal), so no row needed for it.
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;; Public seam: libraries extend the modeled hierarchy.
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(def-var! "jolt.host" "register-class-supers!"
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(lambda (name supers) (jch-register-supers! name (seq->list supers)) jolt-nil))
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