47864403e8
Surfaced running the DB libraries (migratus) on the jolt db library: - java.sql.SQLException .getNextException / .getStackTrace / .printStackTrace on jolt throwables (conditions + ex-info) return nil/empty, so a library walking the exception chain doesn't crash. - java.net.URL ctor + .getProtocol (file/http), alongside the existing url shim. - A generic java.lang.ClassLoader: getSystemClassLoader / a thread's contextClassLoader resolve a named resource against the source roots (the same model as clojure.java.io/resource) — file: URL or nil. Thread/currentThread. These are generic host capabilities, not DB-specific. The jolt-lang/db next.jdbc surface now runs migratus far enough to connect, build the migrations table, and discover migrations; migratus's remaining dependency is java.nio.file (FileSystems/Path/PathMatcher glob), a JVM filesystem API kept out of core.
93 lines
5.1 KiB
Scheme
93 lines
5.1 KiB
Scheme
;; dot-forms.ss — generic dispatch for the `.` special-form / `.-field` desugar
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;; (jolt-kuic). The analyzer lowers (. target member arg*) and (.-field target)
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;; to a :host-call; the Chez emit routes a non-shimmed :host-call through
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;; record-method-dispatch. This file extends that dispatcher with the collection
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;; arms the interpreter's dispatch-member covers but the record/string base does
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;; not, with this precedence:
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;;
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;; * collection interop wins first — count/seq/nth/get/valAt/containsKey on a
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;; vector/map/set/seq/record (so (. {:count 9} count) is the entry count, 1,
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;; NOT the :count field).
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;; * field access — a "-name" member reads the field (records and maps).
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;; * map member — a stored fn is a method (called with self + args); any
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;; other value is returned as a field.
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;;
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;; Anything not recognized falls through to the previous dispatcher (jhost /
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;; number / regex / jrec protocol / string). Loaded LAST (after host-static.ss).
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;; A record (jrec) is jolt-map? here (records.ss makes it so) and a collection,
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;; so its protocol method (no dash, not a coll method) lands in the base.
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(define %dot-rmd record-method-dispatch)
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;; Vectors / maps / sets only (records are jolt-map? here). Raw seqs are excluded:
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;; coll-interop accepts some seq representations and not others (a
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;; plain (seq v) returns nil from .count, a lazy-seq returns the count), an
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;; inconsistency Chez's normalized cseq can't mirror — so a raw seq target falls
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;; through to the base dispatcher rather than risk a divergence the corpus would
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;; never exercise but a future case might.
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(define (dot-coll? obj)
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(or (jolt-vector? obj) (jolt-map? obj) (pset? obj)))
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;; Mirror coll-interop: return a one-element list boxing the result (so a jolt-nil
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;; result is still distinguishable from "not a collection method"), or #f.
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(define (dot-coll-method obj name args)
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(cond
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((string=? name "count") (list (jolt-count obj)))
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((string=? name "seq") (list (jolt-seq obj)))
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((string=? name "nth") (list (apply jolt-nth obj args)))
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((or (string=? name "get") (string=? name "valAt"))
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(list (apply jolt-get obj args)))
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((string=? name "containsKey") (list (jolt-contains? obj (car args))))
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;; (.iterator coll): a java.util.Iterator over the seq — for a map this is the
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;; entry iterator. Without this a map's .iterator falls into the map-as-object
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;; branch and is mis-read as a missing :iterator key (nil). Some libraries
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;; (e.g. malli's -vmap) iterate a map this way.
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((string=? name "iterator") (list (make-jiterator (jolt-seq obj))))
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(else #f)))
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;; Universal object-methods: on a
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;; non-record map these win OVER a field lookup, like dispatch-member. getMessage
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;; on an ex-info reads its :message (the one the corpus exercises); getCause reads
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;; :cause; toString/hashCode/equals round out the set. Returns a boxed result or
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;; #f. Strings/numbers/records/jhost keep the base dispatcher (it shims them).
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(define (dot-object-method obj name args)
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(cond
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((string=? name "getMessage")
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(list (if (jolt=2 (jolt-get obj jolt-kw-ex-type jolt-nil) jolt-kw-ex-info)
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(jolt-get obj jolt-kw-message jolt-nil)
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(jolt-str-render-one obj))))
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((string=? name "getCause") (list (jolt-get obj jolt-kw-cause jolt-nil)))
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;; java.sql.SQLException chaining — ex-info / host throwables don't chain.
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((string=? name "getNextException") (list jolt-nil))
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((string=? name "getStackTrace") (list (jolt-vector)))
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((string=? name "toString") (list (jolt-str-render-one obj)))
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((string=? name "hashCode") (list (jolt-hash obj)))
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((string=? name "equals") (list (if (jolt= obj (car args)) #t #f)))
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(else #f)))
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(set! record-method-dispatch
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(lambda (obj method-name rest-args)
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(let* ((rest (if (jolt-nil? rest-args) '() (seq->list rest-args)))
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(field? (and (> (string-length method-name) 0)
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(char=? (string-ref method-name 0) #\-)))
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(mname (if field?
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(substring method-name 1 (string-length method-name))
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method-name)))
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(cond
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;; (.getClass x) universal — the class token for any value, before the
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;; collection/map field-lookup arms below would read it as a missing key.
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((string=? method-name "getClass") (jolt-class obj))
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;; collection interop first (entry count / seq / nth / get / containsKey).
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((and (dot-coll? obj) (dot-coll-method obj mname rest))
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=> (lambda (box) (car box)))
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;; (.-field obj) / (. obj -field): field read on a record or map.
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(field? (jolt-get obj (keyword #f mname) jolt-nil))
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;; non-record map: a universal object-method (getMessage/...) wins first,
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;; then a stored procedure is a method (call with self), else the field.
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((and (jolt-map? obj) (not (jrec? obj)))
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(cond
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((dot-object-method obj mname rest) => car)
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(else
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(let ((v (jolt-get obj (keyword #f mname) jolt-nil)))
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(if (procedure? v) (apply jolt-invoke v obj rest) v)))))
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(else (%dot-rmd obj method-name rest-args))))))
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