e434356590
jolt-str-render-one and instance-check were each extended by a chain of set!-wrapping closures spread across ~10 and ~5 host files, so the real behavior of either was scattered and load-order-dependent. Give each a registry the base file owns: converters.ss/records-interop.ss define the registry plus a register-* helper, and each extending file registers one arm instead of capturing %prev and set!-ing the global. str-render arms are type-disjoint; instance-check arms run newest-first (the old outermost-wins order) and may return 'pass to defer. The string-token -> symbol normalization the natives-array arm did for every inner arm moves to the dispatcher head; array tokens stay strings for that arm to decide. jolt-ogib.14. Runtime-only shims, no re-mint.
56 lines
2.4 KiB
Scheme
56 lines
2.4 KiB
Scheme
;; vars as first-class objects — (var x) / #'x.
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;;
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;; The emitter lowers :the-var to (jolt-var ns name) — the rt.ss var-cell, which
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;; is now also a Clojure VAR value. var? / var-get / deref-of-var / var-as-IFn /
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;; var equality / pr-str(#'ns/name) operate on it. bound? is overridden natively
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;; in post-prelude.ss (the overlay reads (get v :root), nil on a record).
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;;
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;; Dynamic binding (binding / with-bindings* / var-set / thread-bound? /
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;; with-redefs) lives in dyn-binding.ss, which chains the var-read paths set up
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;; here.
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;;
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;; Loaded LAST (after natives-xform.ss): chains jolt-deref (atom/volatile arms)
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;; and the printers.
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(define (jolt-var-pred? x) (var-cell? x))
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;; the var's current root; unbound is an error (Clojure throws on an unbound var).
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(define (jolt-var-get v)
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(if (var-cell? v)
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(let ((r (var-cell-root v)))
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(if (eq? r jolt-unbound) (error #f "Unbound var" v) r))
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(error #f "var-get: not a var" v)))
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;; deref of a var -> its root.
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(define %v-deref jolt-deref)
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(set! jolt-deref (lambda (x) (if (var-cell? x) (jolt-var-get x) (%v-deref x))))
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;; a var is an IFn — invoking it invokes its root value ((var f) args -> (f args)).
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(define %v-invoke jolt-invoke)
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(set! jolt-invoke (lambda (f . args)
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(if (var-cell? f) (apply jolt-invoke (var-cell-root f) args) (apply %v-invoke f args))))
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;; two var cells are = iff same ns/name (Clojure var identity).
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(define %v-=2 jolt=2)
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(set! jolt=2 (lambda (a b)
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(cond ((var-cell? a) (and (var-cell? b)
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(string=? (var-cell-ns a) (var-cell-ns b))
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(string=? (var-cell-name a) (var-cell-name b))))
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((var-cell? b) #f)
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(else (%v-=2 a b)))))
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;; pr-str / str of a var -> #'ns/name.
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(define (var->str v) (string-append "#'" (var-cell-ns v) "/" (var-cell-name v)))
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(define %v-pr-str jolt-pr-str)
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(set! jolt-pr-str (lambda (x) (if (var-cell? x) (var->str x) (%v-pr-str x))))
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(define %v-pr-readable jolt-pr-readable)
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(set! jolt-pr-readable (lambda (x) (if (var-cell? x) (var->str x) (%v-pr-readable x))))
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(register-str-render! var-cell? var->str)
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;; bound? — native (the overlay's (get v :root) is nil on a var-cell record).
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(define (jolt-var-bound-one? v) (and (var-cell? v) (not (eq? (var-cell-root v) jolt-unbound))))
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(define (jolt-bound? . vars) (if (for-all jolt-var-bound-one? vars) #t #f))
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(def-var! "clojure.core" "var?" jolt-var-pred?)
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(def-var! "clojure.core" "var-get" jolt-var-get)
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(def-var! "clojure.core" "deref" jolt-deref)
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