1481a806b7
Attempting to migrate the reader-conditional constructor to the overlay revealed that an overlay defn returning a :jolt/type-tagged map literal silently fails to bind during the seed mint: the guard around each prelude form swallows the load-time error, leaving the var unbound. This is the same reason every other tagged-value constructor (atom, volatile!, tagged-literal) is native, so reader-conditional is reclassified STAY-PRIMITIVE rather than a safe migration.
58 lines
3.3 KiB
Scheme
58 lines
3.3 KiB
Scheme
;; natives-reader.ss — reader/macro runtime-support natives: the #?() reader feature
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;; set, the reader-conditional + re-matcher tagged-map constructors, and macroexpand.
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;;
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;; Loaded late (after ns.ss): macroexpand forward-refs the runtime macro table
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;; (host-contract hc-macro?/hc-expand-1) + the analyzer ctx, resolved at call time
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;; after the spine loads. The hash / transient? / rseq / cat natives that used to
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;; live here moved to natives-misc, transients, natives-seq, and natives-transduce.
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;; --- reader feature set (for #?() conditionals) — mutable list of name strings,
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;; default jolt + default. __reader-features returns the strings; -set! replaces.
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(define nr-reader-features (list "jolt" "default"))
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(define (nr-reader-features-get) (list->cseq nr-reader-features))
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(define (nr-reader-features-set! names)
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(set! nr-reader-features
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(map (lambda (n) (cond ((keyword-t? n) (keyword-t-name n)) ((string? n) n) (else (jolt-pr-str n))))
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(seq->list (jolt-seq names))))
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jolt-nil)
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;; --- reader-conditional: a tagged map (reader-conditional? is an overlay
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;; tagged-value predicate that reads :jolt/type). STAYS NATIVE: building a
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;; :jolt/type-tagged map is part of the native value model — an overlay defn
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;; returning {:jolt/type ...} silently fails to bind during the seed mint (the
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;; guard around each prelude form swallows the load-time error), the same reason
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;; every other tagged-value constructor (atom/volatile!/tagged-literal) is native.
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;; re-matcher / re-find / re-groups are the stateful matcher API in regex.ss.
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(define nr-kw-type (keyword "jolt" "type"))
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(define nr-kw-rc (keyword "jolt" "reader-conditional"))
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(define nr-kw-form (keyword #f "form"))
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(define nr-kw-spl (keyword #f "splicing?"))
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(define (nr-reader-conditional form splicing?)
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(jolt-hash-map nr-kw-type nr-kw-rc nr-kw-form form nr-kw-spl splicing?))
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;; --- macroexpand-1 / macroexpand: expand a (quoted) call form via the runtime
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;; macro table (host-contract hc-macro?/hc-expand-1; forward-referenced, resolved
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;; at call time after the spine loads). macroexpand loops until the head is no
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;; longer a macro (subforms are not expanded, matching Clojure).
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(define (nr-macroexpand-1 form)
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(if (and (cseq? form) (cseq-list? form) (symbol-t? (seq-first form)))
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(let ((ctx (make-analyze-ctx (chez-current-ns))))
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(if (hc-macro? ctx (seq-first form)) (hc-expand-1 ctx form) form))
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form))
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(define (nr-macroexpand form)
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(let loop ((cur form))
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(let ((nxt (nr-macroexpand-1 cur))) (if (eq? cur nxt) cur (loop nxt)))))
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(def-var! "clojure.core" "__reader-features" nr-reader-features-get)
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(def-var! "clojure.core" "__reader-features-set!" nr-reader-features-set!)
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(def-var! "clojure.core" "reader-conditional" nr-reader-conditional)
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(def-var! "clojure.core" "macroexpand-1" nr-macroexpand-1)
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;; letfn is a special form (the analyzer lowers it to letrec*, checked before any
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;; macro), but on the JVM it is also a clojure.core macro that (resolve 'letfn)
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;; finds — like let / loop / fn here. Intern a var so resolution matches; the value
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;; is never invoked (the analyzer handles every (letfn …) form), and it is NOT
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;; marked a macro, so macroexpand leaves a letfn form alone (it is special).
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(def-var! "clojure.core" "letfn"
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(lambda args (jolt-throw (jolt-ex-info "letfn is a special form" (jolt-hash-map)))))
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(def-var! "clojure.core" "macroexpand" nr-macroexpand)
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