5d0989a860
Further clojure.core.cache fixes (198 -> 257 of its assertions): - delay: a throwing body re-ran on every force and never became realized?. Run it once like Clojure's Delay — cache the exception, mark realized, re-throw the same on each deref. Fixes value-fn memoization / cache-stampede protection. - deftype/defrecord: a method name appearing in two protocols with different arities (data.priority-map's seq is in IPersistentMap [this] AND Sorted [this asc]) registered per-protocol and shadowed; merge clauses by name across all protocols into one multi-arity fn. - empty?/peek/pop (IPersistentStack) dispatch through a deftype's methods; (= a- deftype other) uses its equiv method (so caches compare to their backing map); seq handles a host iterator (iterator-seq over .iterator). - pop of an empty PersistentQueue returns it, like the JVM (was an error). JVM-certified corpus rows. make test + shakesmoke green.
540 lines
26 KiB
Clojure
540 lines
26 KiB
Clojure
;; clojure.core — macro tier. Macros expressed in Clojure (defmacro + syntax-quote).
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;; Loaded after the fn tiers, so a macro here may use any already-frozen core
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;; fn/macro.
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;;
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;; IMPORTANT — only macros NOT used by the self-hosted compiler (jolt-core/jolt/*)
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;; or by the earlier overlay tiers belong here; those (and/or/when/when-not/
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;; when-let/cond/case/doseq/declare/cond->/->) must stay available before this
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;; tier loads, so they remain host primitives for now. Everything here is user-facing.
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;;
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;; Migration: remove the host core-X macro fn AND its core-macro-names entry when
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;; moving a macro here (defmacro installs the :macro flag itself).
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(defmacro comment [& body] nil)
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;; with-out-str: capture everything the body prints to *out* and return it as a
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;; string. __with-out-str (clojure.core) runs the thunk with the output captured.
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(defmacro with-out-str [& body]
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`(__with-out-str (fn* [] ~@body)))
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;; defmulti/defmethod are sugar over defmulti-setup/defmethod-setup (ctx-capturing
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;; clojure.core fns) so they compile as plain invokes. name/mm are passed quoted;
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;; the dispatch fn, options, and dispatch value evaluate normally, and the method
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;; body becomes a compiled (fn …).
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;; Clojure allows (defmulti name docstring? attr-map? dispatch-fn & options);
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;; drop a leading docstring and/or attr-map so the dispatch fn isn't mistaken for
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;; one (migratus's multimethods carry docstrings).
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(defmacro defmulti [name & args]
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(let [args (if (string? (first args)) (rest args) args)
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args (if (and (map? (first args)) (not (symbol? (first args)))) (rest args) args)
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dispatch (first args)
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opts (rest args)]
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`(defmulti-setup (quote ~name) ~dispatch ~@opts)))
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(defmacro defmethod [mm dispatch-val & fn-tail]
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`(defmethod-setup (quote ~mm) ~dispatch-val (fn ~@fn-tail)))
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;; Multimethod table ops: a multimethod's method table lives on its
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;; VAR (the value is just the dispatch closure), so these pass the name quoted
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;; to ctx-capturing setups — the same shape as defmulti/defmethod above.
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(defmacro prefer-method [mm dval-a dval-b]
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`(prefer-method-setup (quote ~mm) ~dval-a ~dval-b))
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(defmacro remove-method [mm dval]
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`(remove-method-setup (quote ~mm) ~dval))
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(defmacro remove-all-methods [mm]
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`(remove-all-methods-setup (quote ~mm)))
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;; methods/get-method take the multimethod VALUE (Clojure semantics); the setup
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;; maps it back to its var via the registry, so a bare multifn ref works from a
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;; compiled fn in any namespace.
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(defmacro get-method [mm dval]
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`(get-method-setup ~mm ~dval))
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(defmacro methods [mm]
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`(methods-setup ~mm))
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;; prefers reads the store off the VAR (the multifn value can't carry it) —
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;; same symbol-passing shape as the other multimethod table ops.
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(defmacro prefers [mm]
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`(prefers-setup (quote ~mm)))
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;; instance?: class names don't evaluate to values on jolt, so the type arg is
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;; passed quoted to the ctx-capturing checker; the value evaluates normally.
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;; A LIST in type position is a class-valued expression (e.g. Selmer's
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;; (Class/forName "[C")) — evaluate it instead.
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(defmacro instance? [t x]
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(if (seq? t)
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`(instance-check ~t ~x)
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`(instance-check (quote ~t) ~x)))
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;; Single-threaded host: evaluate the monitor expr (for its effects, matching
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;; Clojure's evaluation order) and the body — no lock to take.
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(defmacro locking [x & body]
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`(do ~x ~@body))
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;; defonce: define name only if it isn't already bound to a non-nil root;
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;; returns the existing var untouched otherwise.
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;; time: evaluate expr, print the elapsed wall-clock, return the value.
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;; current-time-ms is the host's monotonic clock.
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(defmacro time [expr]
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`(let [start# (current-time-ms)
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ret# ~expr]
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(println (str "Elapsed time: " (- (current-time-ms) start#) " msecs"))
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ret#))
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;; with-redefs: temporary root rebinding, restored on exit (incl. throw).
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;; Builds (hash-map (var n1) v1 ...) — a call form, since map-literal forms
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;; can't carry call forms as keys.
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(defmacro with-redefs [bindings & body]
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(let [pairs (reduce (fn [acc p] (conj (conj acc `(var ~(first p))) (second p)))
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[] (partition 2 bindings))]
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`(with-redefs-fn (hash-map ~@pairs) (fn [] ~@body))))
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;; Fresh free-standing var cells bound as locals; read/write with
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;; var-get/var-set. The cells come from the host seam __local-var.
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(defmacro with-local-vars [bindings & body]
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(let [binds (reduce (fn [acc p] (conj (conj acc (first p)) `(__local-var ~(second p))))
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[] (partition 2 bindings))]
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`(let [~@binds] ~@body)))
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;; Canonical recursive expansion; closing goes through the host seam __close
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;; (a map-like value's :close fn or a host file — no .close interop here).
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(defmacro with-open [bindings & body]
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(if (zero? (count bindings))
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`(do ~@body)
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`(let [~(first bindings) ~(second bindings)]
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(try
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(with-open ~(vec (drop 2 bindings)) ~@body)
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(finally (__close ~(first bindings)))))))
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;; jolt numbers are doubles — there is no BigDecimal math context, so the
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;; precision (and optional :rounding mode) is accepted and ignored.
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(defmacro with-precision [precision & exprs]
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(let [body (if (= :rounding (first exprs)) (drop 2 exprs) exprs)]
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`(do ~@body)))
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(defmacro with-bindings [binding-map & body]
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`(with-bindings* ~binding-map (fn [] ~@body)))
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(defmacro bound-fn [& fntail]
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`(bound-fn* (fn ~@fntail)))
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(defmacro defonce [name expr]
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;; only def when the var has no root value. In a top-level (do ...) the name is
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;; already interned (an unbound cell) by the time this runs, so check bound? —
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;; var-get would throw on the unbound cell.
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`(let [v# (resolve (quote ~name))]
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(if (and v# (bound? v#))
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v#
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(def ~name ~expr))))
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;; Single arglist (Jolt defmacro is single-arity); the optional else defaults nil
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;; via rest-destructuring.
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(defmacro if-not [test then & [else]]
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`(if (not ~test) ~then ~else))
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;; Conditional binding macros: the name is bound ONLY in the taken branch (the
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;; auto-gensym temp# tests the value; the else/empty branch sees the surrounding
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;; scope). temp# is a single template-local gensym — referenced twice, same symbol.
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(defmacro if-let [bindings then & [else]]
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(let [form (bindings 0) tst (bindings 1)]
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`(let [temp# ~tst]
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(if temp# (let [~form temp#] ~then) ~else))))
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;; when-let lives in 00-syntax (not here): 20-coll uses it, which loads before this tier.
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(defmacro if-some [bindings then & [else]]
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(let [form (bindings 0) tst (bindings 1)]
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`(let [temp# ~tst]
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(if (some? temp#) (let [~form temp#] ~then) ~else))))
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(defmacro when-some [bindings & body]
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(let [form (bindings 0) tst (bindings 1)]
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`(let [temp# ~tst]
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(if (some? temp#) (let [~form temp#] ~@body) nil))))
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(defmacro while [test & body]
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`(loop [] (when ~test ~@body (recur))))
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(defmacro dotimes [bindings & body]
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(let [i (bindings 0) n (bindings 1)]
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`(let [n# ~n]
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(loop [~i 0]
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(when (< ~i n#) ~@body (recur (inc ~i)))))))
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;; A fresh jolt symbol inside a macro body: a bare (gensym) returns a host symbol
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;; the destructurer rejects, so round-trip through str.
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(defn- fresh-sym [] (symbol (str (gensym))))
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;; Lazy-safe: take only the head via first (Clojure uses (seq coll), but Jolt's
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;; eager seq would realize an infinite coll like (repeat nil) and hang).
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(defmacro when-first [bindings & body]
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(let [x (bindings 0) coll (bindings 1)]
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`(when-let [~x (first ~coll)] ~@body)))
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;; doto threads a single fresh-bound value as the first arg of each form (side
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;; effects), returning the value. A shared explicit gensym is needed because the
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;; forms are built outside the let's template.
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(defmacro doto [x & forms]
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(let [g (fresh-sym)
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steps (map (fn [f] (if (seq? f) (apply list (first f) g (rest f)) (list f g))) forms)]
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`(let [~g ~x] ~@steps ~g)))
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;; Threading-with-rebinding macros. The binding pairs are spliced into a TEMPLATE
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;; vector (so core-let sees a tuple form, not a runtime pvec value).
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(defn- thread-binds [g steps]
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(reduce (fn [acc s] (conj (conj acc g) s)) [] (butlast steps)))
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(defmacro as-> [expr name & forms]
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(let [pairs (reduce (fn [acc f] (conj (conj acc name) f)) [] (butlast forms))]
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`(let [~name ~expr ~@pairs] ~(if (empty? forms) name (last forms)))))
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(defmacro some-> [expr & forms]
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(let [g (fresh-sym)
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steps (map (fn [f] `(if (nil? ~g) nil (-> ~g ~f))) forms)]
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`(let [~g ~expr ~@(thread-binds g steps)] ~(if (empty? steps) g (last steps)))))
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(defmacro some->> [expr & forms]
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(let [g (fresh-sym)
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steps (map (fn [f] `(if (nil? ~g) nil (->> ~g ~f))) forms)]
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`(let [~g ~expr ~@(thread-binds g steps)] ~(if (empty? steps) g (last steps)))))
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(defmacro cond->> [expr & clauses]
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(let [g (fresh-sym)
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steps (map (fn [pair] `(if ~(first pair) (->> ~g ~(second pair)) ~g))
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(partition 2 clauses))]
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`(let [~g ~expr ~@(thread-binds g steps)] ~(if (empty? steps) g (last steps)))))
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(defmacro assert [x & [message]]
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(let [msg (if message message (str "Assert failed: " (pr-str x)))]
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`(when-not ~x (throw (ex-info ~msg {})))))
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;; (pvalues e1 e2 ...) — each expression evaluated in parallel (pcalls).
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(defmacro pvalues [& exprs]
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`(pcalls ~@(map (fn [e] `(fn [] ~e)) exprs)))
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(defmacro delay [& body]
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`(make-delay (fn [] ~@body)))
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(defmacro future [& body]
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`(future-call (fn [] ~@body)))
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;; Build the fn* form via a template (a reader-list array): cons/list in a macro
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;; body produce a plist the evaluator can't call as a form.
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;; letfn is a primitive special form (analyze-letfn -> letrec*), not a macro: its
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;; fns are mutually recursive, which a (let* …) expansion cannot express. Defining
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;; it as a macro would shadow the special once macroexpansion runs first (the
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;; canonical order), so it is intentionally NOT a macro here.
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;; Dynamic binding: install a thread-binding frame of var->value (array-map keeps
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;; var-get happy, unlike a phm), restore on exit.
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(defmacro binding [bindings & body]
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(let [pairs (reduce (fn [acc p] (conj (conj acc `(var ~(first p))) (second p)))
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[] (partition 2 bindings))]
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`(let* [frame# (array-map ~@pairs)]
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(push-thread-bindings frame#)
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(try (do ~@body) (finally (pop-thread-bindings))))))
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;; condp: clauses are test-expr result-expr, or test-expr :>> result-fn (calls
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;; result-fn on the truthy (pred test-expr value)); a lone trailing expr is the
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;; default. The recursive emit builds a nested if chain.
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(defmacro condp [pred expr & clauses]
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(let [gp (fresh-sym) ge (fresh-sym)
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emit (fn emit [args]
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(let [n (if (= :>> (second args)) 3 2)
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clause (take n args)
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more (drop n args)
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cn (count clause)]
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(cond
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(= 0 cn) `(throw (ex-info (str "No matching clause: " ~ge) {}))
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(= 1 cn) (first clause)
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(= 2 cn) `(if (~gp ~(first clause) ~ge) ~(second clause) ~(emit more))
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:else `(if-let [p# (~gp ~(first clause) ~ge)]
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(~(nth clause 2) p#)
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~(emit more)))))]
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`(let [~gp ~pred ~ge ~expr] ~(emit clauses))))
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;; --- protocols, records, types ---------------------------------------------
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;; These emit Jolt's protocol/type special forms (protocol-dispatch,
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;; register-method, make-reified, deftype).
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;; Group a flat seq that starts with a head symbol followed by its list specs
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;; into [[head spec spec ...] ...] runs. Used by extend-protocol and defrecord.
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(defn- group-by-head [items]
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;; nil is a valid extension head (extend-protocol P ... nil (m [x] ...)).
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(reduce (fn [acc x]
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(if (or (symbol? x) (nil? x))
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(conj acc [x])
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(conj (pop acc) (conj (peek acc) x))))
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[] items))
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;; deftype is sugar over make-deftype-ctor (a ctx-capturing clojure.core fn that
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;; bakes the ns-qualified type tag at def time) plus extend-type for any inline
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;; protocol methods — so it compiles as a plain (do …). Each method body sees the
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;; type's fields, bound from the instance (the method's first param), matching
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;; Clojure's deftype scope. defrecord (below) expands to a bodyless (deftype …) and
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;; handles its own methods, so this also serves the no-body case.
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(defmacro deftype [tname fields & body]
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;; strip ^meta off the type name and fields (the reader yields a (with-meta sym m)
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;; form for e.g. (deftype ^{:doc …} Foo …)), so (name …) sees a bare symbol.
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(let [unwrap (fn [x] (if (and (seq? x) (symbol? (first x)) (= "with-meta" (name (first x))))
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(second x) x))
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tname (unwrap tname)
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fields (map unwrap fields)
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arrow (symbol (str "->" (name tname)))
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;; a seq of field keywords; spliced into a vector LITERAL below ([~@…]) so
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;; the analyzer sees a vector form, not a runtime pvec value.
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field-kws (map (fn [f] (keyword (name f))) fields)
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;; per-field TYPE HINT: ^Vec3 origin -> "Vec3" (a record type
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;; name), ^:num x -> "num", else nil. Lets the inference know a field's
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;; exact type up front, so reading it back carries that type (not :any) —
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;; the key to fast nested-record code. Spliced as a vector literal too.
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field-tags (map (fn [f] (let [mt (meta f)]
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(cond (and mt (:tag mt)) (name (:tag mt)) ; symbol or string -> string
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(and mt (:num mt)) "num"
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:else nil)))
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fields)
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;; per-field MUTABILITY: ^:unsynchronized-mutable / ^:volatile-
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;; mutable marks a field set!-able. A type with any mutable field opts out
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;; of the immutable shape-rec layout and uses the mutable table form, so
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;; set! can mutate it (the ctor reads this vector). Spliced as a literal.
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field-muts (map (fn [f] (let [mt (meta f)]
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(if (and mt (or (:unsynchronized-mutable mt)
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(:volatile-mutable mt)))
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true false)))
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fields)
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;; mutable field symbols (^:unsynchronized-mutable / ^:volatile-mutable):
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;; (set! field v) in a method body lowers to (set! (.-field inst) v), the
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;; in-place field write the analyzer compiles to jolt-set-field!.
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mutable-syms (map first (filter second (map vector fields field-muts)))
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mutable? (fn [s] (boolean (some (fn [m] (= m s)) mutable-syms)))
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rewrite-set (fn rw [inst form]
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(cond
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(and (seq? form) (seq form) (symbol? (first form))
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(= "set!" (name (first form)))
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(symbol? (second form)) (mutable? (second form)))
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(list 'set! (list (symbol (str ".-" (name (second form)))) inst)
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(rw inst (nth form 2)))
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(seq? form) (map (fn [x] (rw inst x)) form)
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(vector? form) (mapv (fn [x] (rw inst x)) form)
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:else form))
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;; inline impls register for dispatch but are NOT extenders of the
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;; protocol (the JVM compiles them into the class) — register-inline-method,
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;; not extend-type.
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;; build one method clause (argv + field-bound body) from a method spec.
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;; The clause is DATA, not a syntax-quote: a body that is itself a syntax-
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;; quote would have its ~unquotes consumed a level early if re-spliced.
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mk-clause (fn [spec]
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(let [argv (nth spec 1)
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inst (first argv)
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binds (vec (mapcat (fn [f] [f `(get ~inst ~(keyword (name f)))]) fields))
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mbody (map (fn [bf] (rewrite-set inst bf)) (drop 2 spec))]
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(list argv (list* 'let binds mbody))))
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groups (group-by-head body)
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;; merge clauses by method NAME across ALL protocols into one multi-arity
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;; fn, so a name appearing in two interfaces with different arities
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;; (data.priority-map's seq is in Seqable [this] AND Sorted [this asc])
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;; dispatches by arg count instead of one registration shadowing the other.
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;; (Within one protocol, distinct arities like Indexed's nth merge the same
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;; way.) Each (protocol, name) registers the merged fn, so dispatch by name
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;; and satisfies? by protocol both hold.
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by-name (reduce (fn [m spec]
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(let [nm (name (first spec))]
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(assoc m nm (conj (get m nm []) (mk-clause spec)))))
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{} (mapcat rest groups))]
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`(do
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(def ~tname (make-deftype-ctor (quote ~tname) [~@field-kws] [~@field-tags] [~@field-muts]))
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(def ~arrow ~tname)
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~@(mapcat (fn [g]
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(let [proto (first g)
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names (distinct (map (fn [spec] (name (first spec))) (rest g)))]
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(cons `(register-inline-protocol! ~(name tname) ~(name proto))
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(map (fn [nm]
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`(register-inline-method ~(name tname) ~(name proto) ~nm
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(fn ~@(get by-name nm))))
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names))))
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groups)
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~tname)))
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;; The protocol value is built by make-protocol (a fn call) rather than an embedded
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;; tagged map literal: the interpreter would otherwise self-evaluate such a struct
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;; instead of evaluating its fields. methods is a {kw {:name str}} map (only :name
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;; is consulted). Each method is a thin dispatch fn over protocol-dispatch.
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(defmacro defprotocol [pname & sigs]
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;; Clojure's defprotocol takes an optional docstring and leading keyword
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;; options (:extend-via-metadata true, honeysql uses it) before the method
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;; signatures — drop them (metadata extension is a JVM dispatch detail).
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(let [sigs (loop [s sigs]
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(cond
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(string? (first s)) (recur (rest s))
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(keyword? (first s)) (recur (rest (rest s)))
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:else s))
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methods (reduce (fn [m sig]
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(assoc m (keyword (name (first sig))) {:name (name (first sig))}))
|
|
{} sigs)]
|
|
`(do
|
|
(def ~pname (make-protocol ~(name pname) ~methods))
|
|
;; register method var-keys for devirtualization; the inference
|
|
;; reads this (via infer-unit!) to resolve a protocol call on a known record
|
|
(register-protocol-methods! ~(name pname) [~@(map (fn [s] (name (first s))) sigs)])
|
|
~@(map (fn [sig]
|
|
`(def ~(first sig)
|
|
;; protocol-dispatch is a fn (clojure.core); pass the protocol /
|
|
;; method NAMES as strings (not the symbols) so it compiles as a
|
|
;; plain invoke rather than evaluating the symbols as vars.
|
|
(fn* [this# & rest#]
|
|
(protocol-dispatch ~(name pname) ~(name (first sig)) this# rest#))))
|
|
sigs))))
|
|
|
|
;; Member threading: (.. x f g) => (. (. x f) g); a parenthesized member
|
|
;; carries args. Canonical Clojure shape, single-arity defmacro.
|
|
(defmacro .. [x form & more]
|
|
(let [step (if (seq? form)
|
|
`(. ~x ~(first form) ~@(rest form))
|
|
`(. ~x ~form))]
|
|
(if (seq more)
|
|
`(.. ~step ~@more)
|
|
step)))
|
|
|
|
;; True when atype's methods were registered for this protocol (via extend /
|
|
;; extend-type). Tags are canonical host names or ns-qualified record names, so a
|
|
;; name matches its tag when either is a dotted suffix of the other — a bare
|
|
;; record name matches its "ns.Name" tag, and a query for a qualified host class
|
|
;; (java.util.Map) matches the canonical short tag (Map) extend registered it as.
|
|
(defn extends? [protocol atype]
|
|
(let [want (if (nil? atype) "nil" (name atype))
|
|
suffix? (fn [long short]
|
|
(let [d (str "." short)]
|
|
(and (> (count long) (count d))
|
|
(= (subs long (- (count long) (count d))) d))))]
|
|
(boolean (some (fn [t]
|
|
(let [tn (name t)]
|
|
(or (= tn want) (suffix? tn want) (suffix? want tn))))
|
|
(extenders protocol)))))
|
|
|
|
;; extend, the FUNCTION (extend-type's runtime sibling): protocol + method-map
|
|
;; pairs, methods registered under the type's (canonicalized) name — so
|
|
;; (extend 'String P {:m (fn [x] ...)}) dispatches exactly like extend-type.
|
|
(defn extend [atype & proto+mmaps]
|
|
;; nil extends on nil values; its host tag is the string "nil" (as extend-type).
|
|
(let [tname (if (nil? atype) "nil" (name atype))]
|
|
(loop [s (seq proto+mmaps)]
|
|
(when s
|
|
(let [proto (first s)
|
|
mmap (second s)
|
|
pname (name (get proto :name))]
|
|
(doseq [[k f] mmap]
|
|
(register-method tname pname (name k) f)))
|
|
(recur (nnext s))))))
|
|
|
|
(defmacro extend-type [tsym & body]
|
|
;; register-method is a fn (clojure.core); pass type/protocol/method NAMES as
|
|
;; strings (not the symbols) so the call compiles as a plain invoke. A nil
|
|
;; type extends on nil values (the host tag is the string "nil").
|
|
;; `body` is one or more protocols, each followed by its method specs:
|
|
;; (extend-type T P1 (m1 [_] ..) P2 (m2 [_] ..)) — a bare symbol switches the
|
|
;; current protocol (like reify), so multiple protocols extend in one form.
|
|
(let [tname (if (nil? tsym) "nil" (name tsym))]
|
|
(loop [items (seq body) proto nil forms []]
|
|
(if (empty? items)
|
|
`(do ~@forms)
|
|
(let [x (first items)]
|
|
(if (symbol? x)
|
|
(recur (rest items) (name x) forms)
|
|
(recur (rest items) proto
|
|
(conj forms
|
|
`(register-method ~tname ~proto ~(name (first x))
|
|
(fn ~(nth x 1) ~@(drop 2 x)))))))))))
|
|
|
|
(defmacro extend-protocol [psym & type-impls]
|
|
`(do ~@(map (fn [g] `(extend-type ~(first g) ~psym ~@(rest g)))
|
|
(group-by-head type-impls))))
|
|
|
|
;; extend is a real FUNCTION — defined above extend-type.
|
|
;; JVM proxies are unsupported.
|
|
(defmacro proxy [& args] nil)
|
|
;; definterface is JVM-only; bind the name to a marker and return the name (not a
|
|
;; var), matching the JVM where definterface yields the interface Class.
|
|
(defmacro definterface [name-sym & body]
|
|
`(do (def ~name-sym {}) (quote ~name-sym)))
|
|
|
|
;; make-reified is a fn (clojure.core); the method map {kw (fn* ...)} is an
|
|
;; ordinary map literal that evaluates to {keyword fn}, and the protocol NAME is
|
|
;; passed as a string (not the symbol) so the call compiles as a plain invoke.
|
|
(defmacro reify [& forms]
|
|
;; a reify can implement SEVERAL protocols; collect them all (each bare symbol
|
|
;; switches the current protocol, like extend-type) and pass every protocol name
|
|
;; to make-reified so (instance? Proto r)/satisfies? recognise all of them.
|
|
;; Several bodies for the same method name are distinct arities (clojure.spec
|
|
;; reifies (specize* [s]) and (specize* [s _])): group them into one multi-arity
|
|
;; fn so dispatch picks the clause by arg count.
|
|
(loop [items (seq forms) protos [] methods {} order []]
|
|
(if (empty? items)
|
|
`(make-reified
|
|
~(reduce (fn [m k] (assoc m k `(fn ~@(get methods k)))) {} order)
|
|
~@(vec (map name protos)))
|
|
(let [x (first items)]
|
|
(if (symbol? x)
|
|
(recur (rest items) (conj protos x) methods order)
|
|
(let [k (keyword (name (first x)))
|
|
clause `(~(nth x 1) ~@(drop 2 x))]
|
|
(recur (rest items) protos
|
|
(assoc methods k (conj (get methods k []) clause))
|
|
(if (contains? methods k) order (conj order k)))))))))
|
|
|
|
(defmacro defrecord [name-sym fields & body]
|
|
(let [tn (name name-sym)
|
|
arrow (symbol (str "->" tn))
|
|
mapf (symbol (str "map->" tn))
|
|
m (fresh-sym)
|
|
;; each method body sees the record fields, bound from the instance (the
|
|
;; method's first param), matching Clojure's defrecord method scope. vec the
|
|
;; spliced binding seq so ~@ splices its elements, not the lazy-seq itself.
|
|
;; inline impls register for dispatch but are NOT extenders of the
|
|
;; protocol (the JVM compiles them into the class) — register-inline-method,
|
|
;; not extend-type.
|
|
;; one clause from a spec; `this` is hinted with the record type so the
|
|
;; inference reads its fields bare-index. Clause as DATA (see deftype).
|
|
mk-clause (fn [spec]
|
|
(let [argv (nth spec 1)
|
|
inst (first argv)
|
|
hinted (assoc argv 0 (vary-meta inst assoc :tag (name name-sym)))
|
|
binds (vec (mapcat (fn [f] [f `(get ~inst ~(keyword (name f)))]) fields))]
|
|
(list hinted (list* 'let binds (drop 2 spec)))))
|
|
groups (group-by-head body)
|
|
;; merge clauses by name across protocols into one multi-arity fn (see
|
|
;; deftype's by-name).
|
|
by-name (reduce (fn [m spec]
|
|
(let [nm (name (first spec))]
|
|
(assoc m nm (conj (get m nm []) (mk-clause spec)))))
|
|
{} (mapcat rest groups))]
|
|
`(do
|
|
;; deftype already defines ->name (= the ctor); no (name. …) interop needed,
|
|
;; so defrecord compiles too. map->name builds via that ctor.
|
|
(deftype ~name-sym ~fields)
|
|
(def ~mapf (fn* [~m] (~arrow ~@(map (fn [f] `(get ~m ~(keyword (name f)))) fields))))
|
|
~@(mapcat (fn [g]
|
|
(let [proto (first g)
|
|
names (distinct (map (fn [spec] (name (first spec))) (rest g)))]
|
|
(cons `(register-inline-protocol! ~(name name-sym) ~(name proto))
|
|
(map (fn [nm]
|
|
`(register-inline-method ~(name name-sym) ~(name proto) ~nm
|
|
(fn ~@(get by-name nm))))
|
|
names))))
|
|
groups))))
|
|
|
|
;; --- laziness --------------------------------------------------------------
|
|
;; lazy-seq / lazy-cat moved to the 00-syntax tier: the seq/coll tiers (10-seq,
|
|
;; 20-coll) use lazy-seq, and in compile mode a tier's forms are compiled as it
|
|
;; loads — so the macro must be registered BEFORE those tiers, else (lazy-seq …)
|
|
;; compiles as a call to the macro-as-function and leaks its expansion at runtime.
|
|
;; They only need seed fns (make-lazy-seq/coll->cells/concat).
|
|
|
|
;; memfn: a fn wrapping a method call, (memfn toUpperCase) => #(.toUpperCase %).
|
|
;; The method symbol is rewritten to jolt's .method call sugar; extra arg names
|
|
;; become fn params, as in Clojure.
|
|
(defmacro memfn [method-name & args]
|
|
`(fn [target# ~@args]
|
|
(~(symbol (str "." (name method-name))) target# ~@args)))
|