3680ee6d58
defmulti/defmethod become macros (30-macros) over ctx-capturing clojure.core fns (defmulti-setup/defmethod-setup, interned by install-stateful-fns!): - defmulti: (defmulti name dispatch & opts) -> (defmulti-setup 'name dispatch ~@opts). name quoted; dispatch + opts (:default/:hierarchy) evaluated. defmulti-setup builds the dispatch closure over the method table and interns the var (same hierarchy/default/cache behavior). - defmethod: (defmethod mm dval & fn-tail) -> (defmethod-setup 'mm dval (fn ~@fn-tail)). The method impl is now a COMPILED (fn …) (was an interpreted fn* eval). Auto-creates the multimethod if missing. - removed their special-symbol? entries + eval-list arms, and dropped them from host_iface special-names + loader stateful-head?. Both compile + interpret as plain invokes; dispatch incl. :default and derive/hierarchy works in both modes. Tests: evaluator-test (defmulti case) + namespace-test now use init (these forms are overlay macros now, so a bare make-ctx lacks them). Gate green: conformance 269x3, fallback-zero 38/4, bootstrap-fixpoint stage1==2==3, self-host, staged-bootstrap, sci-bootstrap, clojure-test-suite >=4034/67, features 78/78, all unit + spec (multimethods 16/16).
242 lines
11 KiB
Clojure
242 lines
11 KiB
Clojure
;; clojure.core — macro tier. Macros expressed in Clojure (defmacro + syntax-quote)
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;; rather than as hand-built Janet form-transformers. Loaded after the fn tiers,
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;; so a macro here may use any already-frozen core 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 in Janet for now. Everything here is user-facing.
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;;
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;; Migration: remove the Janet 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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;; 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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(defmacro defmulti [name dispatch & opts]
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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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;; 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: (gensym) here resolves to Janet's
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;; builtin (a Janet symbol 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). Matches
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;; the prior Janet behavior; the nil/false-head distinction waits on Phase 5
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;; laziness.
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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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(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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(defmacro letfn [fnspecs & body]
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(let [binds (reduce (fn [acc spec] (conj (conj acc (first spec)) `(fn* ~@(rest spec))))
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[] fnspecs)]
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`(let* [~@binds] ~@body)))
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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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(reduce (fn [acc x]
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(if (symbol? 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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;; 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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(let [methods (reduce (fn [m sig]
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(assoc m (keyword (name (first sig))) {:name (name (first sig))}))
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{} sigs)]
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`(do
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(def ~pname (make-protocol ~(name pname) ~methods))
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~@(map (fn [sig]
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`(def ~(first sig)
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;; protocol-dispatch is a fn (clojure.core); pass the protocol /
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;; method NAMES as strings (not the symbols) so it compiles as a
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;; plain invoke rather than evaluating the symbols as vars.
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(fn* [this# & rest#]
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(protocol-dispatch ~(name pname) ~(name (first sig)) this# rest#))))
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sigs))))
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(defmacro extend-type [tsym psym & impls]
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;; register-method is a fn (clojure.core); pass type/protocol/method NAMES as
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;; strings (not the symbols) so the call compiles as a plain invoke.
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`(do ~@(map (fn [spec]
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`(register-method ~(name tsym) ~(name psym) ~(name (first spec))
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(fn* ~(nth spec 1) ~@(drop 2 spec))))
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impls)))
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(defmacro extend-protocol [psym & type-impls]
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`(do ~@(map (fn [g] `(extend-type ~(first g) ~psym ~@(rest g)))
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(group-by-head type-impls))))
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;; extend (the fn form) is not supported — stub to nil, as before.
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(defmacro extend [& args] nil)
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;; JVM proxies are unsupported.
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(defmacro proxy [& args] nil)
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;; definterface is JVM-only; bind the name to an empty marker.
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(defmacro definterface [name-sym & body] `(def ~name-sym {}))
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;; make-reified is a fn (clojure.core); the method map {kw (fn* ...)} is an
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;; ordinary map literal that evaluates to {keyword fn}, and the protocol NAME is
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;; passed as a string (not the symbol) so the call compiles as a plain invoke.
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(defmacro reify [& forms]
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(loop [items (seq forms) proto nil methods {}]
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(if (empty? items)
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`(make-reified ~(name proto) ~methods)
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(let [x (first items)]
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(if (symbol? x)
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(recur (rest items) (if proto proto x) methods)
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(recur (rest items) proto
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(assoc methods (keyword (name (first x)))
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`(fn* ~(nth x 1) ~@(drop 2 x)))))))))
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(defmacro defrecord [name-sym fields & body]
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(let [tn (name name-sym)
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dot (symbol (str tn "."))
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arrow (symbol (str "->" tn))
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mapf (symbol (str "map->" tn))
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m (fresh-sym)
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;; each method body sees the record fields, bound from the instance (the
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;; method's first param), matching Clojure's defrecord method scope. vec the
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;; spliced binding seq so ~@ splices its elements, not the lazy-seq itself.
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impl (fn [proto specs]
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`(extend-type ~name-sym ~proto
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~@(map (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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`(~(first spec) ~argv (let [~@binds] ~@(drop 2 spec)))))
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specs)))]
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`(do
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(deftype ~name-sym ~fields)
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(def ~arrow (fn* ~fields (~dot ~@fields)))
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(def ~mapf (fn* [~m] (~arrow ~@(map (fn [f] `(get ~m ~(keyword (name f)))) fields))))
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~@(map (fn [g] (impl (first g) (rest g))) (group-by-head body)))))
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;; --- laziness --------------------------------------------------------------
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;; lazy-seq / lazy-cat moved to the 00-syntax tier: the seq/coll tiers (10-seq,
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;; 20-coll) use lazy-seq, and in compile mode a tier's forms are compiled as it
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;; loads — so the macro must be registered BEFORE those tiers, else (lazy-seq …)
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;; compiles as a call to the macro-as-function and leaks its expansion at runtime
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;; (jolt-r81). They only need seed fns (make-lazy-seq/coll->cells/concat).
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