(module contract-arrow mzscheme (require (lib "etc.ss") (lib "list.ss") "contract-guts.ss" "class-internal.ss") (require-for-syntax "contract-helpers.scm" (lib "list.ss") (lib "stx.ss" "syntax") (lib "name.ss" "syntax")) (provide any -> ->d ->* ->d* ->r ->pp ->pp-rest case-> opt-> opt->* object-contract mixin-contract make-mixin-contract is-a?/c subclass?/c implementation?/c) (define-syntax (any stx) (raise-syntax-error 'any "Use any out of an arrow contract" stx)) ;; FIXME: need to pass in the name of the contract combinator. (define (build--> doms doms-rest rngs rng-any? func) (let ([doms/c (map (λ (dom) (coerce-contract -> dom)) doms)] [rngs/c (map (λ (rng) (coerce-contract -> rng)) rngs)] [doms-rest/c (and doms-rest (coerce-contract -> doms-rest))]) (make--> rng-any? doms/c doms-rest/c rngs/c func))) (define-struct/prop -> (rng-any? doms dom-rest rngs func) ((pos-proj-prop (λ (ctc) (let* ([doms/c (map (λ (x) ((neg-proj-get x) x)) (if (->-dom-rest ctc) (append (->-doms ctc) (list (->-dom-rest ctc))) (->-doms ctc)))] [rngs/c (map (λ (x) ((pos-proj-get x) x)) (->-rngs ctc))] [func (->-func ctc)] [dom-length (length (->-doms ctc))] [check-proc (if (->-dom-rest ctc) check-procedure/more check-procedure)]) (lambda (blame src-info orig-str) (let ([partial-doms (map (λ (dom) (dom blame src-info orig-str)) doms/c)] [partial-ranges (map (λ (rng) (rng blame src-info orig-str)) rngs/c)]) (apply func (λ (val) (check-proc val dom-length src-info blame orig-str)) (append partial-doms partial-ranges))))))) (neg-proj-prop (λ (ctc) (let* ([doms/c (map (λ (x) ((pos-proj-get x) x)) (if (->-dom-rest ctc) (append (->-doms ctc) (list (->-dom-rest ctc))) (->-doms ctc)))] [rngs/c (map (λ (x) ((neg-proj-get x) x)) (->-rngs ctc))] [func (->-func ctc)]) (lambda (blame src-info orig-str) (let ([partial-doms (map (λ (dom) (dom blame src-info orig-str)) doms/c)] [partial-ranges (map (λ (rng) (rng blame src-info orig-str)) rngs/c)]) (apply func void (append partial-doms partial-ranges))))))) (name-prop (λ (ctc) (single-arrow-name-maker (->-doms ctc) (->-dom-rest ctc) (->-rng-any? ctc) (->-rngs ctc)))) (stronger-prop (λ (this that) (and (->? that) (= (length (->-doms that)) (length (->-doms this))) (andmap contract-stronger? (->-doms that) (->-doms this)) (= (length (->-rngs that)) (length (->-rngs this))) (andmap contract-stronger? (->-rngs this) (->-rngs that))))))) (define (single-arrow-name-maker doms/c doms-rest rng-any? rngs) (cond [doms-rest (build-compound-type-name '->* (apply build-compound-type-name doms/c) doms-rest (cond [rng-any? 'any] [else (apply build-compound-type-name rngs)]))] [else (let ([rng-name (cond [rng-any? 'any] [(null? rngs) '(values)] [(null? (cdr rngs)) (car rngs)] [else (apply build-compound-type-name 'values rngs)])]) (apply build-compound-type-name '-> (append doms/c (list rng-name))))])) (define-syntax-set (-> ->*) (define (->/proc stx) (let-values ([(stx _1 _2) (->/proc/main stx)]) stx)) ;; ->/proc/main : syntax -> (values syntax[contract-record] syntax[args/lambda-body] syntax[names]) (define (->/proc/main stx) (let-values ([(dom-names rng-names dom-ctcs rng-ctcs inner-args/body use-any?) (->-helper stx)]) (with-syntax ([(args body) inner-args/body]) (with-syntax ([(dom-names ...) dom-names] [(rng-names ...) rng-names] [(dom-ctcs ...) dom-ctcs] [(rng-ctcs ...) rng-ctcs] [inner-lambda (add-name-prop (syntax-local-infer-name stx) (syntax (lambda args body)))] [use-any? use-any?]) (with-syntax ([outer-lambda (syntax (lambda (chk dom-names ... rng-names ...) (lambda (val) (chk val) inner-lambda)))]) (values (syntax (build--> (list dom-ctcs ...) #f (list rng-ctcs ...) use-any? outer-lambda)) inner-args/body (syntax (dom-names ... rng-names ...)))))))) (define (->-helper stx) (syntax-case* stx (-> any values) module-or-top-identifier=? [(-> doms ... any) (with-syntax ([(args ...) (generate-temporaries (syntax (doms ...)))] [(dom-ctc ...) (generate-temporaries (syntax (doms ...)))] [(ignored) (generate-temporaries (syntax (rng)))]) (values (syntax (dom-ctc ...)) (syntax (ignored)) (syntax (doms ...)) (syntax (any/c)) (syntax ((args ...) (val (dom-ctc args) ...))) #t))] [(-> doms ... (values rngs ...)) (with-syntax ([(args ...) (generate-temporaries (syntax (doms ...)))] [(dom-ctc ...) (generate-temporaries (syntax (doms ...)))] [(rng-x ...) (generate-temporaries (syntax (rngs ...)))] [(rng-ctc ...) (generate-temporaries (syntax (rngs ...)))]) (values (syntax (dom-ctc ...)) (syntax (rng-ctc ...)) (syntax (doms ...)) (syntax (rngs ...)) (syntax ((args ...) (let-values ([(rng-x ...) (val (dom-ctc args) ...)]) (values (rng-ctc rng-x) ...)))) #f))] [(_ doms ... rng) (with-syntax ([(args ...) (generate-temporaries (syntax (doms ...)))] [(dom-ctc ...) (generate-temporaries (syntax (doms ...)))] [(rng-ctc) (generate-temporaries (syntax (rng)))]) (values (syntax (dom-ctc ...)) (syntax (rng-ctc)) (syntax (doms ...)) (syntax (rng)) (syntax ((args ...) (rng-ctc (val (dom-ctc args) ...)))) #f))])) (define (->*/proc stx) (let-values ([(stx _1 _2) (->*/proc/main stx)]) stx)) ;; ->/proc/main : syntax -> (values syntax[contract-record] syntax[args/lambda-body] syntax[names]) (define (->*/proc/main stx) (syntax-case* stx (->* any) module-or-top-identifier=? [(->* (doms ...) any) (->/proc/main (syntax (-> doms ... any)))] [(->* (doms ...) (rngs ...)) (->/proc/main (syntax (-> doms ... (values rngs ...))))] [(->* (doms ...) rst (rngs ...)) (with-syntax ([(dom-x ...) (generate-temporaries (syntax (doms ...)))] [(args ...) (generate-temporaries (syntax (doms ...)))] [(rst-x) (generate-temporaries (syntax (rst)))] [(rest-arg) (generate-temporaries (syntax (rst)))] [(rng-x ...) (generate-temporaries (syntax (rngs ...)))] [(rng-args ...) (generate-temporaries (syntax (rngs ...)))]) (let ([inner-args/body (syntax ((args ... . rest-arg) (let-values ([(rng-args ...) (apply val (dom-x args) ... (rst-x rest-arg))]) (values (rng-x rng-args) ...))))]) (with-syntax ([inner-lambda (with-syntax ([(args body) inner-args/body]) (add-name-prop (syntax-local-infer-name stx) (syntax (lambda args body))))]) (with-syntax ([outer-lambda (syntax (lambda (chk dom-x ... rst-x rng-x ...) (lambda (val) (chk val) inner-lambda)))]) (values (syntax (build--> (list doms ...) rst (list rngs ...) #f outer-lambda)) inner-args/body (syntax (dom-x ... rst-x rng-x ...)))))))] [(->* (doms ...) rst any) (with-syntax ([(dom-x ...) (generate-temporaries (syntax (doms ...)))] [(args ...) (generate-temporaries (syntax (doms ...)))] [(rst-x) (generate-temporaries (syntax (rst)))] [(rest-arg) (generate-temporaries (syntax (rst)))]) (let ([inner-args/body (syntax ((args ... . rest-arg) (apply val (dom-x args) ... (rst-x rest-arg))))]) (with-syntax ([inner-lambda (with-syntax ([(args body) inner-args/body]) (add-name-prop (syntax-local-infer-name stx) (syntax (lambda args body))))]) (with-syntax ([outer-lambda (syntax (lambda (chk dom-x ... rst-x ignored) (lambda (val) (chk val) inner-lambda)))]) (values (syntax (build--> (list doms ...) rst (list any/c) #t outer-lambda)) inner-args/body (syntax (dom-x ... rst-x)))))))]))) (define-syntax-set (->/real ->*/real ->d ->d* ->r ->pp ->pp-rest case-> object-contract opt-> opt->*) (define (->/real/proc stx) (make-/proc #f ->/h stx)) (define (->*/real/proc stx) (make-/proc #f ->*/h stx)) (define (->d/proc stx) (make-/proc #f ->d/h stx)) (define (->d*/proc stx) (make-/proc #f ->d*/h stx)) (define (->r/proc stx) (make-/proc #f ->r/h stx)) (define (->pp/proc stx) (make-/proc #f ->pp/h stx)) (define (->pp-rest/proc stx) (make-/proc #f ->pp-rest/h stx)) (define (obj->/proc stx) (make-/proc #t ->/h stx)) (define (obj->*/proc stx) (make-/proc #t ->*/h stx)) (define (obj->d/proc stx) (make-/proc #t ->d/h stx)) (define (obj->d*/proc stx) (make-/proc #t ->d*/h stx)) (define (obj->r/proc stx) (make-/proc #t ->r/h stx)) (define (obj->pp/proc stx) (make-/proc #t ->pp/h stx)) (define (obj->pp-rest/proc stx) (make-/proc #t ->pp-rest/h stx)) (define (case->/proc stx) (make-case->/proc #f stx stx)) (define (obj-case->/proc stx) (make-case->/proc #t stx stx)) (define (obj-opt->/proc stx) (make-opt->/proc #t stx)) (define (obj-opt->*/proc stx) (make-opt->*/proc #t stx stx)) (define (opt->/proc stx) (make-opt->/proc #f stx)) (define (opt->*/proc stx) (make-opt->*/proc #f stx stx)) ;; make-/proc : boolean ;; (syntax -> (values (syntax -> syntax) (syntax -> syntax) (syntax -> syntax) (syntax -> syntax))) ;; syntax ;; -> (syntax -> syntax) (define (make-/proc method-proc? /h stx) (let-values ([(arguments-check build-pos-proj build-neg-proj check-val pos-wrapper neg-wrapper) (/h method-proc? stx)]) (let ([outer-args (syntax (val blame src-info orig-str name-id))]) (with-syntax ([inner-check (check-val outer-args)] [(val blame src-info orig-str name-id) outer-args] [(pos-val-args pos-body) (pos-wrapper outer-args)] [(neg-val-args neg-body) (neg-wrapper outer-args)]) (with-syntax ([inner-pos-lambda (set-inferred-name-from stx (syntax/loc stx (lambda pos-val-args pos-body)))] [inner-neg-lambda (set-inferred-name-from stx (syntax/loc stx (lambda neg-val-args neg-body)))]) (let ([inner-pos-lambda-w/err-check (syntax (lambda (val) inner-check inner-pos-lambda))] [inner-neg-lambda (syntax (lambda (val) inner-neg-lambda))]) (with-syntax ([pos-proj-code (build-pos-proj outer-args inner-pos-lambda-w/err-check)] [neg-proj-code (build-neg-proj outer-args inner-neg-lambda)]) (arguments-check outer-args (syntax/loc stx (make-pair-proj-contract name-id (lambda (blame src-info orig-str) pos-proj-code) (lambda (blame src-info orig-str) neg-proj-code))))))))))) (define (make-case->/proc method-proc? stx inferred-name-stx) (syntax-case stx () ;; if there is only a single case, just skip it. [(_ case) (syntax case)] [(_ cases ...) (let-values ([(arguments-check build-pos-projs build-neg-projs check-val pos-wrapper neg-wrapper) (case->/h method-proc? stx (syntax->list (syntax (cases ...))))]) (let ([outer-args (syntax (val blame src-info orig-str name-id))]) (with-syntax ([(inner-check ...) (check-val outer-args)] [(val blame src-info orig-str name-id) outer-args] [(pos-body ...) (pos-wrapper outer-args)] [(neg-body ...) (neg-wrapper outer-args)]) (with-syntax ([inner-pos-lambda (set-inferred-name-from inferred-name-stx (syntax/loc stx (case-lambda pos-body ...)))] [inner-neg-lambda (set-inferred-name-from inferred-name-stx (syntax/loc stx (case-lambda neg-body ...)))]) (let ([inner-pos-lambda-w/err-check (syntax (lambda (val) inner-check ... inner-pos-lambda))] [inner-neg-lambda (syntax (lambda (val) inner-neg-lambda))]) (with-syntax ([pos-proj-code (build-pos-projs outer-args inner-pos-lambda-w/err-check)] [neg-proj-code (build-neg-projs outer-args inner-neg-lambda)]) (arguments-check outer-args (syntax/loc stx (make-pair-proj-contract (apply build-compound-type-name 'case-> name-id) (lambda (blame src-info orig-str) pos-proj-code) (lambda (blame src-info orig-str) neg-proj-code))))))))))])) (define (make-opt->/proc method-proc? stx) (syntax-case stx (any) [(_ (reqs ...) (opts ...) any) (make-opt->*/proc method-proc? (syntax (opt->* (reqs ...) (opts ...) any)) stx)] [(_ (reqs ...) (opts ...) res) (make-opt->*/proc method-proc? (syntax (opt->* (reqs ...) (opts ...) (res))) stx)])) (define (make-opt->*/proc method-proc? stx inferred-name-stx) (syntax-case stx (any) [(_ (reqs ...) (opts ...) any) (let* ([req-vs (generate-temporaries (syntax->list (syntax (reqs ...))))] [opt-vs (generate-temporaries (syntax->list (syntax (opts ...))))] [cses (reverse (let loop ([opt-vs (reverse opt-vs)]) (cond [(null? opt-vs) (list req-vs)] [else (cons (append req-vs (reverse opt-vs)) (loop (cdr opt-vs)))])))]) (with-syntax ([(req-vs ...) req-vs] [(opt-vs ...) opt-vs] [((case-doms ...) ...) cses]) (with-syntax ([expanded-case-> (make-case->/proc method-proc? (syntax (case-> (-> case-doms ... any) ...)) inferred-name-stx)]) (syntax/loc stx (let ([req-vs reqs] ... [opt-vs opts] ...) expanded-case->)))))] [(_ (reqs ...) (opts ...) (ress ...)) (let* ([res-vs (generate-temporaries (syntax->list (syntax (ress ...))))] [req-vs (generate-temporaries (syntax->list (syntax (reqs ...))))] [opt-vs (generate-temporaries (syntax->list (syntax (opts ...))))] [cses (reverse (let loop ([opt-vs (reverse opt-vs)]) (cond [(null? opt-vs) (list req-vs)] [else (cons (append req-vs (reverse opt-vs)) (loop (cdr opt-vs)))])))]) (with-syntax ([(res-vs ...) res-vs] [(req-vs ...) req-vs] [(opt-vs ...) opt-vs] [((case-doms ...) ...) cses]) (with-syntax ([(single-case-result ...) (let* ([ress-lst (syntax->list (syntax (ress ...)))] [only-one? (and (pair? ress-lst) (null? (cdr ress-lst)))]) (map (if only-one? (lambda (x) (car (syntax->list (syntax (res-vs ...))))) (lambda (x) (syntax (values res-vs ...)))) cses))]) (with-syntax ([expanded-case-> (make-case->/proc method-proc? (syntax (case-> (-> case-doms ... single-case-result) ...)) inferred-name-stx)]) (set-inferred-name-from stx (syntax/loc stx (let ([res-vs ress] ... [req-vs reqs] ... [opt-vs opts] ...) expanded-case->)))))))])) ;; exactract-argument-lists : syntax -> (listof syntax) (define (extract-argument-lists stx) (map (lambda (x) (syntax-case x () [(arg-list body) (syntax arg-list)])) (syntax->list stx))) ;; ensure-cases-disjoint : syntax syntax[list] -> void (define (ensure-cases-disjoint stx cases) (let ([individual-cases null] [dot-min #f]) (for-each (lambda (case) (let ([this-case (get-case case)]) (cond [(number? this-case) (cond [(member this-case individual-cases) (raise-syntax-error 'case-> (format "found multiple cases with ~a arguments" this-case) stx)] [(and dot-min (dot-min . <= . this-case)) (raise-syntax-error 'case-> (format "found overlapping cases (~a+ followed by ~a)" dot-min this-case) stx)] [else (set! individual-cases (cons this-case individual-cases))])] [(pair? this-case) (let ([new-dot-min (car this-case)]) (cond [dot-min (if (dot-min . <= . new-dot-min) (raise-syntax-error 'case-> (format "found overlapping cases (~a+ followed by ~a+)" dot-min new-dot-min) stx) (set! dot-min new-dot-min))] [else (set! dot-min new-dot-min)]))]))) cases))) ;; get-case : syntax -> (union number (cons number 'more)) (define (get-case stx) (let ([ilist (syntax-object->datum stx)]) (if (list? ilist) (length ilist) (cons (let loop ([i ilist]) (cond [(pair? i) (+ 1 (loop (cdr i)))] [else 0])) 'more)))) ;; case->/h : boolean ;; syntax ;; (listof syntax) ;; -> (values (syntax -> syntax) ;; (syntax -> syntax) ;; (syntax -> syntax) ;; (syntax syntax -> syntax) ;; (syntax -> syntax) ;; (syntax -> syntax)) ;; like the other /h functions, but composes the wrapper functions ;; together and combines the cases of the case-lambda into a single list. (define (case->/h method-proc? orig-stx cases) (let loop ([cases cases] [name-ids '()]) (cond [(null? cases) (values (lambda (outer-args body) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [body body] [(name-ids ...) (reverse name-ids)]) (syntax (let ([name-id (list name-ids ...)]) body)))) (lambda (x y) y) (lambda (x y) y) (lambda (args) (syntax ())) (lambda (args) (syntax ())) (lambda (args) (syntax ())))] [else (let ([/h (select/h (car cases) 'case-> orig-stx)] [new-id (car (generate-temporaries (syntax (case->name-id))))]) (let-values ([(arguments-checks build-pos-projs build-neg-projs check-vals pos-wrappers neg-wrappers) (loop (cdr cases) (cons new-id name-ids))] [(arguments-check build-pos-proj build-neg-proj check-val pos-wrapper neg-wrapper) (/h method-proc? (car cases))]) (values (lambda (outer-args x) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [new-id new-id]) (arguments-check (syntax (val blame src-info orig-str new-id)) (arguments-checks outer-args x)))) (lambda (args inner) (build-pos-projs args (build-pos-proj args inner))) (lambda (args inner) (build-neg-projs args (build-neg-proj args inner))) (lambda (args) (with-syntax ([checks (check-vals args)] [check (check-val args)]) (syntax (check . checks)))) (lambda (args) (with-syntax ([case (pos-wrapper args)] [cases (pos-wrappers args)]) (syntax (case . cases)))) (lambda (args) (with-syntax ([case (neg-wrapper args)] [cases (neg-wrappers args)]) (syntax (case . cases)))))))]))) (define (object-contract/proc stx) ;; name : syntax ;; ctc-stx : syntax[evals to a contract] ;; mtd-arg-stx : syntax[list of arg-specs] (ie, for use in a case-lambda) (define-struct mtd (name ctc-stx mtd-arg-stx)) ;; name : syntax ;; ctc-stx : syntax[evals to a contract] (define-struct fld (name ctc-stx)) ;; expand-field/mtd-spec : stx -> (union mtd fld) (define (expand-field/mtd-spec f/m-stx) (syntax-case f/m-stx (field) [(field field-name ctc) (identifier? (syntax field-name)) (make-fld (syntax field-name) (syntax ctc))] [(field field-name ctc) (raise-syntax-error 'object-contract "expected name of field" stx (syntax field-name))] [(mtd-name ctc) (identifier? (syntax mtd-name)) (let-values ([(ctc-stx proc-stx) (expand-mtd-contract (syntax ctc))]) (make-mtd (syntax mtd-name) ctc-stx proc-stx))] [(mtd-name ctc) (raise-syntax-error 'object-contract "expected name of method" stx (syntax mtd-name))] [_ (raise-syntax-error 'object-contract "expected field or method clause" stx f/m-stx)])) ;; expand-mtd-contract : syntax -> (values syntax[expanded ctc] syntax[mtd-arg]) (define (expand-mtd-contract mtd-stx) (syntax-case mtd-stx (case-> opt-> opt->*) [(case-> cases ...) (let loop ([cases (syntax->list (syntax (cases ...)))] [ctc-stxs null] [args-stxs null]) (cond [(null? cases) (values (with-syntax ([(x ...) (reverse ctc-stxs)]) (obj-case->/proc (syntax (case-> x ...)))) (with-syntax ([(x ...) (apply append (map syntax->list (reverse args-stxs)))]) (syntax (x ...))))] [else (let-values ([(trans ctc-stx mtd-args) (expand-mtd-arrow (car cases))]) (loop (cdr cases) (cons ctc-stx ctc-stxs) (cons mtd-args args-stxs)))]))] [(opt->* (req-contracts ...) (opt-contracts ...) (res-contracts ...)) (values (obj-opt->*/proc (syntax (opt->* (any/c req-contracts ...) (opt-contracts ...) (res-contracts ...)))) (generate-opt->vars (syntax (req-contracts ...)) (syntax (opt-contracts ...))))] [(opt->* (req-contracts ...) (opt-contracts ...) any) (values (obj-opt->*/proc (syntax (opt->* (any/c req-contracts ...) (opt-contracts ...) any))) (generate-opt->vars (syntax (req-contracts ...)) (syntax (opt-contracts ...))))] [(opt-> (req-contracts ...) (opt-contracts ...) res-contract) (values (obj-opt->/proc (syntax (opt-> (any/c req-contracts ...) (opt-contracts ...) res-contract))) (generate-opt->vars (syntax (req-contracts ...)) (syntax (opt-contracts ...))))] [else (let-values ([(x y z) (expand-mtd-arrow mtd-stx)]) (values (x y) z))])) ;; generate-opt->vars : syntax[requried contracts] syntax[optional contracts] -> syntax[list of arg specs] (define (generate-opt->vars req-stx opt-stx) (with-syntax ([(req-vars ...) (generate-temporaries req-stx)] [(ths) (generate-temporaries (syntax (ths)))]) (let loop ([opt-vars (generate-temporaries opt-stx)]) (cond [(null? opt-vars) (list (syntax (ths req-vars ...)))] [else (with-syntax ([(opt-vars ...) opt-vars] [(rests ...) (loop (cdr opt-vars))]) (syntax ((ths req-vars ... opt-vars ...) rests ...)))])))) ;; expand-mtd-arrow : stx -> (values (syntax[ctc] -> syntax[expanded ctc]) syntax[ctc] syntax[mtd-arg]) (define (expand-mtd-arrow mtd-stx) (syntax-case mtd-stx (-> ->* ->d ->d* ->r ->pp ->pp-rest) [(->) (raise-syntax-error 'object-contract "-> must have arguments" stx mtd-stx)] [(-> args ...) ;; this case cheats a little bit -- ;; (args ...) contains the right number of arguments ;; to the method because it also contains one arg for the result! urgh. (with-syntax ([(arg-vars ...) (generate-temporaries (syntax (args ...)))]) (values obj->/proc (syntax (-> any/c args ...)) (syntax ((arg-vars ...)))))] [(->* (doms ...) (rngs ...)) (with-syntax ([(args-vars ...) (generate-temporaries (syntax (doms ...)))] [(this-var) (generate-temporaries (syntax (this-var)))]) (values obj->*/proc (syntax (->* (any/c doms ...) (rngs ...))) (syntax ((this-var args-vars ...)))))] [(->* (doms ...) rst (rngs ...)) (with-syntax ([(args-vars ...) (generate-temporaries (syntax (doms ...)))] [(rst-var) (generate-temporaries (syntax (rst)))] [(this-var) (generate-temporaries (syntax (this-var)))]) (values obj->*/proc (syntax (->* (any/c doms ...) rst (rngs ...))) (syntax ((this-var args-vars ... . rst-var)))))] [(->* x ...) (raise-syntax-error 'object-contract "malformed ->*" stx mtd-stx)] [(->d) (raise-syntax-error 'object-contract "->d must have arguments" stx mtd-stx)] [(->d doms ... rng-proc) (let ([doms-val (syntax->list (syntax (doms ...)))]) (values obj->d/proc (with-syntax ([(arg-vars ...) (generate-temporaries doms-val)] [arity-count (length doms-val)]) (syntax (->d any/c doms ... (let ([f rng-proc]) (check->* f arity-count) (lambda (_this-var arg-vars ...) (f arg-vars ...)))))) (with-syntax ([(args-vars ...) (generate-temporaries doms-val)]) (syntax ((this-var args-vars ...))))))] [(->d* (doms ...) rng-proc) (values obj->d*/proc (let ([doms-val (syntax->list (syntax (doms ...)))]) (with-syntax ([(arg-vars ...) (generate-temporaries doms-val)] [arity-count (length doms-val)]) (syntax (->d* (any/c doms ...) (let ([f rng-proc]) (check->* f arity-count) (lambda (_this-var arg-vars ...) (f arg-vars ...))))))) (with-syntax ([(args-vars ...) (generate-temporaries (syntax (doms ...)))] [(this-var) (generate-temporaries (syntax (this-var)))]) (syntax ((this-var args-vars ...)))))] [(->d* (doms ...) rst-ctc rng-proc) (let ([doms-val (syntax->list (syntax (doms ...)))]) (values obj->d*/proc (with-syntax ([(arg-vars ...) (generate-temporaries doms-val)] [(rest-var) (generate-temporaries (syntax (rst-ctc)))] [arity-count (length doms-val)]) (syntax (->d* (any/c doms ...) rst-ctc (let ([f rng-proc]) (check->*/more f arity-count) (lambda (_this-var arg-vars ... . rest-var) (apply f arg-vars ... rest-var)))))) (with-syntax ([(args-vars ...) (generate-temporaries (syntax (doms ...)))] [(rst-var) (generate-temporaries (syntax (rst-ctc)))] [(this-var) (generate-temporaries (syntax (this-var)))]) (syntax ((this-var args-vars ... . rst-var))))))] [(->d* x ...) (raise-syntax-error 'object-contract "malformed ->d* method contract" stx mtd-stx)] [(->r ([x dom] ...) rng) (andmap identifier? (syntax->list (syntax (x ...)))) (with-syntax ([(arg-vars ...) (generate-temporaries (syntax (x ...)))] [(this-var) (generate-temporaries (syntax (this-var)))] [this (datum->syntax-object mtd-stx 'this)]) (values obj->r/proc (syntax (->r ([this any/c] [x dom] ...) rng)) (syntax ((this-var arg-vars ...)))))] [(->r ([x dom] ...) rest-x rest-dom rng) (andmap identifier? (syntax->list (syntax (x ...)))) (with-syntax ([(arg-vars ...) (generate-temporaries (syntax (x ...)))] [(this-var) (generate-temporaries (syntax (this-var)))] [this (datum->syntax-object mtd-stx 'this)]) (values obj->r/proc (syntax (->r ([this any/c] [x dom] ...) rest-x rest-dom rng)) (syntax ((this-var arg-vars ... . rest-var)))))] [(->r . x) (raise-syntax-error 'object-contract "malformed ->r declaration")] [(->pp ([x dom] ...) . other-stuff) (andmap identifier? (syntax->list (syntax (x ...)))) (with-syntax ([(arg-vars ...) (generate-temporaries (syntax (x ...)))] [(this-var) (generate-temporaries (syntax (this-var)))] [this (datum->syntax-object mtd-stx 'this)]) (values obj->pp/proc (syntax (->pp ([this any/c] [x dom] ...) . other-stuff)) (syntax ((this-var arg-vars ...)))))] [(->pp . x) (raise-syntax-error 'object-contract "malformed ->pp declaration")] [(->pp-rest ([x dom] ...) rest-id . other-stuff) (and (identifier? (syntax id)) (andmap identifier? (syntax->list (syntax (x ...))))) (with-syntax ([(arg-vars ...) (generate-temporaries (syntax (x ...)))] [(this-var) (generate-temporaries (syntax (this-var)))] [this (datum->syntax-object mtd-stx 'this)]) (values obj->pp-rest/proc (syntax (->pp ([this any/c] [x dom] ...) rest-id . other-stuff)) (syntax ((this-var arg-vars ... . rest-id)))))] [(->pp-rest . x) (raise-syntax-error 'object-contract "malformed ->pp-rest declaration")] [else (raise-syntax-error 'object-contract "unknown method contract syntax" stx mtd-stx)])) ;; build-methods-stx : syntax[list of lambda arg specs] -> syntax[method realized as proc] (define (build-methods-stx mtds) (let loop ([arg-spec-stxss (map mtd-mtd-arg-stx mtds)] [names (map mtd-name mtds)] [i 0]) (cond [(null? arg-spec-stxss) null] [else (let ([arg-spec-stxs (car arg-spec-stxss)]) (with-syntax ([(cases ...) (map (lambda (arg-spec-stx) (with-syntax ([i i]) (syntax-case arg-spec-stx () [(this rest-ids ...) (syntax ((this rest-ids ...) ((field-ref this i) (wrapper-object-wrapped this) rest-ids ...)))] [else (let-values ([(this rest-ids last-var) (let ([lst (syntax->improper-list arg-spec-stx)]) (values (car lst) (all-but-last (cdr lst)) (cdr (last-pair lst))))]) (with-syntax ([this this] [(rest-ids ...) rest-ids] [last-var last-var]) (syntax ((this rest-ids ... . last-var) (apply (field-ref this i) (wrapper-object-wrapped this) rest-ids ... last-var)))))]))) (syntax->list arg-spec-stxs))] [name (string->symbol (format "~a method" (syntax-object->datum (car names))))]) (with-syntax ([proc (syntax-property (syntax (case-lambda cases ...)) 'method-arity-error #t)]) (cons (syntax (lambda (field-ref) (let ([name proc]) name))) (loop (cdr arg-spec-stxss) (cdr names) (+ i 1))))))]))) (define (syntax->improper-list stx) (define (se->il se) (cond [(pair? se) (sp->il se)] [else se])) (define (stx->il stx) (se->il (syntax-e stx))) (define (sp->il p) (cond [(null? (cdr p)) p] [(pair? (cdr p)) (cons (car p) (sp->il (cdr p)))] [(syntax? (cdr p)) (let ([un (syntax-e (cdr p))]) (if (pair? un) (cons (car p) (sp->il un)) p))])) (stx->il stx)) (syntax-case stx () [(_ field/mtd-specs ...) (let* ([mtd/flds (map expand-field/mtd-spec (syntax->list (syntax (field/mtd-specs ...))))] [mtds (filter mtd? mtd/flds)] [flds (filter fld? mtd/flds)]) (with-syntax ([(method-ctc-stx ...) (map mtd-ctc-stx mtds)] [(method-name ...) (map mtd-name mtds)] [(method-ctc-var ...) (generate-temporaries mtds)] [(method-pos-var ...) (generate-temporaries mtds)] [(method-neg-var ...) (generate-temporaries mtds)] [(method/app-var ...) (generate-temporaries mtds)] [(methods ...) (build-methods-stx mtds)] [(field-ctc-stx ...) (map fld-ctc-stx flds)] [(field-name ...) (map fld-name flds)] [(field-ctc-var ...) (generate-temporaries flds)] [(field-pos-var ...) (generate-temporaries flds)] [(field-neg-var ...) (generate-temporaries flds)] [(field/app-var ...) (generate-temporaries flds)]) (syntax (let ([method-ctc-var method-ctc-stx] ... [field-ctc-var (coerce-contract object-contract field-ctc-stx)] ...) (let ([method-pos-var (contract-pos-proc method-ctc-var)] ... [method-neg-var (contract-neg-proc method-ctc-var)] ... [field-pos-var (contract-pos-proc field-ctc-var)] ... [field-neg-var (contract-neg-proc field-ctc-var)] ...) (let ([cls (make-wrapper-class 'wrapper-class '(method-name ...) (list methods ...) '(field-name ...))]) (make-pair-proj-contract `(object-contract ,(build-compound-type-name 'method-name method-ctc-var) ... ,(build-compound-type-name 'field 'field-name field-ctc-var) ...) (lambda (blame src-info orig-str) (let ([method/app-var (method-pos-var blame src-info orig-str)] ... [field/app-var (field-pos-var blame src-info orig-str)] ...) (let ([field-names-list '(field-name ...)]) (lambda (val) (check-object val src-info blame orig-str) (let ([val-mtd-names (interface->method-names (object-interface val))]) (void) (check-method val 'method-name val-mtd-names src-info blame orig-str) ...) (unless (field-bound? field-name val) (field-error val 'field-name src-info blame orig-str)) ... (let ([vtable (extract-vtable val)] [method-ht (extract-method-ht val)]) (make-object cls val (method/app-var (vector-ref vtable (hash-table-get method-ht 'method-name))) ... (field/app-var (get-field field-name val)) ... )))))) (lambda (blame src-info orig-str) (let ([method/app-var (method-neg-var blame src-info orig-str)] ... [field/app-var (field-neg-var blame src-info orig-str)] ...) (let ([field-names-list '(field-name ...)]) (lambda (val) (let ([vtable (extract-vtable val)] [method-ht (extract-method-ht val)]) (make-object cls val (method/app-var (vector-ref vtable (hash-table-get method-ht 'method-name))) ... (field/app-var (get-field field-name val)) ... )))))))))))))])) ;; ensure-no-duplicates : syntax (listof syntax[identifier]) -> void (define (ensure-no-duplicates stx form-name names) (let ([ht (make-hash-table)]) (for-each (lambda (name) (let ([key (syntax-e name)]) (when (hash-table-get ht key (lambda () #f)) (raise-syntax-error form-name "duplicate method name" stx name)) (hash-table-put! ht key #t))) names))) ;; method-specifier? : syntax -> boolean ;; returns #t if x is the syntax for a valid method specifier (define (method-specifier? x) (or (eq? 'public (syntax-e x)) (eq? 'override (syntax-e x)))) ;; prefix-super : syntax[identifier] -> syntax[identifier] ;; adds super- to the front of the identifier (define (prefix-super stx) (datum->syntax-object #'here (string->symbol (format "super-~a" (syntax-object->datum stx))))) ;; method-name->contract-method-name : syntax[identifier] -> syntax[identifier] ;; given the syntax for a method name, constructs the name of a method ;; that returns the super's contract for the original method. (define (method-name->contract-method-name stx) (datum->syntax-object #'here (string->symbol (format "ACK_DONT_GUESS_ME-super-contract-~a" (syntax-object->datum stx))))) ;; Each of the /h functions builds six pieces of syntax: ;; - [arguments-check] ;; code that binds the contract values to names and ;; does error checking for the contract specs ;; (were the arguments all contracts?) ;; - [build-pos-proj] ;; code that partially applies the input contracts to build the positive projection ;; - [build-neg-proj] ;; code that partially applies the input contracts to build the negative projection ;; - [check-val] ;; code that does error checking on the contract'd value itself ;; (is it a function of the right arity?) ;; - [pos-wrapper] ;; a piece of syntax that has the arguments to the wrapper ;; and the body of the wrapper. ;; - [neg-wrapper] ;; a piece of syntax that has the arguments to the wrapper ;; and the body of the wrapper. ;; the first function accepts a body expression and wraps ;; the body expression with checks. In addition, it ;; adds a let that binds the contract exprssions to names ;; the results of the other functions mention these names. ;; the second and third function's input syntax should be five ;; names: val, blame, src-info, orig-str, name-id ;; the fourth function returns a syntax list with two elements, ;; the argument list (to be used as the first arg to lambda, ;; or as a case-lambda clause) and the body of the function. ;; They are combined into a lambda for the -> ->* ->d ->d* macros, ;; and combined into a case-lambda for the case-> macro. ;; ->/h : boolean stx -> (values (syntax -> syntax) (syntax -> syntax) (syntax -> syntax)) (define (->/h method-proc? stx) (syntax-case stx () [(_) (raise-syntax-error '-> "expected at least one argument" stx)] [(_ dom ... rng) (with-syntax ([(dom-pos-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-neg-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-contract-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-projection-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-length dom-index ...) (generate-indicies (syntax (dom ...)))] [(dom-ant-x ...) (generate-temporaries (syntax (dom ...)))] [(arg-x ...) (generate-temporaries (syntax (dom ...)))]) (with-syntax ([(name-dom-contract-x ...) (if method-proc? (cdr (syntax->list (syntax (dom-contract-x ...)))) (syntax (dom-contract-x ...)))]) (syntax-case* (syntax rng) (any values) module-or-top-identifier=? [any (let ([wrap (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax ((arg-x ...) (val (dom-projection-x arg-x) ...)))))]) (values (lambda (outer-args body) (with-syntax ([body body] [(val blame src-info orig-str name-id) outer-args]) (syntax (let ([dom-contract-x (coerce-contract -> dom)] ...) (let ([dom-pos-x (contract-pos-proc dom-contract-x)] ... [dom-neg-x (contract-neg-proc dom-contract-x)] ...) (let ([name-id (build-compound-type-name '-> name-dom-contract-x ... 'any)]) body)))))) ;; pos (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-neg-x blame src-info orig-str)] ...) inner-lambda)))) ;; neg (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-pos-x blame src-info orig-str)] ...) inner-lambda)))) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax (check-procedure val dom-length src-info blame orig-str)))) wrap wrap))] [(values rng ...) (with-syntax ([(rng-pos-x ...) (generate-temporaries (syntax (rng ...)))] [(rng-neg-x ...) (generate-temporaries (syntax (rng ...)))] [(rng-contract-x ...) (generate-temporaries (syntax (rng ...)))] [(rng-projection-x ...) (generate-temporaries (syntax (rng ...)))] [(rng-length rng-index ...) (generate-indicies (syntax (rng ...)))] [(rng-ant-x ...) (generate-temporaries (syntax (rng ...)))] [(res-x ...) (generate-temporaries (syntax (rng ...)))]) (let ([wrap (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax ((arg-x ...) (let-values ([(res-x ...) (val (dom-projection-x arg-x) ...)]) (values (rng-projection-x res-x) ...))))))]) (values (lambda (outer-args body) (with-syntax ([body body] [(val blame src-info orig-str name-id) outer-args]) (syntax (let ([dom-contract-x (coerce-contract -> dom)] ... [rng-contract-x (coerce-contract -> rng)] ...) (let ([dom-pos-x (contract-pos-proc dom-contract-x)] ... [dom-neg-x (contract-neg-proc dom-contract-x)] ... [rng-pos-x (contract-pos-proc rng-contract-x)] ... [rng-neg-x (contract-neg-proc rng-contract-x)] ...) (let ([name-id (build-compound-type-name '-> name-dom-contract-x ... (build-compound-type-name 'values rng-contract-x ...))]) body)))))) ;; pos (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-neg-x blame src-info orig-str)] ... [rng-projection-x (rng-pos-x blame src-info orig-str)] ...) inner-lambda)))) ;; neg (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-pos-x blame src-info orig-str)] ... [rng-projection-x (rng-neg-x blame src-info orig-str)] ...) inner-lambda)))) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax (check-procedure val dom-length src-info blame orig-str)))) wrap wrap)))] [rng (with-syntax ([(rng-pos-x) (generate-temporaries (syntax (rng)))] [(rng-neg-x) (generate-temporaries (syntax (rng)))] [(rng-contact-x) (generate-temporaries (syntax (rng)))] [(rng-projection-x) (generate-temporaries (syntax (rng)))] [(rng-ant-x) (generate-temporaries (syntax (rng)))] [(res-x) (generate-temporaries (syntax (rng)))]) (let ([wrap (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax ((arg-x ...) (let ([res-x (val (dom-projection-x arg-x) ...)]) (rng-projection-x res-x))))))]) (values (lambda (outer-args body) (with-syntax ([body body] [(val blame src-info orig-str name-id) outer-args]) (syntax (let ([dom-contract-x (coerce-contract -> dom)] ... [rng-contract-x (coerce-contract -> rng)]) (let ([dom-pos-x (contract-pos-proc dom-contract-x)] ... [dom-neg-x (contract-neg-proc dom-contract-x)] ... [rng-pos-x (contract-pos-proc rng-contract-x)] [rng-neg-x (contract-neg-proc rng-contract-x)]) (let ([name-id (build-compound-type-name '-> name-dom-contract-x ... rng-contract-x)]) body)))))) ;; pos (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-neg-x blame src-info orig-str)] ... [rng-projection-x (rng-pos-x blame src-info orig-str)]) inner-lambda)))) ;; neg (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-pos-x blame src-info orig-str)] ... [rng-projection-x (rng-neg-x blame src-info orig-str)]) inner-lambda)))) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax (check-procedure val dom-length src-info blame orig-str)))) wrap wrap)))])))])) ;; ->*/h : boolean stx -> (values (syntax -> syntax) (syntax syntax -> syntax) (syntax -> syntax) (syntax -> syntax)) (define (->*/h method-proc? stx) (syntax-case stx (any) [(_ (dom ...) (rng ...)) (->/h method-proc? (syntax (-> dom ... (values rng ...))))] [(_ (dom ...) any) (->/h method-proc? (syntax (-> dom ... any)))] [(_ (dom ...) rest (rng ...)) (with-syntax ([(dom-neg-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-pos-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-contract-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-projection-x ...) (generate-temporaries (syntax (dom ...)))] [(arg-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-length dom-index ...) (generate-indicies (syntax (dom ...)))] [(dom-ant-x ...) (generate-temporaries (syntax (dom ...)))] [dom-rest-x (car (generate-temporaries (list (syntax rest))))] [dom-rest-contract-x (car (generate-temporaries (list (syntax rest))))] [dom-rest-projection-x (car (generate-temporaries (list (syntax rest))))] [arg-rest-x (car (generate-temporaries (list (syntax rest))))] [(rng-pos-x ...) (generate-temporaries (syntax (rng ...)))] [(rng-neg-x ...) (generate-temporaries (syntax (rng ...)))] [(rng-contract-x ...) (generate-temporaries (syntax (rng ...)))] [(rng-projection-x ...) (generate-temporaries (syntax (rng ...)))] [(rng-length rng-index ...) (generate-indicies (syntax (rng ...)))] [(rng-ant-x ...) (generate-temporaries (syntax (rng ...)))] [(res-x ...) (generate-temporaries (syntax (rng ...)))] [arity (length (syntax->list (syntax (dom ...))))]) (let ([wrap (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax ((arg-x ... . arg-rest-x) (let-values ([(res-x ...) (apply val (dom-projection-x arg-x) ... (dom-rest-projection-x arg-rest-x))]) (values (rng-projection-x res-x) ...))))))]) (values (lambda (outer-args body) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [body body] [(name-dom-contract-x ...) (if method-proc? (cdr (syntax->list (syntax (dom-contract-x ...)))) (syntax (dom-contract-x ...)))]) (syntax (let ([dom-contract-x (coerce-contract ->* dom)] ... [dom-rest-contract-x (coerce-contract ->* rest)] [rng-contract-x (coerce-contract ->* rng)] ...) (let ([dom-pos-x (contract-pos-proc dom-contract-x)] ... [dom-neg-x (contract-neg-proc dom-contract-x)] ... [dom-pos-rest-x (contract-pos-proc dom-rest-contract-x)] [dom-neg-rest-x (contract-neg-proc dom-rest-contract-x)] [rng-pos-x (contract-pos-proc rng-contract-x)] ... [rng-neg-x (contract-neg-proc rng-contract-x)] ...) (let ([name-id (build-compound-type-name '->* (build-compound-type-name dom-contract-x ...) dom-rest-contract-x (build-compound-type-name rng-contract-x ...))]) body)))))) ;; pos (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-neg-x blame src-info orig-str)] ... [dom-rest-projection-x (dom-neg-rest-x blame src-info orig-str)] [rng-projection-x (rng-pos-x blame src-info orig-str)] ...) inner-lambda)))) ;; neg (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-pos-x blame src-info orig-str)] ... [dom-rest-projection-x (dom-pos-rest-x blame src-info orig-str)] [rng-projection-x (rng-neg-x blame src-info orig-str)] ...) inner-lambda)))) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax (check-procedure/more val dom-length src-info blame orig-str)))) wrap wrap)))] [(_ (dom ...) rest any) (with-syntax ([(dom-pos-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-neg-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-contract-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-projection-x ...) (generate-temporaries (syntax (dom ...)))] [(arg-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-length dom-index ...) (generate-indicies (syntax (dom ...)))] [(dom-ant-x ...) (generate-temporaries (syntax (dom ...)))] [dom-neg-rest-x (car (generate-temporaries (list (syntax rest))))] [dom-pos-rest-x (car (generate-temporaries (list (syntax rest))))] [dom-rest-contract-x (car (generate-temporaries (list (syntax rest))))] [dom-projection-rest-x (car (generate-temporaries (list (syntax rest))))] [arg-rest-x (car (generate-temporaries (list (syntax rest))))] [arity (length (syntax->list (syntax (dom ...))))]) (let ([wrap (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax ((arg-x ... . arg-rest-x) (apply val (dom-projection-x arg-x) ... (dom-projection-rest-x arg-rest-x))))))]) (values (lambda (outer-args body) (with-syntax ([body body] [(val blame src-info orig-str name-id) outer-args] [(name-dom-contract-x ...) (if method-proc? (cdr (syntax->list (syntax (dom-contract-x ...)))) (syntax (dom-contract-x ...)))]) (syntax (let ([dom-contract-x (coerce-contract ->* dom)] ... [dom-rest-contract-x (coerce-contract ->* rest)]) (let ([dom-pos-x (contract-pos-proc dom-contract-x)] ... [dom-neg-x (contract-neg-proc dom-contract-x)] ... [dom-pos-rest-x (contract-pos-proc dom-rest-contract-x)] [dom-neg-rest-x (contract-neg-proc dom-rest-contract-x)]) (let ([name-id (build-compound-type-name '->* (build-compound-type-name name-dom-contract-x ...) dom-rest-contract-x 'any)]) body)))))) ;; pos (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-neg-x blame src-info orig-str)] ... [dom-projection-rest-x (dom-neg-rest-x blame src-info orig-str)]) inner-lambda)))) ;; neg (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-pos-x blame src-info orig-str)] ... [dom-projection-rest-x (dom-pos-rest-x blame src-info orig-str)]) inner-lambda)))) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax (check-procedure/more val dom-length src-info blame orig-str)))) wrap wrap)))])) ;; ->d/h : boolean stx -> (values (syntax -> syntax) (syntax -> syntax) (syntax -> syntax)) (define (->d/h method-proc? stx) (syntax-case stx () [(_) (raise-syntax-error '->d "expected at least one argument" stx)] [(_ dom ... rng) (with-syntax ([(rng-x) (generate-temporaries (syntax (rng)))] [(dom-pos-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-neg-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-contract-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-projection-x ...) (generate-temporaries (syntax (dom ...)))] [(arg-x ...) (generate-temporaries (syntax (dom ...)))] [arity (length (syntax->list (syntax (dom ...))))]) (values (lambda (outer-args body) (with-syntax ([body body] [(val blame src-info orig-str name-id) outer-args] [(name-dom-contract-x ...) (if method-proc? (cdr (syntax->list (syntax (dom-contract-x ...)))) (syntax (dom-contract-x ...)))]) (syntax (let ([dom-contract-x (coerce-contract ->d dom)] ...) (let ([dom-pos-x (contract-pos-proc dom-contract-x)] ... [dom-neg-x (contract-neg-proc dom-contract-x)] ... [rng-x rng]) (check-rng-procedure '->d rng-x arity) (let ([name-id (build-compound-type-name '->d name-dom-contract-x ... '(... ...))]) body)))))) ;; pos (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-neg-x blame src-info orig-str)] ...) inner-lambda)))) ;; neg (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-pos-x blame src-info orig-str)] ...) inner-lambda)))) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax (check-procedure val arity src-info blame orig-str)))) ;; pos (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax ((arg-x ...) (let ([arg-x (dom-projection-x arg-x)] ...) (let ([rng-contract (rng-x arg-x ...)]) (((contract-pos-proc (coerce-contract ->d rng-contract)) blame src-info orig-str) (val arg-x ...)))))))) ;; neg (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax ((arg-x ...) (let ([arg-x (dom-projection-x arg-x)] ...) (let ([rng-contract (rng-x arg-x ...)]) (((contract-neg-proc (coerce-contract ->d rng-contract)) blame src-info orig-str) (val arg-x ...))))))))))])) ;; ->d*/h : boolean stx -> (values (syntax -> syntax) (syntax -> syntax) (syntax -> syntax)) (define (->d*/h method-proc? stx) (syntax-case stx () [(_ (dom ...) rng-mk) (with-syntax ([(dom-pos-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-neg-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-contract-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-projection-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-length dom-index ...) (generate-indicies (syntax (dom ...)))] [(dom-ant-x ...) (generate-temporaries (syntax (dom ...)))] [(arg-x ...) (generate-temporaries (syntax (dom ...)))]) (let ([mk-wrap (λ (extract-proc) (with-syntax ([extract-proc extract-proc]) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax ((arg-x ...) (call-with-values (lambda () (rng-mk-x arg-x ...)) (lambda rng-contracts (call-with-values (lambda () (val (dom-projection-x arg-x) ...)) (lambda results (check-rng-lengths results rng-contracts) (apply values (map (lambda (rng-contract result) (((extract-proc (coerce-contract ->d* rng-contract)) blame src-info orig-str) result)) rng-contracts results))))))))))))]) (values (lambda (outer-args body) (with-syntax ([body body] [(val blame src-info orig-str name-id) outer-args] [(name-dom-contract-x ...) (if method-proc? (cdr (syntax->list (syntax (dom-contract-x ...)))) (syntax (dom-contract-x ...)))]) (syntax (let ([dom-contract-x (coerce-contract ->d* dom)] ...) (let ([dom-pos-x (contract-pos-proc dom-contract-x)] ... [dom-neg-x (contract-neg-proc dom-contract-x)] ... [rng-mk-x rng-mk]) (check-rng-procedure '->d* rng-mk-x dom-length) (let ([name-id (build-compound-type-name '->d* (build-compound-type-name name-dom-contract-x ...) '(... ...))]) body)))))) ;; pos (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-neg-x blame src-info orig-str)] ...) inner-lambda)))) ;; neg (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-pos-x blame src-info orig-str)] ...) inner-lambda)))) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax (check-procedure val dom-length src-info blame orig-str)))) (mk-wrap (syntax contract-pos-proc)) (mk-wrap (syntax contract-neg-proc)))))] [(_ (dom ...) rest rng-mk) (with-syntax ([(dom-neg-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-pos-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-contract-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-projection-x ...) (generate-temporaries (syntax (dom ...)))] [(dom-pos-rest-x) (generate-temporaries (syntax (rest)))] [(dom-neg-rest-x) (generate-temporaries (syntax (rest)))] [(dom-rest-contract-x) (generate-temporaries (syntax (rest)))] [(dom-rest-projection-x) (generate-temporaries (syntax (rest)))] [(arg-x ...) (generate-temporaries (syntax (dom ...)))] [arity (length (syntax->list (syntax (dom ...))))]) (let ([mk-wrap (λ (extract-proj) (with-syntax ([extract-proj extract-proj]) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax ((arg-x ... . rest-arg-x) (call-with-values (lambda () (apply rng-mk-x arg-x ... rest-arg-x)) (lambda rng-contracts (call-with-values (lambda () (apply val (dom-projection-x arg-x) ... (dom-rest-projection-x rest-arg-x))) (lambda results (check-rng-lengths results rng-contracts) (apply values (map (lambda (rng-contract result) (((extract-proj (coerce-contract ->d* rng-contract)) blame src-info orig-str) result)) rng-contracts results))))))))))))]) (values (lambda (outer-args body) (with-syntax ([body body] [(val blame src-info orig-str name-id) outer-args] [(name-dom-contract-x ...) (if method-proc? (cdr (syntax->list (syntax (dom-contract-x ...)))) (syntax (dom-contract-x ...)))]) (syntax (let ([dom-contract-x (coerce-contract ->d* dom)] ... [dom-rest-contract-x (coerce-contract ->d* rest)]) (let ([dom-pos-x (contract-pos-proc dom-contract-x)] ... [dom-neg-x (contract-neg-proc dom-contract-x)] ... [dom-pos-rest-x (contract-pos-proc dom-rest-contract-x)] [dom-neg-rest-x (contract-neg-proc dom-rest-contract-x)] [rng-mk-x rng-mk]) (check-rng-procedure/more rng-mk-x arity) (let ([name-id (build-compound-type-name '->d* (build-compound-type-name name-dom-contract-x ...) dom-rest-contract-x '(... ...))]) body)))))) ;; pos (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-neg-x blame src-info orig-str)] ... [dom-rest-projection-x (dom-neg-rest-x blame src-info orig-str)]) inner-lambda)))) ;; neg (lambda (outer-args inner-lambda) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [inner-lambda inner-lambda]) (syntax (let ([dom-projection-x (dom-pos-x blame src-info orig-str)] ... [dom-rest-projection-x (dom-pos-rest-x blame src-info orig-str)]) inner-lambda)))) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax (check-procedure/more val arity src-info blame orig-str)))) (mk-wrap (syntax contract-pos-proc)) (mk-wrap (syntax contract-neg-proc)))))])) ;; ->r/h : boolean stx -> (values (syntax -> syntax) (syntax -> syntax) (syntax -> syntax)) (define (->r/h method-proc? stx) (syntax-case stx () [(_ ([x dom] ...) rng) (syntax-case* (syntax rng) (any values) module-or-top-identifier=? [any (->r-pp/h method-proc? '->r (syntax (->r ([x dom] ...) #t any)))] [(values . args) (->r-pp/h method-proc? '->r (syntax (->r ([x dom] ...) #t rng #t)))] [rng (->r-pp/h method-proc? '->r (syntax (->r ([x dom] ...) #t rng unused-id #t)))] [_ (raise-syntax-error '->r "unknown result contract spec" stx (syntax rng))])] [(_ ([x dom] ...) rest-x rest-dom rng) (syntax-case* (syntax rng) (values any) module-or-top-identifier=? [any (->r-pp-rest/h method-proc? '->r (syntax (->r ([x dom] ...) rest-x rest-dom #t any)))] [(values . whatever) (->r-pp-rest/h method-proc? '->r (syntax (->r ([x dom] ...) rest-x rest-dom #t rng #t)))] [_ (->r-pp-rest/h method-proc? '->r (syntax (->r ([x dom] ...) rest-x rest-dom #t rng unused-id #t)))])])) ;; ->pp/h : boolean stx -> (values (syntax -> syntax) (syntax -> syntax) (syntax -> syntax)) (define (->pp/h method-proc? stx) (->r-pp/h method-proc? '->pp stx)) ;; ->pp/h : boolean symbol stx -> (values (syntax -> syntax) (syntax -> syntax) (syntax -> syntax)) (define (->r-pp/h method-proc? name stx) (syntax-case stx () [(_ ([x dom] ...) pre-expr . result-stuff) (and (andmap identifier? (syntax->list (syntax (x ...)))) (not (check-duplicate-identifier (syntax->list (syntax (x ...)))))) (with-syntax ([stx-name name]) (with-syntax ([(dom-id ...) (generate-temporaries (syntax (dom ...)))] [arity (length (syntax->list (syntax (dom ...))))] [name-stx (with-syntax ([(name-xs ...) (if method-proc? (cdr (syntax->list (syntax (x ...)))) (syntax (x ...)))]) (syntax (build-compound-type-name 'stx-name (build-compound-type-name (build-compound-type-name 'name-xs '(... ...)) ...) '(... ...))))]) (values (lambda (outer-args body) (with-syntax ([body body] [(val blame src-info orig-str name-id) outer-args]) (syntax (let ([name-id name-stx]) body)))) (lambda (outer-args inner-lambda) inner-lambda) (lambda (outer-args inner-lambda) inner-lambda) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [kind-of-thing (if method-proc? 'method 'procedure)]) (syntax (begin (check-procedure/kind val arity 'kind-of-thing src-info blame orig-str))))) ;; pos (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax-case* (syntax result-stuff) (any values) module-or-top-identifier=? [(any) (syntax ((x ...) (let ([dom-id ((contract-neg-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ...) (val (dom-id x) ...))))] [((values (rng-ids rng-ctc) ...) post-expr) (and (andmap identifier? (syntax->list (syntax (rng-ids ...)))) (not (check-duplicate-identifier (syntax->list (syntax (rng-ids ...)))))) (with-syntax ([(rng-ids-x ...) (generate-temporaries (syntax (rng-ids ...)))]) (syntax ((x ...) (begin (let ([dom-id ((contract-neg-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ...) (let-values ([(rng-ids ...) (val (dom-id x) ...)]) (check-post-expr->pp/h val post-expr src-info blame orig-str) (let ([rng-ids-x ((contract-pos-proc (coerce-contract stx-name rng-ctc)) blame src-info orig-str)] ...) (values (rng-ids-x rng-ids) ...))))))))] [((values (rng-ids rng-ctc) ...) post-expr) (andmap identifier? (syntax->list (syntax (rng-ids ...)))) (let ([dup (check-duplicate-identifier (syntax->list (syntax (rng-ids ...))))]) (raise-syntax-error name "duplicate identifier" stx dup))] [((values (rng-ids rng-ctc) ...) post-expr) (for-each (lambda (rng-id) (unless (identifier? rng-id) (raise-syntax-error name "expected identifier" stx rng-id))) (syntax->list (syntax (rng-ids ...))))] [((values . x) . junk) (raise-syntax-error name "malformed multiple values result" stx (syntax (values . x)))] [(rng res-id post-expr) (syntax ((x ...) (let ([dom-id ((contract-neg-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ... [rng-id ((contract-pos-proc (coerce-contract stx-name rng)) blame src-info orig-str)]) (let ([res-id (rng-id (val (dom-id x) ...))]) (check-post-expr->pp/h val post-expr src-info blame orig-str) res-id))))] [_ (raise-syntax-error name "unknown result specification" stx (syntax result-stuff))]))) ;; neg (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax-case* (syntax result-stuff) (any values) module-or-top-identifier=? [(any) (syntax ((x ...) (begin (check-pre-expr->pp/h val pre-expr src-info blame orig-str) (let ([dom-id ((contract-pos-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ...) (val (dom-id x) ...)))))] [((values (rng-ids rng-ctc) ...) post-expr) (and (andmap identifier? (syntax->list (syntax (rng-ids ...)))) (not (check-duplicate-identifier (syntax->list (syntax (rng-ids ...)))))) (with-syntax ([(rng-ids-x ...) (generate-temporaries (syntax (rng-ids ...)))]) (syntax ((x ...) (begin (check-pre-expr->pp/h val pre-expr src-info blame orig-str) (let ([dom-id ((contract-pos-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ...) (let-values ([(rng-ids ...) (val (dom-id x) ...)]) (let ([rng-ids-x ((contract-neg-proc (coerce-contract stx-name rng-ctc)) blame src-info orig-str)] ...) (values (rng-ids-x rng-ids) ...))))))))] [((values (rng-ids rng-ctc) ...) post-expr) (andmap identifier? (syntax->list (syntax (rng-ids ...)))) (let ([dup (check-duplicate-identifier (syntax->list (syntax (rng-ids ...))))]) (raise-syntax-error name "duplicate identifier" stx dup))] [((values (rng-ids rng-ctc) ...) post-expr) (for-each (lambda (rng-id) (unless (identifier? rng-id) (raise-syntax-error name "expected identifier" stx rng-id))) (syntax->list (syntax (rng-ids ...))))] [((values . x) . junk) (raise-syntax-error name "malformed multiple values result" stx (syntax (values . x)))] [(rng res-id post-expr) (syntax ((x ...) (begin (check-pre-expr->pp/h val pre-expr src-info blame orig-str) (let ([dom-id ((contract-pos-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ... [rng-id ((contract-neg-proc (coerce-contract stx-name rng)) blame src-info orig-str)]) (rng-id (val (dom-id x) ...))))))] [_ (raise-syntax-error name "unknown result specification" stx (syntax result-stuff))]))))))] [(_ ([x dom] ...) pre-expr . result-stuff) (andmap identifier? (syntax->list (syntax (x ...)))) (raise-syntax-error name "duplicate identifier" stx (check-duplicate-identifier (syntax->list (syntax (x ...)))))] [(_ ([x dom] ...) pre-expr . result-stuff) (for-each (lambda (x) (unless (identifier? x) (raise-syntax-error name "expected identifier" stx x))) (syntax->list (syntax (x ...))))] [(_ (x ...) pre-expr . result-stuff) (for-each (lambda (x) (syntax-case x () [(x y) (identifier? (syntax x)) (void)] [bad (raise-syntax-error name "expected identifier and contract" stx (syntax bad))])) (syntax->list (syntax (x ...))))] [(_ x dom pre-expr . result-stuff) (raise-syntax-error name "expected list of identifiers and expression pairs" stx (syntax x))])) ;; ->pp-rest/h : boolean stx -> (values (syntax -> syntax) (syntax -> syntax) (syntax -> syntax)) (define (->pp-rest/h method-proc? stx) (->r-pp-rest/h method-proc? '->pp-rest stx)) ;; ->r-pp-rest/h : boolean stx -> (values (syntax -> syntax) (syntax -> syntax) (syntax -> syntax)) (define (->r-pp-rest/h method-proc? name stx) (syntax-case stx () [(_ ([x dom] ...) rest-x rest-dom pre-expr . result-stuff) (and (identifier? (syntax rest-x)) (andmap identifier? (syntax->list (syntax (x ...)))) (not (check-duplicate-identifier (cons (syntax rest-x) (syntax->list (syntax (x ...))))))) (with-syntax ([stx-name name]) (with-syntax ([(dom-id ...) (generate-temporaries (syntax (dom ...)))] [arity (length (syntax->list (syntax (dom ...))))] [name-stx (with-syntax ([(name-xs ...) (if method-proc? (cdr (syntax->list (syntax (x ...)))) (syntax (x ...)))]) (syntax (build-compound-type-name 'stx-name `(,(build-compound-type-name 'name-xs '(... ...)) ...) 'rest-x '(... ...) '(... ...))))]) (values (lambda (outer-args body) (with-syntax ([body body] [(val blame src-info orig-str name-id) outer-args]) (syntax (let ([name-id name-stx]) body)))) (lambda (outer-args inner-lambda) inner-lambda) (lambda (outer-args inner-lambda) inner-lambda) (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args] [kind-of-thing (if method-proc? 'method 'procedure)]) (syntax (begin (check-procedure/more/kind val arity 'kind-of-thing src-info blame orig-str))))) ;; pos (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax-case* (syntax result-stuff) (values any) module-or-top-identifier=? [(any) (syntax ((x ... . rest-x) (let ([dom-id ((contract-neg-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ... [rest-id ((contract-neg-proc (coerce-contract stx-name rest-dom)) blame src-info orig-str)]) (apply val (dom-id x) ... (rest-id rest-x)))))] [(any . x) (raise-syntax-error name "cannot have anything after any" stx (syntax result-stuff))] [((values (rng-ids rng-ctc) ...) post-expr) (and (andmap identifier? (syntax->list (syntax (rng-ids ...)))) (not (check-duplicate-identifier (syntax->list (syntax (rng-ids ...)))))) (with-syntax ([(rng-ids-x ...) (generate-temporaries (syntax (rng-ids ...)))]) (syntax ((x ... . rest-x) (let ([dom-id ((contract-neg-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ... [rest-id ((contract-neg-proc (coerce-contract stx-name rest-dom)) blame src-info orig-str)]) (let-values ([(rng-ids ...) (apply val (dom-id x) ... (rest-id rest-x))]) (check-post-expr->pp/h val post-expr src-info blame orig-str) (let ([rng-ids-x ((contract-pos-proc (coerce-contract stx-name rng-ctc)) blame src-info orig-str)] ...) (values (rng-ids-x rng-ids) ...)))))))] [((values (rng-ids rng-ctc) ...) . whatever) (and (andmap identifier? (syntax->list (syntax (rng-ids ...)))) (not (check-duplicate-identifier (syntax->list (syntax (rng-ids ...)))))) (raise-syntax-error name "expected exactly on post-expression at the end" stx)] [((values (rng-ids rng-ctc) ...) . whatever) (andmap identifier? (syntax->list (syntax (rng-ids ...)))) (let ([dup (check-duplicate-identifier (syntax->list (syntax (rng-ids ...))))]) (raise-syntax-error name "duplicate identifier" stx dup))] [((values (rng-ids rng-ctc) ...) . whatever) (for-each (lambda (rng-id) (unless (identifier? rng-id) (raise-syntax-error name "expected identifier" stx rng-id))) (syntax->list (syntax (rng-ids ...))))] [((values . x) . whatever) (raise-syntax-error name "malformed multiple values result" stx (syntax (values . x)))] [(rng res-id post-expr) (identifier? (syntax res-id)) (syntax ((x ... . rest-x) (let ([dom-id ((contract-neg-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ... [rest-id ((contract-neg-proc (coerce-contract stx-name rest-dom)) blame src-info orig-str)] [rng-id ((contract-pos-proc (coerce-contract stx-name rng)) blame src-info orig-str)]) (let ([res-id (rng-id (apply val (dom-id x) ... (rest-id rest-x)))]) (check-post-expr->pp/h val post-expr src-info blame orig-str) res-id))))] [(rng res-id post-expr) (not (identifier? (syntax res-id))) (raise-syntax-error name "expected an identifier" stx (syntax res-id))] [_ (raise-syntax-error name "malformed result sepecification" stx (syntax result-stuff))]))) ;; neg (lambda (outer-args) (with-syntax ([(val blame src-info orig-str name-id) outer-args]) (syntax-case* (syntax result-stuff) (values any) module-or-top-identifier=? [(any) (syntax ((x ... . rest-x) (begin (check-pre-expr->pp/h val pre-expr src-info blame orig-str) (let ([dom-id ((contract-pos-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ... [rest-id ((contract-pos-proc (coerce-contract stx-name rest-dom)) blame src-info orig-str)]) (apply val (dom-id x) ... (rest-id rest-x))))))] [(any . x) (raise-syntax-error name "cannot have anything after any" stx (syntax result-stuff))] [((values (rng-ids rng-ctc) ...) post-expr) (and (andmap identifier? (syntax->list (syntax (rng-ids ...)))) (not (check-duplicate-identifier (syntax->list (syntax (rng-ids ...)))))) (with-syntax ([(rng-ids-x ...) (generate-temporaries (syntax (rng-ids ...)))]) (syntax ((x ... . rest-x) (begin (check-pre-expr->pp/h val pre-expr src-info blame orig-str) (let ([dom-id ((contract-pos-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ... [rest-id ((contract-pos-proc (coerce-contract stx-name rest-dom)) blame src-info orig-str)]) (let-values ([(rng-ids ...) (apply val (dom-id x) ... (rest-id rest-x))]) (let ([rng-ids-x ((contract-neg-proc (coerce-contract stx-name rng-ctc)) blame src-info orig-str)] ...) (values (rng-ids-x rng-ids) ...))))))))] [((values (rng-ids rng-ctc) ...) . whatever) (and (andmap identifier? (syntax->list (syntax (rng-ids ...)))) (not (check-duplicate-identifier (syntax->list (syntax (rng-ids ...)))))) (raise-syntax-error name "expected exactly on post-expression at the end" stx)] [((values (rng-ids rng-ctc) ...) . whatever) (andmap identifier? (syntax->list (syntax (rng-ids ...)))) (let ([dup (check-duplicate-identifier (syntax->list (syntax (rng-ids ...))))]) (raise-syntax-error name "duplicate identifier" stx dup))] [((values (rng-ids rng-ctc) ...) . whatever) (for-each (lambda (rng-id) (unless (identifier? rng-id) (raise-syntax-error name "expected identifier" stx rng-id))) (syntax->list (syntax (rng-ids ...))))] [((values . x) . whatever) (raise-syntax-error name "malformed multiple values result" stx (syntax (values . x)))] [(rng res-id post-expr) (identifier? (syntax res-id)) (syntax ((x ... . rest-x) (begin (check-pre-expr->pp/h val pre-expr src-info blame orig-str) (let ([dom-id ((contract-pos-proc (coerce-contract stx-name dom)) blame src-info orig-str)] ... [rest-id ((contract-pos-proc (coerce-contract stx-name rest-dom)) blame src-info orig-str)] [rng-id ((contract-neg-proc (coerce-contract stx-name rng)) blame src-info orig-str)]) (rng-id (apply val (dom-id x) ... (rest-id rest-x)))))))] [(rng res-id post-expr) (not (identifier? (syntax res-id))) (raise-syntax-error name "expected an identifier" stx (syntax res-id))] [_ (raise-syntax-error name "malformed result sepecification" stx (syntax result-stuff))]))))))] [(_ ([x dom] ...) rest-x rest-dom pre-expr . result-stuff) (not (identifier? (syntax rest-x))) (raise-syntax-error name "expected identifier" stx (syntax rest-x))] [(_ ([x dom] ...) rest-x rest-dom rng . result-stuff) (and (identifier? (syntax rest-x)) (andmap identifier? (cons (syntax rest-x) (syntax->list (syntax (x ...)))))) (raise-syntax-error name "duplicate identifier" stx (check-duplicate-identifier (syntax->list (syntax (x ...)))))] [(_ ([x dom] ...) rest-x rest-dom rng . result-stuff) (for-each (lambda (x) (unless (identifier? x) (raise-syntax-error name "expected identifier" stx x))) (cons (syntax rest-x) (syntax->list (syntax (x ...)))))] [(_ x dom rest-x rest-dom rng . result-stuff) (raise-syntax-error name "expected list of identifiers and expression pairs" stx (syntax x))])) ;; select/h : syntax -> /h-function (define (select/h stx err-name ctxt-stx) (syntax-case stx (-> ->* ->d ->d* ->r ->pp ->pp-rest) [(-> . args) ->/h] [(->* . args) ->*/h] [(->d . args) ->d/h] [(->d* . args) ->d*/h] [(->r . args) ->r/h] [(->pp . args) ->pp/h] [(->pp-rest . args) ->pp-rest/h] [(xxx . args) (raise-syntax-error err-name "unknown arrow constructor" ctxt-stx (syntax xxx))] [_ (raise-syntax-error err-name "malformed arrow clause" ctxt-stx stx)])) ;; set-inferred-name-from : syntax syntax -> syntax (define (set-inferred-name-from with-name to-be-named) (let ([name (syntax-local-infer-name with-name)]) (cond [(identifier? name) (with-syntax ([rhs (syntax-property to-be-named 'inferred-name (syntax-e name))] [name (syntax-e name)]) (syntax (let ([name rhs]) name)))] [(symbol? name) (with-syntax ([rhs (syntax-property to-be-named 'inferred-name name)] [name name]) (syntax (let ([name rhs]) name)))] [else to-be-named]))) ;; generate-indicies : syntax[list] -> (cons number (listof number)) ;; given a syntax list of length `n', returns a list containing ;; the number n followed by th numbers from 0 to n-1 (define (generate-indicies stx) (let ([n (length (syntax->list stx))]) (cons n (let loop ([i n]) (cond [(zero? i) null] [else (cons (- n i) (loop (- i 1)))])))))) ;; procedure-accepts-and-more? : procedure number -> boolean ;; returns #t if val accepts dom-length arguments and ;; any number of arguments more than dom-length. ;; returns #f otherwise. (define (procedure-accepts-and-more? val dom-length) (let ([arity (procedure-arity val)]) (cond [(number? arity) #f] [(arity-at-least? arity) (<= (arity-at-least-value arity) dom-length)] [else (let ([min-at-least (let loop ([ars arity] [acc #f]) (cond [(null? ars) acc] [else (let ([ar (car ars)]) (cond [(arity-at-least? ar) (if (and acc (< acc (arity-at-least-value ar))) (loop (cdr ars) acc) (loop (cdr ars) (arity-at-least-value ar)))] [(number? ar) (loop (cdr ars) acc)]))]))]) (and min-at-least (begin (let loop ([counts (sort (filter number? arity) >=)]) (unless (null? counts) (let ([count (car counts)]) (cond [(= (+ count 1) min-at-least) (set! min-at-least count) (loop (cdr counts))] [(< count min-at-least) (void)] [else (loop (cdr counts))])))) (<= min-at-least dom-length))))]))) ;; ---------------------------------------- ;; Checks and error functions used in macro expansions (define (check->* f arity-count) (unless (procedure? f) (error 'object-contract "expected last argument of ->d* to be a procedure, got ~e" f)) (unless (procedure-arity-includes? f arity-count) (error 'object-contract "expected last argument of ->d* to be a procedure that accepts ~a arguments, got ~e" arity-count f))) (define (check->*/more f arity-count) (unless (procedure? f) (error 'object-contract "expected last argument of ->d* to be a procedure, got ~e" f)) (unless (procedure-accepts-and-more? f arity-count) (error 'object-contract "expected last argument of ->d* to be a procedure that accepts ~a argument~a and arbitrarily many more, got ~e" arity-count (if (= 1 arity-count) "" "s") f))) (define (check-pre-expr->pp/h val pre-expr src-info blame orig-str) (unless pre-expr (raise-contract-error val src-info blame orig-str "pre-condition expression failure"))) (define (check-post-expr->pp/h val post-expr src-info blame orig-str) (unless post-expr (raise-contract-error val src-info blame orig-str "post-condition expression failure"))) (define (check-procedure val dom-length src-info blame orig-str) (unless (and (procedure? val) (procedure-arity-includes? val dom-length)) (raise-contract-error val src-info blame orig-str "expected a procedure that accepts ~a arguments, given: ~e" dom-length val))) (define (check-procedure/kind val arity kind-of-thing src-info blame orig-str) (unless (procedure? val) (raise-contract-error val src-info blame orig-str "expected a procedure, got ~e" val)) (unless (procedure-arity-includes? val arity) (raise-contract-error val src-info blame orig-str "expected a ~a of arity ~a (not arity ~a), got ~e" kind-of-thing arity (procedure-arity val) val))) (define (check-procedure/more/kind val arity kind-of-thing src-info blame orig-str) (unless (procedure? val) (raise-contract-error val src-info blame orig-str "expected a procedure, got ~e" val)) (unless (procedure-accepts-and-more? val arity) (raise-contract-error val src-info blame orig-str "expected a ~a that accepts ~a arguments and aribtrarily more (not arity ~a), got ~e" kind-of-thing arity (procedure-arity val) val))) (define (check-procedure/more val dom-length src-info blame orig-str) (unless (and (procedure? val) (procedure-accepts-and-more? val dom-length)) (raise-contract-error val src-info blame orig-str "expected a procedure that accepts ~a arguments and any number of arguments larger than ~a, given: ~e" dom-length dom-length val))) (define (check-rng-procedure who rng-x arity) (unless (and (procedure? rng-x) (procedure-arity-includes? rng-x arity)) (error who "expected range position to be a procedure that accepts ~a arguments, given: ~e" arity rng-x))) (define (check-rng-procedure/more rng-mk-x arity) (unless (and (procedure? rng-mk-x) (procedure-accepts-and-more? rng-mk-x arity)) (error '->d* "expected range position to be a procedure that accepts ~a arguments and arbitrarily many more, given: ~e" arity rng-mk-x))) (define (check-rng-lengths results rng-contracts) (unless (= (length results) (length rng-contracts)) (error '->d* "expected range contract contructor and function to have the same number of values, given: ~a and ~a respectively" (length results) (length rng-contracts)))) (define (check-object val src-info blame orig-str) (unless (object? val) (raise-contract-error val src-info blame orig-str "expected an object, got ~e" val))) (define (check-method val method-name val-mtd-names src-info blame orig-str) (unless (memq method-name val-mtd-names) (raise-contract-error val src-info blame orig-str "expected an object with method ~s" method-name))) (define (field-error val field-name src-info blame orig-str) (raise-contract-error val src-info blame orig-str "expected an object with field ~s" field-name)) #| test cases for procedure-accepts-and-more? (and (procedure-accepts-and-more? (lambda (x . y) 1) 3) (procedure-accepts-and-more? (lambda (x . y) 1) 2) (procedure-accepts-and-more? (lambda (x . y) 1) 1) (not (procedure-accepts-and-more? (lambda (x . y) 1) 0)) (procedure-accepts-and-more? (case-lambda [(x . y) 1] [(y) 1]) 3) (procedure-accepts-and-more? (case-lambda [(x . y) 1] [(y) 1]) 2) (procedure-accepts-and-more? (case-lambda [(x . y) 1] [(y) 1]) 1) (not (procedure-accepts-and-more? (case-lambda [(x . y) 1] [(y) 1]) 0)) (procedure-accepts-and-more? (case-lambda [(x y . z) 1] [(x) 1]) 2) (procedure-accepts-and-more? (case-lambda [(x y . z) 1] [(x) 1]) 1) (not (procedure-accepts-and-more? (case-lambda [(x y . z) 1] [(x) 1]) 0))) |# (define (make-mixin-contract . %/<%>s) ((and/c (flat-contract class?) (apply and/c (map sub/impl?/c %/<%>s))) . ->d . subclass?/c)) (define (subclass?/c %) (unless (class? %) (error 'subclass?/c "expected , given: ~e" %)) (let ([name (object-name %)]) (flat-named-contract `(subclass?/c ,(or name 'unknown%)) (lambda (x) (subclass? x %))))) (define (implementation?/c <%>) (unless (interface? <%>) (error 'implementation?/c "expected , given: ~e" <%>)) (let ([name (object-name <%>)]) (flat-named-contract `(implementation?/c ,(or name 'unknown<%>)) (lambda (x) (implementation? x <%>))))) (define (sub/impl?/c %/<%>) (cond [(interface? %/<%>) (implementation?/c %/<%>)] [(class? %/<%>) (subclass?/c %/<%>)] [else (error 'make-mixin-contract "unknown input ~e" %/<%>)])) (define (is-a?/c <%>) (unless (or (interface? <%>) (class? <%>)) (error 'is-a?/c "expected or , given: ~e" <%>)) (let ([name (object-name <%>)]) (flat-named-contract (cond [name `(is-a?/c ,name)] [(class? <%>) `(is-a?/c unknown%)] [else `(is-a?/c unknown<%>)]) (lambda (x) (is-a? x <%>))))) (define mixin-contract (class? . ->d . subclass?/c)))