121 lines
4.4 KiB
Scheme
121 lines
4.4 KiB
Scheme
#lang scheme/base
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(require "arrow.ss"
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"guts.ss"
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scheme/private/class-internal
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scheme/stxparam)
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(require (for-syntax scheme/base))
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(provide mixin-contract
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make-mixin-contract
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is-a?/c
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subclass?/c
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implementation?/c
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object-contract)
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(define-for-syntax (parse-object-contract stx args)
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(let loop ([args (syntax->list args)]
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[mtds '()]
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[flds '()])
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(cond
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[(null? args) (list mtds flds)]
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[else (syntax-case (car args) (field)
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[(field id ctc)
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(identifier? #'id)
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(loop (cdr args) mtds (cons #'(id ctc) flds))]
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[(field . rst)
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(raise-syntax-error #f "malformed field specification" stx (car args))]
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[(id ctc)
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(identifier? #'id)
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(loop (cdr args) (cons #`(id ctc) mtds) flds)]
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[_
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(raise-syntax-error #f "malformed object-contract clause" stx (car args))])])))
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(define-struct object-contract (methods method-ctcs fields field-ctcs)
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#:omit-define-syntaxes
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#:property prop:contract
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(build-contract-property
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#:projection
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(λ (ctc)
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(λ (blame)
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(λ (val)
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(make-wrapper-object val blame
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(object-contract-methods ctc) (object-contract-method-ctcs ctc)
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(object-contract-fields ctc) (object-contract-field-ctcs ctc)))))
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#:name
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(λ (ctc) `(object-contract ,@(map (λ (fld ctc) (build-compound-type-name 'field fld ctc))
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(object-contract-fields ctc)
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(object-contract-field-ctcs ctc))
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,@(map (λ (mtd ctc) (build-compound-type-name mtd ctc))
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(object-contract-methods ctc)
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(object-contract-method-ctcs ctc))))
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#:first-order
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(λ (ctc)
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(λ (val)
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(check-object-contract val #f (object-contract-methods ctc) (object-contract-fields ctc))))))
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(define-syntax (object-contract stx)
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(syntax-case stx ()
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[(_ spec ...)
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(with-syntax ([(((method-id method-ctc) ...)
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((field-id field-ctc) ...))
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(parse-object-contract stx #'(spec ...))])
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(with-syntax ([(method-name ...) (map (λ (x) (string->symbol (format "~a method" (syntax-e x))))
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(syntax->list #'(method-id ...)))])
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#'(build-object-contract '(method-id ...)
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(syntax-parameterize ((making-a-method #t)) (list (let ([method-name method-ctc]) method-name) ...))
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'(field-id ...)
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(list field-ctc ...))))]))
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(define (build-object-contract methods method-ctcs fields field-ctcs)
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(make-object-contract methods
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(map (λ (x) (coerce-contract 'object-contract x)) method-ctcs)
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fields
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(map (λ (x) (coerce-contract 'object-contract x)) field-ctcs)))
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(define (make-mixin-contract . %/<%>s)
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(->d ([c% (and/c (flat-contract class?)
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(apply and/c (map sub/impl?/c %/<%>s)))])
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()
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[res (subclass?/c c%)]))
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(define (subclass?/c %)
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(unless (class? %)
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(error 'subclass?/c "expected <class>, given: ~e" %))
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(let ([name (object-name %)])
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(flat-named-contract
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`(subclass?/c ,(or name 'unknown%))
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(lambda (x) (subclass? x %)))))
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(define (implementation?/c <%>)
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(unless (interface? <%>)
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(error 'implementation?/c "expected <interface>, given: ~e" <%>))
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(let ([name (object-name <%>)])
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(flat-named-contract
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`(implementation?/c ,(or name 'unknown<%>))
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(lambda (x) (implementation? x <%>)))))
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(define (sub/impl?/c %/<%>)
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(cond
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[(interface? %/<%>) (implementation?/c %/<%>)]
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[(class? %/<%>) (subclass?/c %/<%>)]
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[else (error 'make-mixin-contract "unknown input ~e" %/<%>)]))
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(define (is-a?/c <%>)
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(unless (or (interface? <%>)
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(class? <%>))
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(error 'is-a?/c "expected <interface> or <class>, given: ~e" <%>))
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(let ([name (object-name <%>)])
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(flat-named-contract
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(cond
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[name
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`(is-a?/c ,name)]
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[(class? <%>)
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`(is-a?/c unknown%)]
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[else `(is-a?/c unknown<%>)])
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(lambda (x) (is-a? x <%>)))))
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(define mixin-contract (->d ([c% class?]) () [res (subclass?/c c%)]))
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