382 lines
14 KiB
Scheme
382 lines
14 KiB
Scheme
#lang scheme/base
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(require syntax/stx
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(for-syntax scheme/base)
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(for-template scheme/base "class-events.ss"))
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(define-values (struct:s!t make-s!t s!t? s!t-ref s!t-set!)
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(make-struct-type 'set!-transformer #f 2 0 #f null (current-inspector) 0))
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(define (mk-set!-trans old-id proc)
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(make-set!-transformer (make-s!t proc old-id)))
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(define (make-method-apply id this orig-args)
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(let loop ([args orig-args][accum null])
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(cond
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[(stx-null? args)
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(list* id this orig-args)]
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[(stx-pair? args)
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(loop (stx-cdr args) (cons (stx-car args) accum))]
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[else
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(list* 'apply id this (reverse (cons args accum)))])))
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(define (find the-finder name src)
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(let ([this-id (syntax-local-value (syntax-local-get-shadower the-finder))])
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(datum->syntax this-id name src)))
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;; Check Syntax binding info:
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(define (binding from to stx)
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stx)
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(define (make-this-map orig-id the-finder the-obj)
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(let ([set!-stx (datum->syntax the-finder 'set!)])
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(mk-set!-trans
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orig-id
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(lambda (stx)
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(syntax-case stx ()
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[(set! id expr)
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(free-identifier=? (syntax set!) set!-stx)
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(raise-syntax-error 'class "cannot mutate object identifier" stx)]
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[(id . args)
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(datum->syntax
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stx
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(cons (find the-finder the-obj stx) (syntax args))
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stx)]
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[id (find the-finder the-obj stx)])))))
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(define (make-this%-map replace-stx the-finder)
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(let ([set!-stx (datum->syntax the-finder 'set!)])
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(make-set!-transformer
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(λ (stx)
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(syntax-case stx ()
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[(set! id expr)
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(free-identifier=? #'set! set!-stx)
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(raise-syntax-error 'class "cannot mutate this% identifier" stx)]
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[id
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(identifier? #'id)
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(quasisyntax/loc stx #,replace-stx)]
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[(f . args)
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(quasisyntax/loc stx (#,replace-stx . args))])))))
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(define (make-field-map trace-flag the-finder the-obj the-binder the-binder-localized
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field-accessor field-mutator field-pos/null)
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(let ([set!-stx (datum->syntax the-finder 'set!)])
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(mk-set!-trans
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the-binder-localized
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(lambda (stx)
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(with-syntax ([obj-expr (find the-finder the-obj stx)])
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(syntax-case stx ()
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[(set! id expr)
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(free-identifier=? (syntax set!) set!-stx)
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(with-syntax ([bindings (syntax/loc stx ([obj obj-expr] [id expr]))]
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[trace (syntax/loc stx (set-event obj (quote id) id))]
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[set (quasisyntax/loc stx
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((unsyntax field-mutator)
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obj (unsyntax-splicing field-pos/null) id))])
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(if trace-flag
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(syntax/loc stx (let* bindings trace set))
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(syntax/loc stx (let* bindings set))))]
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[(id . args)
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(with-syntax ([bindings (syntax/loc stx ([obj obj-expr]))]
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[trace (syntax/loc stx (get-event obj (quote id)))]
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[call (quasisyntax/loc stx
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(((unsyntax field-accessor)
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obj-expr (unsyntax-splicing field-pos/null)) . args))])
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(if trace-flag
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(syntax/loc stx (let* bindings trace call))
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(syntax/loc stx (let* bindings call))))]
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[id
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(with-syntax ([bindings (syntax/loc stx ([obj obj-expr]))]
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[trace (syntax/loc stx (get-event obj (quote id)))]
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[get (quasisyntax/loc stx
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((unsyntax field-accessor)
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obj-expr (unsyntax-splicing field-pos/null)))])
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(if trace-flag
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(syntax/loc stx (let* bindings trace get))
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(syntax/loc stx (let* bindings get))))]))))))
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(define (make-method-map the-finder the-obj the-binder the-binder-localized method-accessor)
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(let ([set!-stx (datum->syntax the-finder 'set!)])
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(mk-set!-trans
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the-binder-localized
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(lambda (stx)
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(syntax-case stx ()
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[(set! id expr)
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(free-identifier=? (syntax set!) set!-stx)
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(raise-syntax-error 'class "cannot mutate method" stx)]
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[(id . args)
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(binding
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the-binder (syntax id)
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(datum->syntax
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the-finder
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(make-method-apply
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(list method-accessor (find the-finder the-obj stx))
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(find the-finder the-obj stx)
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(syntax args))
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stx))]
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[_else
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(raise-syntax-error
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'class
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"misuse of method (not in application)"
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stx)])))))
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;; For methods that are dirrectly available via their names
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;; (e.g., private methods)
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(define (make-direct-method-map the-finder the-obj the-binder the-binder-localized new-name)
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(let ([set!-stx (datum->syntax the-finder 'set!)])
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(mk-set!-trans
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the-binder-localized
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(lambda (stx)
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(syntax-case stx ()
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[(set! id expr)
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(free-identifier=? (syntax set!) set!-stx)
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(raise-syntax-error 'class "cannot mutate method" stx)]
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[(id . args)
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(binding
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the-binder (syntax id)
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(datum->syntax
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the-finder
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(make-method-apply (find the-finder new-name stx) (find the-finder the-obj stx) (syntax args))
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stx))]
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[_else
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(raise-syntax-error
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'class
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"misuse of method (not in application)"
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stx)])))))
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(define (make-rename-super-map the-finder the-obj the-binder the-binder-localized rename-temp)
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(let ([set!-stx (datum->syntax the-finder 'set!)])
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(mk-set!-trans
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the-binder-localized
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(lambda (stx)
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(syntax-case stx ()
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[(set! id expr)
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(free-identifier=? (syntax set!) set!-stx)
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(raise-syntax-error 'class "cannot mutate super method" stx)]
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[(id . args)
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(binding
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the-binder (syntax id)
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(datum->syntax
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the-finder
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(make-method-apply (find the-finder rename-temp stx) (find the-finder the-obj stx) (syntax args))
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stx))]
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[_else
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(raise-syntax-error
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'class
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"misuse of super method (not in application)"
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stx)])))))
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(define (make-rename-inner-map the-finder the-obj the-binder the-binder-localized rename-temp)
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(let ([set!-stx (datum->syntax the-finder 'set!)]
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[lambda-stx (datum->syntax the-finder 'lambda)])
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(mk-set!-trans
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the-binder-localized
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(lambda (stx)
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(syntax-case stx ()
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[(set! id expr)
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(free-identifier=? (syntax set!) set!-stx)
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(raise-syntax-error 'class "cannot mutate inner method" stx)]
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[(id (lambda () default) . args)
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(free-identifier=? (syntax lambda) lambda-stx)
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(let ([target (find the-finder the-obj stx)])
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(binding
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the-binder (syntax id)
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(datum->syntax
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the-finder
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(make-method-apply (list (find the-finder rename-temp stx) target #'default)
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target (syntax args))
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stx)))]
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[(id (lambda largs default) . args)
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(free-identifier=? (syntax lambda) lambda-stx)
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(raise-syntax-error
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'class
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"misuse of inner method (lambda for default does not take zero arguments)"
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stx)]
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[(id (lambda . rest) . args)
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(free-identifier=? (syntax lambda) lambda-stx)
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(raise-syntax-error
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'class
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"misuse of inner method (ill-formed lambda for default)"
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stx)]
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[(id . args)
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(raise-syntax-error
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'class
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"misuse of inner method (no lambda-wrapped default after name)"
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stx)]
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[_else
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(raise-syntax-error
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'class
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"misuse of inner method (not in application)"
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stx)])))))
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(define (generate-super-call stx the-finder the-obj rename-temp args)
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(datum->syntax
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the-finder
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(make-method-apply (find the-finder rename-temp stx)
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(find the-finder the-obj stx)
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args)
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stx))
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(define (generate-inner-call stx the-finder the-obj default-expr rename-temp args)
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(datum->syntax
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the-finder
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(let ([target (find the-finder the-obj stx)])
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(datum->syntax
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the-finder
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`(let ([i (,(find the-finder rename-temp stx) ,target)])
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(if i
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,(make-method-apply 'i target args)
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,default-expr))
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stx))
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stx))
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(define (make-init-error-map localized-id)
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(mk-set!-trans
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localized-id
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(lambda (stx)
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(raise-syntax-error
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'class
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"cannot use non-field init variable in a method"
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stx))))
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(define (make-init-redirect set!-stx #%app-stx local-id localized-id)
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(mk-set!-trans
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localized-id
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(lambda (stx)
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(syntax-case stx ()
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[(set! id expr)
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(free-identifier=? (syntax set!) set!-stx)
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(with-syntax ([local-id local-id])
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(syntax/loc stx (set! local-id expr)))]
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[(id . args)
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(with-syntax ([local-id local-id]
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[#%app #%app-stx])
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(syntax/loc stx (#%app local-id . args)))]
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[_else (datum->syntax
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local-id
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(syntax-e local-id)
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stx
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stx)]))))
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(define super-error-map
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(lambda (stx)
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(raise-syntax-error
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'class
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"cannot use superclass initialization form in a method"
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stx)))
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(define (make-with-method-map trace-flag set!-stx id-stx
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method-stx method-obj-stx unwrap-stx)
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(make-set!-transformer
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(lambda (stx)
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(syntax-case stx ()
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[(set! id expr)
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(and (identifier? (syntax id))
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(free-identifier=? (syntax set!) set!-stx))
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(raise-syntax-error 'with-method "cannot mutate method" stx)]
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[(id . args)
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(identifier? (syntax id))
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(let* ([args-stx (syntax args)]
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[proper? (stx-list? args-stx)]
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[flat-args-stx (if proper? args-stx (flatten-args args-stx))])
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(make-method-call
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trace-flag
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stx
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method-obj-stx
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unwrap-stx
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method-stx
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(syntax (quote id))
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flat-args-stx
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(not proper?)))]
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[id
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(identifier? (syntax id))
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(raise-syntax-error
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'with-method
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"misuse of method (not in application)"
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stx)]))))
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(define (flatten-args orig-args)
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(let loop ([args orig-args][accum null])
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(cond
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[(stx-null? args) orig-args]
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[(stx-pair? args)
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(loop (stx-cdr args) (cons (stx-car args) accum))]
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[else
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(reverse (cons args accum))])))
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(define-struct private-name (orig-id gen-id)
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#:property prop:procedure (lambda (self stx)
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(if (not (eq? (syntax-local-context) 'expression))
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#`(#%expression #,stx)
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(raise-syntax-error
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#f
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"unbound local member name"
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stx))))
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(define (do-localize orig-id validate-local-member-stx)
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(let loop ([id orig-id])
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(let ([v (syntax-local-value id (lambda () #f))])
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(cond
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[(and v (private-name? v))
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(list 'unquote
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(list validate-local-member-stx
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(list 'quote orig-id)
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(binding (private-name-orig-id v)
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id
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(private-name-gen-id v))))]
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[(and (set!-transformer? v)
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(s!t? (set!-transformer-procedure v)))
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(s!t-ref (set!-transformer-procedure v) 1)]
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[else orig-id]))))
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(define-struct class-context ())
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(define (generate-class-expand-context)
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(let ([c (syntax-local-context)]
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[v (make-class-context)])
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(if (pair? c)
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(cons v c)
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(list v))))
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(define (class-top-level-context? ctx)
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(and (pair? ctx)
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(class-context? (car ctx))))
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(define (make-method-call traced? source-stx object-stx unwrap-stx
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method-proc-stx method-name-stx args-stx rest-arg?)
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(define-syntax (qstx stx)
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(syntax-case stx ()
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[(form body) (syntax/loc stx (quasisyntax/loc source-stx body))]))
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(with-syntax ([object object-stx]
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[method method-proc-stx]
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[app (if rest-arg? (qstx apply) (qstx #%app))]
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[args args-stx])
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(if traced?
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(with-syntax ([(mth obj) (generate-temporaries
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(list object-stx method-proc-stx))]
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[unwrap unwrap-stx]
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[name method-name-stx]
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[(arg ...) (qstx args)]
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[(var ...) (generate-temporaries (qstx args))])
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(qstx (let ([mth method]
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[obj object]
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[var arg] ...)
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(initialize-call-event
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(unwrap obj) name (app list var ...))
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(call-with-values (lambda () (app mth obj var ...))
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finalize-call-event))))
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(qstx (app method object . args)))))
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(provide (protect-out make-this-map make-this%-map make-field-map make-method-map
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make-direct-method-map
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make-rename-super-map make-rename-inner-map
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make-init-error-map make-init-redirect super-error-map
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make-with-method-map
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flatten-args make-method-call
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do-localize make-private-name
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generate-super-call generate-inner-call
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generate-class-expand-context class-top-level-context?))
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