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(define mapping-dto
(let ()
(define (prep-dto-arg proc)
(lambda (dto . args)
(apply proc args)))
(define (mapping-map* dto proc dict)
(mapping-map (lambda (key value)
(values key (proc key value)))
(dict-comparator dto dict) dict))
(define (mapping-find-update* dto dict key failure success)
(call/cc
;; escape from whole hashmap-search entirely, when success / failure
;; return something other than through passed in continuation procedures
(lambda (k)
(define-values
(new-dict ignored)
(mapping-search dict key
(lambda (insert ignore)
;; handle when continuation procedure is called
;; and force it into tail call
(call/cc (lambda (k2)
(define result
;; calls to insert / ignore / update / remove
;; can return unspecified amount of values,
;; hence call-with-values approach
(failure (lambda (value) (call-with-values (lambda () (insert value #f)) k2))
(lambda () (call-with-values (lambda () (ignore #f)) k2))))
;; neither insert nor ignore called -- return result to top level escape
(k result))))
(lambda (key value update remove)
(call/cc (lambda (k2)
(define result
(success
key
value
(lambda (new-key new-value) (call-with-values (lambda () (update new-key new-value #f)) k2))
(lambda () (call-with-values (lambda () (remove #f)) k2))))
(k result))))))
new-dict)))
(make-dto
dictionary?-id (prep-dto-arg mapping?)
dict-pure?-id (lambda _ #t)
dict-map-id mapping-map*
dict-empty?-id (prep-dto-arg mapping-empty?)
dict-contains?-id (prep-dto-arg mapping-contains?)
dict-ref-id (prep-dto-arg mapping-ref)
dict-ref/default-id (prep-dto-arg mapping-ref/default)
dict-set-id (prep-dto-arg mapping-set)
dict-adjoin-id (prep-dto-arg mapping-adjoin)
dict-delete-id (prep-dto-arg mapping-delete)
dict-delete-all-id (prep-dto-arg mapping-delete-all)
dict-replace-id (prep-dto-arg mapping-replace)
dict-intern-id (prep-dto-arg mapping-intern)
dict-update-id (prep-dto-arg mapping-update)
dict-update/default-id (prep-dto-arg mapping-update/default)
dict-pop-id (prep-dto-arg mapping-pop)
dict-filter-id (prep-dto-arg mapping-filter)
dict-remove-id (prep-dto-arg mapping-remove)
dict-find-update-id mapping-find-update*
dict-size-id (prep-dto-arg mapping-size)
dict-count-id (prep-dto-arg mapping-count)
dict-keys-id (prep-dto-arg mapping-keys)
dict-values-id (prep-dto-arg mapping-values)
dict-entries-id (prep-dto-arg mapping-entries)
dict-fold-id (prep-dto-arg mapping-fold)
dict-map->list-id (prep-dto-arg mapping-map->list)
dict->alist-id (prep-dto-arg mapping->alist)
dict-comparator-id (prep-dto-arg mapping-key-comparator))))
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