Mac Easy 2010 May/Mac Life Ubuntu.iso/casper/filesystem.squashfs/usr/share/guile/1.8/ice-9/mapping.scm

Text File | 2008-12-17 | 5.0 KB | 129 lines

;;; installed-scm-file

;;;;     Copyright (C) 1996, 2001, 2006 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 2.1 of the License, or (at your option) any later version.
;;;;
;;;; This library is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;;;



(define-module (ice-9 mapping)
  :use-module (ice-9 poe)
  :export (mapping-hooks-type make-mapping-hooks mapping-hooks?
       mapping-hooks-get-handle mapping-hooks-create-handle
       mapping-hooks-remove mapping-type make-mapping mapping?
       mapping-hooks mapping-data set-mapping-hooks! set-mapping-data!
       mapping-get-handle mapping-create-handle! mapping-remove!
       mapping-ref mapping-set!  hash-table-mapping-hooks
       make-hash-table-mapping hash-table-mapping))

(define mapping-hooks-type (make-record-type 'mapping-hooks '(get-handle
                                  create-handle
                                  remove)))


(define make-mapping-hooks (perfect-funcq 17 (record-constructor mapping-hooks-type)))
(define mapping-hooks? (record-predicate mapping-hooks-type))
(define mapping-hooks-get-handle (record-accessor mapping-hooks-type 'get-handle))
(define mapping-hooks-create-handle (record-accessor mapping-hooks-type 'create-handle))
(define mapping-hooks-remove (record-accessor mapping-hooks-type 'remove))

(define mapping-type (make-record-type 'mapping '(hooks data)))
(define make-mapping (record-constructor mapping-type))
(define mapping? (record-predicate mapping-type))
(define mapping-hooks (record-accessor mapping-type 'hooks))
(define mapping-data (record-accessor mapping-type 'data))
(define set-mapping-hooks! (record-modifier mapping-type 'hooks))
(define set-mapping-data! (record-modifier mapping-type 'data))

(define (mapping-get-handle map key)
  ((mapping-hooks-get-handle (mapping-hooks map)) map key))
(define (mapping-create-handle! map key . opts)
  (apply (mapping-hooks-create-handle (mapping-hooks map)) map key opts))
(define (mapping-remove! map key)
  ((mapping-hooks-remove (mapping-hooks map)) map key))

(define (mapping-ref map key . dflt)
  (cond
   ((mapping-get-handle map key)    => cdr)
   (dflt                => car)
   (else                #f)))

(define (mapping-set! map key val)
  (set-cdr! (mapping-create-handle! map key #f) val))



(define hash-table-mapping-hooks
  (let ((wrap (lambda (proc) (lambda (1st . rest) (apply proc (mapping-data 1st) rest)))))

    (perfect-funcq 17
           (lambda (hash-proc assoc-proc delete-proc)
             (let ((procs (list hash-proc assoc-proc delete-proc)))
               (cond
            ((equal? procs `(,hashq ,assq ,delq!))
             (make-mapping-hooks (wrap hashq-get-handle)
                         (wrap hashq-create-handle!)
                         (wrap hashq-remove!)))
            ((equal? procs `(,hashv ,assv ,delv!))
             (make-mapping-hooks (wrap hashv-get-handle)
                         (wrap hashv-create-handle!)
                         (wrap hashv-remove!)))
            ((equal? procs `(,hash ,assoc ,delete!))
             (make-mapping-hooks (wrap hash-get-handle)
                         (wrap hash-create-handle!)
                         (wrap hash-remove!)))
            (else
             (make-mapping-hooks (wrap
                          (lambda (table key)
                        (hashx-get-handle hash-proc assoc-proc table key)))
                         (wrap
                          (lambda (table key)
                        (hashx-create-handle hash-proc assoc-proc table key)))
                         (wrap
                          (lambda (table key)
                        (hashx-get-handle hash-proc assoc-proc delete-proc table key)))))))))))

(define (make-hash-table-mapping table hash-proc assoc-proc delete-proc)
  (make-mapping (hash-table-mapping-hooks hash-proc assoc-proc delete-proc) table))

(define (hash-table-mapping . options)
  (let* ((size (or (and options (number? (car options)) (car options))
           71))
     (hash-proc (or (kw-arg-ref options #:hash-proc) hash))
     (assoc-proc (or (kw-arg-ref options #:assoc-proc)
             (cond
              ((eq? hash-proc hash) assoc)
              ((eq? hash-proc hashv) assv)
              ((eq? hash-proc hashq) assq)
              (else (error 'hash-table-mapping
                       "Hash-procedure specified with no known assoc function."
                       hash-proc)))))
     (delete-proc (or (kw-arg-ref options #:delete-proc)
              (cond
               ((eq? hash-proc hash) delete!)
               ((eq? hash-proc hashv) delv!)
               ((eq? hash-proc hashq) delq!)
               (else (error 'hash-table-mapping
                    "Hash-procedure specified with no known delete function."
                    hash-proc)))))
     (table-constructor (or (kw-arg-ref options #:table-constructor)
                (lambda (len) (make-vector len '())))))
    (make-hash-table-mapping (table-constructor size)
                 hash-proc
                 assoc-proc
                 delete-proc)))