--- /dev/null
+;;; 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
+;;;;
+
+\f
+
+(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))
+
+\f
+
+(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)))
+
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