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; "hashtab.scm", hash tables for Scheme.
; Copyright (c) 1992, 1993 Aubrey Jaffer
;
;Permission to copy this software, to redistribute it, and to use it
;for any purpose is granted, subject to the following restrictions and
;understandings.
;
;1. Any copy made of this software must include this copyright notice
;in full.
;
;2. I have made no warrantee or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;
;3. In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.
(require 'hash)
(require 'alist)
(define (predicate->hash pred)
(cond ((eq? pred eq?) hashq)
((eq? pred eqv?) hashv)
((eq? pred equal?) hash)
((eq? pred =) hashv)
((eq? pred char=?) hashv)
((eq? pred char-ci=?) hashv)
((eq? pred string=?) hash)
((eq? pred string-ci=?) hash)
(else (slib:error "unknown predicate for hash" pred))))
(define (make-hash-table k) (make-vector k '()))
(define (predicate->hash-asso pred)
(let ((hashfun (predicate->hash pred))
(asso (predicate->asso pred)))
(lambda (key hashtab)
(asso key
(vector-ref hashtab (hashfun key (vector-length hashtab)))))))
(define (hash-inquirer pred)
(let ((hashfun (predicate->hash pred))
(ainq (alist-inquirer pred)))
(lambda (hashtab key)
(ainq (vector-ref hashtab (hashfun key (vector-length hashtab)))
key))))
(define (hash-associator pred)
(let ((hashfun (predicate->hash pred))
(asso (alist-associator pred)))
(lambda (hashtab key val)
(let* ((num (hashfun key (vector-length hashtab))))
(vector-set! hashtab num
(asso (vector-ref hashtab num) key val)))
hashtab)))
(define (hash-remover pred)
(let ((hashfun (predicate->hash pred))
(arem (alist-remover pred)))
(lambda (hashtab key)
(let* ((num (hashfun key (vector-length hashtab))))
(vector-set! hashtab num
(arem (vector-ref hashtab num) key)))
hashtab)))
(define (hash-map proc ht)
(define nht (make-vector (vector-length ht)))
(do ((i (+ -1 (vector-length ht)) (+ -1 i)))
((negative? i) nht)
(vector-set!
nht i
(alist-map proc (vector-ref ht i)))))
(define (hash-for-each proc ht)
(do ((i (+ -1 (vector-length ht)) (+ -1 i)))
((negative? i))
(alist-for-each proc (vector-ref ht i))))
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