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