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;;; hashtables.scm --- The R6RS hashtables library
;; Copyright (C) 2010 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 3 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
(library (rnrs hashtables (6))
(export make-eq-hashtable
make-eqv-hashtable
make-hashtable
hashtable?
hashtable-size
hashtable-ref
hashtable-set!
hashtable-delete!
hashtable-contains?
hashtable-update!
hashtable-copy
hashtable-clear!
hashtable-keys
hashtable-entries
hashtable-equivalence-function
hashtable-hash-function
hashtable-mutable?
equal-hash
string-hash
string-ci-hash
symbol-hash)
(import (rename (only (guile) string-hash-ci
string-hash
hashq
hashv
modulo
*unspecified*
@@)
(string-hash-ci string-ci-hash))
(only (ice-9 optargs) define*)
(rename (only (srfi :69) make-hash-table
hash
hash-by-identity
hash-table-size
hash-table-ref/default
hash-table-set!
hash-table-delete!
hash-table-exists?
hash-table-update!/default
hash-table-copy
hash-table-equivalence-function
hash-table-hash-function
hash-table-keys
hash-table-fold)
(hash equal-hash)
(hash-by-identity symbol-hash))
(rnrs base (6))
(rnrs records procedural (6)))
(define r6rs:hashtable
(make-record-type-descriptor
'r6rs:hashtable #f #f #t #t
'#((mutable wrapped-table)
(immutable orig-hash-function)
(immutable mutable)
(immutable type))))
(define hashtable? (record-predicate r6rs:hashtable))
(define make-r6rs-hashtable
(record-constructor (make-record-constructor-descriptor
r6rs:hashtable #f #f)))
(define r6rs:hashtable-wrapped-table (record-accessor r6rs:hashtable 0))
(define r6rs:hashtable-set-wrapped-table! (record-mutator r6rs:hashtable 0))
(define r6rs:hashtable-orig-hash-function (record-accessor r6rs:hashtable 1))
(define r6rs:hashtable-mutable? (record-accessor r6rs:hashtable 2))
(define r6rs:hashtable-type (record-accessor r6rs:hashtable 3))
(define hashtable-mutable? r6rs:hashtable-mutable?)
(define hash-by-value ((@@ (srfi srfi-69) caller-with-default-size) hashv))
(define (wrap-hash-function proc)
(lambda (key capacity) (modulo (proc key) capacity)))
(define* (make-eq-hashtable #:optional k)
(make-r6rs-hashtable
(if k (make-hash-table eq? hashq k) (make-hash-table eq? symbol-hash))
symbol-hash
#t
'eq))
(define* (make-eqv-hashtable #:optional k)
(make-r6rs-hashtable
(if k (make-hash-table eqv? hashv k) (make-hash-table eqv? hash-by-value))
hash-by-value
#t
'eqv))
(define* (make-hashtable hash-function equiv #:optional k)
(let ((wrapped-hash-function (wrap-hash-function hash-function)))
(make-r6rs-hashtable
(if k
(make-hash-table equiv wrapped-hash-function k)
(make-hash-table equiv wrapped-hash-function))
hash-function
#t
'custom)))
(define (hashtable-size hashtable)
(hash-table-size (r6rs:hashtable-wrapped-table hashtable)))
(define (hashtable-ref hashtable key default)
(hash-table-ref/default
(r6rs:hashtable-wrapped-table hashtable) key default))
(define (hashtable-set! hashtable key obj)
(if (r6rs:hashtable-mutable? hashtable)
(hash-table-set! (r6rs:hashtable-wrapped-table hashtable) key obj)
(assertion-violation
'hashtable-set! "Hashtable is immutable." hashtable)))
(define (hashtable-delete! hashtable key)
(if (r6rs:hashtable-mutable? hashtable)
(hash-table-delete! (r6rs:hashtable-wrapped-table hashtable) key))
*unspecified*)
(define (hashtable-contains? hashtable key)
(hash-table-exists? (r6rs:hashtable-wrapped-table hashtable) key))
(define (hashtable-update! hashtable key proc default)
(if (r6rs:hashtable-mutable? hashtable)
(hash-table-update!/default
(r6rs:hashtable-wrapped-table hashtable) key proc default))
*unspecified*)
(define* (hashtable-copy hashtable #:optional mutable)
(make-r6rs-hashtable
(hash-table-copy (r6rs:hashtable-wrapped-table hashtable))
(r6rs:hashtable-orig-hash-function hashtable)
(and mutable #t)
(r6rs:hashtable-type hashtable)))
(define* (hashtable-clear! hashtable #:optional k)
(if (r6rs:hashtable-mutable? hashtable)
(let* ((ht (r6rs:hashtable-wrapped-table hashtable))
(equiv (hash-table-equivalence-function ht))
(hash-function (r6rs:hashtable-orig-hash-function hashtable))
(wrapped-hash-function (wrap-hash-function hash-function)))
(r6rs:hashtable-set-wrapped-table!
hashtable
(if k
(make-hash-table equiv wrapped-hash-function k)
(make-hash-table equiv wrapped-hash-function)))))
*unspecified*)
(define (hashtable-keys hashtable)
(list->vector (hash-table-keys (r6rs:hashtable-wrapped-table hashtable))))
(define (hashtable-entries hashtable)
(let* ((ht (r6rs:hashtable-wrapped-table hashtable))
(size (hash-table-size ht))
(keys (make-vector size))
(vals (make-vector size)))
(hash-table-fold (r6rs:hashtable-wrapped-table hashtable)
(lambda (k v i)
(vector-set! keys i k)
(vector-set! vals i v)
(+ i 1))
0)
(values keys vals)))
(define (hashtable-equivalence-function hashtable)
(hash-table-equivalence-function (r6rs:hashtable-wrapped-table hashtable)))
(define (hashtable-hash-function hashtable)
(case (r6rs:hashtable-type hashtable)
((eq eqv) #f)
(else (r6rs:hashtable-orig-hash-function hashtable)))))
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