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Add procedures to convert alists into hash tables.

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* module/ice-9/hash-table.scm: New module.

* test-suite/tests/hash.test ("alist conversion"): Add tests.

* doc/ref/api-compound.texi (Hash Table Reference): Add docs.
This commit is contained in:
David Thompson 2013-10-19 22:43:37 -04:00 • committed by Mark H Weaver
parent 02500d4477
commit 5063f0a93b
4 changed files with 104 additions and 1 deletions
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module/ice-9/hash-table.scm Normal file
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;;;; hash-table.scm --- Additional hash table procedures
;;;; Copyright (C) 2013 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
;;;;
(define-module (ice-9 hash-table)
#:export (alist->hash-table
alist->hashq-table
alist->hashv-table
alist->hashx-table))
(define-syntax-rule (define-alist-converter name hash-set-proc)
(define (name alist)
"Convert ALIST into a hash table."
(let ((table (make-hash-table)))
(for-each (lambda (pair)
(hash-set-proc table (car pair) (cdr pair)))
(reverse alist))
table)))
(define-alist-converter alist->hash-table hash-set!)
(define-alist-converter alist->hashq-table hashq-set!)
(define-alist-converter alist->hashv-table hashv-set!)
(define (alist->hashx-table hash assoc alist)
"Convert ALIST into a hash table with custom HASH and ASSOC
procedures."
(let ((table (make-hash-table)))
(for-each (lambda (pair)
(hashx-set! hash assoc table (car pair) (cdr pair)))
(reverse alist))
table))