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5063f0a93b
* 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.
45 lines
1.8 KiB
Scheme
45 lines
1.8 KiB
Scheme
;;;; hash-table.scm --- Additional hash table procedures
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;;;; Copyright (C) 2013 Free Software Foundation, Inc.
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;;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 3 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;;;
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(define-module (ice-9 hash-table)
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#:export (alist->hash-table
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alist->hashq-table
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alist->hashv-table
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alist->hashx-table))
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(define-syntax-rule (define-alist-converter name hash-set-proc)
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(define (name alist)
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"Convert ALIST into a hash table."
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(let ((table (make-hash-table)))
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(for-each (lambda (pair)
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(hash-set-proc table (car pair) (cdr pair)))
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(reverse alist))
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table)))
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(define-alist-converter alist->hash-table hash-set!)
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(define-alist-converter alist->hashq-table hashq-set!)
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(define-alist-converter alist->hashv-table hashv-set!)
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(define (alist->hashx-table hash assoc alist)
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"Convert ALIST into a hash table with custom HASH and ASSOC
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procedures."
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(let ((table (make-hash-table)))
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(for-each (lambda (pair)
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(hashx-set! hash assoc table (car pair) (cdr pair)))
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(reverse alist))
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table))
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