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087bb683c8
* module/ice-9/match.upstream.scm (match-next): Use throw, so that CPS can see that there's no fallthrough. * module/ice-9/match.scm: Add a note about what to do in 3.1 to remove the old "error" definition.
63 lines
2.2 KiB
Scheme
63 lines
2.2 KiB
Scheme
;;; -*- mode: scheme; coding: utf-8; -*-
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;;;
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;;; Copyright (C) 2010, 2011, 2012, 2020 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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(define-module (ice-9 match)
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#:export (match
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match-lambda
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match-lambda*
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match-let
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match-let*
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match-letrec))
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;; Support for record matching.
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;; For backwards compatibility with previously-compiled files, keep the
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;; old definition of "error" around.
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(define (error _ . args)
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(apply throw 'match-error "match" args))
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;; FIXME: In 3.1.x, use this new definition:
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;; (define-syntax-rule (error where msg datum)
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;; (throw 'match-error "match" msg datum))
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(define-syntax slot-ref
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(syntax-rules ()
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((_ rtd rec n)
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(struct-ref rec n))))
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(define-syntax slot-set!
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(syntax-rules ()
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((_ rtd rec n value)
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(struct-set! rec n value))))
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(define-syntax is-a?
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(syntax-rules ()
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((_ rec rtd)
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(and (struct? rec)
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(eq? (struct-vtable rec) rtd)))))
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;; Compared to Andrew K. Wright's `match', this one lacks `match-define',
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;; `match:error-control', `match:set-error-control', `match:error',
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;; `match:set-error', and all structure-related procedures. Also,
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;; `match' doesn't support clauses of the form `(pat => exp)'.
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;; Unmodified public domain code by Alex Shinn retrieved from
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;; the Chibi-Scheme repository, commit 1206:acd808700e91.
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;;
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;; Note: Make sure to update `match.test.upstream' when updating this
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;; file.
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(include-from-path "ice-9/match.upstream.scm")
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