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04/11/2020 07:13:11 AM
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and-let-star.scm
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binary-ports.scm
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boot-9.scm
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buffered-input.scm
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calling.scm
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channel.scm
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command-line.scm
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common-list.scm
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control.scm
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curried-definitions.scm
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debug.scm
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deprecated.scm
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documentation.scm
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eval-string.scm
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eval.scm
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expect.scm
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format.scm
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ftw.scm
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futures.scm
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gap-buffer.scm
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getopt-long.scm
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hash-table.scm
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hcons.scm
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history.scm
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i18n.scm
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iconv.scm
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lineio.scm
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list.scm
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local-eval.scm
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ls.scm
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mapping.scm
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match.scm
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match.upstream.scm
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networking.scm
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null.scm
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occam-channel.scm
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optargs.scm
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poe.scm
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poll.scm
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popen.scm
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posix.scm
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pretty-print.scm
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psyntax-pp.scm
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psyntax.scm
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q.scm
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quasisyntax.scm
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r4rs.scm
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r5rs.scm
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r6rs-libraries.scm
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rdelim.scm
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readline.scm
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receive.scm
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regex.scm
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runq.scm
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rw.scm
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safe-r5rs.scm
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safe.scm
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save-stack.scm
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scm-style-repl.scm
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serialize.scm
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session.scm
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slib.scm
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stack-catch.scm
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streams.scm
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string-fun.scm
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syncase.scm
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threads.scm
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time.scm
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top-repl.scm
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unicode.scm
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vlist.scm
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weak-vector.scm
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Editing: control.scm
Close
;;; Beyond call/cc ;; Copyright (C) 2010, 2011, 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 ;;; Code: (define-module (ice-9 control) #:re-export (call-with-prompt abort-to-prompt default-prompt-tag make-prompt-tag) #:export (% abort shift reset shift* reset* call-with-escape-continuation call/ec let-escape-continuation let/ec)) (define (abort . args) (apply abort-to-prompt (default-prompt-tag) args)) (define-syntax % (syntax-rules () ((_ expr) (call-with-prompt (default-prompt-tag) (lambda () expr) default-prompt-handler)) ((_ expr handler) (call-with-prompt (default-prompt-tag) (lambda () expr) handler)) ((_ tag expr handler) (call-with-prompt tag (lambda () expr) handler)))) ;; Each prompt tag has a type -- an expected set of arguments, and an unwritten ;; contract of what its handler will do on an abort. In the case of the default ;; prompt tag, we could choose to return values, exit nonlocally, or punt to the ;; user. ;; ;; We choose the latter, by requiring that the user return one value, a ;; procedure, to an abort to the prompt tag. That argument is then invoked with ;; the continuation as an argument, within a reinstated default prompt. In this ;; way the return value(s) from a default prompt are under the user's control. (define (default-prompt-handler k proc) (% (default-prompt-tag) (proc k) default-prompt-handler)) ;; Kindly provided by Wolfgang J Moeller <wjm@heenes.com>, modelled ;; after the ones by Oleg Kiselyov in ;; http://okmij.org/ftp/Scheme/delim-control-n.scm, which are in the ;; public domain, as noted at the top of http://okmij.org/ftp/. ;; (define-syntax-rule (reset . body) (call-with-prompt (default-prompt-tag) (lambda () . body) (lambda (cont f) (f cont)))) (define-syntax-rule (shift var . body) (abort-to-prompt (default-prompt-tag) (lambda (cont) ((lambda (var) (reset . body)) (lambda vals (reset (apply cont vals))))))) (define (reset* thunk) (reset (thunk))) (define (shift* fc) (shift c (fc c))) (define (call-with-escape-continuation proc) "Call PROC with an escape continuation." (let ((tag (list 'call/ec))) (call-with-prompt tag (lambda () (proc (lambda args (apply abort-to-prompt tag args)))) (lambda (_ . args) (apply values args))))) (define call/ec call-with-escape-continuation) (define-syntax-rule (let-escape-continuation k body ...) "Bind K to an escape continuation within the lexical extent of BODY." (let ((tag (list 'let/ec))) (call-with-prompt tag (lambda () (let ((k (lambda args (apply abort-to-prompt tag args)))) body ...)) (lambda (_ . results) (apply values results))))) (define-syntax-rule (let/ec k body ...) (let-escape-continuation k body ...))