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;;;; -*- scheme -*-
;;;; continuations.test --- test suite for continutations
;;;;
;;;; Copyright (C) 2003, 2006, 2009, 2011 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 (test-suite test-continuations)
:use-module (test-suite lib))
(define (block-reentry body)
(let ((active #f))
(dynamic-wind
(lambda ()
(if active
(throw 'no-reentry)))
(lambda ()
(set! active #t)
(body))
(lambda () #f))))
(define (catch-tag body)
(catch #t
body
(lambda (tag . args) tag)))
(define (check-cont)
(catch-tag
(lambda ()
(block-reentry (lambda () (call/cc identity))))))
(define (dont-crash-please)
(let ((k (check-cont)))
(if (procedure? k)
(k 12)
k)))
(with-test-prefix "continuations"
(pass-if "throwing to a rewound catch context"
(eq? (dont-crash-please) 'no-reentry))
(pass-if "can print a continuation"
(let ((s (with-output-to-string
(lambda ()
(call-with-current-continuation write)))))
(string=? "#<continuation " (substring s 0 15))))
(pass-if "blocked attempt to cross a continuation barrier"
(call-with-current-continuation
(lambda (k)
(with-continuation-barrier
(lambda ()
(catch 'misc-error
(lambda ()
(k 1)
#f)
(lambda _
#t)))))))
(pass-if "uncaught exception is handled by continuation barrier"
(let* ((handled #f)
(s (with-error-to-string
(lambda ()
(set! handled
(not (with-continuation-barrier
(lambda ()
(error "Catch me if you can!")))))))))
handled))
(pass-if "exit unwinds dynwinds inside a continuation barrier"
(let ((s (with-error-to-string
(lambda ()
(with-continuation-barrier
(lambda ()
(dynamic-wind
(lambda () #f)
(lambda () (exit 1))
(lambda () (throw 'abcde)))))))))
(and (string-contains s "abcde") #t)))
(with-debugging-evaluator
(pass-if "make a stack from a continuation"
(stack? (call-with-current-continuation make-stack)))
(pass-if "get a continuation's stack ID"
(let ((id (call-with-current-continuation stack-id)))
(or (boolean? id) (symbol? id)))))
)
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