\f
(library (rnrs exceptions (6))
- (export with-exception-handler raise raise-continuable)
+ (export guard with-exception-handler raise raise-continuable)
(import (rnrs base (6))
(rnrs conditions (6))
(rnrs records procedural (6))
+ (rnrs syntax-case (6))
(only (guile) with-throw-handler))
(define raise (@@ (rnrs records procedural) r6rs-raise))
(continuation handler-return)
(raise (make-non-continuable-violation))))
*unspecified*))))
+
+ (define-syntax guard0
+ (lambda (stx)
+ (syntax-case stx ()
+ ((_ (variable cond-clause ...) body)
+ (syntax (call/cc (lambda (continuation)
+ (with-exception-handler
+ (lambda (variable)
+ (continuation (cond cond-clause ...)))
+ (lambda () body)))))))))
+
+ (define-syntax guard
+ (lambda (stx)
+ (syntax-case stx (else)
+ ((_ (variable cond-clause ... . ((else else-clause ...))) body)
+ (syntax (guard0 (variable cond-clause ... (else else-clause ...))
+ body)))
+ ((_ (variable cond-clause ...) body)
+ (syntax (guard0 (variable cond-clause ... (else (raise variable)))
+ body))))))
)
--- /dev/null
+;;; r6rs-exceptions.test --- Test suite for R6RS (rnrs exceptions)
+
+;; Copyright (C) 2010 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
+\f
+
+(define-module (test-suite test-rnrs-exceptions)
+ :use-module ((rnrs conditions) :version (6))
+ :use-module ((rnrs exceptions) :version (6))
+ :use-module (test-suite lib))
+
+(with-test-prefix "with-exception-handler"
+ (pass-if "handler invoked on raise"
+ (let ((success #f))
+ (call/cc
+ (lambda (continuation)
+ (with-exception-handler
+ (lambda (condition) (set! success #t) (continuation))
+ (lambda () (raise (make-violation))))))
+ success))
+
+ (pass-if "handler not invoked unless raise"
+ (let ((success #f))
+ (call/cc
+ (lambda (continuation)
+ (with-exception-handler
+ (lambda (condition) (continuation))
+ (lambda () (set! success #t)))))
+ success)))
+
+(with-test-prefix "raise"
+ (pass-if "raise causes &non-continuable after handler"
+ (let ((success #f))
+ (call/cc
+ (lambda (continuation)
+ (with-exception-handler
+ (lambda (condition)
+ (set! success (non-continuable-violation? condition))
+ (continuation))
+ (lambda ()
+ (with-exception-handler
+ (lambda (condition) #f)
+ (lambda () (raise (make-violation))))))))
+ success)))
+
+(with-test-prefix "raise-continuable"
+ (pass-if "raise-continuable invokes continuation after handler"
+ (let ((handled #f)
+ (continued #f))
+ (call/cc
+ (lambda (continuation)
+ (with-exception-handler
+ (lambda (condition) (set! handled #t))
+ (lambda ()
+ (raise-continuable (make-violation))
+ (set! continued #t)))))
+ (and handled continued))))
+
+(with-test-prefix "guard"
+ (pass-if "guard with matching cond without else"
+ (let ((success #f))
+ (guard (condition ((error? condition) (set! success #t)))
+ (raise (make-error)))
+ success))
+
+ (pass-if "guard without matching cond without else"
+ (let ((success #f))
+ (call/cc
+ (lambda (continuation)
+ (with-exception-handler
+ (lambda (condition) (set! success (error? condition)) (continuation))
+ (lambda ()
+ (guard (condition ((irritants-condition? condition) #f))
+ (raise (make-error)))))))
+ success))
+
+ (pass-if "guard with else and without matching cond"
+ (let ((success #f))
+ (guard (condition ((irritants-condition? condition) #f)
+ (else (set! success #t)))
+ (raise (make-error)))
+ success))
+
+ (pass-if "guard with cond => syntax"
+ (guard (condition (condition => error?)) (raise (make-error)))))