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;;;; structs.test --- Test suite for Guile's structures. -*- Scheme -*-
;;;; Ludovic Courtès <ludovic.courtes@laas.fr>, 2006-06-12.
;;;;
;;;; Copyright (C) 2006, 2007, 2009 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-structs)
:use-module (test-suite lib))
;;;
;;; Struct example taken from the reference manual (by Tom Lord).
;;;
(define ball-root (make-vtable-vtable "pr" 0))
(define (make-ball-type ball-color)
(make-struct ball-root 0
(make-struct-layout "pw")
(lambda (ball port)
(format port "#<a ~A ball owned by ~A>"
(color ball)
(owner ball)))
ball-color))
(define (color ball) (struct-ref (struct-vtable ball) vtable-offset-user))
(define (owner ball) (struct-ref ball 0))
(define (set-owner! ball owner) (struct-set! ball 0 owner))
(define red (make-ball-type 'red))
(define green (make-ball-type 'green))
(define (make-ball type owner) (make-struct type 0 owner))
;;;
;;; Test suite.
;;;
(with-test-prefix "low-level struct procedures"
(pass-if "constructors"
(and (struct-vtable? ball-root)
(struct-vtable? red)
(struct-vtable? green)))
(pass-if "vtables"
(and (eq? (struct-vtable red) ball-root)
(eq? (struct-vtable green) ball-root)
(eq? (struct-vtable (make-ball red "Bob")) red)
;; end of the vtable tower
(eq? (struct-vtable ball-root) ball-root)))
(pass-if-exception "write-access denied"
exception:struct-set!-denied
;; The first field of instances of BALL-ROOT is read-only.
(struct-set! red vtable-offset-user "blue"))
(pass-if "write-access granted"
(set-owner! (make-ball red "Bob") "Fred")
#t)
(pass-if "struct-set!"
(let ((ball (make-ball green "Bob")))
(set-owner! ball "Bill")
(string=? (owner ball) "Bill"))))
(with-test-prefix "equal?"
(pass-if "simple structs"
(let* ((vtable (make-vtable "pr"))
(s1 (make-struct vtable 0 "hello"))
(s2 (make-struct vtable 0 "hello")))
(equal? s1 s2)))
(pass-if "more complex structs"
(let ((first (make-ball red (string-copy "Bob")))
(second (make-ball red (string-copy "Bob"))))
(equal? first second)))
(pass-if "not-equal?"
(not (or (equal? (make-ball red "Bob") (make-ball green "Bob"))
(equal? (make-ball red "Bob") (make-ball red "Bill"))))))
;;
;; make-struct
;;
(define exception:bad-tail
(cons 'misc-error "tail array not allowed unless"))
(with-test-prefix "make-struct"
;; in guile 1.8.1 and earlier, this caused an error throw out of an
;; SCM_CRITICAL_SECTION_START / SCM_CRITICAL_SECTION_END, which abort()ed
;; the program
;;
(pass-if-exception "wrong type for `u' field" exception:wrong-type-arg
(let* ((vv (make-vtable-vtable "" 0))
(v (make-struct vv 0 (make-struct-layout "uw"))))
(make-struct v 0 'x)))
;; In guile 1.8.1 and earlier, and 1.6.8 and earlier, there was no check
;; on a tail array being created without an R/W/O type for it. This left
;; it uninitialized by scm_struct_init(), resulting in garbage getting
;; into an SCM when struct-ref read it (and attempting to print a garbage
;; SCM can cause a segv).
;;
(pass-if-exception "no R/W/O for tail array" exception:bad-tail
(let* ((vv (make-vtable-vtable "" 0))
(v (make-struct vv 0 (make-struct-layout "pw"))))
(make-struct v 123 'x))))
;;
;; make-vtable
;;
(with-test-prefix "make-vtable"
(pass-if "without printer"
(let* ((vtable (make-vtable "pwpr"))
(struct (make-struct vtable 0 'x 'y)))
(and (eq? 'x (struct-ref struct 0))
(eq? 'y (struct-ref struct 1)))))
(pass-if "with printer"
(let ()
(define (print struct port)
(display "hello" port))
(let* ((vtable (make-vtable "pwpr" print))
(struct (make-struct vtable 0 'x 'y))
(str (call-with-output-string
(lambda (port)
(display struct port)))))
(equal? str "hello")))))
;;; Local Variables:
;;; coding: latin-1
;;; End:
|