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;;;; structs.test --- Structures. -*- mode: scheme; coding: utf-8; -*-
;;;; Ludovic Courtès <ludo@gnu.org>, 2006-06-12.
;;;;
;;;; Copyright (C) 2006, 2007, 2009, 2010, 2012, 2017 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 (string-append standard-vtable-fields "pw") 0))
(define (make-ball-type ball-color)
(make-struct/no-tail ball-root
(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/no-tail type 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)
(eq? (struct-vtable ball-root) <standard-vtable>)
;; end of the vtable tower
(eq? (struct-vtable <standard-vtable>) <standard-vtable>)))
(pass-if "write"
(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")))
(pass-if "struct-ref"
(let ((ball (make-ball red "Alice")))
(equal? (struct-ref ball 0) "Alice")))
(pass-if "struct-set!"
(let* ((v (make-vtable "pw"))
(s (make-struct/no-tail v))
(r (struct-set! s 0 'a)))
(eq? r
(struct-ref s 0)
'a)))
(pass-if-exception "struct-ref out-of-range"
exception:out-of-range
(let* ((v (make-vtable "pwpw"))
(s (make-struct/no-tail v 'a 'b)))
(struct-ref s 2)))
(pass-if-exception "struct-set! out-of-range"
exception:out-of-range
(let* ((v (make-vtable "pwpw"))
(s (make-struct/no-tail v 'a 'b)))
(struct-set! s 2 'c))))
(with-test-prefix "equal?"
(pass-if "simple structs"
(let* ((vtable (make-vtable "pw"))
(s1 (make-struct/no-tail vtable "hello"))
(s2 (make-struct/no-tail vtable "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"))))))
(with-test-prefix "hash"
(pass-if "simple structs"
(let* ((v (make-vtable "pw"))
(s1 (make-struct/no-tail v "hello"))
(s2 (make-struct/no-tail v "hello")))
(= (hash s1 7777) (hash s2 7777))))
(pass-if "different structs"
(let* ((v (make-vtable "pw"))
(s1 (make-struct/no-tail v "hello"))
(s2 (make-struct/no-tail v "world")))
(or (not (= (hash s1 7777) (hash s2 7777)))
(throw 'unresolved))))
(pass-if "different struct types"
(let* ((v1 (make-vtable "pw"))
(v2 (make-vtable "pw"))
(s1 (make-struct/no-tail v1 "hello"))
(s2 (make-struct/no-tail v2 "hello")))
(or (not (= (hash s1 7777) (hash s2 7777)))
(throw 'unresolved))))
(pass-if "more complex structs"
(let ((s1 (make-ball red (string-copy "Bob")))
(s2 (make-ball red (string-copy "Bob"))))
(= (hash s1 7777) (hash s2 7777))))
(pass-if "struct with weird fields"
(let* ((v (make-vtable "pwuwph"))
(s1 (make-struct/no-tail v "hello" 123 "invisible-secret1"))
(s2 (make-struct/no-tail v "hello" 123 "invisible-secret2")))
(= (hash s1 7777) (hash s2 7777))))
(pass-if "cyclic structs"
(let* ((v (make-vtable "pw"))
(a (make-struct/no-tail v #f))
(b (make-struct/no-tail v a)))
(struct-set! a 0 b)
(and (hash a 7777) (hash b 7777) #t))))
;;
;; make-struct
;;
(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 standard-vtable-fields))
(v (make-struct/no-tail vv (make-struct-layout "uw"))))
(make-struct/no-tail v 'x))))
;;
;; make-vtable
;;
(with-test-prefix "make-vtable"
(pass-if "without printer"
(let* ((vtable (make-vtable "pwpw"))
(struct (make-struct/no-tail vtable '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 "pwpw" print))
(struct (make-struct/no-tail vtable 'x 'y))
(str (call-with-output-string
(lambda (port)
(display struct port)))))
(equal? str "hello")))))
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