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;;;; hooks.test --- tests guile's hooks implementation  -*- scheme -*-
;;;; Copyright (C) 1999 Free Software Foundation, Inc.
;;;; 
;;;; This program is free software; you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation; either version 2, or (at your option)
;;;; any later version.
;;;; 
;;;; This program 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 General Public License for more details.
;;;; 
;;;; You should have received a copy of the GNU General Public License
;;;; along with this software; see the file COPYING.  If not, write to
;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
;;;; Boston, MA 02111-1307 USA
;;;;
;;;; As a special exception, the Free Software Foundation gives permission
;;;; for additional uses of the text contained in its release of GUILE.
;;;;
;;;; The exception is that, if you link the GUILE library with other files
;;;; to produce an executable, this does not by itself cause the
;;;; resulting executable to be covered by the GNU General Public License.
;;;; Your use of that executable is in no way restricted on account of
;;;; linking the GUILE library code into it.
;;;;
;;;; This exception does not however invalidate any other reasons why
;;;; the executable file might be covered by the GNU General Public License.
;;;;
;;;; This exception applies only to the code released by the
;;;; Free Software Foundation under the name GUILE.  If you copy
;;;; code from other Free Software Foundation releases into a copy of
;;;; GUILE, as the General Public License permits, the exception does
;;;; not apply to the code that you add in this way.  To avoid misleading
;;;; anyone as to the status of such modified files, you must delete
;;;; this exception notice from them.
;;;;
;;;; If you write modifications of your own for GUILE, it is your choice
;;;; whether to permit this exception to apply to your modifications.
;;;; If you do not wish that, delete this exception notice.  

;;; {Description} 
;;;
;;; A test suite for hooks. I maybe should've split off some of the
;;; stuff (like with alists), but this is small enough that it
;;; probably isn't worth the hassle. A little note: in some places it
;;; catches all errors when it probably shouldn't, since there's only
;;; one error we consider correct. This is mostly because the
;;; add-hook! error in released guiles isn't really accurate
;;; This should be changed once a released version returns
;;; wrong-type-arg from add-hook!

;; {Utility stuff}
;; Evaluate form inside a catch; if it throws an error, return true
;; This is good for checking that errors are not ignored 

(define-macro (catch-error-returning-true error . form)
  `(catch ,error (lambda () (begin ,@form #f)) (lambda (key . args) #t)))

;; Evaluate form inside a catch; if it throws an error, return false
;; Good for making sure that errors don't occur

(define-macro (catch-error-returning-false error . form)
  `(catch ,error (lambda () (begin ,@form #t)) (lambda (key . args) #f)))

;; pass-if-not: syntactic sugar

(define-macro (pass-if-not string form)
  `(pass-if ,string (not ,form)))

;; {The tests}
(catch-test-errors
 (let  ((proc1 (lambda (x) (+ x 1)))
        (proc2 (lambda (x) (- x 1)))
        (bad-proc (lambda (x y) #t)))
   (with-test-prefix "hooks"
    (pass-if "make-hook"
             (catch-error-returning-false 
              #t
              (define x (make-hook 1))))

    (pass-if "add-hook!"
             (catch-error-returning-false 
              #t
              (let ((x (make-hook 1)))
                (add-hook! x proc1)
                (add-hook! x proc2))))
               
    (with-test-prefix "add-hook!"
                      (pass-if "append"
                               (let ((x (make-hook 1)))
                                 (add-hook! x proc1)
                                 (add-hook! x proc2 #t)
                                 (eq? (cadr (hook->list x))
                                      proc2)))
                      (pass-if "illegal proc"
                               (catch-error-returning-true 
                                #t 
                                (let ((x (make-hook 1)))
                                  (add-hook! x bad-proc))))
                      (pass-if "illegal hook"
                               (catch-error-returning-true
                                'wrong-type-arg
                                (add-hook! '(foo) proc1))))
    (pass-if "run-hook"
             (let ((x (make-hook 1)))
               (catch-error-returning-false #t
                                            (add-hook! x proc1)
                                            (add-hook! x proc2)
                                            (run-hook x 1))))
   (with-test-prefix "run-hook"
                     (pass-if "bad hook"
                                  (catch-error-returning-true
                                   #t
                                   (let ((x (cons 'a 'b)))
                                     (run-hook x 1))))
                     (pass-if "too many args"
                                  (let ((x (make-hook 1)))
                                    (catch-error-returning-true
                                     #t
                                     (add-hook! x proc1)
                                     (add-hook! x proc2)
                                     (run-hook x 1 2))))

                     (pass-if 
                      "destructive procs"
                      (let ((x (make-hook 1))
                            (dest-proc1 (lambda (x) 
                                          (set-car! x 
                                                    'i-sunk-your-battleship)))
                            (dest-proc2 (lambda (x) (set-cdr! x 'no-way!)))
                            (val '(a-game-of battleship)))
                        (add-hook! x dest-proc1)
                        (add-hook! x dest-proc2 #t)
                        (run-hook x val)
                        (and (eq? (car val) 'i-sunk-your-battleship)
                             (eq? (cdr val) 'no-way!)))))

   (pass-if "make-hook-with-name"
            (catch-error-returning-false 
             #t
             (let ((x (make-hook-with-name 'x 1)))
               (add-hook! x proc1))))
   (pass-if "make-hook-with-name: bad name"
            (catch-error-returning-true
             'wrong-type-arg
             (define x (make-hook-with-name '(a b) 1))))

   (with-test-prefix "remove-hook!"
                     (pass-if ""
                              (let ((x (make-hook 1)))
                                (add-hook! x proc1)
                                (add-hook! x proc2)
                                (remove-hook! x proc1)
                                (not (memq proc1 (hook->list x)))))
                     ; Maybe it should error, but this is probably
                     ; more convienient
                     (pass-if "empty hook"
                              (catch-error-returning-false
                               #t
                               (let ((x (make-hook 1)))
                                 (remove-hook! x proc1)))))
   (pass-if "hook->list"
            (let ((x (make-hook 1)))
              (add-hook! x proc1)
              (add-hook! x proc2)
              (and (memq proc1 (hook->list x) )
                   (memq proc2 (hook->list x)))))
   (pass-if "reset-hook!"
            (let ((x (make-hook 1)))
              (add-hook! x proc1)
              (add-hook! x proc2)
              (reset-hook! x)
              (null? (hook->list x))))
   (with-test-prefix "reset-hook!"
                     (pass-if "empty hook"
                              (let ((x (make-hook 1)))
                                (reset-hook! x)))
                     (pass-if "bad hook"
                              (catch-error-returning-true
                               #t
                               (reset-hook! '(a b))))))))