;;;; sort.test --- tests Guile's sort functions    -*- scheme -*-
;;;; Copyright (C) 2003, 2006, 2007, 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

(use-modules (test-suite lib))

(define (randomize-vector! v n)
  (array-index-map! v (lambda (i) (random n)))
  v)

(with-test-prefix "sort"

  (pass-if-exception "less function taking less than two arguments"
    exception:wrong-num-args
    (sort '(1 2) (lambda (x) #t)))

  (pass-if-exception "less function taking more than two arguments"
    exception:wrong-num-args
    (sort '(1 2) (lambda (x y z) z)))

  (pass-if "sort!"
    (let ((v (randomize-vector! (make-vector 1000) 1000)))
      (sorted? (sort! v <) <)))

  (pass-if "sort! of non-contigous vector"
    (let* ((a (make-array 0 1000 3))
	   (v (make-shared-array a (lambda (i) (list i 0)) 1000)))
      (randomize-vector! v 1000)
      (sorted? (sort! v <) <)))

  (pass-if "sort! of negative-increment vector"
    (let* ((a (make-array 0 1000 3))
	   (v (make-shared-array a (lambda (i) (list (- 999 i) 0)) 1000)))
      (randomize-vector! v 1000)
      (sorted? (sort! v <) <)))

  (pass-if "stable-sort!"
    (let ((v (randomize-vector! (make-vector 1000) 1000)))
      (sorted? (stable-sort! v <) <)))

  (pass-if "stable-sort! of non-contigous vector"
    (let* ((a (make-array 0 1000 3))
	   (v (make-shared-array a (lambda (i) (list i 0)) 1000)))
      (randomize-vector! v 1000)
      (sorted? (stable-sort! v <) <)))

  (pass-if "stable-sort! of negative-increment vector"
    (let* ((a (make-array 0 1000 3))
	   (v (make-shared-array a (lambda (i) (list (- 999 i) 0)) 1000)))
      (randomize-vector! v 1000)
      (sorted? (stable-sort! v <) <))))


;;;
;;; stable-sort
;;;

(with-test-prefix "stable-sort"

  ;; in guile 1.8.0 and 1.8.1 this test failed, an empty list provoked a
  ;; wrong-type-arg exception (where it shouldn't)
  (pass-if "empty list"
    (eq? '() (stable-sort '() <)))

  ;; Ditto here, but up to 2.0.1 and 2.1.0 and invoking undefined
  ;; behavior (integer underflow) leading to crashes.
  (pass-if "empty vector"
    (equal? '#() (stable-sort '#() <))))