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;;;; tests related to lists
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; While most of SBCL is derived from the CMU CL system, the test
;;;; files (like this one) were written from scratch after the fork
;;;; from CMU CL.
;;;;
;;;; This software is in the public domain and is provided with
;;;; absolutely no warranty. See the COPYING and CREDITS files for
;;;; more information.
(in-package :cl-user)
;;; Since *another* BUTLAST problem was reported (anonymously!) on the
;;; SourceForge summary page magical bugs web interface 2001-09-01, it
;;; looks as though it's past time to start accumulating regression
;;; tests for these.
(dolist (testcase
'((:args ((1 2 3 4 5)) :result (1 2 3 4))
(:args ((1 2 3 4 5) 6) :result nil)
(:args (nil) :result nil)
(:args ((1 2 3) 0) :result (1 2 3))
(:args ((1 2 3) 1) :result (1 2))
(:args ((1 2 3)) :result (1 2))
(:args ((1 2 3) 2) :result (1))
(:args ((1 2 3) 3) :result nil)
(:args ((1 2 3) 4) :result nil)
(:args ((1 2 3 . 4) 0) :result (1 2 3 . 4))
(:args ((1 2 3 . 4) 1) :result (1 2))
(:args ((1 2 3 . 4)) :result (1 2))
(:args ((1 2 3 . 4) 2) :result (1))
(:args ((1 2 3 . 4) 3) :result nil)
(:args ((1 2 3 . 4) 4) :result nil)))
(destructuring-bind (&key args result) testcase
(destructuring-bind (list &rest rest) args
;; Test with BUTLAST.
(let ((actual-result (apply #'butlast args)))
(when (and (consp list) (eq actual-result list))
(error "not a copy in BUTLAST for ~S" args))
(unless (equal actual-result result)
(error "failed BUTLAST for ~S" args)))
;; Test with NBUTLAST.
(let* ((copied-list (copy-list list))
(actual-result (apply #'nbutlast copied-list rest)))
(unless (equal actual-result result)
(error "failed NBUTLAST for ~S" args))))))
(multiple-value-bind (result error)
(ignore-errors (apply #'butlast (list t)))
(assert (null result))
(assert (typep error 'type-error)))
;;; reported by Paul Dietz on cmucl-imp: LDIFF does not check type of
;;; its first argument
(assert (not (ignore-errors (ldiff 1 2))))
;;; evaluation order in PUSH, PUSHNEW
(let ((a (map 'vector #'list '(a b c))))
(let ((i 0))
(pushnew (incf i) (aref a (incf i)))
(assert (equalp a #((a) (b) (1 c))))))
(symbol-macrolet ((s (aref a (incf i))))
(let ((a (map 'vector #'list '(a b c))))
(let ((i 0))
(push t s)
(assert (equalp a #((a) (t b) (c))))
(pushnew 1 s)
(assert (equalp a #((a) (t b) (1 c))))
(setq i 0)
(assert (eql (pop s) 't))
(assert (equalp a #((a) (b) (1 c)))))))
;;; Type checking in NCONC
(let ((tests '((((1 . 2)) (1 . 2))
(((1 . 2) (3 . 4)) (1 3 . 4))
(((1 . 2) 3) (1 . 3))
((3) 3))))
(loop for (args result) in tests
do (assert (equal (apply 'nconc (copy-tree args)) result))
do (let ((exp `(nconc ,@ (mapcar (lambda (arg)
`(copy-tree ',arg))
args))))
(assert (equal (funcall (compile nil `(lambda () ,exp))) result)))))
(let ((tests '(((3 (1 . 2)) 3)
(((1 . 2) 3 (4 . 5)) 3))))
(macrolet ((check-error (form failed-arg)
`(multiple-value-bind (.result. .error.)
(ignore-errors ,form)
(assert (null .result.))
(assert (typep .error. 'type-error))
(assert (eq (type-error-expected-type .error.) 'list))
(assert (equal (type-error-datum .error.) ,failed-arg)))))
(loop for (args fail) in tests
do (check-error (apply #'nconc (copy-tree args)) fail)
do (let ((exp `(nconc ,@ (mapcar (lambda (arg)
`(copy-tree ',arg))
args))))
(check-error (funcall (compile nil `(lambda () ,exp))) fail)))))
(dolist (test '((append 1 2)
(append (1 2) nil (3 . 4) nil)
(append nil (1 2) nil (3 . 4) nil)
(reverse (1 2 . 3))
(nreverse (1 2 . 3))
(nreconc (1 2 . 3) (4 5))
(copy-alist ((1 . 2) (3 . 4) . 5))))
(assert (raises-error? (apply (first test) (copy-tree (rest test)))
type-error)))
;;; Bug reported by Paul Dietz: NSET-EXCLUSIVE-OR should not return
;;; extra elements, even when given "sets" contain duplications
(assert (equal (remove-duplicates (sort (nset-exclusive-or (list 1 2 1 3)
(list 4 1 3 3))
#'<))
'(2 4)))
;;; Bug reported by Adam Warner: valid list index designator is not
;;; necessary a fixnum
(let ((s (read-from-string "(a . #1=(b c . #1#))")))
(assert (eq (nth (* 1440 most-positive-fixnum) s) 'c))
(setf (nth (* 1440 most-positive-fixnum) s) 14)
(assert (eq (nth (* 1440 most-positive-fixnum) s) 14)))
(let ((s (copy-list '(1 2 3))))
(assert (eq s (last s (* 1440 most-positive-fixnum))))
(assert (null (butlast s (* 1440 most-positive-fixnum))))
(assert (null (nbutlast s (* 1440 most-positive-fixnum)))))
;;; Bug reported by Paul Dietz: ASSOC should ignore NIL elements in a
;;; alist
(let ((f (compile nil '(lambda (x)
(assoc x '(nil (a . b) nil (nil . c) (c . d))
:test #'eq)))))
(assert (equal (funcall f 'nil) '(nil . c))))
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