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;;; pcase-tests.el --- Test suite for pcase macro. -*- lexical-binding:t -*-
;; Copyright (C) 2012-2025 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'ert)
(require 'cl-lib)
(ert-deftest pcase-tests-base ()
"Test pcase code."
(should (equal (pcase '(1 . 2) ((app car '2) 6) ((app car '1) 5)) 5)))
(ert-deftest pcase-tests-bugs ()
(should (equal (pcase '(2 . 3) ;bug#18554
(`(,hd . ,(and (pred atom) tl)) (list hd tl))
((pred consp) nil))
'(2 3)))
(should (equal (pcase '(2 . 3)
(`(,hd . ,(and (pred (not consp)) tl)) (list hd tl))
((pred consp) nil))
'(2 3))))
(pcase-defmacro pcase-tests-plus (pat n)
`(app (lambda (v) (- v ,n)) ,pat))
(ert-deftest pcase-tests-macro ()
(should (equal (pcase 5 ((pcase-tests-plus x 3) x)) 2)))
(defun pcase-tests-grep (fname exp)
(when (consp exp)
(or (eq fname (car exp))
(cl-some (lambda (exp) (pcase-tests-grep fname exp)) (cdr exp)))))
(ert-deftest pcase-tests-tests ()
(should (pcase-tests-grep 'memq '(or (+ 2 3) (memq x y))))
(should-not (pcase-tests-grep 'memq '(or (+ 2 3) (- x y)))))
(ert-deftest pcase-tests-member ()
(should (pcase-tests-grep
'memq (macroexpand-all '(pcase x ((or 'a 'b 'c) body)))))
(should (pcase-tests-grep
'memql (macroexpand-all '(pcase x ((or 1 2 3 'a) body)))))
(should (pcase-tests-grep
'member (macroexpand-all '(pcase x ((or "a" 2 3 'a) body)))))
(should-not (pcase-tests-grep
'memq (macroexpand-all '(pcase x ((or "a" 2 3) body)))))
(should-not (pcase-tests-grep
'memql (macroexpand-all '(pcase x ((or "a" 2 3) body)))))
(let ((exp (macroexpand-all
'(pcase x
("a" body1)
(2 body2)
((or "a" 2 3) body)))))
(should-not (pcase-tests-grep 'memq exp))
(should-not (pcase-tests-grep 'member exp))))
(ert-deftest pcase-tests-vectors ()
(should (equal (pcase [1 2] (`[,x] 1) (`[,x ,y] (+ x y))) 3))
(should (pcase [1 2] (`[1 ,'2] t)))
(should (pcase '(1 2) (`(1 ,'2) t))))
(ert-deftest pcase-tests-quote-optimization ()
;; FIXME: We could/should also test that we get a corresponding
;; "shadowed branch" warning.
(should-not (pcase-tests-grep
'FOO (macroexpand '(pcase EXP
(`(,_ . ,_) (BAR))
('(a b) (FOO))))))
(let ((exp1 (macroexpand '(pcase EXP
(`(`(,(or 'a1 'b1)) (FOO1)))
('(c) (FOO2))
('(d) (FOO3))))))
(should (= 1 (with-temp-buffer (prin1 exp1 (current-buffer))
(goto-char (point-min))
(count-matches "(FOO3)"))))))
(ert-deftest pcase-tests-bug14773 ()
(let ((f (lambda (x)
(pcase 'dummy
((and (let var x) (guard var)) 'left)
((and (let var (not x)) (guard var)) 'right)))))
(should (equal (funcall f t) 'left))
(should (equal (funcall f nil) 'right))))
(ert-deftest pcase-tests-bug46786 ()
(let ((self 'outer))
(ignore self)
(should (equal (cl-macrolet ((show-self () `(list 'self self)))
(pcase-let ((`(,self ,_self2) '(inner "2")))
(show-self)))
'(self inner)))))
(ert-deftest pcase-tests-or-vars ()
(let ((f (lambda (v)
(pcase v
((or (and 'b1 (let x1 4) (let x2 5))
(and 'b2 (let y1 8) (let y2 9)))
(list x1 x2 y1 y2))))))
(should (equal (funcall f 'b1) '(4 5 nil nil)))
(should (equal (funcall f 'b2) '(nil nil 8 9)))))
(ert-deftest pcase-tests-cl-type ()
(should (equal (pcase 1
((cl-type integer) 'integer))
'integer))
(should (equal (pcase 1
((cl-type (integer 0 2)) 'integer-0<=n<=2))
'integer-0<=n<=2))
(should-error
;; Avoid error at compile time due to compiler macro.
(eval '(pcase 1
((cl-type notatype) 'integer))
t)))
(ert-deftest pcase-tests-setq ()
(should (equal (let (a b)
(pcase-setq `((,a) (,b)) '((1) (2)))
(list a b))
(list 1 2)))
(should (equal (list nil nil)
(let ((a 'unset)
(b 'unset))
(pcase-setq `(head ,a ,b) nil)
(list a b))))
(should (equal (let (a b)
(pcase-setq `[,a ,b] [1 2])
(list a b))
'(1 2)))
(should-error (let (a b)
(pcase-setq `[,a ,b] nil)
(list a b)))
(should (equal (let (a b)
(pcase-setq a 1 b 2)
(list a b))
'(1 2)))
(should (= (let (a)
(pcase-setq a 1 `(,a) '(2))
a)
2))
(should (equal (let (array list-item array-copy)
(pcase-setq (or `(,list-item) array) [1 2 3]
array-copy array
;; This re-sets `array' to nil.
(or `(,list-item) array) '(4))
(list array array-copy list-item))
'(nil [1 2 3] 4)))
(let ((a nil))
(should-error (pcase-setq a 1 b)
:type '(wrong-number-of-arguments))
(should (eq a nil)))
(should-error (pcase-setq a)
:type '(wrong-number-of-arguments)))
(ert-deftest pcase-tests-mutually-exclusive ()
(dolist (x '((functionp consp nil)
(functionp stringp t)
(compiled-function-p consp t)
(keywordp symbolp nil)
(keywordp symbol-with-pos-p nil)
(keywordp stringp t)))
(if (nth 2 x)
(should (pcase--mutually-exclusive-p (nth 0 x) (nth 1 x)))
(should-not (pcase--mutually-exclusive-p (nth 0 x) (nth 1 x))))
(if (nth 2 x)
(should (pcase--mutually-exclusive-p (nth 1 x) (nth 0 x)))
(should-not (pcase--mutually-exclusive-p (nth 1 x) (nth 0 x))))))
;;; pcase-tests.el ends here.
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