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;;; regexp-opt-tests.el --- Tests for regexp-opt.el -*- lexical-binding: t -*-
;; Copyright (C) 2013-2025 Free Software Foundation, Inc.
;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;; Keywords: internal
;; Human-Keywords: internal
;; 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/>.
;;; Code:
(require 'regexp-opt)
(defun regexp-opt-test--permutations (l)
"All permutations of L, assuming no duplicates."
(if (cdr l)
(mapcan (lambda (x)
(mapcar (lambda (p) (cons x p))
(regexp-opt-test--permutations (remove x l))))
l)
(list l)))
(ert-deftest regexp-opt-longest-match ()
"Check that the regexp always matches as much as possible."
(let ((s "abcd"))
(dolist (perm (regexp-opt-test--permutations '("a" "ab" "ac" "abc")))
(should (equal (and (string-match (regexp-opt perm) s)
(match-string 0 s))
"abc")))))
(ert-deftest regexp-opt-charset ()
(should (equal (regexp-opt-charset '(?a ?b ?a)) "[ab]"))
(should (equal (regexp-opt-charset '(?D ?d ?B ?a ?b ?C ?7 ?a ?c ?A))
"[7A-Da-d]"))
(should (equal (regexp-opt-charset '(?a)) "a"))
(should (equal (regexp-opt-charset '(?^)) "\\^"))
(should (equal (regexp-opt-charset '(?-)) "-"))
(should (equal (regexp-opt-charset '(?\])) "]"))
(should (equal (regexp-opt-charset '(?^ ?\])) "[]^]"))
(should (equal (regexp-opt-charset '(?^ ?-)) "[-^]"))
(should (equal (regexp-opt-charset '(?- ?\])) "[]-]"))
(should (equal (regexp-opt-charset '(?- ?\] ?^)) "[]^-]"))
(should (equal (regexp-opt-charset '(?^ ?a)) "[a^]"))
(should (equal (regexp-opt-charset '(?- ?a)) "[a-]"))
(should (equal (regexp-opt-charset '(?\] ?a)) "[]a]"))
(should (equal (regexp-opt-charset '(?^ ?\] ?a)) "[]a^]"))
(should (equal (regexp-opt-charset '(?^ ?- ?a)) "[a^-]"))
(should (equal (regexp-opt-charset '(?- ?\] ?a)) "[]a-]"))
(should (equal (regexp-opt-charset '(?- ?\] ?^ ?a)) "[]a^-]"))
(should (equal (regexp-opt-charset '()) regexp-unmatchable)))
;;; regexp-opt-tests.el ends here
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