64 lines
2.2 KiB
EmacsLisp
64 lines
2.2 KiB
EmacsLisp
;;; syntax-tests.el --- tests for syntax.el -*- lexical-binding: t; -*-
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;; Copyright (C) 2020-2024 Free Software Foundation, Inc.
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Code:
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(require 'ert)
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(require 'syntax)
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(ert-deftest syntax-propertize--shift-groups-and-backrefs ()
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"Test shifting of numbered groups and back-references in regexps."
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;; A numbered group must be shifted.
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(should
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(string=
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(syntax-propertize--shift-groups-and-backrefs
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"\\(?2:[abc]+\\)foobar" 2)
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"\\(?4:[abc]+\\)foobar"))
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;; A back-reference \1 on a normal sub-regexp context must be
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;; shifted.
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(should
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(string=
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(syntax-propertize--shift-groups-and-backrefs "\\(a\\)\\1" 2)
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"\\(a\\)\\3"))
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;; Shifting must not happen if the \1 appears in a character class,
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;; or in a \{\} repetition construct (although \1 isn't valid there
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;; anyway).
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(let ((rx-with-class "\\(a\\)[\\1-2]")
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(rx-with-rep "\\(a\\)\\{1,\\1\\}"))
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(should
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(string=
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(syntax-propertize--shift-groups-and-backrefs rx-with-class 2)
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rx-with-class))
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(should
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(string=
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(syntax-propertize--shift-groups-and-backrefs rx-with-rep 2)
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rx-with-rep)))
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;; Now numbered groups and back-references in combination.
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(should
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(string=
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(syntax-propertize--shift-groups-and-backrefs
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"\\(?2:[abc]+\\)foo\\(\\2\\)" 2)
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"\\(?4:[abc]+\\)foo\\(\\4\\)"))
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;; Emacs supports only the back-references \1,...,\9, so when a
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;; shift would result in \10 or more, an error must be signaled.
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(should-error
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(syntax-propertize--shift-groups-and-backrefs "\\(a\\)\\3" 7)))
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;;; syntax-tests.el ends here.
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