New package, `faceup'

`faceup' is a framework for regression testing of font-lock
keywords in ert.  It is based on a human-readable markup
language.  (Bug#16063 and bug#28311).

* lisp/emacs-lisp/faceup.el:
* test/lisp/emacs-lisp/faceup-tests/faceup-test-basics.el:
* test/lisp/emacs-lisp/faceup-tests/faceup-test-files.el:
* test/lisp/emacs-lisp/faceup-resources/faceup-test-mode.el:
* test/lisp/emacs-lisp/faceup-resources/faceup-test-this-file-directory.el:
* test/lisp/emacs-lisp/faceup-resources/files/test1.txt:
* test/lisp/emacs-lisp/faceup-resources/files/test1.txt.faceup:
New files.

test/lisp/emacs-lisp/faceup-resources/faceup-test-mode.el

@@ -0,0 +1,76 @@
+;;; faceup-test-mode.el --- Dummy major mode for testing `faceup'.
+
+;; Copyright (C) 2014-2017 Free Software Foundation, Inc.
+
+;; Author: Anders Lindgren
+;; Keywords: languages, faces
+
+;; 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:
+
+;; Dummy major-mode for testing `faceup', a regression test system for
+;; font-lock keywords (syntax highlighting rules for Emacs).
+;;
+;; This mode use `syntax-propertize' to set the `syntax-table'
+;; property on "<" and ">" in "<TEXT>" to make them act like
+;; parentheses.
+;;
+;; This mode also sets the `help-echo' property on the text WARNING,
+;; the effect is that Emacs displays a tooltip when you move your
+;; mouse on to the text.
+
+;;; Code:
+
+(defvar faceup-test-mode-syntax-table
+  (make-syntax-table)
+  "Syntax table for `faceup-test-mode'.")
+
+(defvar faceup-test-font-lock-keywords
+  '(("\\_<WARNING\\_>"
+     (0 (progn
+          (add-text-properties (match-beginning 0)
+                               (match-end 0)
+                               '(help-echo "Baloon tip: Fly smoothly!"))
+          font-lock-warning-face))))
+  "Highlight rules for `faceup-test-mode'.")
+
+(defun faceup-test-syntax-propertize (start end)
+  (goto-char start)
+  (funcall
+   (syntax-propertize-rules
+    ("\\(<\\)\\([^<>\n]*\\)\\(>\\)"
+     (1 "()  ")
+     (3 ")(  ")))
+   start end))
+
+(defmacro faceup-test-define-prog-mode (mode name &rest args)
+  "Define a major mode for a programming language.
+If `prog-mode' is defined, inherit from it."
+  (declare (indent defun))
+  `(define-derived-mode
+     ,mode ,(and (fboundp 'prog-mode) 'prog-mode)
+     ,name ,@args))
+
+(faceup-test-define-prog-mode faceup-test-mode "faceup-test"
+  "Dummy major mode for testing `faceup', a test system for font-lock."
+  (set (make-local-variable 'syntax-propertize-function)
+       #'faceup-test-syntax-propertize)
+  (setq font-lock-defaults '(faceup-test-font-lock-keywords nil)))
+
+(provide 'faceup-test-mode)
+
+;;; faceup-test-mode.el ends here

test/lisp/emacs-lisp/faceup-resources/faceup-test-this-file-directory.el

@@ -0,0 +1,32 @@
+;;; faceup-test-this-file-directory.el --- Support file for faceup tests
+
+;; Copyright (C) 2014-2017 Free Software Foundation, Inc.
+
+;; Author: Anders Lindgren
+;; Keywords: languages, faces
+
+;; 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:
+
+;; Support file for `faceup-test-basics.el'. This file is used to test
+;; `faceup-this-file-directory' in various contexts.
+
+;;; Code:
+
+(defvar faceup-test-this-file-directory (faceup-this-file-directory))
+
+;;; faceup-test-this-file-directory.el ends here

test/lisp/emacs-lisp/faceup-resources/files/test1.txt

@@ -0,0 +1,15 @@
+This is a test of `faceup', a regression test system for font-lock
+keywords. It should use major mode `faceup-test-mode'.
+
+WARNING: The first word on this line should use
+`font-lock-warning-face', and a tooltip should be displayed if the
+mouse pointer is moved over it.
+
+In this mode "<" and ">" are parentheses, but only when on the same
+line without any other "<" and ">" characters between them.
+<OK> <NOT <OK> >
+<
+NOT OK
+>
+
+test1.txt ends here.

test/lisp/emacs-lisp/faceup-resources/files/test1.txt.faceup

@@ -0,0 +1,15 @@
+This is a test of `faceup', a regression test system for font-lock
+keywords. It should use major mode `faceup-test-mode'.
+
+«(help-echo):"Baloon tip: Fly smoothly!":«w:WARNING»»: The first word on this line should use
+`font-lock-warning-face', and a tooltip should be displayed if the
+mouse pointer is moved over it.
+
+In this mode «s:"«(syntax-table):(4 . 41):<»"» and «s:"«(syntax-table):(5 . 40):>»"» are parentheses, but only when on the same
+line without any other «s:"«(syntax-table):(4 . 41):<»"» and «s:"«(syntax-table):(5 . 40):>»"» characters between them.
+«(syntax-table):(4 . 41):<»OK«(syntax-table):(5 . 40):>» <NOT «(syntax-table):(4 . 41):<»OK«(syntax-table):(5 . 40):>» >
+<
+NOT OK
+>
+
+test1.txt ends here.