Implement named character escapes, similar to Perl

* lread.c (init_character_names): New function.
(read_escape): Read Perl-style named character escape sequences.
(syms_of_lread): Initialize new variable 'character_names'.
* test/src/lread-tests.el (lread-char-empty-name): Add test file
for src/lread.c.

1 files changed, 54 insertions, 0 deletions

diff --git a/test/src/lread-tests.el b/test/src/lread-tests.el
new file mode 100644
index 00000000000..1f873340c56
--- /dev/null
+++ b/test/src/lread-tests.el
@@ -0,0 +1,54 @@
+;;; lread-tests.el --- tests for lread.c -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2016  Google Inc.
+
+;; Author: Philipp Stephani <phst@google.com>
+
+;; This file is part of GNU Emacs.
+
+;; This program 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.
+
+;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Unit tests for code in src/lread.c.
+
+;;; Code:
+
+(ert-deftest lread-char-number ()
+  (should (equal ?\N{U+A817} #xA817)))
+
+(ert-deftest lread-char-name ()
+  (should (equal ?\N{SYLOTI  NAGRI LETTER
+                 DHO}
+                 #xA817)))
+
+(ert-deftest lread-char-invalid-number ()
+  (should-error (read "?\\N{U+110000}") :type 'invalid-read-syntax))
+
+(ert-deftest lread-char-invalid-name ()
+  (should-error (read "?\\N{DOES NOT EXIST}")) :type 'invalid-read-syntax)
+
+(ert-deftest lread-char-non-ascii-name ()
+  (should-error (read "?\\N{LATIN CAPITAL LETTER Ø}")) 'invalid-read-syntax)
+
+(ert-deftest lread-char-empty-name ()
+  (should-error (read "?\\N{}")) 'invalid-read-syntax)
+
+(ert-deftest lread-string-char-number ()
+  (should (equal "a\N{U+A817}b" "a\uA817b")))
+
+(ert-deftest lread-string-char-name ()
+  (should (equal "a\N{SYLOTI NAGRI  LETTER DHO}b" "a\uA817b")))
+
+;;; lread-tests.el ends here