gcc/text-art/box-drawing.cc

   1 /* Procedural lookup of box drawing characters.
   2    Copyright (C) 2023 Free Software Foundation, Inc.
   3    Contributed by David Malcolm <dmalcolm@redhat.com>.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #define INCLUDE_VECTOR
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "text-art/box-drawing.h"
  26 #include "selftest.h"
  27 #include "text-art/selftests.h"
  28
  29
  30 /* According to
  31      https://en.wikipedia.org/wiki/Box-drawing_character#Character_code
  32    "DOS line- and box-drawing characters are not ordered in any programmatic
  33    manner, so calculating a particular character shape needs to use a look-up
  34    table. "
  35    Hence this array.  */
  36 static const cppchar_t box_drawing_chars[] = {
  37 #include "text-art/box-drawing-chars.inc"
  38 };
  39
  40 cppchar_t
  41 text_art::get_box_drawing_char (directions line_dirs)
  42 {
  43   const size_t idx = line_dirs.as_index ();
  44   gcc_assert (idx < 16);
  45   return box_drawing_chars[idx];
  46 }
  47
  48 #if CHECKING_P
  49
  50 namespace selftest {
  51
  52 /* Run all selftests in this file.  */
  53
  54 void
  55 text_art_box_drawing_cc_tests ()
  56 {
  57   ASSERT_EQ (text_art::get_box_drawing_char
  58               (text_art::directions (false, false, false, false)),
  59              ' ');
  60   ASSERT_EQ (text_art::get_box_drawing_char
  61                (text_art::directions (false, false, true, true)),
  62              0x2500); /* BOX DRAWINGS LIGHT HORIZONTAL */
  63   ASSERT_EQ (text_art::get_box_drawing_char
  64                (text_art::directions (true, true, false, false)),
  65              0x2502); /* BOX DRAWINGS LIGHT VERTICAL */
  66   ASSERT_EQ (text_art::get_box_drawing_char
  67                (text_art::directions (true, false, true, false)),
  68              0x2518); /* BOX DRAWINGS LIGHT UP AND LEFT */
  69 }
  70
  71 } // namespace selftest
  72
  73 #endif /* #if CHECKING_P */