src/glyphs.h

   1 /* Graphical symbols.
   2
   3    Copyright (C) 2020-2021 Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    This program is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GLYPHS_H
  21 # define GLYPHS_H
  22
  23 /* Initialize the following variables.  */
  24 void glyphs_init (void);
  25
  26 /* In gnulib/lib/unicodeio.h unicode_to_mb uses a buffer of 25 bytes.
  27    In down_arrow, we append one space.  */
  28 typedef char glyph_buffer_t[26];
  29
  30 /* "→", separates the lhs of a rule from its rhs.  */
  31 extern glyph_buffer_t arrow;
  32 extern int arrow_width;
  33
  34 /* "•", a point in an item (aka, a dotted rule).  */
  35 extern glyph_buffer_t dot;
  36 extern int dot_width;
  37
  38 /* "↳ ", below an lhs to announce the rhs.  */
  39 extern glyph_buffer_t down_arrow;
  40 extern int down_arrow_width;
  41
  42 /* "ε", an empty rhs.  */
  43 extern glyph_buffer_t empty;
  44 extern int empty_width;
  45
  46 /* " ", separate symbols in the rhs of a derivation.  */
  47 extern const char *derivation_separator;
  48 extern int derivation_separator_width;
  49
  50 #endif /* GLYPHS_H */