| /* Graphical symbols. |
| |
| Copyright (C) 2020-2021 Free Software Foundation, Inc. |
| |
| This file is part of Bison, the GNU Compiler Compiler. |
| |
| 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 <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| #include "glyphs.h" |
| |
| #include <assert.h> |
| #include <attribute.h> |
| #include <stdbool.h> |
| #include <string.h> |
| #include <mbswidth.h> |
| #include <unicodeio.h> |
| |
| |
| glyph_buffer_t arrow; |
| int arrow_width; |
| |
| glyph_buffer_t down_arrow; |
| int down_arrow_width; |
| |
| glyph_buffer_t dot; |
| int dot_width; |
| |
| glyph_buffer_t empty; |
| int empty_width; |
| |
| const char *derivation_separator = " "; |
| int derivation_separator_width = 1; |
| |
| typedef struct |
| { |
| glyph_buffer_t *pbuf; |
| const char *fallback; |
| } callback_arg_t; |
| |
| |
| static long |
| on_success (const char *buf, size_t buflen, void *callback_arg) |
| { |
| callback_arg_t *arg = (callback_arg_t *) callback_arg; |
| assert (buflen + 1 < sizeof *arg->pbuf); |
| *stpncpy (*arg->pbuf, buf, buflen) = '\0'; |
| return 1; |
| } |
| |
| static long |
| on_failure (unsigned code MAYBE_UNUSED, const char *msg MAYBE_UNUSED, |
| void *callback_arg) |
| { |
| callback_arg_t *arg = (callback_arg_t *) callback_arg; |
| assert (strlen (arg->fallback) + 1 < sizeof *arg->pbuf); |
| strcpy (*arg->pbuf, arg->fallback); |
| return 0; |
| } |
| |
| static bool |
| glyph_set (glyph_buffer_t *glyph, int *width, |
| unsigned code, const char *fallback) |
| { |
| callback_arg_t arg = { glyph, fallback }; |
| int res = unicode_to_mb (code, on_success, on_failure, &arg); |
| *width = mbswidth (*glyph, 0); |
| return res; |
| } |
| |
| void |
| glyphs_init (void) |
| { |
| glyph_set (&arrow, &arrow_width, 0x2192, "->"); |
| glyph_set (&dot, &dot_width, 0x2022, "."); |
| glyph_set (&down_arrow, &down_arrow_width, 0x21b3, "`->"); |
| glyph_set (&empty, &empty_width, 0x03b5, "%empty"); |
| |
| strncat (down_arrow, " ", sizeof down_arrow - strlen (down_arrow) - 1); |
| down_arrow_width += 1; |
| } |