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/* 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;
}
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