%{
/*
 * Copyright © 2021 Nick Bowler
 *
 * 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 <stdio.h>
#include <string.h>
#include <stdint.h>
#include <assert.h>

#include "cdecl99.h"
#include "commands.h"

typedef
#if STRTAB_MAX_OFFSET < UINT_LEAST8_MAX
uint_least8_t
#elif STRTAB_MAX_OFFSET < UINT_LEAST16_MAX
uint_least16_t
#else
#error do not know what type to use
#endif
cmd_index_type;

static const struct command *in_word_set();
%}

%struct-type
%compare-strncmp
%readonly-tables
%language=ANSI-C
%global-table
%pic

struct command {
	int_least8_t name;
	cmd_index_type cmd;
};
%%
explain, cmd_explain
simplify, cmd_simplify
declare, cmd_declare
type, cmd_type
help, cmd_help
quit, cmd_quit
exit, cmd_quit
%%
#include "cmdlist.h"

static int run_cmd_help(void)
{
	static const unsigned char offsets[] = CMD_SEQ;
	unsigned i;

	printf("Commands:\n");
	for (i = 0; i < sizeof offsets / sizeof offsets[0]; i++) {
		const struct command *c = &wordlist[offsets[i]];
		int w;

		w = printf("  %s", stringpool+c->name);
		if (w < 0 || w > 13) {
			putchar('\n');
			 0;
		}

		print_block(gettext(strtab+c->cmd), 15, w);
	}

	return 1;
}

int run_command(const char *line, int interactive)
{
	const char *cmd = line + strspn(line, " \t");
	const char *arg = cmd + strcspn(cmd, " \t");
	const struct command *c;

	/* empty command */
	if (cmd[0] == '\0')
		return 1;

	c = in_word_set(cmd, arg-cmd);
	if (!c) {
		fprintf(stderr, _("unknown command %.*s\n"),
		                (int)(arg-cmd), cmd);
		if (interactive) {
			fprintf(stderr, "%s\n",
			        _("Try \"help\" for a list of possible commands."));
		}
		return -1;
	}

	switch (c->cmd) {
	case cmd_help: return run_cmd_help();
	case cmd_declare: case cmd_type: return run_command_declare(cmd);
	case cmd_simplify: return run_command_simplify(arg);
	case cmd_explain: return run_command_explain(arg);
	case cmd_quit: return 1;
	}

	assert(0);
}