/*
 * Copyright ©️ 2022 Mario Forzanini <mf@marioforzanini.com>
 *
 * This file is part of dwrt.
 *
 * Dwrt 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.
 *
 * Dwrt 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 dwrt. If not, see <https://www.gnu.org/licenses/>.
 *
 */

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "dat.h"
#include "fns.h"

#define BUFSZ 512

void
start_repl(int lflag, char var)
{
	char c, *buf;
	size_t offset, len;
	Parser *p;
	Node *result;

	c = '\0';
	offset = 0;
	len = BUFSZ;
	buf = ecalloc(len, sizeof(char));
	while (1) {
		while ((c = getchar()) != '\n' && c != EOF) {
			len = strappend(buf, c, offset++, len);
		}

		p = p_alloc_str(buf);
		if (parse(p) < 0) {
			fprintf(stderr, "%s", p->err);
			fflush(stdout);
			p_free(p);
			buf = memset(buf, 0, len);
			offset = 0;
			continue;
		}

		if (p->ast != NULL) {
			result = ast_dwrt(p->ast, var);

			if (lflag)
				ast_to_latex(result);
			else
				ast_print(result);
			printf("\n");
			fflush(stdout);
			ast_free(result);
		}

		p_free(p);
		buf = memset(buf, 0, len);
		offset = 0;
		if (c == EOF)
			break;
	}
	free(buf);
}