/* scanner.h - interface to re2c source-file support via scanner type
 * Copyright (c) 2002, 2003, Ed L. Cashin
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 *
 */

#ifndef ELC_SCANNER_H
#define ELC_SCANNER_H

/* information for re2c-generated lexer */
typedef struct scanner_struct {
  int fd;
  unsigned char *buf_begin;	/* pointer to allocated buffer */
  unsigned char *token;         /* the current token */
  unsigned char *ptr;		/* for use as re2c's "marker" */
  unsigned char *cursor;	/* points to re2c's current place;
				 * will be one past any found token.
				 */
  unsigned char *pos;		/* the beginning of the current line */
  unsigned char *limit;         /* the character past the input that's been read
                                 * into the buffer */
  unsigned char *buf_end;	/* points to the position in memory one past
				 * the last character in the buffer
				 */
  unsigned char *eof;		/* when there's no more data to read, this
				 * will be equal to the cursor member.
				 */

  int line;			/* the number of the current line in the
				 * input.  (first line is line one).
				 */
} scanner;

/* clean slate */
void scanner_init(scanner *s);

/* scanner_init_for_buf - initialize a scanner for use in re2c code
 *                        that will scan the character buffer at buf.
 */
void scanner_init_for_buf(scanner *s, char *buf, int len);

void scanner_destroy(scanner *s); /* release internal resources and leave
				   * scanner in undefined state.
				   */

/* scanner_fill - read from s->fd into the scanner's buffer
 */
unsigned char *scanner_fill(scanner *s, unsigned char *cursor);

#endif