/***************************************************************************
    ltxfilelex.h  -  rules for reading EQC statements from a Latex file
    scanner generation file for flex
                             -------------------
    begin                : Sun Oct 21 2001
    copyright            : (C) 2001 by Jan Rheinlaender
    email                : jrheinlaender@users.sourceforge.net
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef __LTXFILELEX_H__
#define __LTXFILELEX_H__

#include <string>
#include <fstream>
#include <ginac/ginac.h>
#include "equation.h"
using namespace GiNaC;

// lex functions/variables
extern int yyerror(std::string* inputfile, const char *s);
extern int yylex(void);      // *** changed to yylex in 1.0
extern char *yytext;

// declarations for interfacing with the parser
extern int linenumber;
extern std::string argument; // *** added in 1.4.4
extern bool noraw; // *** added in 1.4.4

// helper functions for controlling input buffers from the parser
extern bool new_input_buffer (const std::string &fname);
extern bool pop_input_buffer();

// Make the output file available to the scanner (necessary for ECHO when scanning verbatim environments)
extern std::ofstream output; // *** added in 0.4

// Declarations for scanning arguments *** added in 0.6
enum scanmode {
  keyword,  // process EQC keywords and their parameters *** added in 0.8
  verb,     // scan up to the closing \verb token
  verbatim, // scan up to \end{verbatim}
  scan_ex,  // scan an expression or one equation of a list of equations, up to a ';' or a closing bracket '}'
  scan_str, // scan an arbitrary string up to a closing bracket '}'
  scan_stm, // scan anything up to a backslash '\', ignoring brackets (!)
  scan_qstr  // scan a string constant up to the closing " *** added in 0.8, changed to qstr in 1.2
};
extern void enter_state(const scanmode m); // *** changed name in 0.8
extern void exit_state(); // *** added in 0.8
extern void clear_state(); // *** added in 0.8
extern const scanmode get_state(); // *** added in 0.8
extern void set_implicit_mul(const bool how); // *** added in 0.8
extern void set_asterisk_statement(const bool how); // *** added in 1.4.3
extern const bool get_asterisk_statement(); 
#endif