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/***************************************************************************

    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