gml_scanner.h

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/* This software is distributed under the GNU Lesser General Public License */
//==========================================================================
//
//   gml_scanner.h 
//
//==========================================================================
// $Id: gml_scanner.h,v 1.11 2000/03/06 15:16:52 raitner Exp $

#ifndef GTL_GML_SCANNER_H
#define GTL_GML_SCANNER_H

#include <GTL/GTL.h>

#include <cstdio>

__GTL_BEGIN_NAMESPACE

/*
 * start-size of buffers for reading strings. If too small it will be enlarged
 * dynamically
 */

#define INITIAL_SIZE 1024

GTL_EXTERN typedef enum {
    GML_KEY, GML_INT, GML_DOUBLE, GML_STRING, GML_L_BRACKET, 
    GML_R_BRACKET, GML_END, GML_LIST, GML_ERROR
} GML_value; 


GTL_EXTERN typedef enum {
    GML_UNEXPECTED, GML_SYNTAX, GML_PREMATURE_EOF, GML_TOO_MANY_DIGITS,
    GML_OPEN_BRACKET, GML_TOO_MANY_BRACKETS, GML_OK, GML_FILE_NOT_FOUND
} GML_error_value;


struct GTL_EXTERN GML_error {
    GML_error_value err_num;
    
    int line;

    int column;
};


union GTL_EXTERN GML_tok_val {
    long integer;
    double floating;
    char* str;
    struct GML_error err;
};

struct GTL_EXTERN GML_token { 
    GML_value kind;
    union GML_tok_val value;
};

/*
 * global variables
 */

GTL_EXTERN extern unsigned int GML_line;
GTL_EXTERN extern unsigned int GML_column;

/*
 * if you are interested in the position where an error occured it is a good
 * idea to set GML_line and GML_column back. 
 * This is what GML_init does.
 */
 
GTL_EXTERN void GML_init ();

/*
 * returns the next token in file. If an error occured it will be stored in 
 * GML_token.
 */

GTL_EXTERN struct GML_token GML_scanner (FILE*);

GTL_EXTERN extern const char* GML_table[];

__GTL_END_NAMESPACE

#endif // GTL_GML_SCANNER_H

//--------------------------------------------------------------------------
//   end of file
//--------------------------------------------------------------------------