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/* $Id: evaluator.h,v 1.1 2003/10/06 04:34:06 reinelt Exp $
*
* expression evaluation
*
* based on EE (Expression Evaluator) which is
* (c) 1992 Mark Morley <morley@Camosun.BC.CA>
*
* heavily modified 2003 by Michael Reinelt <reinelt@eunet.at>
*
* FIXME: GPL or not GPL????
*
* $Log: evaluator.h,v $
* Revision 1.1 2003/10/06 04:34:06 reinelt
* expression evaluator added
*
*/
/***************************************************************************
** **
** EE.C Expression Evaluator **
** **
** AUTHOR: Mark Morley **
** COPYRIGHT: (c) 1992 by Mark Morley **
** DATE: December 1991 **
** HISTORY: Jan 1992 - Made it squash all command line arguments **
** into one big long string. **
** - It now can set/get VMS symbols as if they **
** were variables. **
** - Changed max variable name length from 5 to 15 **
** Jun 1992 - Updated comments and docs **
** **
** You are free to incorporate this code into your own works, even if it **
** is a commercial application. However, you may not charge anyone else **
** for the use of this code! If you intend to distribute your code, **
** I'd appreciate it if you left this message intact. I'd like to **
** receive credit wherever it is appropriate. Thanks! **
** **
** I don't promise that this code does what you think it does... **
** **
** Please mail any bug reports/fixes/enhancments to me at: **
** morley@camosun.bc.ca **
** or **
** Mark Morley **
** 3889 Mildred Street **
** Victoria, BC Canada **
** V8Z 7G1 **
** (604) 479-7861 **
** **
***************************************************************************/
#ifndef _EVALUATOR_H_
#define _EVALUATOR_H_
// RESULT bitmask
#define R_NUMBER 1
#define R_STRING 2
typedef struct {
int type;
double number;
char *string;
} RESULT;
// error codes
#define E_OK 0 /* Successful evaluation */
#define E_SYNTAX 1 /* Syntax error */
#define E_UNBALAN 2 /* Unbalanced parenthesis */
#define E_DIVZERO 3 /* Attempted division by zero */
#define E_UNKNOWN 4 /* Reference to unknown variable */
#define E_BADFUNC 5 /* Unrecognised function */
#define E_NUMARGS 6 /* Wrong number of arguments to function */
#define E_NOARG 7 /* Missing an argument to a function */
#define E_EMPTY 8 /* Empty expression */
int AddConstant (char *name, double value);
int AddFunction (char *name, int args, void (*func)());
RESULT* SetResult (RESULT **result, int type, void *value);
double R2N (RESULT *result);
char* R2S (RESULT *result);
int Eval (char* expression, RESULT *result);
#endif
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