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/* $Id: evaluator.h 1092 2010-01-23 12:04:55Z volker $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/evaluator.h $
*
* expression evaluation
*
* Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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, or (at your option)
* any later version.
*
* LCD4Linux 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef _EVALUATOR_H_
#define _EVALUATOR_H_
/* RESULT bitmask */
#define R_NUMBER 1
#define R_STRING 2
typedef struct {
int type;
int size;
double number;
char *string;
} RESULT;
/* strndup() may be not available on several platforms */
#ifndef HAVE_STRNDUP
#include <string.h>
char *strndup(const char *source, size_t len);
#endif
int SetVariable(const char *name, RESULT * value);
int SetVariableNumeric(const char *name, const double value);
int SetVariableString(const char *name, const char *value);
int AddFunction(const char *name, const int argc, void (*func) ());
void DeleteVariables(void);
void DeleteFunctions(void);
void DelResult(RESULT * result);
RESULT *SetResult(RESULT ** result, const int type, const void *value);
RESULT *CopyResult(RESULT ** result, RESULT * value);
double R2N(RESULT * result);
char *R2S(RESULT * result);
int Compile(const char *expression, void **tree);
int Eval(void *tree, RESULT * result);
void DelTree(void *tree);
#endif
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