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/* $Id: evaluator.h,v 1.9 2004/06/26 12:04:59 reinelt Exp $
*
* expression evaluation
*
* Copyright 1999, 2000 Michael Reinelt <reinelt@eunet.at>
* Copyright 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.
*
*
* $Log: evaluator.h,v $
* Revision 1.9 2004/06/26 12:04:59 reinelt
*
* uh-oh... the last CVS log message messed up things a lot...
*
* Revision 1.8 2004/06/26 09:27:21 reinelt
*
* added '-W' to CFLAGS
* changed all C++ comments to C ones
* cleaned up a lot of signed/unsigned mistakes
*
* Revision 1.7 2004/06/20 10:09:56 reinelt
*
* 'const'ified the whole source
*
* Revision 1.6 2004/03/11 06:39:59 reinelt
* big patch from Martin:
* - reuse filehandles
* - memory leaks fixed
* - earlier busy-flag checking with HD44780
* - reuse memory for strings in RESULT and hash
* - netdev_fast to wavid time-consuming regex
*
* Revision 1.5 2004/03/06 20:31:16 reinelt
* Complete rewrite of the evaluator to get rid of the code
* from mark Morley (because of license issues).
* The new Evaluator does a pre-compile of expressions, and
* stores them in trees. Therefore it should be reasonable faster...
*
* Revision 1.4 2004/03/03 03:47:04 reinelt
* big patch from Martin Hejl:
* - use qprintf() where appropriate
* - save CPU cycles on gettimeofday()
* - add quit() functions to free allocated memory
* - fixed lots of memory leaks
*
* Revision 1.3 2004/01/12 03:51:01 reinelt
* evaluating the 'Variables' section in the config file
*
* Revision 1.2 2003/10/11 06:01:53 reinelt
*
* renamed expression.{c,h} to client.{c,h}
* added config file client
* new functions 'AddNumericVariable()' and 'AddStringVariable()'
* new parameter '-i' for interactive mode
*
* Revision 1.1 2003/10/06 04:34:06 reinelt
* expression evaluator added
*
*/
#ifndef _EVALUATOR_H_
#define _EVALUATOR_H_
/* RESULT bitmask */
#define R_NUMBER 1
#define R_STRING 2
typedef struct {
int type;
double number;
int length;
char *string;
} RESULT;
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);
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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