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evaluator.h

/* $Id: evaluator.h,v 1.11 2005/05/08 04:32:44 reinelt Exp $
 *
 * expression evaluation
 *
 * Copyright (C) 2003 Michael Reinelt <reinelt@eunet.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.
 *
 *
 * $Log: evaluator.h,v $
 * Revision 1.11  2005/05/08 04:32:44  reinelt
 * CodingStyle added and applied
 *
 * Revision 1.10  2005/01/18 06:30:23  reinelt
 * added (C) to all copyright statements
 *
 * 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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