fixed some errors !

[lttv.git] / ltt / branches / poly / lttv / lttv / filter.h

/* This file is part of the Linux Trace Toolkit viewer
 * Copyright (C) 2003-2004 Michel Dagenais
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License Version 2 as
 * published by the Free Software Foundation;
 *
 * This program 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., 59 Temple Place - Suite 330, Boston, 
 * MA 02111-1307, USA.
 */

#ifndef FILTER_H
#define FILTER_H

#include <lttv/traceset.h>

/* A filter expression consists in nested AND, OR and NOT expressions
   involving boolean relation (>, >=, =, !=, <, <=) between event fields and 
   specific values. It is compiled into an efficient data structure which
   is used in functions to check if a given event or tracefile satisfies the
   filter.

   The grammar for filters is:

   filter = expression

   expression = "(" expression ")" | "!" expression | 
                expression "&&" expression | expression "||" expression |
                simpleExpression

   simpleExpression = fieldPath op value

   fieldPath = fieldComponent [ "." fieldPath ]

   fieldComponent = name [ "[" integer "]" ]

   value = integer | double | string 

*/

/**
 * 	@enum lttv_expression_op
 */
typedef enum _lttv_expression_op
{ 
  LTTV_FIELD_EQ,	/** equal */
  LTTV_FIELD_NE,	/** not equal */
  LTTV_FIELD_LT,	/** lower than */
  LTTV_FIELD_LE,	/** lower or equal */
  LTTV_FIELD_GT,	/** greater than */
  LTTV_FIELD_GE		/** greater or equal */
} lttv_expression_op;

typedef enum _lttv_expression_type
{ 
  LTTV_EXPRESSION,
  LTTV_SIMPLE_EXPRESSION
} lttv_expression_type;

typedef struct _lttv_simple_expression
{ 
  lttv_expression_op op;
  char *field_name;
  char *value;
} lttv_simple_expression;

typedef struct _lttv_expression 
{ 
  gboolean or;
  gboolean not;
  gboolean and;
  gboolean xor;
  gboolean simple_expression;
//  union e 
//  { 
//	struct lttv_expression *e;
//    	lttv_field_relation *se;
//  };
} lttv_expression;

typedef struct _lttv_filter_tree {
	lttv_expression* node;
	struct lttv_filter_tree* r_child;
	struct lttv_filter_tree* l_child;
} lttv_filter_tree;

/**
 * @struct lttv_filter
 * ( will later contain a binary tree of filtering options )
 */
typedef struct _lttv_filter {
	lttv_filter_tree* tree;	
} lttv_filter;

gboolean parse_simple_expression(GString* expression);

/* Compile the filter expression into an efficient data structure */

lttv_filter *lttv_filter_new(char *expression, LttvTrace *t);


/* Check if the tracefile or event satisfies the filter. The arguments are
   declared as void * to allow these functions to be used as hooks. */

gboolean lttv_filter_tracefile(lttv_filter *filter, void *tracefile);

gboolean lttv_filter_event(lttv_filter *filter, void *event);

#endif // FILTER_H