/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
/*
 *  oafd: OAF CORBA dameon.
 *
 *  Copyright (C) 1999, 2000 Red Hat, Inc.
 *  Copyright (C) 1999, 2000 Eazel, Inc.
 *
 *  This library 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 of the
 *  License, or (at your option) any later version.
 *
 *  This library 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 library; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Authors: Elliot Lee <sopwith@redhat.com>,
 *
 */

#ifndef QUERY_EXPR_H
#define QUERY_EXPR_H 1

#include <bonobo-activation/Bonobo_ActivationContext.h>

#include <glib.h>

typedef enum
{ EXPR_FUNCTION, EXPR_VARIABLE, EXPR_ID, EXPR_BINOP, EXPR_UNOP, EXPR_CONSTANT }
QueryExprType;

typedef enum
{ CONST_STRING, CONST_STRINGV, CONST_NUMBER, CONST_BOOLEAN }
QueryExprConstType;

typedef struct
{
	QueryExprConstType type;
	union
	{
		char *v_string;
		char **v_stringv;
		gdouble v_number;
		gboolean v_boolean;
	}
	u;

	guchar value_known, needs_free;
}
QueryExprConst;

typedef struct _QueryExpr QueryExpr;

struct _QueryExpr
{
	QueryExprType type;

	union
	{
		struct
		{
			char *func_name;
			GSList *arguments;
		}
		function_value;

		char *var_value;
		char *id_value;

		struct
		{
			enum
			{ OP_EQ, OP_NEQ, OP_LEQ, OP_GEQ, OP_LT, OP_GT, OP_OR,
				OP_AND, OP_MULTIPLY, OP_DIVIDE, OP_ADD,
				OP_SUBTRACT, OP_XOR
			}
			type;

			QueryExpr *op1, *op2;
		}
		binop_value;

		struct
		{
			enum
			{ OP_NOT, OP_NEGATE }
			type;
			QueryExpr *op;
		}
		unop_value;

		QueryExprConst constant_value;
	}
	u;

	QueryExprConst cached_value;
	guchar has_fields, have_cached_value;
};

QueryExpr *qexp_binop_new (QueryExpr * op1, int operand, QueryExpr * op2);
QueryExpr *qexp_unop_new (int operand, QueryExpr * op);
QueryExpr *qexp_function_new (char *name, GSList * exprlist);
QueryExpr *qexp_variable_new (char *name);
QueryExpr *qexp_id_new (char *name);
QueryExpr *qexp_constant_new (QueryExprConst setme);

const char *qexp_parse (const char *_code, QueryExpr ** retme);	/* Return value is a string describing any errors */
void qexp_free (QueryExpr * qexp);

/* For debugging purposes */
void qexp_dump (QueryExpr * exp);
void qexp_constant_dump (QueryExprConst * c);
gint qexp_constant_compare (const QueryExprConst * c1,
			    const QueryExprConst * c2);

typedef struct _QueryContext QueryContext;

typedef QueryExprConst (*QueryIDEvaluateFunc) (Bonobo_ServerInfo * si,
					       const char *id,
					       QueryContext * qctx);

struct _QueryContext
{
	Bonobo_ServerInfo **sil;
	int nservers;

	QueryIDEvaluateFunc id_evaluator;

	CORBA_Context cctx;

	gpointer user_data;
};

QueryExprConst qexp_evaluate (Bonobo_ServerInfo * si, QueryExpr * e,
			      QueryContext * qctx);
gboolean qexp_matches (Bonobo_ServerInfo * si, QueryExpr * e,
		       QueryContext * qctx);
void qexp_sort (Bonobo_ServerInfo ** servers, int nservers, QueryExpr ** sexps,
		int nexps, QueryContext * qctx);

#endif