parser_node.h

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/*
 * Copyright (c) 2013:  G-CSC, Goethe University Frankfurt
 * Author: Martin Rupp
 * 
 * This file is part of UG4.
 * 
 * UG4 is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 3 (as published by the
 * Free Software Foundation) with the following additional attribution
 * requirements (according to LGPL/GPL v3 §7):
 * 
 * (1) The following notice must be displayed in the Appropriate Legal Notices
 * of covered and combined works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (2) The following notice must be displayed at a prominent place in the
 * terminal output of covered works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (3) The following bibliography is recommended for citation and must be
 * preserved in all covered files:
 * "Reiter, S., Vogel, A., Heppner, I., Rupp, M., and Wittum, G. A massively
 *   parallel geometric multigrid solver on hierarchically distributed grids.
 *   Computing and visualization in science 16, 4 (2013), 151-164"
 * "Vogel, A., Reiter, S., Rupp, M., Nägel, A., and Wittum, G. UG4 -- a novel
 *   flexible software system for simulating pde based models on high performance
 *   computers. Computing and visualization in science 16, 4 (2013), 165-179"
 * 
 * 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 Lesser General Public License for more details.
 */
 
 
#ifndef PARSER_NODE_H
#define PARSER_NODE_H
 
typedef enum { typeCon=1, typeId=2, typeOpr=3 } nodeEnum;
 
/* constants */
typedef struct {
    double value;                  /* value of constant */
} conNodeType;
 
/* identifiers */
typedef struct {
    int i;                      /* subscript to sym array */
} idNodeType;
 
struct nodeType;
 
/* operators */
typedef struct {
    int oper;                   /* operator */
    int nops;                   /* number of operands */
    nodeType **op;  /* operands */
} oprNodeType;
 
struct nodeType
{
 
    nodeEnum type;              /* type of node */
 
    union {
        conNodeType con;        /* constants */
        idNodeType id;          /* identifiers */
        oprNodeType opr;        /* operators */
    };
};
 
#endif /*PARSER_NODE_H*/