SRAct.java

/*

File:     SRAct.java
Author:  zerksis d. umrigar (zdu@acm.org)
Copyright (C) 1997 Zerksis D. Umrigar
Last Update Time-stamp: "97/06/27 20:40:24 umrigar"

This code is distributed under the terms of the GNU General Public License.
See the file COPYING with this distribution, or

        http://www.fsf.org/copyleft/gpl.html

THERE IS ABSOLUTELY NO WARRANTY FOR THIS PROGRAM.

*/

package zdu.parsdemo;

class SRAct
{

    SRAct(int type, Rule rule)
    {
        this.type = type;
        this.stateOrRule = rule;
    }

    SRAct(int type, SRState state)
    {
        this.type = type;
        this.stateOrRule = state;
    }

    int getType()
    {
        return type;
    }

    SRState getState()
    {
        return (SRState)stateOrRule;
    }

    Rule getRule()
    {
        return (Rule)stateOrRule;
    }

    public String toString()
    {
        if (type == REDUCE)
        {
            return "r" + ((Rule)stateOrRule);
        }
        else
        {
            return ((type == SHIFT) ? "s" : "g") + (SRState)(stateOrRule);
        }
    }

    private int type;
    private Object stateOrRule;

    static final int SHIFT = 0;
    static final int REDUCE = SHIFT + 1;
    static final int GOTO = REDUCE + 1;
};