package java_cup;
/**
* This class serves as the base class for entries in a parse action table. Full
* entries will either be SHIFT(state_num), REDUCE(production), NONASSOC, or
* ERROR. Objects of this base class will default to ERROR, while the other
* three types will be represented by subclasses.
*
* @see java_cup.reduce_action
* @see java_cup.shift_action
* @version last updated: 7/2/96
* @author Frank Flannery
*/
@SuppressWarnings (
{ "all" } )
public class parse_action
{
/*-----------------------------------------------------------*/
/*--- Constructor(s) ----------------------------------------*/
/*-----------------------------------------------------------*/
/** Simple constructor. */
public parse_action ()
{
/* nothing to do in the base class */
}
/*-----------------------------------------------------------*/
/*--- (Access to) Static (Class) Variables ------------------*/
/*-----------------------------------------------------------*/
/** Constant for action type -- error action. */
public static final int ERROR = 0;
/* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
/** Constant for action type -- shift action. */
public static final int SHIFT = 1;
/* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
/** Constants for action type -- reduce action. */
public static final int REDUCE = 2;
/* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
/** Constants for action type -- reduce action. */
public static final int NONASSOC = 3;
/*-----------------------------------------------------------*/
/*--- General Methods ---------------------------------------*/
/*-----------------------------------------------------------*/
/** Quick access to the type -- base class defaults to error. */
public int kind ()
{
return ERROR;
}
/* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
/** Equality test. */
public boolean equals ( parse_action other )
{
/* we match all error actions */
return other != null && other.kind () == ERROR;
}
/* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
/** Generic equality test. */
public boolean equals ( Object other )
{
if ( other instanceof parse_action )
return equals ( ( parse_action ) other );
else
return false;
}
/* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
/** Compute a hash code. */
public int hashCode ()
{
/* all objects of this class hash together */
return 0xCafe123;
}
/* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
/** Convert to string. */
public String toString ()
{
return "ERROR";
}
/*-----------------------------------------------------------*/
}