package java_cup;
/**
* This class represents a reduce action within the parse table. The action
* simply stores the production that it reduces with and responds to queries
* about its type.
*
* @version last updated: 11/25/95
* @author Scott Hudson
*/
@SuppressWarnings (
{ "all" } )
public class reduce_action extends parse_action
{
/*-----------------------------------------------------------*/
/*--- Constructor(s) ----------------------------------------*/
/*-----------------------------------------------------------*/
/**
* Simple constructor.
*
* @param prod the production this action reduces with.
*/
public reduce_action ( production prod ) throws internal_error
{
/* sanity check */
if ( prod == null )
throw new internal_error (
"Attempt to create a reduce_action with a null production" );
_reduce_with = prod;
}
/*-----------------------------------------------------------*/
/*--- (Access to) Instance Variables ------------------------*/
/*-----------------------------------------------------------*/
/** The production we reduce with. */
protected production _reduce_with;
/** The production we reduce with. */
public production reduce_with ()
{
return _reduce_with;
}
/*-----------------------------------------------------------*/
/*--- General Methods ---------------------------------------*/
/*-----------------------------------------------------------*/
/** Quick access to type of action. */
public int kind ()
{
return REDUCE;
}
/* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
/** Equality test. */
public boolean equals ( reduce_action other )
{
return other != null && other.reduce_with () == reduce_with ();
}
/* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
/** Generic equality test. */
public boolean equals ( Object other )
{
if ( other instanceof reduce_action )
return equals ( ( reduce_action ) other );
else
return false;
}
/* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
/** Compute a hash code. */
public int hashCode ()
{
/* use the hash code of the production we are reducing with */
return reduce_with ().hashCode ();
}
/** Convert to string. */
public String toString ()
{
return "REDUCE(with prod " + reduce_with ().index () + ")";
}
/*-----------------------------------------------------------*/
}