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/*
* This file is part of Petascope.
*
* Petascope is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* Petascope 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Petascope. If not, see <http://www.gnu.org/licenses/>.
*
* For more information please see <http://www.Petascope.org>
* or contact Peter Baumann via <baumann@rasdaman.com>.
*
* Copyright 2009 Jacobs University Bremen, Peter Baumann.
*/
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.
*/
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() + ")";
}
/*-----------------------------------------------------------*/
}
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