/**
* Copyright 2004-2016 Riccardo Solmi. All rights reserved.
* This file is part of the Whole Platform.
*
* The Whole Platform 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.
*
* The Whole Platform 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 the Whole Platform. If not, see <http://www.gnu.org/licenses/>.
*/
package scheme.old;
import java.util.List;
import java.util.Iterator;
class SchemeCondExpressionImpl implements SchemeExpression {
public SchemeCondExpressionImpl(List b, SchemeExpression e)
{
branches = b;
els = e;
}
public SchemeValue evaluate(SchemeEnvironment env) throws SchemeException
{
final Iterator i = branches.iterator();
while (i.hasNext())
{
final SchemeBranch branch = (SchemeBranch) i.next();
if (branch.getTest().evaluate(env).asBool())
return branch.getBody().evaluate(env);
}
if (els != null)
return els.evaluate(env);
else
throw new SchemeException("cond failed");
}
private final List branches;
private final SchemeExpression els;
}