////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2017 Saxonica Limited.
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.functions;

import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.TailExpression;
import net.sf.saxon.expr.TailIterator;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.Sequence;
import net.sf.saxon.om.SequenceTool;
import net.sf.saxon.trans.XPathException;

/**
 * This class implements the function fn:tail(), which is a standard function in XPath 3.0
 */

public class TailFn extends SystemFunction {

    /**
     * Evaluate the expression
     *
     * @param context   the dynamic evaluation context
     * @param arguments the values of the arguments, supplied as Sequences
     * @return the result of the evaluation, in the form of a Sequence
     * @throws net.sf.saxon.trans.XPathException
     *          if a dynamic error occurs during the evaluation of the expression
     */
    public Sequence call(XPathContext context, Sequence[] arguments) throws XPathException {
        return SequenceTool.toLazySequence(TailIterator.make(arguments[0].iterate(), 2));
    }

    /**
     * Convert static calls into a TailExpression
     * @param arguments the supplied arguments to the call
     * @return a TailExpression
     */

    @Override
    public TailExpression makeFunctionCall(Expression[] arguments) {
        return new TailExpression(arguments[0], 2);
    }
}

// Copyright (c) 2010-2015 Saxonica Limited.