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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2022 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.Callable;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.Sequence;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.BooleanValue;
import net.sf.saxon.value.EmptySequence;
import net.sf.saxon.value.StringValue;

/**
 * Implements the XPath 2.0 fn:codepoint-equal() function.
 *
 * Compares two strings using the Unicode codepoint collation. (The function was introduced
 * specifically to allow URI comparison: URIs are promoted to strings when necessary.) 
 */

public class CodepointEqual extends SystemFunction implements Callable {

    @Override
    public Sequence call(XPathContext context, Sequence[] arguments) throws XPathException {
        StringValue op1 = (StringValue) arguments[0].head();
        StringValue op2 = (StringValue) arguments[1].head();
        if (op1 == null || op2 == null) {
            return EmptySequence.getInstance();
        }
        return BooleanValue.get(op1.getUnicodeStringValue().equals(op2.getUnicodeStringValue()));
    }

}