/*

 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package jdk.nashorn.internal.codegen;

import java.util.ArrayList;

import java.util.List;

import jdk.nashorn.internal.ir.CompileUnitHolder;

import jdk.nashorn.internal.ir.FunctionNode;

import jdk.nashorn.internal.ir.LexicalContext;

import jdk.nashorn.internal.ir.LiteralNode;

import jdk.nashorn.internal.ir.LiteralNode.ArrayLiteralNode;

import jdk.nashorn.internal.ir.Node;

import jdk.nashorn.internal.ir.visitor.NodeVisitor;

/**

 * Base class for a node visitor that replaces {@link CompileUnit}s in {@link CompileUnitHolder}s.

 */

abstract class ReplaceCompileUnits extends NodeVisitor<LexicalContext> {

    ReplaceCompileUnits() {

        super(new LexicalContext());

    }

    /**

     * Override to provide a replacement for an old compile unit.

     * @param oldUnit the old compile unit to replace

     * @return the compile unit's replacement.

     */

    abstract CompileUnit getReplacement(final CompileUnit oldUnit);

    CompileUnit getExistingReplacement(final CompileUnitHolder node) {

        final CompileUnit oldUnit = node.getCompileUnit();

        assert oldUnit != null;

        final CompileUnit newUnit = getReplacement(oldUnit);

        assert newUnit != null;

        return newUnit;

    }

    @Override

    public Node leaveFunctionNode(final FunctionNode node) {

        return node.setCompileUnit(lc, getExistingReplacement(node));

    }

    @Override

    public Node leaveLiteralNode(final LiteralNode<?> node) {

        if (node instanceof ArrayLiteralNode) {

            final ArrayLiteralNode aln = (ArrayLiteralNode)node;

                return node;

            }

            }

        }

        return node;

    }

}