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This project contains a parser for the Checker Framework's stub files: https://checkerframework.org/manual/#stub . It is a fork of the JavaParser project.

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/*
 * Copyright (C) 2013-2024 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) 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.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser 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.
 */
package com.github.javaparser.printer.lexicalpreservation;

import java.io.StringWriter;

public class LexicalPreservingVisitor {

    private StringWriter writer;

    public LexicalPreservingVisitor() {
        this(new StringWriter());
    }

    public LexicalPreservingVisitor(StringWriter writer) {
        this.writer = writer;
    }

    public void visit(ChildTextElement child) {
        child.accept(this);
    }

    public void visit(TokenTextElement token) {
        writer.append(token.getText());
    }

    @Override
    public String toString() {
        return writer.toString();
    }
}