DocStreamReader.java

/*******************************************************************************
 *
 *	Copyright (C) 2011 Fujitsu Services Ltd.
 *
 *	Author: Nick Battle
 *
 *	This file is part of VDMJ.
 *
 *	VDMJ is free software: you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation, either version 3 of the License, or
 *	(at your option) any later version.
 *
 *	VDMJ 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 for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with VDMJ.  If not, see <http://www.gnu.org/licenses/>.
 *
 ******************************************************************************/

package org.overture.parser.lex;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

/**
 * A class to read .doc encoded VDM files.
 */

public class DocStreamReader extends InputStreamReader
{
	public DocStreamReader(InputStream in, String charsetName)
			throws UnsupportedEncodingException
	{
		super(in, charsetName);
	}

	private final static String MARKER = "%%VDM%%";

	@Override
	public int read(char[] array) throws IOException
	{
		BufferedReader br = new BufferedReader(this);
		boolean capturing = false;
		int pos = 0;
		String line = br.readLine();

		while (line != null)
		{
			if (line.endsWith(MARKER))
			{
				capturing = !capturing;
			} else
			{
				if (capturing)
				{
					line.getChars(0, line.length(), array, pos);
					pos += line.length();
					array[pos++] = '\n';
				}
			}

			line = br.readLine();
		}

		br.close();
		return pos;
	}
}