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/* Generated By:JavaCC: Do not edit this line. SimpleCharStream.java Version 4.0 */
package net.sf.mongodb_jdbc_driver.zql;

/**
 * An implementation of interface CharStream, where the stream is assumed to contain only ASCII characters
 * (without unicode processing).
 */

public class SimpleCharStream
{
	public static final boolean staticFlag = false;

	int bufsize;

	int available;

	int tokenBegin;

	public int bufpos = -1;

	protected int bufline[];

	protected int bufcolumn[];

	protected int column = 0;

	protected int line = 1;

	protected boolean prevCharIsCR = false;

	protected boolean prevCharIsLF = false;

	protected java.io.Reader inputStream;

	protected char[] buffer;

	protected int maxNextCharInd = 0;

	protected int inBuf = 0;

	protected int tabSize = 8;

	protected void setTabSize(int i)
	{
		tabSize = i;
	}

	protected int getTabSize(int i)
	{
		return tabSize;
	}

	protected void ExpandBuff(boolean wrapAround)
	{
		char[] newbuffer = new char[bufsize + 2048];
		int newbufline[] = new int[bufsize + 2048];
		int newbufcolumn[] = new int[bufsize + 2048];

		try
		{
			if (wrapAround)
			{
				System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
				System.arraycopy(buffer, 0, newbuffer, bufsize - tokenBegin, bufpos);
				buffer = newbuffer;

				System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
				System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);
				bufline = newbufline;

				System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
				System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);
				bufcolumn = newbufcolumn;

				maxNextCharInd = (bufpos += (bufsize - tokenBegin));
			}
			else
			{
				System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
				buffer = newbuffer;

				System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
				bufline = newbufline;

				System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
				bufcolumn = newbufcolumn;

				maxNextCharInd = (bufpos -= tokenBegin);
			}
		}
		catch (Throwable t)
		{
			throw new Error(t.getMessage());
		}

		bufsize += 2048;
		available = bufsize;
		tokenBegin = 0;
	}

	protected void FillBuff() throws java.io.IOException
	{
		if (maxNextCharInd == available)
		{
			if (available == bufsize)
			{
				if (tokenBegin > 2048)
				{
					bufpos = maxNextCharInd = 0;
					available = tokenBegin;
				}
				else if (tokenBegin < 0) bufpos = maxNextCharInd = 0;
				else ExpandBuff(false);
			}
			else if (available > tokenBegin) available = bufsize;
			else if ((tokenBegin - available) < 2048) ExpandBuff(true);
			else available = tokenBegin;
		}

		int i;
		try
		{
			if ((i = inputStream.read(buffer, maxNextCharInd, available - maxNextCharInd)) == -1)
			{
				inputStream.close();
				throw new java.io.IOException();
			}
			else maxNextCharInd += i;
			return;
		}
		catch (java.io.IOException e)
		{
			--bufpos;
			backup(0);
			if (tokenBegin == -1) tokenBegin = bufpos;
			throw e;
		}
	}

	public char BeginToken() throws java.io.IOException
	{
		tokenBegin = -1;
		char c = readChar();
		tokenBegin = bufpos;

		return c;
	}

	protected void UpdateLineColumn(char c)
	{
		column++;

		if (prevCharIsLF)
		{
			prevCharIsLF = false;
			line += (column = 1);
		}
		else if (prevCharIsCR)
		{
			prevCharIsCR = false;
			if (c == '\n')
			{
				prevCharIsLF = true;
			}
			else line += (column = 1);
		}

		switch (c)
		{
		case '\r':
			prevCharIsCR = true;
			break;
		case '\n':
			prevCharIsLF = true;
			break;
		case '\t':
			column--;
			column += (tabSize - (column % tabSize));
			break;
		default:
			break;
		}

		bufline[bufpos] = line;
		bufcolumn[bufpos] = column;
	}

	public char readChar() throws java.io.IOException
	{
		if (inBuf > 0)
		{
			--inBuf;

			if (++bufpos == bufsize) bufpos = 0;

			return buffer[bufpos];
		}

		if (++bufpos >= maxNextCharInd) FillBuff();

		char c = buffer[bufpos];

		UpdateLineColumn(c);
		return (c);
	}

	/**
	 * @deprecated
	 * @see #getEndColumn
	 */

	public int getColumn()
	{
		return bufcolumn[bufpos];
	}

	/**
	 * @deprecated
	 * @see #getEndLine
	 */

	public int getLine()
	{
		return bufline[bufpos];
	}

	public int getEndColumn()
	{
		return bufcolumn[bufpos];
	}

	public int getEndLine()
	{
		return bufline[bufpos];
	}

	public int getBeginColumn()
	{
		return bufcolumn[tokenBegin];
	}

	public int getBeginLine()
	{
		return bufline[tokenBegin];
	}

	public void backup(int amount)
	{

		inBuf += amount;
		if ((bufpos -= amount) < 0) bufpos += bufsize;
	}

	public SimpleCharStream(java.io.Reader dstream, int startline, int startcolumn, int buffersize)
	{
		inputStream = dstream;
		line = startline;
		column = startcolumn - 1;

		available = bufsize = buffersize;
		buffer = new char[buffersize];
		bufline = new int[buffersize];
		bufcolumn = new int[buffersize];
	}

	public SimpleCharStream(java.io.Reader dstream, int startline, int startcolumn)
	{
		this(dstream, startline, startcolumn, 4096);
	}

	public SimpleCharStream(java.io.Reader dstream)
	{
		this(dstream, 1, 1, 4096);
	}

	public void ReInit(java.io.Reader dstream, int startline, int startcolumn, int buffersize)
	{
		inputStream = dstream;
		line = startline;
		column = startcolumn - 1;

		if (buffer == null || buffersize != buffer.length)
		{
			available = bufsize = buffersize;
			buffer = new char[buffersize];
			bufline = new int[buffersize];
			bufcolumn = new int[buffersize];
		}
		prevCharIsLF = prevCharIsCR = false;
		tokenBegin = inBuf = maxNextCharInd = 0;
		bufpos = -1;
	}

	public void ReInit(java.io.Reader dstream, int startline, int startcolumn)
	{
		ReInit(dstream, startline, startcolumn, 4096);
	}

	public void ReInit(java.io.Reader dstream)
	{
		ReInit(dstream, 1, 1, 4096);
	}

	public SimpleCharStream(java.io.InputStream dstream, String encoding, int startline, int startcolumn,
		int buffersize) throws java.io.UnsupportedEncodingException
	{
		this(encoding == null ? new java.io.InputStreamReader(dstream) : new java.io.InputStreamReader(dstream,
			encoding), startline, startcolumn, buffersize);
	}

	public SimpleCharStream(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)
	{
		this(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize);
	}

	public SimpleCharStream(java.io.InputStream dstream, String encoding, int startline, int startcolumn)
		throws java.io.UnsupportedEncodingException
	{
		this(dstream, encoding, startline, startcolumn, 4096);
	}

	public SimpleCharStream(java.io.InputStream dstream, int startline, int startcolumn)
	{
		this(dstream, startline, startcolumn, 4096);
	}

	public SimpleCharStream(java.io.InputStream dstream, String encoding)
		throws java.io.UnsupportedEncodingException
	{
		this(dstream, encoding, 1, 1, 4096);
	}

	public SimpleCharStream(java.io.InputStream dstream)
	{
		this(dstream, 1, 1, 4096);
	}

	public void ReInit(java.io.InputStream dstream, String encoding, int startline, int startcolumn,
		int buffersize) throws java.io.UnsupportedEncodingException
	{
		ReInit(encoding == null ? new java.io.InputStreamReader(dstream) : new java.io.InputStreamReader(
			dstream, encoding), startline, startcolumn, buffersize);
	}

	public void ReInit(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)
	{
		ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize);
	}

	public void ReInit(java.io.InputStream dstream, String encoding)
		throws java.io.UnsupportedEncodingException
	{
		ReInit(dstream, encoding, 1, 1, 4096);
	}

	public void ReInit(java.io.InputStream dstream)
	{
		ReInit(dstream, 1, 1, 4096);
	}

	public void ReInit(java.io.InputStream dstream, String encoding, int startline, int startcolumn)
		throws java.io.UnsupportedEncodingException
	{
		ReInit(dstream, encoding, startline, startcolumn, 4096);
	}

	public void ReInit(java.io.InputStream dstream, int startline, int startcolumn)
	{
		ReInit(dstream, startline, startcolumn, 4096);
	}

	public String GetImage()
	{
		if (bufpos >= tokenBegin) return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
		else return new String(buffer, tokenBegin, bufsize - tokenBegin) + new String(buffer, 0, bufpos + 1);
	}

	public char[] GetSuffix(int len)
	{
		char[] ret = new char[len];

		if ((bufpos + 1) >= len) System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
		else
		{
			System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0, len - bufpos - 1);
			System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1);
		}

		return ret;
	}

	public void Done()
	{
		buffer = null;
		bufline = null;
		bufcolumn = null;
	}

	/**
	 * Method to adjust line and column numbers for the start of a token.
	 */
	public void adjustBeginLineColumn(int newLine, int newCol)
	{
		int start = tokenBegin;
		int len;

		if (bufpos >= tokenBegin)
		{
			len = bufpos - tokenBegin + inBuf + 1;
		}
		else
		{
			len = bufsize - tokenBegin + bufpos + 1 + inBuf;
		}

		int i = 0, j = 0, k = 0;
		int nextColDiff = 0, columnDiff = 0;

		while (i < len && bufline[j = start % bufsize] == bufline[k = ++start % bufsize])
		{
			bufline[j] = newLine;
			nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
			bufcolumn[j] = newCol + columnDiff;
			columnDiff = nextColDiff;
			i++;
		}

		if (i < len)
		{
			bufline[j] = newLine++;
			bufcolumn[j] = newCol + columnDiff;

			while (i++ < len)
			{
				if (bufline[j = start % bufsize] != bufline[++start % bufsize]) bufline[j] = newLine++;
				else bufline[j] = newLine;
			}
		}

		line = bufline[j];
		column = bufcolumn[j];
	}

}