// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under MIT X11 license (for details please see \doc\license.txt)

using System;
using System.Collections.Generic;
using System.IO;

namespace ICSharpCode.NRefactory.VB.Parser
{
	public class LATextReader : TextReader
	{
		List<int> buffer;
		TextReader reader;
		
		public LATextReader(TextReader reader)
		{
			this.buffer = new List<int>();
			this.reader = reader;
		}
		
		public override int Peek()
		{
			return Peek(0);
		}
		
		public override int Read()
		{
			int c = Peek();
			buffer.RemoveAt(0);
			return c;
		}
		
		public int Peek(int step)
		{
			while (step >= buffer.Count) {
				buffer.Add(reader.Read());
			}
			
			if (step < 0)
				return -1;
			
			return buffer[step];
		}
		
		protected override void Dispose(bool disposing)
		{
			if (disposing)
				reader.Dispose();
			base.Dispose(disposing);
		}
	}
}