xref: /external/antlr/antlr-3.4/runtime/CSharp2/Sources/Antlr3.Runtime/Antlr.Runtime/CharStreamState.cs

/*
[The "BSD licence"]
Copyright (c) 2005-2007 Kunle Odutola
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code MUST RETAIN the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form MUST REPRODUCE the above copyright
   notice, this list of conditions and the following disclaimer in
   the documentation and/or other materials provided with the
   distribution.
3. The name of the author may not be used to endorse or promote products
   derived from this software without specific prior WRITTEN permission.
4. Unless explicitly state otherwise, any contribution intentionally
   submitted for inclusion in this work to the copyright owner or licensor
   shall be under the terms and conditions of this license, without any
   additional terms or conditions.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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*/


namespace Antlr.Runtime
{
    using System;

	/// <summary>
    /// This is the complete state of a stream.
    ///
    /// When walking ahead with cyclic DFA for syntactic predicates, we
    /// need to record the state of the input stream (char index, line,
    /// etc...) so that we can rewind the state after scanning ahead.
	/// </summary>
	public class CharStreamState
	{
		/// <summary>Index into the char stream of next lookahead char </summary>
		internal int p;

		/// <summary>What line number is the scanner at before processing buffer[p]? </summary>
		internal int line;

		/// <summary>What char position 0..n-1 in line is scanner before processing buffer[p]? </summary>
		internal int charPositionInLine;
	}
}