1 /* 2 [The "BSD licence"] 3 Copyright (c) 2005-2007 Kunle Odutola 4 All rights reserved. 5 6 Redistribution and use in source and binary forms, with or without 7 modification, are permitted provided that the following conditions 8 are met: 9 1. Redistributions of source code MUST RETAIN the above copyright 10 notice, this list of conditions and the following disclaimer. 11 2. Redistributions in binary form MUST REPRODUCE the above copyright 12 notice, this list of conditions and the following disclaimer in 13 the documentation and/or other materials provided with the 14 distribution. 15 3. The name of the author may not be used to endorse or promote products 16 derived from this software without specific prior WRITTEN permission. 17 4. Unless explicitly state otherwise, any contribution intentionally 18 submitted for inclusion in this work to the copyright owner or licensor 19 shall be under the terms and conditions of this license, without any 20 additional terms or conditions. 21 22 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 35 namespace Antlr.Runtime 36 { 37 using System; 38 39 /// <summary> 40 /// This is the complete state of a stream. 41 /// 42 /// When walking ahead with cyclic DFA for syntactic predicates, we 43 /// need to record the state of the input stream (char index, line, 44 /// etc...) so that we can rewind the state after scanning ahead. 45 /// </summary> 46 public class CharStreamState 47 { 48 /// <summary>Index into the char stream of next lookahead char </summary> 49 internal int p; 50 51 /// <summary>What line number is the scanner at before processing buffer[p]? </summary> 52 internal int line; 53 54 /// <summary>What char position 0..n-1 in line is scanner before processing buffer[p]? </summary> 55 internal int charPositionInLine; 56 } 57 }