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      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.Debug
     36 {
     37 	using System;
     38 	using Antlr.Runtime;
     39 	using ITreeAdaptor = Antlr.Runtime.Tree.ITreeAdaptor;
     40 	using ITreeNodeStream = Antlr.Runtime.Tree.ITreeNodeStream;
     41 
     42 
     43 	/// <summary>
     44 	/// The default tracer mimics the traceParser behavior of ANTLR 2.x.
     45 	/// This listens for debugging events from the parser and implies
     46 	/// that you cannot debug and trace at the same time.
     47 	/// </summary>
     48 	public class Tracer : BlankDebugEventListener
     49 	{
     50 		public IIntStream input;
     51 		protected int level = 0;
     52 
     53 		public Tracer(IIntStream input)
     54 		{
     55 			this.input = input;
     56 		}
     57 
     58 		override public void EnterRule(string grammarFileName, string ruleName)
     59 		{
     60 			for (int i = 1; i <= level; i++)
     61 			{
     62 				Console.Out.Write(" ");
     63 			}
     64 			Console.Out.WriteLine("> " + grammarFileName + " " + ruleName + " lookahead(1)=" + GetInputSymbol(1));
     65 			level++;
     66 		}
     67 
     68 		override public void ExitRule(string grammarFileName, string ruleName)
     69 		{
     70 			level--;
     71 			for (int i = 1; i <= level; i++)
     72 			{
     73 				Console.Out.Write(" ");
     74 			}
     75 			Console.Out.WriteLine("< " + grammarFileName + " " + ruleName + " lookahead(1)=" + GetInputSymbol(1));
     76 		}
     77 
     78 		public virtual object GetInputSymbol(int k)
     79 		{
     80 			if (input is ITokenStream)
     81 			{
     82 				return ((ITokenStream) input).LT(k);
     83 			}
     84 			return (char) input.LA(k);
     85 		}
     86 	}
     87 }