1 /* 2 * [The "BSD licence"] 3 * Copyright (c) 2005-2008 Terence Parr 4 * All rights reserved. 5 * 6 * Conversion to C#: 7 * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 namespace Antlr.Runtime.Debug 34 { 35 using Antlr.Runtime.JavaExtensions; 36 37 using Console = System.Console; 38 39 /** <summary> 40 * The default tracer mimics the traceParser behavior of ANTLR 2.x. 41 * This listens for debugging events from the parser and implies 42 * that you cannot debug and trace at the same time. 43 * </summary> 44 */ 45 public class Tracer : BlankDebugEventListener 46 { 47 public IIntStream input; 48 protected int level = 0; 49 Tracer( IIntStream input )50 public Tracer( IIntStream input ) 51 { 52 this.input = input; 53 } 54 EnterRule( string ruleName )55 public virtual void EnterRule( string ruleName ) 56 { 57 for ( int i = 1; i <= level; i++ ) 58 { 59 Console.Out.Write( " " ); 60 } 61 Console.Out.WriteLine( "> " + ruleName + " lookahead(1)=" + GetInputSymbol( 1 ) ); 62 level++; 63 } 64 ExitRule( string ruleName )65 public virtual void ExitRule( string ruleName ) 66 { 67 level--; 68 for ( int i = 1; i <= level; i++ ) 69 { 70 Console.Out.Write( " " ); 71 } 72 Console.Out.WriteLine( "< " + ruleName + " lookahead(1)=" + GetInputSymbol( 1 ) ); 73 } 74 GetInputSymbol( int k )75 public virtual object GetInputSymbol( int k ) 76 { 77 if ( input is ITokenStream ) 78 { 79 return ( (ITokenStream)input ).LT( k ); 80 } 81 return (char)input.LA( k ); 82 } 83 } 84 } 85 86