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 36 public class DebugTokenStream : ITokenStream 37 { 38 protected IDebugEventListener dbg; 39 public ITokenStream input; 40 protected bool initialStreamState = true; 41 42 /** <summary>Track the last mark() call result value for use in rewind().</summary> */ 43 protected int lastMarker; 44 45 public DebugTokenStream( ITokenStream input, IDebugEventListener dbg ) 46 { 47 this.input = input; 48 DebugListener = dbg; 49 // force TokenStream to get at least first valid token 50 // so we know if there are any hidden tokens first in the stream 51 input.LT( 1 ); 52 } 53 54 #region Properties 55 56 public virtual int Index 57 { 58 get 59 { 60 return input.Index; 61 } 62 } 63 64 public virtual int Range 65 { 66 get 67 { 68 return input.Range; 69 } 70 } 71 72 public virtual IDebugEventListener DebugListener 73 { 74 get 75 { 76 return dbg; 77 } 78 set 79 { 80 dbg = value; 81 } 82 } 83 84 #endregion 85 86 public virtual void Consume() 87 { 88 if ( initialStreamState ) 89 { 90 ConsumeInitialHiddenTokens(); 91 } 92 int a = input.Index; 93 IToken t = input.LT( 1 ); 94 input.Consume(); 95 int b = input.Index; 96 dbg.ConsumeToken( t ); 97 if ( b > a + 1 ) 98 { 99 // then we consumed more than one token; must be off channel tokens 100 for ( int i = a + 1; i < b; i++ ) 101 { 102 dbg.ConsumeHiddenToken( input.Get( i ) ); 103 } 104 } 105 } 106 107 /** <summary>Consume all initial off-channel tokens</summary> */ 108 protected virtual void ConsumeInitialHiddenTokens() 109 { 110 int firstOnChannelTokenIndex = input.Index; 111 for ( int i = 0; i < firstOnChannelTokenIndex; i++ ) 112 { 113 dbg.ConsumeHiddenToken( input.Get( i ) ); 114 } 115 initialStreamState = false; 116 } 117 118 public virtual IToken LT( int i ) 119 { 120 if ( initialStreamState ) 121 { 122 ConsumeInitialHiddenTokens(); 123 } 124 dbg.LT( i, input.LT( i ) ); 125 return input.LT( i ); 126 } 127 128 public virtual int LA( int i ) 129 { 130 if ( initialStreamState ) 131 { 132 ConsumeInitialHiddenTokens(); 133 } 134 dbg.LT( i, input.LT( i ) ); 135 return input.LA( i ); 136 } 137 138 public virtual IToken Get( int i ) 139 { 140 return input.Get( i ); 141 } 142 143 public virtual int Mark() 144 { 145 lastMarker = input.Mark(); 146 dbg.Mark( lastMarker ); 147 return lastMarker; 148 } 149 150 public virtual void Rewind( int marker ) 151 { 152 dbg.Rewind( marker ); 153 input.Rewind( marker ); 154 } 155 156 public virtual void Rewind() 157 { 158 dbg.Rewind(); 159 input.Rewind( lastMarker ); 160 } 161 162 public virtual void Release( int marker ) 163 { 164 } 165 166 public virtual void Seek( int index ) 167 { 168 // TODO: implement seek in dbg interface 169 // db.seek(index); 170 input.Seek( index ); 171 } 172 173 public virtual int Count 174 { 175 get 176 { 177 return input.Count; 178 } 179 } 180 181 public virtual ITokenSource TokenSource 182 { 183 get 184 { 185 return input.TokenSource; 186 } 187 } 188 189 public virtual string SourceName 190 { 191 get 192 { 193 return TokenSource.SourceName; 194 } 195 } 196 197 public override string ToString() 198 { 199 return input.ToString(); 200 } 201 202 public virtual string ToString( int start, int stop ) 203 { 204 return input.ToString( start, stop ); 205 } 206 207 public virtual string ToString( IToken start, IToken stop ) 208 { 209 return input.ToString( start, stop ); 210 } 211 } 212 } 213
