1 /* 2 [The "BSD license"] 3 Copyright (c) 2005-2009 Terence Parr 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 the 13 documentation and/or other materials provided with the distribution. 14 3. The name of the author may not be used to endorse or promote products 15 derived from this software without specific prior written permission. 16 17 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 package org.antlr.runtime.debug; 29 30 import org.antlr.runtime.*; 31 32 import java.util.List; 33 34 public class DebugTokenStream implements TokenStream { 35 protected DebugEventListener dbg; 36 public TokenStream input; 37 protected boolean initialStreamState = true; 38 39 /** Track the last mark() call result value for use in rewind(). */ 40 protected int lastMarker; 41 DebugTokenStream(TokenStream input, DebugEventListener dbg)42 public DebugTokenStream(TokenStream input, DebugEventListener dbg) { 43 this.input = input; 44 setDebugListener(dbg); 45 // force TokenStream to get at least first valid token 46 // so we know if there are any hidden tokens first in the stream 47 input.LT(1); 48 } 49 setDebugListener(DebugEventListener dbg)50 public void setDebugListener(DebugEventListener dbg) { 51 this.dbg = dbg; 52 } 53 consume()54 public void consume() { 55 if ( initialStreamState ) { 56 consumeInitialHiddenTokens(); 57 } 58 int a = input.index(); 59 Token t = input.LT(1); 60 input.consume(); 61 int b = input.index(); 62 dbg.consumeToken(t); 63 if ( b>a+1 ) { 64 // then we consumed more than one token; must be off channel tokens 65 for (int i=a+1; i<b; i++) { 66 dbg.consumeHiddenToken(input.get(i)); 67 } 68 } 69 } 70 71 /* consume all initial off-channel tokens */ consumeInitialHiddenTokens()72 protected void consumeInitialHiddenTokens() { 73 int firstOnChannelTokenIndex = input.index(); 74 for (int i=0; i<firstOnChannelTokenIndex; i++) { 75 dbg.consumeHiddenToken(input.get(i)); 76 } 77 initialStreamState = false; 78 } 79 LT(int i)80 public Token LT(int i) { 81 if ( initialStreamState ) { 82 consumeInitialHiddenTokens(); 83 } 84 dbg.LT(i, input.LT(i)); 85 return input.LT(i); 86 } 87 LA(int i)88 public int LA(int i) { 89 if ( initialStreamState ) { 90 consumeInitialHiddenTokens(); 91 } 92 dbg.LT(i, input.LT(i)); 93 return input.LA(i); 94 } 95 get(int i)96 public Token get(int i) { 97 return input.get(i); 98 } 99 mark()100 public int mark() { 101 lastMarker = input.mark(); 102 dbg.mark(lastMarker); 103 return lastMarker; 104 } 105 index()106 public int index() { 107 return input.index(); 108 } 109 range()110 public int range() { 111 return input.range(); 112 } 113 rewind(int marker)114 public void rewind(int marker) { 115 dbg.rewind(marker); 116 input.rewind(marker); 117 } 118 rewind()119 public void rewind() { 120 dbg.rewind(); 121 input.rewind(lastMarker); 122 } 123 release(int marker)124 public void release(int marker) { 125 } 126 seek(int index)127 public void seek(int index) { 128 // TODO: implement seek in dbg interface 129 // db.seek(index); 130 input.seek(index); 131 } 132 size()133 public int size() { 134 return input.size(); 135 } 136 getTokenSource()137 public TokenSource getTokenSource() { 138 return input.getTokenSource(); 139 } 140 getSourceName()141 public String getSourceName() { 142 return getTokenSource().getSourceName(); 143 } 144 toString()145 public String toString() { 146 return input.toString(); 147 } 148 toString(int start, int stop)149 public String toString(int start, int stop) { 150 return input.toString(start,stop); 151 } 152 toString(Token start, Token stop)153 public String toString(Token start, Token stop) { 154 return input.toString(start,stop); 155 } 156 } 157