| /* |
| [The "BSD license"] |
| Copyright (c) 2005-2009 Terence Parr |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| 1. Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| 2. Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| 3. The name of the author may not be used to endorse or promote products |
| derived from this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| package org.antlr.runtime.debug; |
| |
| import org.antlr.runtime.*; |
| |
| import java.util.List; |
| |
| public class DebugTokenStream implements TokenStream { |
| protected DebugEventListener dbg; |
| public TokenStream input; |
| protected boolean initialStreamState = true; |
| |
| /** Track the last mark() call result value for use in rewind(). */ |
| protected int lastMarker; |
| |
| public DebugTokenStream(TokenStream input, DebugEventListener dbg) { |
| this.input = input; |
| setDebugListener(dbg); |
| // force TokenStream to get at least first valid token |
| // so we know if there are any hidden tokens first in the stream |
| input.LT(1); |
| } |
| |
| public void setDebugListener(DebugEventListener dbg) { |
| this.dbg = dbg; |
| } |
| |
| public void consume() { |
| if ( initialStreamState ) { |
| consumeInitialHiddenTokens(); |
| } |
| int a = input.index(); |
| Token t = input.LT(1); |
| input.consume(); |
| int b = input.index(); |
| dbg.consumeToken(t); |
| if ( b>a+1 ) { |
| // then we consumed more than one token; must be off channel tokens |
| for (int i=a+1; i<b; i++) { |
| dbg.consumeHiddenToken(input.get(i)); |
| } |
| } |
| } |
| |
| /* consume all initial off-channel tokens */ |
| protected void consumeInitialHiddenTokens() { |
| int firstOnChannelTokenIndex = input.index(); |
| for (int i=0; i<firstOnChannelTokenIndex; i++) { |
| dbg.consumeHiddenToken(input.get(i)); |
| } |
| initialStreamState = false; |
| } |
| |
| public Token LT(int i) { |
| if ( initialStreamState ) { |
| consumeInitialHiddenTokens(); |
| } |
| dbg.LT(i, input.LT(i)); |
| return input.LT(i); |
| } |
| |
| public int LA(int i) { |
| if ( initialStreamState ) { |
| consumeInitialHiddenTokens(); |
| } |
| dbg.LT(i, input.LT(i)); |
| return input.LA(i); |
| } |
| |
| public Token get(int i) { |
| return input.get(i); |
| } |
| |
| public int mark() { |
| lastMarker = input.mark(); |
| dbg.mark(lastMarker); |
| return lastMarker; |
| } |
| |
| public int index() { |
| return input.index(); |
| } |
| |
| public int range() { |
| return input.range(); |
| } |
| |
| public void rewind(int marker) { |
| dbg.rewind(marker); |
| input.rewind(marker); |
| } |
| |
| public void rewind() { |
| dbg.rewind(); |
| input.rewind(lastMarker); |
| } |
| |
| public void release(int marker) { |
| } |
| |
| public void seek(int index) { |
| // TODO: implement seek in dbg interface |
| // db.seek(index); |
| input.seek(index); |
| } |
| |
| public int size() { |
| return input.size(); |
| } |
| |
| public TokenSource getTokenSource() { |
| return input.getTokenSource(); |
| } |
| |
| public String getSourceName() { |
| return getTokenSource().getSourceName(); |
| } |
| |
| public String toString() { |
| return input.toString(); |
| } |
| |
| public String toString(int start, int stop) { |
| return input.toString(start,stop); |
| } |
| |
| public String toString(Token start, Token stop) { |
| return input.toString(start,stop); |
| } |
| } |