| /******************************************************************************* |
| * Copyright (c) 2007, 2008 Wind River Systems, Inc. and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * UIUC - Photran modifications |
| * Markus Schorn - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.photran.internal.core.preprocessor.c; |
| |
| class TokenList { |
| private Token fFirst; |
| private Token fLast; |
| |
| final Token removeFirst() { |
| final Token first= fFirst; |
| if (first == fLast) { |
| fFirst= fLast= null; |
| return first; |
| } |
| fFirst= (Token) first.getNext(); |
| return first; |
| } |
| |
| public final void append(Token t) { |
| if (fFirst == null) { |
| fFirst= fLast= t; |
| } |
| else { |
| fLast.setNext(t); |
| fLast= t; |
| } |
| t.setNext(null); |
| } |
| |
| public final void appendAll(TokenList tl) { |
| final Token t= tl.first(); |
| if (t != null) { |
| if (fFirst == null) { |
| fFirst= tl.fFirst; |
| } |
| else { |
| fLast.setNext(tl.fFirst); |
| } |
| fLast= tl.fLast; |
| } |
| tl.fFirst= tl.fLast= null; |
| } |
| |
| public final void appendAllButLast(TokenList tl) { |
| Token t= tl.first(); |
| if (t != null) { |
| for (Token n= (Token) t.getNext(); n != null; t=n, n= (Token) n.getNext()) { |
| append(t); |
| } |
| } |
| } |
| |
| public final void prepend(TokenList prepend) { |
| final Token first= prepend.fFirst; |
| if (first != null) { |
| final Token last= prepend.fLast; |
| last.setNext(fFirst); |
| fFirst= first; |
| if (fLast == null) { |
| fLast= last; |
| } |
| } |
| } |
| |
| public final TokenList cloneTokens() { |
| TokenList result= new TokenList(); |
| for (Token t= fFirst; t != null; t= (Token) t.getNext()) { |
| if (t.getType() != CPreprocessor.tSCOPE_MARKER) { |
| result.append((Token) t.clone()); |
| } |
| } |
| return result; |
| } |
| |
| public final Token first() { |
| return fFirst; |
| } |
| |
| public final Token last() { |
| return fLast; |
| } |
| |
| final void removeBehind(Token l) { |
| if (l == null) { |
| Token t= fFirst; |
| if (t != null) { |
| t= (Token) t.getNext(); |
| fFirst= t; |
| if (t == null) { |
| fLast= null; |
| } |
| } |
| } |
| else { |
| final Token r= (Token) l.getNext(); |
| if (r != null) { |
| l.setNext(r.getNext()); |
| if (r == fLast) { |
| fLast= l; |
| } |
| } |
| } |
| } |
| |
| void cutAfter(Token l) { |
| if (l == null) { |
| fFirst= fLast= null; |
| } |
| else { |
| l.setNext(null); |
| fLast= l; |
| } |
| } |
| |
| public void clear() { |
| fFirst= fLast= null; |
| } |
| |
| public boolean isEmpty() { |
| return fFirst==null; |
| } |
| } |