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/*******************************************************************************
* Copyright (c) 2007 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:
* Markus Schorn - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.core.parser.scanner;
class TokenList {
private Token fFirst;
private Token fLast;
final Token removeFirst() {
final Token first= fFirst;
if (first == fLast) {
fFirst= fLast= null;
return first;
}
else {
fFirst= (Token) first.getNext();
return first;
}
}
final public void append(Token t) {
if (fFirst == null) {
fFirst= fLast= t;
}
else {
fLast.setNext(t);
fLast= t;
}
t.setNext(null);
}
final public 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;
}
}
}
final public 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;
}
final public Token first() {
return fFirst;
}
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;
}
}
}
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