001/*
002 * Copyright 2010-2013 JetBrains s.r.o.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.jetbrains.jet.lang.parsing;
018
019public class LastBefore extends AbstractTokenStreamPattern {
020    private final boolean dontStopRightAfterOccurrence;
021    private final TokenStreamPredicate lookFor;
022    private final TokenStreamPredicate stopAt;
023
024    private boolean previousLookForResult;
025
026    public LastBefore(TokenStreamPredicate lookFor, TokenStreamPredicate stopAt, boolean dontStopRightAfterOccurrence) {
027        this.lookFor = lookFor;
028        this.stopAt = stopAt;
029        this.dontStopRightAfterOccurrence = dontStopRightAfterOccurrence;
030    }
031
032    public LastBefore(TokenStreamPredicate lookFor, TokenStreamPredicate stopAt) {
033        this(lookFor, stopAt, false);
034    }
035
036    @Override
037    public boolean processToken(int offset, boolean topLevel) {
038        boolean lookForResult = lookFor.matching(topLevel);
039        if (lookForResult) {
040            lastOccurrence = offset;
041        }
042        if (stopAt.matching(topLevel)) {
043            if (topLevel
044                && (!dontStopRightAfterOccurrence
045                    || !previousLookForResult)) return true;
046        }
047        previousLookForResult = lookForResult;
048        return false;
049    }
050}