001    /*
002     * Copyright 2010-2015 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    
017    package org.jetbrains.kotlin.parsing;
018    
019    public 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    }