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    
017    package org.jetbrains.jet.lang.parsing;
018    
019    import com.intellij.psi.tree.IElementType;
020    
021    public abstract class AbstractTokenStreamPattern implements TokenStreamPattern {
022    
023        protected int lastOccurrence = -1;
024    
025        protected void fail() {
026            lastOccurrence = -1;
027        }
028    
029        @Override
030        public int result() {
031            return lastOccurrence;
032        }
033    
034        @Override
035        public boolean isTopLevel(int openAngleBrackets, int openBrackets, int openBraces, int openParentheses) {
036            return openBraces == 0 && openBrackets == 0 && openParentheses == 0 && openAngleBrackets == 0;
037        }
038    
039        @Override
040        public boolean handleUnmatchedClosing(IElementType token) {
041            return false;
042        }
043    }
044