| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| package org.apache.royale.compiler.internal.parsing.as; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| import antlr.Token; |
| |
| import org.apache.royale.compiler.parsing.IASBalancingScanner; |
| import org.apache.royale.utils.NonLockingStringReader; |
| |
| /** |
| * Scanner that uses the ActionScript partitioner to determine whether {} braces |
| * are balanced over a particular span of the document |
| */ |
| public class ASBalancingScanner implements IASBalancingScanner |
| { |
| private int countBraces(Reader input) throws IOException |
| { |
| RawASTokenizer tokenizer = new RawASTokenizer(input); |
| Token token; |
| int counter = 0; |
| do |
| { |
| token = tokenizer.nextToken(); |
| if (token != null) |
| { |
| switch (token.getType()) |
| { |
| case ASTokenTypes.TOKEN_BLOCK_CLOSE: |
| counter--; |
| break; |
| case ASTokenTypes.TOKEN_BLOCK_OPEN: |
| counter++; |
| break; |
| default: |
| // Ignore other token types. |
| break; |
| } |
| } |
| } |
| while (token != null); |
| |
| return counter; |
| } |
| |
| @Override |
| public boolean areBracesBalanced(Reader input) |
| { |
| int braceCount = 0; |
| try |
| { |
| braceCount = countBraces(input); |
| } |
| catch (IOException e) |
| { |
| // Ignore |
| } |
| return (braceCount == 0); |
| } |
| |
| @Override |
| public boolean areBracesBalanced(String range) |
| { |
| return areBracesBalanced(new NonLockingStringReader(range)); |
| } |
| |
| @Override |
| public boolean areBracesBalancedOrOverbalanced(Reader input) |
| { |
| int braceCount = 0; |
| try |
| { |
| braceCount = countBraces(input); |
| } |
| catch (IOException e) |
| { |
| // Ignore |
| } |
| return (braceCount <= 0); |
| } |
| |
| @Override |
| public boolean areBracesBalancedOrOverbalanced(String range) |
| { |
| return areBracesBalancedOrOverbalanced(new NonLockingStringReader(range)); |
| } |
| } |