| /* |
| * |
| * 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 static org.apache.royale.compiler.common.ISourceLocation.UNKNOWN; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.royale.compiler.problems.SyntaxProblem; |
| |
| import antlr.Token; |
| |
| /** |
| * Base class for repairing token buffers. This handles insertion of semicolons, |
| * and also tracks errors. |
| */ |
| public abstract class BaseRepairingTokenBuffer implements IRepairingTokenBuffer |
| { |
| protected int position; |
| protected ASToken eofToken; |
| protected final List<SyntaxProblem> errors; |
| protected boolean nextIsSemicolon; |
| protected boolean insertSemis; |
| protected static final ASToken SEMICOLON = new ASToken(ASTokenTypes.TOKEN_SEMICOLON, UNKNOWN, UNKNOWN, UNKNOWN, UNKNOWN, ";"); |
| |
| public BaseRepairingTokenBuffer(String sourcePath) |
| { |
| position = 0; |
| eofToken = new ASToken(Token.EOF_TYPE, UNKNOWN, UNKNOWN, UNKNOWN, UNKNOWN, ""); |
| eofToken.setSourcePath(sourcePath); |
| errors = new ArrayList<SyntaxProblem>(); |
| nextIsSemicolon = false; |
| insertSemis = true; |
| } |
| |
| @Override |
| public void setEnableSemicolonInsertion(boolean enable) |
| { |
| insertSemis = enable; |
| } |
| |
| /** |
| * This method is called when an optional semicolon is inserted and is going |
| * to be returned as the next token. It is triggered in |
| * {@link #insertSemicolon(boolean)}. |
| */ |
| protected final void onSemicolonInserted() |
| { |
| nextIsSemicolon = true; |
| } |
| |
| @Override |
| public void addError(SyntaxProblem error) |
| { |
| errors.add(error); |
| } |
| |
| @Override |
| public final int mark() |
| { |
| return position; |
| } |
| |
| @Override |
| public ASToken LT(int i) |
| { |
| if (nextIsSemicolon) |
| return SEMICOLON; |
| |
| ASToken token = lookAheadSkipInsertedSemicolon(i); |
| assert token.verify() : "token failed verification: " + token.toString(); |
| return token; |
| } |
| |
| /** |
| * Look-ahead "i" tokens and ignore {@link #insertSemis} flag. Subclasses |
| * provide implementations specific to how they access the token buffer. |
| */ |
| abstract ASToken lookAheadSkipInsertedSemicolon(int i); |
| |
| @Override |
| public ASToken lookAheadSkipInsertedSemicolon() |
| { |
| return lookAheadSkipInsertedSemicolon(1); |
| } |
| |
| @Override |
| public final int LA(final int i) |
| { |
| return LT(i).getType(); |
| } |
| } |