| /** |
| * Copyright (c) 2008-2009 Andrey Somov |
| * |
| * Licensed 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.yaml.snakeyaml.scanner; |
| |
| import java.util.List; |
| |
| import org.yaml.snakeyaml.tokens.Token; |
| |
| /** |
| * This interface represents an input stream of {@link Token Tokens}. |
| * <p> |
| * The parser and the scanner form together the 'Parse' step in |
| * the loading process (see chapter 3.1 of the |
| * <a href="http://www.yaml.org/spec/1.2/spec.html">YAML Specification</a>). |
| * </p> |
| * |
| * @see org.yaml.snakeyaml.tokens.Token |
| */ |
| public interface Scanner { |
| |
| /** |
| * Check if the next token is one of the given types. |
| * |
| * @param choices List of token types. |
| * @return <code>true</code> if the next token can be assigned to a |
| * variable of at least one of the given types. Returns <code>false</code> |
| * if no more tokens are available. |
| * @throws ScannerException Thrown in case of malformed input. |
| */ |
| boolean checkToken(List<Class<? extends Token>> choices); |
| |
| /** |
| * Check if the next token is assignable to the given type. |
| * <p> |
| * This is a convenience method to avoid <code>List</code> creation if |
| * calling {@link #checkToken(List)} for |
| * a single type. |
| * </p> |
| * @param choice Token type. |
| * @return True if the next token is an instance of <code>type</code>. |
| * False if no more tokens are available. |
| * @throws ScannerException Thrown in case of malformed input. |
| */ |
| boolean checkToken(Class<? extends Token> choice); |
| |
| /** |
| * Return the next token, but do not delete it from the stream. |
| * @return The token that will be returned on the next call to {@link #getToken} |
| * @throws ScannerException Thrown in case of malformed input. |
| */ |
| Token peekToken(); |
| |
| /** |
| * Returns the next token. |
| * <p>The token will be removed from the stream.</p> |
| * @throws ScannerException Thrown in case of malformed input. |
| */ |
| Token getToken(); |
| } |