CharStream.cs
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上传日期:2013-09-30
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- /*
- * Copyright 2004 The Apache Software Foundation
- *
- * 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.
- */
- /* Generated By:JavaCC: Do not edit this line. CharStream.java Version 3.0 */
- using System;
- namespace Lucene.Net.Analysis.Standard
- {
-
- /// <summary> This interface describes a character stream that maintains line and
- /// column number positions of the characters. It also has the capability
- /// to backup the stream to some extent. An implementation of this
- /// interface is used in the TokenManager implementation generated by
- /// JavaCCParser.
- ///
- /// All the methods except backup can be implemented in any fashion. backup
- /// needs to be implemented correctly for the correct operation of the lexer.
- /// Rest of the methods are all used to get information like line number,
- /// column number and the String that constitutes a token and are not used
- /// by the lexer. Hence their implementation won't affect the generated lexer's
- /// operation.
- /// </summary>
-
- public interface CharStream
- {
-
- /// <summary> Returns the next character from the selected input. The method
- /// of selecting the input is the responsibility of the class
- /// implementing this interface. Can throw any java.io.IOException.
- /// </summary>
- char ReadChar();
-
- /// <summary> Returns the column position of the character last read.</summary>
- /// <deprecated>
- /// </deprecated>
- /// <seealso cref="getEndColumn">
- /// </seealso>
- int GetColumn();
-
- /// <summary> Returns the line number of the character last read.</summary>
- /// <deprecated>
- /// </deprecated>
- /// <seealso cref="getEndLine">
- /// </seealso>
- int GetLine();
-
- /// <summary> Returns the column number of the last character for current token (being
- /// matched after the last call to BeginTOken).
- /// </summary>
- int GetEndColumn();
-
- /// <summary> Returns the line number of the last character for current token (being
- /// matched after the last call to BeginTOken).
- /// </summary>
- int GetEndLine();
-
- /// <summary> Returns the column number of the first character for current token (being
- /// matched after the last call to BeginTOken).
- /// </summary>
- int GetBeginColumn();
-
- /// <summary> Returns the line number of the first character for current token (being
- /// matched after the last call to BeginTOken).
- /// </summary>
- int GetBeginLine();
-
- /// <summary> Backs up the input stream by amount steps. Lexer calls this method if it
- /// had already read some characters, but could not use them to match a
- /// (longer) token. So, they will be used again as the prefix of the next
- /// token and it is the implemetation's responsibility to do this right.
- /// </summary>
- void Backup(int amount);
-
- /// <summary> Returns the next character that marks the beginning of the next token.
- /// All characters must remain in the buffer between two successive calls
- /// to this method to implement backup correctly.
- /// </summary>
- char BeginToken();
-
- /// <summary> Returns a string made up of characters from the marked token beginning
- /// to the current buffer position. Implementations have the choice of returning
- /// anything that they want to. For example, for efficiency, one might decide
- /// to just return null, which is a valid implementation.
- /// </summary>
- System.String GetImage();
-
- /// <summary> Returns an array of characters that make up the suffix of length 'len' for
- /// the currently matched token. This is used to build up the matched string
- /// for use in actions in the case of MORE. A simple and inefficient
- /// implementation of this is as follows :
- ///
- /// {
- /// String t = GetImage();
- /// return t.substring(t.length() - len, t.length()).toCharArray();
- /// }
- /// </summary>
- char[] GetSuffix(int len);
-
- /// <summary> The lexer calls this function to indicate that it is done with the stream
- /// and hence implementations can free any resources held by this class.
- /// Again, the body of this function can be just empty and it will not
- /// affect the lexer's operation.
- /// </summary>
- void Done();
- }
- }