Public Member Functions | |
| abstract char | readChar () throws java.io.IOException |
| abstract int | getColumn () |
| abstract int | getLine () |
| abstract int | getEndColumn () |
| abstract int | getEndLine () |
| abstract int | getBeginColumn () |
| abstract int | getBeginLine () |
| abstract void | backup (int amount) |
| abstract char | BeginToken () throws java.io.IOException |
| abstract String | GetImage () |
| abstract char[] | GetSuffix (int len) |
| abstract void | Done () |
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.
| abstract void org.exolab.castor.xml.dtd.parser.CharStream.backup | ( | int | amount | ) | [pure virtual] |
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.
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
Referenced by org.exolab.castor.xml.dtd.parser.DTDParserTokenManager.getNextToken(), and org.exolab.castor.xml.dtd.parser.DTDInitialParserTokenManager.getNextToken().
| abstract char org.exolab.castor.xml.dtd.parser.CharStream.BeginToken | ( | ) | throws java.io.IOException [pure virtual] |
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.
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
Referenced by org.exolab.castor.xml.dtd.parser.DTDParserTokenManager.getNextToken(), and org.exolab.castor.xml.dtd.parser.DTDInitialParserTokenManager.getNextToken().
| abstract void org.exolab.castor.xml.dtd.parser.CharStream.Done | ( | ) | [pure virtual] |
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.
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
| abstract int org.exolab.castor.xml.dtd.parser.CharStream.getBeginColumn | ( | ) | [pure virtual] |
Returns the column number of the first character for current token (being matched after the last call to BeginTOken).
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
| abstract int org.exolab.castor.xml.dtd.parser.CharStream.getBeginLine | ( | ) | [pure virtual] |
Returns the line number of the first character for current token (being matched after the last call to BeginTOken).
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
| abstract int org.exolab.castor.xml.dtd.parser.CharStream.getColumn | ( | ) | [pure virtual] |
Returns the column position of the character last read.
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
| abstract int org.exolab.castor.xml.dtd.parser.CharStream.getEndColumn | ( | ) | [pure virtual] |
Returns the column number of the last character for current token (being matched after the last call to BeginTOken).
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
Referenced by org.exolab.castor.xml.dtd.parser.DTDParserTokenManager.getNextToken(), and org.exolab.castor.xml.dtd.parser.DTDInitialParserTokenManager.getNextToken().
| abstract int org.exolab.castor.xml.dtd.parser.CharStream.getEndLine | ( | ) | [pure virtual] |
Returns the line number of the last character for current token (being matched after the last call to BeginTOken).
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
Referenced by org.exolab.castor.xml.dtd.parser.DTDParserTokenManager.getNextToken(), and org.exolab.castor.xml.dtd.parser.DTDInitialParserTokenManager.getNextToken().
| abstract String org.exolab.castor.xml.dtd.parser.CharStream.GetImage | ( | ) | [pure virtual] |
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.
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
Referenced by org.exolab.castor.xml.dtd.parser.DTDParserTokenManager.getNextToken(), and org.exolab.castor.xml.dtd.parser.DTDInitialParserTokenManager.getNextToken().
| abstract int org.exolab.castor.xml.dtd.parser.CharStream.getLine | ( | ) | [pure virtual] |
Returns the line number of the character last read.
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
| abstract char [] org.exolab.castor.xml.dtd.parser.CharStream.GetSuffix | ( | int | len | ) | [pure virtual] |
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();
}
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
| abstract char org.exolab.castor.xml.dtd.parser.CharStream.readChar | ( | ) | throws java.io.IOException [pure virtual] |
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.
Implemented in org.exolab.castor.xml.dtd.parser.InputCharStream.
Referenced by org.exolab.castor.xml.dtd.parser.DTDParserTokenManager.getNextToken(), and org.exolab.castor.xml.dtd.parser.DTDInitialParserTokenManager.getNextToken().
1.7.0