org.parancoe.yaml.parser
Class ParserReader

java.lang.Object
  org.parancoe.yaml.parser.ParserReader

public final class ParserReader
extends java.lang.Object

A character Reader with some additional functionality.

• nested mark-unmark-reset
• current() returns next character that will be read, without consuming it
• string() returns a string since the last mark
• previous() returns the character before the last one readed

This implementation uses a circular buffer with a default size of 64k. To create a ParserReader from a Reader do:

ParserReader parserReader = ParserReader(reader);

The constructor accepts any reader and returns a new reader with the functions defined here. As of now, this class is not an extension of Reader.

Care has to be taken when using mark(), unmark() and reset(), since they can be nested. Each mark() call has to be matched by exactly one unmark() or reset(). This code is now legal:

 ParserReader r = new ParserReader(reader);
 
 mark(); // position 1
 mark(); // position 2
 reset(); // return to position 2
 if (condition)
     reset(); // return to position 1
 else
     unmark();
 
 

Constructor Summary

ParserReader(java.io.Reader reader)

Method Summary

int	current() return one character from the stream without 'consuming' it
void	mark() remember the current position for a future reset()
int	previous() return the previous character
int	read() read and return one character from the stream.
void	reset() return to the position of a previous mark().
java.lang.String	string() return a string begining at the last mark() untill the current position
void	unmark()
void	unread() unread one character.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ParserReader

public ParserReader(java.io.Reader reader)
             throws java.lang.Exception

Throws:

java.lang.Exception

Method Detail

string

public java.lang.String string()

return a string begining at the last mark() untill the current position

read

public int read()
         throws java.io.IOException

read and return one character from the stream.

• If index != fileIndex, read from buffer
• else check if eof has been readed. If so return eof
• else read a new character from the stream

Throws:

java.io.IOException

current

public int current()
            throws java.io.IOException

return one character from the stream without 'consuming' it

Throws:

java.io.IOException

previous

public int previous()

return the previous character

mark

public void mark()

remember the current position for a future reset()

unmark

public void unmark()

reset

public void reset()

return to the position of a previous mark().

unread

public void unread()

unread one character.