fr.umlv.tatoo.runtime.buffer.impl
Class CharBufferWrapper

java.lang.Object
  fr.umlv.tatoo.runtime.buffer.impl.AbstractBufferWrapper
      fr.umlv.tatoo.runtime.buffer.impl.CharBufferWrapper

All Implemented Interfaces:

LexerBuffer, TokenBuffer<CharBuffer>

public class CharBufferWrapper
extends AbstractBufferWrapper
implements TokenBuffer<CharBuffer>

A CharBufferWrapper wraps a CharBuffer in order to allow a lexer to process its content in order to have its tokens extracted.

Author:

Julien

See Also:

Lexer

Constructor Summary

CharBufferWrapper(CharBuffer buffer, LocationTracker tracker)
Constructs a CharBufferWrapper which wraps specified CharBuffer.

Method Summary

void	compact()
protected void	discardImpl()
void	flip()
int	getTokenEnd()
int	getTokenStart()
boolean	hasRemaining() Returns true if more characters are availables in the buffer.
int	lastChar() Returns last read char or -1 if not available.
protected int	nextImpl() Returns next character in buffer without taking care of locations
boolean	previousWasNewLine() Determines if the last unwinded character was an end of line.
boolean	read() Reads at some bytes from the stream.
protected void	resetImpl() Moves current position back to first non unwinded character without taking care of locations
protected void	restartImpl()
protected void	unwindImpl(int l) Performs unwind operation on buffer without taking care of locations
CharBuffer	view() Provides a view of all available tokens.

Methods inherited from class fr.umlv.tatoo.runtime.buffer.impl.AbstractBufferWrapper

discard, getLocationProvider, locationClear, next, reset, restart, unwind

Methods inherited from class java.lang.Object

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

Methods inherited from interface fr.umlv.tatoo.runtime.buffer.TokenBuffer

discard

Constructor Detail

CharBufferWrapper

public CharBufferWrapper(CharBuffer buffer,
                         LocationTracker tracker)

Constructs a CharBufferWrapper which wraps specified CharBuffer.

Parameters:

buffer - the CharBuffer to wrap

tracker - the location tracker

Method Detail

unwindImpl

protected void unwindImpl(int l)

Description copied from class: AbstractBufferWrapper

Performs unwind operation on buffer without taking care of locations

Specified by:

unwindImpl in class AbstractBufferWrapper

Parameters:

l - the number of characters to unwind

See Also:

LexerBuffer.unwind(int)

resetImpl

protected void resetImpl()

Description copied from class: AbstractBufferWrapper

Moves current position back to first non unwinded character without taking care of locations

Specified by:

resetImpl in class AbstractBufferWrapper

See Also:

LexerBuffer.reset()

previousWasNewLine

public boolean previousWasNewLine()

Description copied from interface: LexerBuffer

Determines if the last unwinded character was an end of line.

Specified by:

previousWasNewLine in interface LexerBuffer

Returns:

true if the last unwinded character was an end of line; false otherwise

hasRemaining

public boolean hasRemaining()

Description copied from interface: LexerBuffer

Returns true if more characters are availables in the buffer. If the end of file has been reached and backtracked by lexer this method must return true.

Specified by:

hasRemaining in interface LexerBuffer

Returns:

true if more characters are availables in the buffer

read

public boolean read()

Description copied from interface: LexerBuffer

Reads at some bytes from the stream. This operation is optionnal and only used by SimpleLexer.run().

Specified by:

read in interface LexerBuffer

Returns:

false at end of stream

nextImpl

protected int nextImpl()

Description copied from class: AbstractBufferWrapper

Returns next character in buffer without taking care of locations

Specified by:

nextImpl in class AbstractBufferWrapper

Returns:

the next character in the buffer

See Also:

LexerBuffer.next()

compact

public void compact()

flip

public void flip()

discardImpl

protected void discardImpl()

Specified by:

discardImpl in class AbstractBufferWrapper

view

public CharBuffer view()

Description copied from interface: TokenBuffer

Provides a view of all available tokens. Tokens are not copied from the buffer and thus may change during lexer process.

Specified by:

view in interface TokenBuffer<CharBuffer>

Returns:

a view of all available tokens

getTokenStart

public int getTokenStart()

getTokenEnd

public int getTokenEnd()

lastChar

public int lastChar()

Description copied from interface: LexerBuffer

Returns last read char or -1 if not available. This method is used for logging and error reporting. This operation is optional since this method can return -1 anytime

Specified by:

lastChar in interface LexerBuffer

Returns:

last read char or -1 if not available

restartImpl

protected void restartImpl()

Specified by:

restartImpl in class AbstractBufferWrapper