Package de.jplag.c

Class JavaCharStream

java.lang.Object

de.jplag.c.AbstractCharStream

de.jplag.c.JavaCharStream

All Implemented Interfaces:

CharStream

public class JavaCharStream
extends AbstractCharStream

An implementation of interface CharStream, where the stream is assumed to contain only ASCII characters (with java-like unicode escape processing).

Field Summary

Fields

Modifier and Type	Field	Description
protected static final int	NEXTCHAR_BUF_SIZE	Predefined buffer size

Fields inherited from class de.jplag.c.AbstractCharStream

available, buffer, bufpos, bufsize, DEFAULT_BUF_SIZE, inBuf, maxNextCharInd, tokenBegin

Constructor Summary

Constructors

Constructor	Description
JavaCharStream(InputStream dstream, String encoding)	Constructor.
JavaCharStream(InputStream dstream, String encoding, int startline, int startcolumn)	Constructor.
JavaCharStream(InputStream dstream, String encoding, int startline, int startcolumn, int buffersize)	Constructor.
JavaCharStream(Reader dstream)	Constructor.
JavaCharStream(Reader dstream, int startline, int startcolumn)	Constructor.
JavaCharStream(Reader dstream, int startline, int startcolumn, int buffersize)	Constructor.

Method Summary

Modifier and Type	Method	Description
char	beginToken()
void	done()	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.
protected void	fillBuff()
char	readChar()	Get the next character from the selected input.
void	reInit(InputStream dstream, String encoding)	Reinitialise.
void	reInit(InputStream dstream, String encoding, int startline, int startcolumn)	Reinitialise.
void	reInit(InputStream dstream, String encoding, int startline, int startcolumn, int buffersize)	Reinitialise.
void	reInit(Reader dstream)	Reinitialise.
void	reInit(Reader dstream, int startline, int startcolumn)	Reinitialise.
void	reInit(Reader dstream, int startline, int startcolumn, int buffersize)	Reinitialise.
protected void	streamClose()	Close the underlying stream.
protected int	streamRead(char[] buffer, int offset, int len)	Read from the underlying stream.

Methods inherited from class de.jplag.c.AbstractCharStream

adjustBeginLineColumn, backup, expandBuff, getBeginColumn, getBeginLine, getBufSizeAfterExpansion, getColumn, getEndColumn, getEndLine, getImage, getLine, getSuffix, getTabSize, internalAdjustBuffSize, internalSetBufLineColumn, internalUpdateLineColumn, isTrackLineColumn, reInit, setTabSize, setTrackLineColumn

Methods inherited from class java.lang.Object

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

Field Details

NEXTCHAR_BUF_SIZE

protected static final int NEXTCHAR_BUF_SIZE

Predefined buffer size

See Also:

• Constant Field Values

Constructor Details

JavaCharStream

public JavaCharStream(Reader dstream,
 int startline,
 int startcolumn,
 int buffersize)

Constructor.

JavaCharStream

public JavaCharStream(Reader dstream,
 int startline,
 int startcolumn)

Constructor.

JavaCharStream

public JavaCharStream(Reader dstream)

Constructor.

JavaCharStream

public JavaCharStream(InputStream dstream,
 String encoding,
 int startline,
 int startcolumn,
 int buffersize)
               throws UnsupportedEncodingException

Constructor.

Throws:

UnsupportedEncodingException

JavaCharStream

public JavaCharStream(InputStream dstream,
 String encoding,
 int startline,
 int startcolumn)
               throws UnsupportedEncodingException

Constructor.

Throws:

UnsupportedEncodingException

JavaCharStream

public JavaCharStream(InputStream dstream,
 String encoding)
               throws UnsupportedEncodingException

Constructor.

Throws:

UnsupportedEncodingException

Method Details

streamRead

protected int streamRead(char[] buffer,
 int offset,
 int len)
                  throws IOException

Description copied from class: AbstractCharStream

Read from the underlying stream.

Specified by:

streamRead in class AbstractCharStream

Parameters:

buffer - the buffer to be filled

offset - The offset into the buffer. 0-based

len - Number of chars to read.

Returns:

Number of effective chars read, or -1 on error.

Throws:

IOException

streamClose

protected void streamClose()
                    throws IOException

Description copied from class: AbstractCharStream

Close the underlying stream.

Specified by:

streamClose in class AbstractCharStream

Throws:

IOException - If closing fails.

fillBuff

protected void fillBuff()
                 throws IOException

Overrides:

fillBuff in class AbstractCharStream

Throws:

IOException

beginToken

public char beginToken()
                throws IOException

Specified by:

beginToken in interface CharStream

Overrides:

beginToken in class AbstractCharStream

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.

Throws:

IOException

readChar

public char readChar()
              throws IOException

Description copied from interface: CharStream

Get the next character from the selected input. The method of selecting the input is the responsibility of the class implementing this interface.

Specified by:

readChar in interface CharStream

Overrides:

readChar in class AbstractCharStream

Returns:

the next character from the selected input

Throws:

IOException - on IO error

reInit

public void reInit(Reader dstream)

Reinitialise.

reInit

public void reInit(Reader dstream,
 int startline,
 int startcolumn)

Reinitialise.

reInit

public void reInit(Reader dstream,
 int startline,
 int startcolumn,
 int buffersize)

Reinitialise.

reInit

public void reInit(InputStream dstream,
 String encoding)
            throws UnsupportedEncodingException

Reinitialise.

Throws:

UnsupportedEncodingException

reInit

public void reInit(InputStream dstream,
 String encoding,
 int startline,
 int startcolumn)
            throws UnsupportedEncodingException

Reinitialise.

Throws:

UnsupportedEncodingException

reInit

public void reInit(InputStream dstream,
 String encoding,
 int startline,
 int startcolumn,
 int buffersize)
            throws UnsupportedEncodingException

Reinitialise.

Throws:

UnsupportedEncodingException

done

public void done()

Description copied from interface: CharStream

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.

Specified by:

done in interface CharStream

Overrides:

done in class AbstractCharStream