Package org.apache.velocity.runtime.parser

Class VelocityCharStream

java.lang.Object

org.apache.velocity.runtime.parser.VelocityCharStream

All Implemented Interfaces:

CharStream

public final class VelocityCharStream
extends Object
implements CharStream

An implementation of interface CharStream, where the stream is assumed to contain only ASCII characters (without unicode processing).

Field Summary

Fields

Modifier and Type	Field	Description
(package private) int	available
private int[]	bufcolumn
private char[]	buffer
private int[]	bufline
int	bufpos
(package private) int	bufsize
private int	column
private int	inBuf
private Reader	inputStream
private int	line
private int	maxNextCharInd
private int	nextBufExpand
private boolean	prevCharIsCR
private boolean	prevCharIsLF
static final boolean	staticFlag
(package private) int	tokenBegin

Constructor Summary

Constructors

Constructor	Description
VelocityCharStream(InputStream dstream, int startline, int startcolumn)
VelocityCharStream(InputStream dstream, int startline, int startcolumn, int buffersize)
VelocityCharStream(Reader dstream, int startline, int startcolumn)
VelocityCharStream(Reader dstream, int startline, int startcolumn, int buffersize)

Method Summary

Modifier and Type	Method	Description
void	adjustBeginLineColumn(int newLine, int newCol)	Method to adjust line and column numbers for the start of a token.
final void	backup(int amount)	Backs up the input stream by amount steps.
final char	BeginToken()	Returns the next character that marks the beginning of the next token.
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.
private final void	ExpandBuff(boolean wrapAround)
private final void	FillBuff()
final int	getBeginColumn()	Returns the column number of the first character for current token (being matched after the last call to BeginTOken).
final int	getBeginLine()	Returns the line number of the first character for current token (being matched after the last call to BeginTOken).
final int	getColumn()	Deprecated.
final int	getEndColumn()	Returns the column number of the last character for current token (being matched after the last call to BeginTOken).
final int	getEndLine()	Returns the line number of the last character for current token (being matched after the last call to BeginTOken).
final String	GetImage()	Returns a string made up of characters from the marked token beginning to the current buffer position.
final int	getLine()	Deprecated.
final char[]	GetSuffix(int len)	Returns an array of characters that make up the suffix of length 'len' for the currently matched token.
final char	readChar()	Returns the next character from the selected input.
void	ReInit(InputStream dstream, int startline, int startcolumn)
void	ReInit(InputStream dstream, int startline, int startcolumn, int buffersize)
void	ReInit(Reader dstream, int startline, int startcolumn)
void	ReInit(Reader dstream, int startline, int startcolumn, int buffersize)
private final void	UpdateLineColumn(char c)

Methods inherited from class java.lang.Object

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

Field Details

staticFlag

public static final boolean staticFlag

See Also:

• Constant Field Values

bufsize

int bufsize

nextBufExpand

private int nextBufExpand

available

int available

tokenBegin

int tokenBegin

bufpos

public int bufpos

bufline

private int[] bufline

bufcolumn

private int[] bufcolumn

column

private int column

line

private int line

prevCharIsCR

private boolean prevCharIsCR

prevCharIsLF

private boolean prevCharIsLF

inputStream

private Reader inputStream

buffer

private char[] buffer

maxNextCharInd

private int maxNextCharInd

inBuf

private int inBuf

Constructor Details

VelocityCharStream

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

Parameters:

dstream -

startline -

startcolumn -

buffersize -

VelocityCharStream

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

Parameters:

dstream -

startline -

startcolumn -

VelocityCharStream

public VelocityCharStream(InputStream dstream,
 int startline,
 int startcolumn,
 int buffersize)

Parameters:

dstream -

startline -

startcolumn -

buffersize -

VelocityCharStream

public VelocityCharStream(InputStream dstream,
 int startline,
 int startcolumn)

Parameters:

dstream -

startline -

startcolumn -

Method Details

ExpandBuff

private final void ExpandBuff(boolean wrapAround)

FillBuff

private final void FillBuff()
                     throws IOException

Throws:

IOException

BeginToken

public final char BeginToken()
                      throws IOException

Description copied from interface: CharStream

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.

Specified by:

BeginToken in interface CharStream

Throws:

IOException

See Also:

• CharStream.BeginToken()

UpdateLineColumn

private final void UpdateLineColumn(char c)

readChar

public final char readChar()
                    throws IOException

Description copied from interface: CharStream

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.

Specified by:

readChar in interface CharStream

Throws:

IOException

See Also:

• CharStream.readChar()

getColumn

public final int getColumn()

Deprecated.

Description copied from interface: CharStream

Returns the column position of the character last read.

Specified by:

getColumn in interface CharStream

See Also:

• CharStream.getColumn()

getLine

public final int getLine()

Deprecated.

Description copied from interface: CharStream

Returns the line number of the character last read.

Specified by:

getLine in interface CharStream

See Also:

• CharStream.getLine()

getEndColumn

public final int getEndColumn()

Description copied from interface: CharStream

Returns the column number of the last character for current token (being matched after the last call to BeginTOken).

Specified by:

getEndColumn in interface CharStream

See Also:

• CharStream.getEndColumn()

getEndLine

public final int getEndLine()

Description copied from interface: CharStream

Returns the line number of the last character for current token (being matched after the last call to BeginTOken).

Specified by:

getEndLine in interface CharStream

See Also:

• CharStream.getEndLine()

getBeginColumn

public final int getBeginColumn()

Description copied from interface: CharStream

Returns the column number of the first character for current token (being matched after the last call to BeginTOken).

Specified by:

getBeginColumn in interface CharStream

See Also:

• CharStream.getBeginColumn()

getBeginLine

public final int getBeginLine()

Description copied from interface: CharStream

Returns the line number of the first character for current token (being matched after the last call to BeginTOken).

Specified by:

getBeginLine in interface CharStream

See Also:

• CharStream.getBeginLine()

backup

public final void backup(int amount)

Description copied from interface: CharStream

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.

Specified by:

backup in interface CharStream

See Also:

• CharStream.backup(int)

ReInit

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

Parameters:

dstream -

startline -

startcolumn -

buffersize -

ReInit

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

Parameters:

dstream -

startline -

startcolumn -

ReInit

public void ReInit(InputStream dstream,
 int startline,
 int startcolumn,
 int buffersize)

Parameters:

dstream -

startline -

startcolumn -

buffersize -

ReInit

public void ReInit(InputStream dstream,
 int startline,
 int startcolumn)

Parameters:

dstream -

startline -

startcolumn -

GetImage

public final String GetImage()

Description copied from interface: CharStream

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.

Specified by:

GetImage in interface CharStream

See Also:

• CharStream.GetImage()

GetSuffix

public final char[] GetSuffix(int len)

Description copied from interface: CharStream

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(); }

Specified by:

GetSuffix in interface CharStream

See Also:

• CharStream.GetSuffix(int)

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

See Also:

• CharStream.Done()

adjustBeginLineColumn

public void adjustBeginLineColumn(int newLine,
 int newCol)

Method to adjust line and column numbers for the start of a token.

Parameters:

newLine -

newCol -