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com.steadystate.css.parser
Class ASCII_CharStream  

java.lang.Object
  com.steadystate.css.parser.ASCII_CharStream

All Implemented Interfaces:

CharStream

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public final class ASCII_CharStream

extends java.lang.Object

implements CharStream

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

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Field Summary
(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  java.io.Reader	inputStream
private  int	line
private  int	maxNextCharInd
private  boolean	prevCharIsCR
private  boolean	prevCharIsLF
static boolean	staticFlag
(package private)  int	tokenBegin

 

Constructor Summary

ASCII_CharStream(java.io.InputStream dstream, int startline, int startcolumn)

ASCII_CharStream(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)

ASCII_CharStream(java.io.Reader dstream, int startline, int startcolumn)

ASCII_CharStream(java.io.Reader dstream, int startline, int startcolumn, int buffersize)

 

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

 

Methods inherited from class java.lang.Object

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

 

Field Detail

staticFlag

public static final boolean staticFlag

See Also:

Constant Field Values

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bufsize

int bufsize

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available

int available

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tokenBegin

int tokenBegin

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bufpos

public int bufpos

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bufline

private int[] bufline

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bufcolumn

private int[] bufcolumn

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column

private int column

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line

private int line

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prevCharIsCR

private boolean prevCharIsCR

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prevCharIsLF

private boolean prevCharIsLF

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inputStream

private java.io.Reader inputStream

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buffer

private char[] buffer

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maxNextCharInd

private int maxNextCharInd

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inBuf

private int inBuf

Constructor Detail

ASCII_CharStream

public ASCII_CharStream(java.io.Reader dstream,
                        int startline,
                        int startcolumn,
                        int buffersize)

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ASCII_CharStream

public ASCII_CharStream(java.io.Reader dstream,
                        int startline,
                        int startcolumn)

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ASCII_CharStream

public ASCII_CharStream(java.io.InputStream dstream,
                        int startline,
                        int startcolumn,
                        int buffersize)

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ASCII_CharStream

public ASCII_CharStream(java.io.InputStream dstream,
                        int startline,
                        int startcolumn)

Method Detail

ExpandBuff

private final void ExpandBuff(boolean wrapAround)

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FillBuff

private final void FillBuff()
                     throws java.io.IOException

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BeginToken

public final char BeginToken()
                      throws java.io.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

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UpdateLineColumn

private final void UpdateLineColumn(char c)

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readChar

public final char readChar()
                    throws java.io.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

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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

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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

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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

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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

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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

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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

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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

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ReInit

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

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ReInit

public void ReInit(java.io.Reader dstream,
                   int startline,
                   int startcolumn)

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ReInit

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

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ReInit

public void ReInit(java.io.InputStream dstream,
                   int startline,
                   int startcolumn)

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GetImage

public final java.lang.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

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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

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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

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adjustBeginLineColumn

public void adjustBeginLineColumn(int newLine,
                                  int newCol)

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

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> com >> steadystate >> css >> [ parser overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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