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com.steadystate.css.parser
Class ASCII_CharStream  view ASCII_CharStream download ASCII_CharStream.java

java.lang.Object
  extended bycom.steadystate.css.parser.ASCII_CharStream
All Implemented Interfaces:
CharStream

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).


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

bufsize

int bufsize

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 java.io.Reader inputStream

buffer

private char[] buffer

maxNextCharInd

private int maxNextCharInd

inBuf

private int inBuf
Constructor Detail

ASCII_CharStream

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

ASCII_CharStream

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

ASCII_CharStream

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

ASCII_CharStream

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

ExpandBuff

private final void ExpandBuff(boolean wrapAround)

FillBuff

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

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

UpdateLineColumn

private final void UpdateLineColumn(char c)

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

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

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

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

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

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

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

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

ReInit

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

ReInit

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

ReInit

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

ReInit

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

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

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

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

adjustBeginLineColumn

public void adjustBeginLineColumn(int newLine,
                                  int newCol)
Method to adjust line and column numbers for the start of a token.