Package org.htmlunit.cssparser.parser

Class CssCharStream

java.lang.Object

org.htmlunit.cssparser.parser.CssCharStream

All Implemented Interfaces:

org.htmlunit.cssparser.parser.javacc.CharStream

public final class CssCharStream
extends Object
implements org.htmlunit.cssparser.parser.javacc.CharStream

An implementation of interface CharStream. There is no processing of escaping in this class because the escaping is part of the parser. CSS has some strange rules about that, so processing unicode escapes in this class is too early.

Field Summary

Fields

Modifier and Type	Field	Description
int	bufpos	Position in buffer.
static boolean	staticFlag	Whether parser is static.

Constructor Summary

Constructors

Constructor	Description
CssCharStream(Reader dstream, int startline, int startcolumn)	Constructor.
CssCharStream(Reader dstream, int startline, int startcolumn, int buffersize)	Constructor.

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.
void	backup(int amount)	Backs up the input stream by amount steps.
char	beginToken()	Start.
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.
int	getBeginColumn()	Get token beginning column number.
int	getBeginLine()	Get token beginning line number.
int	getEndColumn()	Get token end column number.
int	getEndLine()	Get token end line number.
String	getImage()	Get token literal value.
char[]	getSuffix(int len)	Get the suffix.
int	getTabSize()
boolean	isTrackLineColumn()
char	readChar()	Get the next character from the selected input.
void	setTabSize(int i)	Set the tab size to use.
void	setTrackLineColumn(boolean tlc)	Enable or disable line number and column number tracking.

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

Whether parser is static.

See Also:

Constant Field Values

bufpos

public int bufpos

Position in buffer.

Constructor Detail

CssCharStream

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

Constructor.

Parameters:

dstream - the stream to read from

startline - startline

startcolumn - startcolumn

buffersize - buffersize

CssCharStream

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

Constructor.

Parameters:

dstream - the stream to read from

startline - startline

startcolumn - startcolumn

Method Detail

beginToken

public final char beginToken()
                      throws IOException

Start.

Specified by:

beginToken in interface org.htmlunit.cssparser.parser.javacc.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.

Throws:

IOException

readChar

public final char readChar()
                    throws IOException

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

Specified by:

readChar in interface org.htmlunit.cssparser.parser.javacc.CharStream

Returns:

the next character from the selected input

Throws:

IOException - on IO error

getEndColumn

public final int getEndColumn()

Get token end column number.

Specified by:

getEndColumn in interface org.htmlunit.cssparser.parser.javacc.CharStream

Returns:

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

getEndLine

public final int getEndLine()

Get token end line number.

Specified by:

getEndLine in interface org.htmlunit.cssparser.parser.javacc.CharStream

Returns:

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

getBeginColumn

public final int getBeginColumn()

Get token beginning column number.

Specified by:

getBeginColumn in interface org.htmlunit.cssparser.parser.javacc.CharStream

Returns:

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

getBeginLine

public final int getBeginLine()

Get token beginning line number.

Specified by:

getBeginLine in interface org.htmlunit.cssparser.parser.javacc.CharStream

Returns:

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

backup

public final void backup(int amount)

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. Backup a number of characters.

Specified by:

backup in interface org.htmlunit.cssparser.parser.javacc.CharStream

Parameters:

amount - Number of chars to back up.

getImage

public final String getImage()

Get token literal value.

Specified by:

getImage in interface org.htmlunit.cssparser.parser.javacc.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.

getSuffix

public final char[] getSuffix(int len)

Get the suffix.

Specified by:

getSuffix in interface org.htmlunit.cssparser.parser.javacc.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();
   }
 

done

public 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. Again, the body of this function can be just empty and it will not affect the lexer's operation. Reset buffer when finished.

Specified by:

done in interface org.htmlunit.cssparser.parser.javacc.CharStream

adjustBeginLineColumn

public void adjustBeginLineColumn(int newLine,
                                  int newCol)

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

Parameters:

newLine - the new line

newCol - the new column

setTabSize

public void setTabSize(int i)

Set the tab size to use.

Specified by:

setTabSize in interface org.htmlunit.cssparser.parser.javacc.CharStream

Parameters:

i - spaces per tab

getTabSize

public int getTabSize()

Specified by:

getTabSize in interface org.htmlunit.cssparser.parser.javacc.CharStream

Returns:

Current tab size.

isTrackLineColumn

public boolean isTrackLineColumn()

Specified by:

isTrackLineColumn in interface org.htmlunit.cssparser.parser.javacc.CharStream

Returns:

true if line number and column numbers should be tracked.

setTrackLineColumn

public void setTrackLineColumn(boolean tlc)

Enable or disable line number and column number tracking.

Specified by:

setTrackLineColumn in interface org.htmlunit.cssparser.parser.javacc.CharStream

Parameters:

tlc - true to track it, false to not do it.