com.helger.css.parser

Class CSSCharStream

java.lang.Object

com.helger.css.parser.CSSCharStream

All Implemented Interfaces:

CharStream

public final class CSSCharStream
extends Object
implements CharStream

This class is only used internally as the source for the generated parsers.
An implementation of interface CharStream, where the stream is assumed to contain only ASCII characters (with java-like unicode escape processing).

Author:

Philip Helger

Constructor Summary

Constructors

Constructor and Description
CSSCharStream(Reader aReader)

Method Summary

Modifier and Type	Method and Description
void	adjustBeginLineColumn(int nNewLine, int newCol) Method to adjust line and column numbers for the start of a token.
void	backup(int nAmount) Retreat.
char	BeginToken() Returns the next character that marks the beginning of the next token.
void	Done() Set buffers back to null when finished.
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	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).
String	GetImage() Returns a string made up of characters from the marked token beginning to the current buffer position.
char[]	GetSuffix(int len) Returns an array of characters that make up the suffix of length 'len' for the currently matched token.
int	getTabSize()
boolean	getTrackLineColumn()
char	readChar() Read a character.
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

Constructor Detail

CSSCharStream

public CSSCharStream(@Nonnull
                     Reader aReader)

Method Detail

setTabSize

public void setTabSize(int i)

Description copied from interface: CharStream

Set the tab size to use.

Specified by:

setTabSize in interface CharStream

Parameters:

i - spaces per tab

getTabSize

public int getTabSize()

Specified by:

getTabSize in interface CharStream

Returns:

Current tab size.

BeginToken

public 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

Returns:

starting character for token.

Throws:

IOException - from readChar

readChar

public char readChar()
              throws IOException

Read a character.

Specified by:

readChar in interface CharStream

Returns:

The read character

Throws:

IOException - if an I/O error occurs

getEndColumn

public 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

Returns:

end column.

getEndLine

public 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

Returns:

end line.

getBeginColumn

public 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

Returns:

column of token start

getBeginLine

public 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

Returns:

line number of token start

backup

public void backup(int nAmount)

Retreat.

Specified by:

backup in interface CharStream

GetImage

public 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

Returns:

token image as String

GetSuffix

public 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

Returns:

suffix

Done

public void Done()

Set buffers back to null when finished.

Specified by:

Done in interface CharStream

adjustBeginLineColumn

public void adjustBeginLineColumn(int nNewLine,
                                  int newCol)

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

Parameters:

nNewLine - line index

newCol - column index

getTrackLineColumn

public boolean getTrackLineColumn()

Specified by:

getTrackLineColumn in interface CharStream

Returns:

true if line number and column numbers should be tracked.

setTrackLineColumn

public void setTrackLineColumn(boolean tlc)

Description copied from interface: CharStream

Enable or disable line number and column number tracking.

Specified by:

setTrackLineColumn in interface CharStream

Parameters:

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