nu.validator.htmlparser.extra

Class NormalizationChecker

java.lang.Object

nu.validator.htmlparser.extra.NormalizationChecker

All Implemented Interfaces:

CharacterHandler

public final class NormalizationChecker
extends java.lang.Object
implements CharacterHandler

Version:

$Id$

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	alreadyComplainedAboutThisRun Indicates whether the current run has already caused an error.
private boolean	atStartOfRun Indicates whether the checker the next call to characters() is the first call in a run.
private char[]	buf A buffer for holding sequences overlap the SAX buffer boundary.
private char[]	bufHolder A holder for the original buffer (for the memory leak prevention mechanism).
private static com.ibm.icu.text.UnicodeSet	COMPOSING_CHARACTERS A thread-safe set of composing characters as per Charmod Norm.
private org.xml.sax.ErrorHandler	errorHandler
private org.xml.sax.Locator	locator
private int	pos The current used length of the buffer, i.e.

Constructor Summary

Constructors

Constructor and Description
NormalizationChecker(org.xml.sax.Locator locator) Constructor with mode selection.

Method Summary

Modifier and Type	Method and Description
private void	appendToBuf(char[] ch, int start, int end) Appends a slice of an UTF-16 code unit array to the internal buffer.
void	characters(char[] ch, int start, int length) Receive notification of a run of UTF-16 code units.
void	end() Signals the end of the stream.
void	err(java.lang.String message) Emit an error.
private void	errAboutTextRun() Emits an error stating that the current text run or the source text is not in NFC.
private static boolean	isComposingChar(int c) Returns true if the argument is a composing character and false otherwise.
private static boolean	isComposingCharOrSurrogate(char c) Returns true if the argument is a composing BMP character or a surrogate and false otherwise.
void	setErrorHandler(org.xml.sax.ErrorHandler errorHandler)
void	start() Signals the start of the stream.

Methods inherited from class java.lang.Object

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

Field Detail

errorHandler

private org.xml.sax.ErrorHandler errorHandler

locator

private org.xml.sax.Locator locator

COMPOSING_CHARACTERS

private static final com.ibm.icu.text.UnicodeSet COMPOSING_CHARACTERS

A thread-safe set of composing characters as per Charmod Norm.

buf

private char[] buf

A buffer for holding sequences overlap the SAX buffer boundary.

bufHolder

private char[] bufHolder

A holder for the original buffer (for the memory leak prevention mechanism).

pos

private int pos

The current used length of the buffer, i.e. the index of the first slot that does not hold current data.

atStartOfRun

private boolean atStartOfRun

Indicates whether the checker the next call to characters() is the first call in a run.

alreadyComplainedAboutThisRun

private boolean alreadyComplainedAboutThisRun

Indicates whether the current run has already caused an error.

Constructor Detail

NormalizationChecker

public NormalizationChecker(org.xml.sax.Locator locator)

Constructor with mode selection.

Parameters:

sourceTextMode - whether the source text-related messages should be enabled.

Method Detail

err

public void err(java.lang.String message)
         throws org.xml.sax.SAXException

Emit an error. The locator is used.

Parameters:

message - the error message

Throws:

org.xml.sax.SAXException - if something goes wrong

isComposingCharOrSurrogate

private static boolean isComposingCharOrSurrogate(char c)

Returns true if the argument is a composing BMP character or a surrogate and false otherwise.

Parameters:

c - a UTF-16 code unit

Returns:

true if the argument is a composing BMP character or a surrogate and false otherwise

isComposingChar

private static boolean isComposingChar(int c)

Returns true if the argument is a composing character and false otherwise.

Parameters:

c - a Unicode code point

Returns:

true if the argument is a composing character false otherwise

start

public void start()

Description copied from interface: CharacterHandler

Signals the start of the stream. Can be used for setup.

Specified by:

start in interface CharacterHandler

See Also:

CharacterHandler.start()

characters

public void characters(char[] ch,
                       int start,
                       int length)
                throws org.xml.sax.SAXException

Description copied from interface: CharacterHandler

Receive notification of a run of UTF-16 code units.

Specified by:

characters in interface CharacterHandler

Parameters:

ch - the buffer

start - start index in the buffer

length - the number of characters to process starting from start

Throws:

org.xml.sax.SAXException - if things go wrong

See Also:

CharacterHandler.characters(char[], int, int)

errAboutTextRun

private void errAboutTextRun()
                      throws org.xml.sax.SAXException

Emits an error stating that the current text run or the source text is not in NFC.

Throws:

org.xml.sax.SAXException - if the ErrorHandler throws

appendToBuf

private void appendToBuf(char[] ch,
                         int start,
                         int end)

Appends a slice of an UTF-16 code unit array to the internal buffer.

Parameters:

ch - the array from which to copy

start - the index of the first element that is copied

end - the index of the first element that is not copied

end

public void end()
         throws org.xml.sax.SAXException

Description copied from interface: CharacterHandler

Signals the end of the stream. Can be used for cleanup. Doesn't mean that the stream ended successfully.

Specified by:

end in interface CharacterHandler

Throws:

org.xml.sax.SAXException - if things go wrong

See Also:

CharacterHandler.end()

setErrorHandler

public void setErrorHandler(org.xml.sax.ErrorHandler errorHandler)