java.text.BreakIterator#current ( )源码实例Demo

@Override
public void selectWord(int wordPositionInArea) {
    if(area.getLength() == 0) {
        return;
    }

    BreakIterator breakIterator = BreakIterator.getWordInstance( getArea().getLocale() );
    breakIterator.setText(area.getText());
    breakIterator.preceding(wordPositionInArea);
    breakIterator.next();
    int wordStart = breakIterator.current();

    breakIterator.following(wordPositionInArea);
    breakIterator.next();
    int wordEnd = breakIterator.current();

    selectRange(wordStart, wordEnd);
}
 

/**
 * Bug 4068137
 */
public void TestEndBehavior()
{
    String testString = "boo.";
    BreakIterator wb = BreakIterator.getWordInstance();
    wb.setText(testString);

    if (wb.first() != 0)
        errln("Didn't get break at beginning of string.");
    if (wb.next() != 3)
        errln("Didn't get break before period in \"boo.\"");
    if (wb.current() != 4 && wb.next() != 4)
        errln("Didn't get break at end of string.");
}
 

/**
 * Bug 4068137
 */
public void TestEndBehavior()
{
    String testString = "boo.";
    BreakIterator wb = BreakIterator.getWordInstance();
    wb.setText(testString);

    if (wb.first() != 0)
        errln("Didn't get break at beginning of string.");
    if (wb.next() != 3)
        errln("Didn't get break before period in \"boo.\"");
    if (wb.current() != 4 && wb.next() != 4)
        errln("Didn't get break at end of string.");
}
 

/**
 * Bug 4068137
 */
public void TestEndBehavior()
{
    String testString = "boo.";
    BreakIterator wb = BreakIterator.getWordInstance();
    wb.setText(testString);

    if (wb.first() != 0)
        errln("Didn't get break at beginning of string.");
    if (wb.next() != 3)
        errln("Didn't get break before period in \"boo.\"");
    if (wb.current() != 4 && wb.next() != 4)
        errln("Didn't get break at end of string.");
}
 

/**
 * Bug 4068137
 */
public void TestEndBehavior()
{
    String testString = "boo.";
    BreakIterator wb = BreakIterator.getWordInstance();
    wb.setText(testString);

    if (wb.first() != 0)
        errln("Didn't get break at beginning of string.");
    if (wb.next() != 3)
        errln("Didn't get break before period in \"boo.\"");
    if (wb.current() != 4 && wb.next() != 4)
        errln("Didn't get break at end of string.");
}
 

private void testFirstAndLast(BreakIterator bi, String text, String boundaries) {
  String message = "Text: " + text;
  int current = bi.current();
  assertEquals(message, boundaries.indexOf('^'), current);
  assertEquals(message, current, bi.first());
  assertEquals(message, current, bi.current());
  current = bi.last();
  assertEquals(boundaries.lastIndexOf('^'), current);
  assertEquals(message, current, bi.current());
}
 

/**
 * Returns a string comprised of spaces and '^' only at the boundaries.
 */
private String readBoundariesToString(BreakIterator bi, String text) {
  // init markers to spaces
  StringBuilder markers = new StringBuilder();
  markers.setLength(text.length() + 1);
  for (int k = 0; k < markers.length(); k++) {
    markers.setCharAt(k, ' ');
  }

  bi.setText(text);
  for (int boundary = bi.current(); boundary != BreakIterator.DONE; boundary = bi.next()) {
    markers.setCharAt(boundary, '^');
  }
  return markers.toString();
}
 

/**
 * Bug 4068137
 */
public void TestEndBehavior()
{
    String testString = "boo.";
    BreakIterator wb = BreakIterator.getWordInstance();
    wb.setText(testString);

    if (wb.first() != 0)
        errln("Didn't get break at beginning of string.");
    if (wb.next() != 3)
        errln("Didn't get break before period in \"boo.\"");
    if (wb.current() != 4 && wb.next() != 4)
        errln("Didn't get break at end of string.");
}
 

/**
 * Creates a new spell check iterator.
 *	
 * @param document the document containing the specified partition
 * @param region the region to spell check
 * @param locale the locale to use for spell checking
 * @param breakIterator the break-iterator
 */
public SpellCheckIterator(IDocument document, IRegion region, Locale locale, BreakIterator breakIterator) {
	fOffset= region.getOffset();
	fWordIterator= breakIterator;
	fDelimiter= TextUtilities.getDefaultLineDelimiter(document);

	String content;
	try {

		content= document.get(region.getOffset(), region.getLength());

	} catch (Exception exception) {
		content= ""; //$NON-NLS-1$
	}
	fContent= content;

	fWordIterator.setText(content);
	fPredecessor= fWordIterator.first();
	fSuccessor= fWordIterator.next();

	final BreakIterator iterator= BreakIterator.getSentenceInstance(locale);
	iterator.setText(content);

	int offset= iterator.current();
	while (offset != BreakIterator.DONE) {

		fSentenceBreaks.add(new Integer(offset));
		offset= iterator.next();
	}
}
 

/**
 * @see com.mulgasoft.emacsplus.commands.SexpHandler#getNextPosition(org.eclipse.jface.text.IDocument, java.text.BreakIterator)
 */
@Override
protected int getNextPosition(IDocument document, BreakIterator iter) {
	int pos = iter.current();
	int result = iter.previous();
	if (result != BreakIterator.DONE) {
		result = checkUnder(document,iter,result);			
		result = checkDot(document,pos,result);
	}
	return result;
}
 

/**
 * @see com.mulgasoft.emacsplus.commands.SexpHandler#getNextPosition(org.eclipse.jface.text.IDocument, java.text.BreakIterator)
 */
@Override
protected int getNextPosition(IDocument document, BreakIterator iter) {
	int pos = iter.current();
	int result = iter.next();
	if (result != BreakIterator.DONE) {
		result = checkDot(document,pos,result);
		result = checkUnder(document,result);			
	}
	return result;
}
 

/** Assumes that {@code getArea().getLength != 0} is true and {@link BreakIterator#setText(String)} has been called */
private int calculatePositionViaBreakingForwards(int numOfBreaks, BreakIterator breakIterator, int position) {
    breakIterator.following(position);
    for (int i = 1; i < numOfBreaks; i++) {
        breakIterator.next(numOfBreaks);
    }
    return breakIterator.current();
}
 

/** Assumes that {@code getArea().getLength != 0} is true and {@link BreakIterator#setText(String)} has been called */
private int calculatePositionViaBreakingBackwards(int numOfBreaks, BreakIterator breakIterator, int position) {
    breakIterator.preceding(position);
    for (int i = 1; i < numOfBreaks; i++) {
        breakIterator.previous();
    }
    return breakIterator.current();
}
 

/**
 * Breaks will be at least {@code minLength} apart (to the extent possible),
 * while trying to position the match inside the fragment according to {@code fragmentAlignment}.
 */
public static LengthGoalBreakIterator createMinLength(BreakIterator baseIter, int minLength,
                                                      float fragmentAlignment) {
  return new LengthGoalBreakIterator(baseIter, minLength, fragmentAlignment, true, baseIter.current());
}
 

/**
 * Breaks will be on average {@code targetLength} apart; the closest break to this target (before or after)
 * is chosen. The match will be positioned according to {@code fragmentAlignment} as much as possible.
 */
public static LengthGoalBreakIterator createClosestToLength(BreakIterator baseIter, int targetLength,
                                                            float fragmentAlignment) {
  return new LengthGoalBreakIterator(baseIter, targetLength, fragmentAlignment, false, baseIter.current());
}
 

/** Asserts that two breakiterators break the text the same way */
public static void assertSameBreaks(CharacterIterator one, CharacterIterator two, BreakIterator expected, BreakIterator actual) {
  expected.setText(one);
  actual.setText(two);

  assertEquals(expected.current(), actual.current());

  // next()
  int v = expected.current();
  while (v != BreakIterator.DONE) {
    assertEquals(v = expected.next(), actual.next());
    assertEquals(expected.current(), actual.current());
  }
  
  // first()
  assertEquals(expected.first(), actual.first());
  assertEquals(expected.current(), actual.current());
  // last()
  assertEquals(expected.last(), actual.last());
  assertEquals(expected.current(), actual.current());
  
  // previous()
  v = expected.current();
  while (v != BreakIterator.DONE) {
    assertEquals(v = expected.previous(), actual.previous());
    assertEquals(expected.current(), actual.current());
  }
  
  // following()
  for (int i = one.getBeginIndex(); i <= one.getEndIndex(); i++) {
    expected.first();
    actual.first();
    assertEquals(expected.following(i), actual.following(i));
    assertEquals(expected.current(), actual.current());
  }
  
  // preceding()
  for (int i = one.getBeginIndex(); i <= one.getEndIndex(); i++) {
    expected.last();
    actual.last();
    assertEquals(expected.preceding(i), actual.preceding(i));
    assertEquals(expected.current(), actual.current());
  }
}
 

@Override // to select words containing underscores
public void selectWord()
{
    if ( getLength() == 0 ) return;

    CaretSelectionBind<?,?,?> csb = getCaretSelectionBind();
    int paragraph = csb.getParagraphIndex();
    int position = csb.getColumnPosition(); 
    
    String paragraphText = getText( paragraph );
    BreakIterator breakIterator = BreakIterator.getWordInstance( getLocale() );
    breakIterator.setText( paragraphText );

    breakIterator.preceding( position );
    int start = breakIterator.current();
    
    while ( start > 0 && paragraphText.charAt( start-1 ) == '_' )
    {
        if ( --start > 0 && ! breakIterator.isBoundary( start-1 ) )
        {
            breakIterator.preceding( start );
            start = breakIterator.current();
        }
    }
    
    breakIterator.following( position );
    int end = breakIterator.current();
    int len = paragraphText.length();
    
    while ( end < len && paragraphText.charAt( end ) == '_' )
    {
        if ( ++end < len && ! breakIterator.isBoundary( end+1 ) )
        {
            breakIterator.following( end );
            end = breakIterator.current();
        }
        // For some reason single digits aren't picked up so ....
        else if ( Character.isDigit( paragraphText.charAt( end ) ) )
        {
            end++;
        }
    }
    
    csb.selectRange( paragraph, start, paragraph, end );
}