Java JTextComponent Word selectWordAtCaret(JTextComponent editor)

Description

select Word At Caret

License

Apache License

Declaration

public static void selectWordAtCaret(JTextComponent editor) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import javax.swing.text.BadLocationException;

import javax.swing.text.JTextComponent;

public class Main {
    public static void selectWordAtCaret(JTextComponent editor) {
        int iStart = 0;
        int iEnd = 0;
        try {/*from   w w w  . j  a  va2  s  . c  o  m*/
            int iCaretPos = editor.getCaretPosition();
            iStart = getWordStart(editor, iCaretPos);
            iEnd = getWordEnd(editor, iCaretPos);
        } catch (BadLocationException e) {
            try {
                iEnd = editor.getCaretPosition();
                iStart = getPreviousWord(editor, iEnd);
            } catch (BadLocationException be) {
                // ignore
            }
        }

        if (iStart < iEnd) {
            editor.select(iStart, iEnd);
        }
    }

    public static int getWordStart(JTextComponent editor, int iOffset) throws BadLocationException {
        String text = editor.getText();
        iOffset = maybeAdjustOffsetToNextWord(text, iOffset);

        int iStart = iOffset;
        for (; iStart > 0 && Character.isJavaIdentifierPart(text.charAt(iStart)); iStart--)
            ;
        if (iStart != iOffset) {
            iStart++;
        }
        return iStart;
    }

    public static int getWordEnd(JTextComponent editor, int iOffset) throws BadLocationException {
        String text = editor.getText();
        iOffset = maybeAdjustOffsetToNextWord(text, iOffset);

        int iEnd = iOffset;
        for (; iEnd < text.length() && Character.isJavaIdentifierPart(text.charAt(iEnd)); iEnd++)
            ;
        if (iEnd == iOffset && !Character.isWhitespace(text.charAt(iEnd))) {
            // the word is a single, non-identifier character
            iEnd++;
        }
        return iEnd;
    }

    private static int getPreviousWord(JTextComponent editor, int iOffset) throws BadLocationException {
        String text = editor.getText();
        int iStart = getWordStart(editor, iOffset);
        for (iOffset = iStart - 1; iOffset >= 0 && Character.isWhitespace(text.charAt(iOffset)); iOffset--)
            ;
        if (iOffset < 0) {
            return iStart;
        }
        return getWordStart(editor, iOffset);
    }

    private static int maybeAdjustOffsetToNextWord(String text, int iOffset) throws BadLocationException {
        if (text.length() < iOffset) {
            throw new BadLocationException("Index out of bounds. Offset: " + iOffset + "  Length: " + text.length(),
                    iOffset);
        }

        if (iOffset > 0 && !text.isEmpty()
                && (text.length() == iOffset || Character.isWhitespace(text.charAt(iOffset)))) {
            if (Character.isWhitespace(text.charAt(iOffset - 1))) {
                while (iOffset < text.length()) {
                    if (!Character.isWhitespace(text.charAt(iOffset))) {
                        return iOffset;
                    }
                    iOffset++;
                }
            }
            iOffset--;
        }
        return iOffset;
    }
}

Related

1. getWordEnd(JTextComponent editor, int iOffset)
2. getWordStart(JTextComponent c, int offs)
3. getWordWrappedTextDimension(JTextComponent textComponent, int width)
4. replaceWordAtCaretNice(JTextComponent editor, String strText)
5. searchInTxComp(JTextComponent src, String word)