Java JTextComponent Word getPartialWordBeforePos(JTextComponent editor, int iPos)

Description

get Partial Word Before Pos

License

Apache License

Declaration

public static String getPartialWordBeforePos(JTextComponent editor, int iPos) 

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 String getPartialWordBeforePos(JTextComponent editor, int iPos) {
        try {/*ww w  . j  a v  a 2s .  c  om*/
            int iNonWhitespace = findNonWhitespacePositionBefore(editor.getText(), iPos - 1);
            int iStart = getWordStart(editor, iNonWhitespace);
            return editor.getText(iStart, iPos - iStart).trim();
        } catch (BadLocationException e) {
            return "";
        }
    }

    /**
     * @return the first non-whitespace position in the given script before the given position
     */
    public static int findNonWhitespacePositionBefore(String script, int position) {
        if (position > script.length() - 1) {
            return position;
        }

        while (position > 0) {
            if (!Character.isWhitespace(script.charAt(position))) {
                break;
            }
            position--;
        }
        return position;
    }

    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;
    }

    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. getNextWord(JTextComponent c, int offs)
2. getNextWordInParagraph(JTextComponent c, Element line, int offs, boolean first)
3. getPreviousWord(JTextComponent editor, int iOffset)
4. getWordAtCaret(JTextComponent editor)
5. getWordDimensionAtCaret(JTextComponent editor)
6. getWordDimensionBeforeCaret(JTextComponent editor)