Name: bb33257 Date: 05/15/97


TextBoundary should have the following methods. The first
is for convenience. The second one allows you to make a
performance speedup when selecting words.

    /**
     * Check whether current offset is a boundary
     * @param offset offset in the text to check.
     * @return whether the offset is a boundary.
     */
    public boolean isBoundary(int offset)
    {
     if (offset == 0) return true;
     return following(offset-1) == offset;
    }

    /**
     * Return the first boundary before the specified offset
     * @param offset the offset to start
     * @return int the first boundary before offset
     */
    public int preceding(int offset)
    {
        if (offset < text.getBeginIndex() ||
            offset >= text.getEndIndex())
            throw new IllegalArgumentException(
              "nextBoundaryAt offset out of bounds");
        pos = previousSafePosition(offset);
        int curr = pos;
        int last;
        do {
            last = curr;
            curr = next();
        } while (curr < offset && curr != DONE);
        return last;
    }
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