package org.eclipse.swt.internal.extension;

import org.eclipse.swt.internal.qt.OS;

public class StringUtil {

	/**

	 * Determines if a given text right to left.

	 * It goes through characters of the text until it finds a

	 * Strong bidirectional character type as defined in the

	 * Unicode specification.

	 *

	 * @param text

	 * @return

	 */

	public static boolean isRightToLeftText(String text) {

		if (text == null || text.length() < 1)

			return false;

		// We search for the first strong bidirectional character type

		// to guess the directionality of the given text.

		for (int i = 0; i < text.length(); i++) {

			int dir = OS.QChar_direction(text.charAt(i));

			switch (dir) {

			//Strong right-to-left unicode directions

			case OS.QCHAR_DIRR://fall through

			case OS.QCHAR_DIRRLE://fall through

			case OS.QCHAR_DIRRLO://fall through

			case OS.QCHAR_DIRAL:

				return true;

			//Strong left-to-right unicode directions

			case OS.QCHAR_DIRL://fall through

			case OS.QCHAR_DIRLRE://fall through

			case OS.QCHAR_DIRLRO:

				return false;

			}

		}

		return false;

	}

}