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Diffstat (limited to 'libjava/classpath/java/text/Bidi.java')
| -rw-r--r-- | libjava/classpath/java/text/Bidi.java | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/libjava/classpath/java/text/Bidi.java b/libjava/classpath/java/text/Bidi.java new file mode 100644 index 00000000000..57b9a88dfa7 --- /dev/null +++ b/libjava/classpath/java/text/Bidi.java @@ -0,0 +1,78 @@ +/* Bidi.java -- Bidirectional Algorithm implementation + Copyright (C) 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.text; + +/** + * Bidirectional Algorithm implementation. + * + * TODO/FIXME Only one method <code>requiresBidi</code> is implemented + * for now by using <code>Character</code>. The full algorithm is <a + * href="http://www.unicode.org/unicode/reports/tr9/">Unicode Standard + * Annex #9: The Bidirectional Algorithm</a>. A full implementation is + * <a href="http://fribidi.org/">GNU FriBidi</a>. + */ +public class Bidi +{ + /** + * Returns false if all characters in the text between start and end + * are all left-to-right text. This implementation is just calls + * <code>Character.getDirectionality(char)</code> on all characters + * and makes sure all characters are either explicitly left-to-right + * or neutral in directionality (character types L, EN, ES, ET, AN, + * CS, S and WS). + */ + public static boolean requiresBidi(char[] text, int start, int end) + { + for (int i = start; i < end; i++) + { + byte dir = Character.getDirectionality(text[i]); + if (dir != Character.DIRECTIONALITY_LEFT_TO_RIGHT + && dir != Character.DIRECTIONALITY_EUROPEAN_NUMBER + && dir != Character.DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR + && dir != Character.DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR + && dir != Character.DIRECTIONALITY_ARABIC_NUMBER + && dir != Character.DIRECTIONALITY_COMMON_NUMBER_SEPARATOR + && dir != Character.DIRECTIONALITY_SEGMENT_SEPARATOR + && dir != Character.DIRECTIONALITY_WHITESPACE) + return true; + } + + return false; + } +} |