1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
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22  */
23 
24 /*
25  * @test
26  * @bug 4888843
27  * @summary verify that surrogate pairs representing codepoints with R or AL directionality
28  * and correctly recognized and reordered.
29  */
30 
31 import java.text.Bidi;
32 
33 public class BidiSurrogateTest {
34     private static final String RTLS = new String(Character.toChars(0x10800)); // surrogate code point with R directionality
35     private static final String LTRS = new String(Character.toChars(0x107ff)); // surrogate code point with L directionality
36     private static final String LRE = "\u202a";
37     private static final String RLE = "\u202b";
38     private static final String PDF = "\u202c";
39 
40 
main(String[] args)41     public static void main(String[] args) {
42         new BidiSurrogateTest().test();
43     }
44 
test()45     void test() {
46         test0();
47         test1();
48     }
49 
test0()50     void test0() {
51         // test unpaired surrogates - should have L directionality
52         testRequiresBidi("\ud800", false);           // unpaired lead surrogate
53         testRequiresBidi("\udc00", false);           // unpaired trail surrogate
54         testRequiresBidi("\udc00\ud800", false);     // out of order surrogates
55         testRequiresBidi("a\udc00b\ud800c", false);  // out of order surrogates split
56         testRequiresBidi(LTRS, false);               // supplementary with L
57         testRequiresBidi(RTLS, true);                // supplementary with R
58         testRequiresBidi("a" + RTLS + "b", true);    // R supplementary in LTR text
59         testRequiresBidi(LTRS + RTLS, true);         // R supplementary in LTR supplementary text
60         testRequiresBidi(LRE, false);                // LRE lone embedding
61         testRequiresBidi(RLE, true);                 // RLE lone embedding
62         testRequiresBidi(PDF, false);                // PDF lone pop embedding
63     }
64 
testRequiresBidi(String string, boolean requiresBidi)65     void testRequiresBidi(String string, boolean requiresBidi) {
66         char[] text = string.toCharArray();
67         if (Bidi.requiresBidi(text, 0, text.length) != requiresBidi) {
68             throw new RuntimeException("testRequiresBidi failed with '" + string + "', " + requiresBidi);
69         }
70     }
71 
test1()72     void test1() {
73         // test that strings with surrogate runs process surrogate directionality ok
74         testBidi("This is a string with " + LTRS + " in it.", false);
75         testBidi("This is a string with \ud800 in it.", false);
76         testBidi("This is a string with \u0640 in it.", 22, 1);
77         testBidi(RTLS, true);
78         testBidi("This is a string with " + RTLS + RTLS + RTLS + " in it.", 22, 6);
79     }
80 
testBidi(String string, boolean directionIsRTL)81     void testBidi(String string, boolean directionIsRTL) {
82         Bidi bidi = new Bidi(string, Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
83         if (bidi.isMixed()) {
84             throw new RuntimeException("bidi is mixed");
85         }
86         if (bidi.isRightToLeft() != directionIsRTL) {
87             throw new RuntimeException("bidi is not " + (directionIsRTL ? "rtl" : "ltr"));
88         }
89     }
90 
testBidi(String string, int rtlstart, int rtllength)91     void testBidi(String string, int rtlstart, int rtllength) {
92         Bidi bidi = new Bidi(string, Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);
93         for (int i = 0; i < bidi.getRunCount(); ++i) {
94             if ((bidi.getRunLevel(i) & 1) != 0) {
95                 if (bidi.getRunStart(i) != rtlstart ||
96                     bidi.getRunLimit(i) != rtlstart + rtllength) {
97                     throw new RuntimeException("first rtl run didn't match " + rtlstart + ", " + rtllength);
98                 }
99                 break;
100             }
101         }
102     }
103 }
104