publicclass BidiSurrogateTest { privatestaticfinal String RTLS = new String(Character.toChars(0x10800)); // surrogate code point with R directionality privatestaticfinal String LTRS = new String(Character.toChars(0x107ff)); // surrogate code point with L directionality privatestaticfinal String LRE = "\u202a"; privatestaticfinal String RLE = "\u202b"; privatestaticfinal String PDF = "\u202c";
publicstaticvoid main(String[] args) { new BidiSurrogateTest().test();
}
void test() {
test0();
test1();
}
void test0() { // test unpaired surrogates - should have L directionality
testRequiresBidi("\ud800", false); // unpaired lead surrogate
testRequiresBidi("\udc00", false); // unpaired trail surrogate
testRequiresBidi("\udc00\ud800", false); // out of order surrogates
testRequiresBidi("a\udc00b\ud800c", false); // out of order surrogates split
testRequiresBidi(LTRS, false); // supplementary with L
testRequiresBidi(RTLS, true); // supplementary with R
testRequiresBidi("a" + RTLS + "b", true); // R supplementary in LTR text
testRequiresBidi(LTRS + RTLS, true); // R supplementary in LTR supplementary text
testRequiresBidi(LRE, false); // LRE lone embedding
testRequiresBidi(RLE, true); // RLE lone embedding
testRequiresBidi(PDF, false); // PDF lone pop embedding
}
void test1() { // test that strings with surrogate runs process surrogate directionality ok
testBidi("This is a string with " + LTRS + " in it.", false);
testBidi("This is a string with \ud800 in it.", false);
testBidi("This is a string with \u0640 in it.", 22, 1);
testBidi(RTLS, true);
testBidi("This is a string with " + RTLS + RTLS + RTLS + " in it.", 22, 6);
}
void testBidi(String string, boolean directionIsRTL) {
Bidi bidi = new Bidi(string, Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT); if (bidi.isMixed()) { thrownew RuntimeException("bidi is mixed");
} if (bidi.isRightToLeft() != directionIsRTL) { thrownew RuntimeException("bidi is not " + (directionIsRTL ? "rtl" : "ltr"));
}
}
void testBidi(String string, int rtlstart, int rtllength) {
Bidi bidi = new Bidi(string, Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT); for (int i = 0; i < bidi.getRunCount(); ++i) { if ((bidi.getRunLevel(i) & 1) != 0) { if (bidi.getRunStart(i) != rtlstart ||
bidi.getRunLimit(i) != rtlstart + rtllength) { thrownew RuntimeException("first rtl run didn't match " + rtlstart + ", " + rtllength);
} break;
}
}
}
}
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