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Unicode: fix the grapheme clustering algorithm

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An oversight in the code kept the algorithm in the GB11 state, even if
the codepoint that is being processed wouldn't allow for that (for
instance a sequence of ExtPic, Ext and Any).

Refactor the code of GB11/GB12/GB13 to deal with code points that break
the sequences (falling back to "normal" handling).

Add some manual tests; interestingly enough, the failing cases are not
covered by Unicode's tests, as we now pass the entire test suite.

Amends a794c5e287.

Fixes: QTBUG-94951
Pick-to: 6.1 5.15
Change-Id: If987d5ccf7c6b13de36d049b1b3d88a3c4b6dd00
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Giuseppe D'Angelo 2021-08-22 19:36:49 +02:00
parent ca604964f6
commit d48058f197
2 changed files with 142 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
src/corelib/text/qunicodetools.cpp
View File

@ -165,9 +165,50 @@ static void getGraphemeBreaks(const char16_t *string, qsizetype len, QCharAttrib
QUnicodeTables::GraphemeBreakClass cls = (QUnicodeTables::GraphemeBreakClass) prop->graphemeBreakClass;
bool shouldBreak = GB::shouldBreakBetweenClasses(lcls, cls);
bool handled = false;
switch (state) {
case GB::State::Normal:
break; // will deal with it below
case GB::State::GB11_ExtPicExt:
Q_ASSERT(lcls == QUnicodeTables::GraphemeBreak_Extend);
if (cls == QUnicodeTables::GraphemeBreak_Extend) {
// keep going in the current state
Q_ASSERT(!shouldBreak); // GB9, do not break before Extend
handled = true;
} else if (cls == QUnicodeTables::GraphemeBreak_ZWJ) {
state = GB::State::GB11_ExtPicExtZWJ;
Q_ASSERT(!shouldBreak); // GB9, do not break before ZWJ
handled = true;
} else {
state = GB::State::Normal;
}
break;
case GB::State::GB11_ExtPicExtZWJ:
Q_ASSERT(lcls == QUnicodeTables::GraphemeBreak_ZWJ);
if (cls == QUnicodeTables::GraphemeBreak_Extended_Pictographic) {
shouldBreak = false;
handled = true;
}
state = GB::State::Normal;
break;
case GB::State::GB12_13_RI:
Q_ASSERT(lcls == QUnicodeTables::GraphemeBreak_RegionalIndicator);
if (cls == QUnicodeTables::GraphemeBreak_RegionalIndicator) {
shouldBreak = false;
handled = true;
}
state = GB::State::Normal;
break;
}
if (!handled) {
Q_ASSERT(state == GB::State::Normal);
if (lcls == QUnicodeTables::GraphemeBreak_Extended_Pictographic) { // GB11
if (cls == QUnicodeTables::GraphemeBreak_Extend) {
state = GB::State::GB11_ExtPicExt;
@ -179,35 +220,6 @@ static void getGraphemeBreaks(const char16_t *string, qsizetype len, QCharAttrib
} else if (cls == QUnicodeTables::GraphemeBreak_RegionalIndicator) { // GB12, GB13
state = GB::State::GB12_13_RI;
}
break;
case GB::State::GB11_ExtPicExt:
Q_ASSERT(lcls == QUnicodeTables::GraphemeBreak_Extend);
if (cls == QUnicodeTables::GraphemeBreak_Extend) {
// keep going in the current state
Q_ASSERT(!shouldBreak); // GB9, do not break before Extend
} else if (cls == QUnicodeTables::GraphemeBreak_ZWJ) {
state = GB::State::GB11_ExtPicExtZWJ;
Q_ASSERT(!shouldBreak); // GB9, do not break before ZWJ
}
break;
case GB::State::GB11_ExtPicExtZWJ:
Q_ASSERT(lcls == QUnicodeTables::GraphemeBreak_ZWJ);
if (cls == QUnicodeTables::GraphemeBreak_Extended_Pictographic)
shouldBreak = false;
state = GB::State::Normal;
break;
case GB::State::GB12_13_RI:
Q_ASSERT(lcls == QUnicodeTables::GraphemeBreak_RegionalIndicator);
if (cls == QUnicodeTables::GraphemeBreak_RegionalIndicator)
shouldBreak = false;
state = GB::State::Normal;
break;
}
if (shouldBreak)

101
tests/auto/corelib/text/qtextboundaryfinder/tst_qtextboundaryfinder.cpp
View File

@ -51,6 +51,9 @@ private slots:
void lineBoundariesDefault();
#endif
void graphemeBoundaries_manual_data();
void graphemeBoundaries_manual();
void wordBoundaries_manual_data();
void wordBoundaries_manual();
void sentenceBoundaries_manual_data();
@ -286,6 +289,104 @@ void tst_QTextBoundaryFinder::lineBoundariesDefault()
}
#endif // QT_BUILD_INTERNAL
void tst_QTextBoundaryFinder::graphemeBoundaries_manual_data()
{
QTest::addColumn<QString>("testString");
QTest::addColumn<QList<int>>("expectedBreakPositions");
{
// QTBUG-94951
QChar s[] = { QChar(0x2764), // U+2764 HEAVY BLACK HEART
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0xD83D), QChar(0xDCF2), // U+1F4F2 MOBILE PHONE WITH RIGHTWARDS ARROW AT LEFT
QChar(0xD83D), QChar(0xDCE9), // U+1F4E9 ENVELOPE WITH DOWNWARDS ARROW ABOVE
};
QString testString(s, sizeof(s)/sizeof(s[0]));
QList<int> expectedBreakPositions{0, 2, 4, 6};
QTest::newRow("+EXTPICxEXT+EXTPIC+EXTPIC+") << testString << expectedBreakPositions;
}
{
QChar s[] = { QChar(0x2764), // U+2764 HEAVY BLACK HEART
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0x2764), // U+2764 HEAVY BLACK HEART
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
};
QString testString(s, sizeof(s)/sizeof(s[0]));
QList<int> expectedBreakPositions{0, 2, 4};
QTest::newRow("+EXTPICxEXT+EXTPICxEXT+") << testString << expectedBreakPositions;
}
{
QChar s[] = { QChar(0x2764), // U+2764 HEAVY BLACK HEART
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0x2764), // U+2764 HEAVY BLACK HEART
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
};
QString testString(s, sizeof(s)/sizeof(s[0]));
QList<int> expectedBreakPositions{0, 4, 7};
QTest::newRow("+EXTPICxEXTxEXTxEXT+EXTPICxEXTxEXT+") << testString << expectedBreakPositions;
}
{
QChar s[] = { QChar(0x2764), // U+2764 HEAVY BLACK HEART
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0x200D), // U+200D ZERO WIDTH JOINER
QChar(0xD83D), QChar(0xDCF2), // U+1F4F2 MOBILE PHONE WITH RIGHTWARDS ARROW AT LEFT
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
};
QString testString(s, sizeof(s)/sizeof(s[0]));
QList<int> expectedBreakPositions{0, 7};
QTest::newRow("+EXTPICxEXTxEXTxZWJxEXTPICxEXTxEXT+") << testString << expectedBreakPositions;
}
{
QChar s[] = { QChar(0x2764), // U+2764 HEAVY BLACK HEART
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0x200D), // U+200D ZERO WIDTH JOINER
QChar(0x0041), // U+0041 LATIN CAPITAL LETTER A
QChar(0xD83D), QChar(0xDCF2), // U+1F4F2 MOBILE PHONE WITH RIGHTWARDS ARROW AT LEFT
};
QString testString(s, sizeof(s)/sizeof(s[0]));
QList<int> expectedBreakPositions{0, 4, 5, 7};
QTest::newRow("+EXTPICxEXTxEXTxZWJ+Any+EXTPIC+") << testString << expectedBreakPositions;
}
{
QChar s[] = { QChar(0x2764), // U+2764 HEAVY BLACK HEART
QChar(0xFE0F), // U+FE0F VARIATION SELECTOR-16
QChar(0xD83C), QChar(0xDDEA), // U+1F1EA REGIONAL INDICATOR SYMBOL LETTER E
QChar(0xD83C), QChar(0xDDFA), // U+1F1FA REGIONAL INDICATOR SYMBOL LETTER U
QChar(0xD83C), QChar(0xDDEA), // U+1F1EA REGIONAL INDICATOR SYMBOL LETTER E
QChar(0xD83C), QChar(0xDDFA), // U+1F1FA REGIONAL INDICATOR SYMBOL LETTER U
QChar(0xD83C), QChar(0xDDEA), // U+1F1EA REGIONAL INDICATOR SYMBOL LETTER E
QChar(0x0041), // U+0041 LATIN CAPITAL LETTER A
};
QString testString(s, sizeof(s)/sizeof(s[0]));
QList<int> expectedBreakPositions{0, 2, 6, 10, 12, 13};
QTest::newRow("+EXTPICxEXT+RIxRI+RIxRI+RI+ANY+") << testString << expectedBreakPositions;
}
}
void tst_QTextBoundaryFinder::graphemeBoundaries_manual()
{
QFETCH(QString, testString);
QFETCH(QList<int>, expectedBreakPositions);
doTestData(testString, expectedBreakPositions, QTextBoundaryFinder::Grapheme);
}
void tst_QTextBoundaryFinder::wordBoundaries_manual_data()
{
QTest::addColumn<QString>("testString");