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better rich text detection from Qt::mightBeRichText()

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because Katana uses its own markup for text the first tag may not be valid
HTML tag but there may be valid tags after the first tag

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2023-08-17 18:06:05 +03:00
parent 0c717a4fb8
commit e1f487bd60
1 changed files with 29 additions and 18 deletions
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47
src/core/global/qglobal.cpp
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@ -1919,12 +1919,14 @@ static const qint16 elementsTblSize = 59;
*/
bool Qt::mightBeRichText(const QString& text)
{
if (text.isEmpty())
if (text.isEmpty()) {
return false;
int start = 0;
}
while (start < text.length() && text.at(start).isSpace())
int start = 0;
while (start < text.length() && text.at(start).isSpace()) {
++start;
}
// skip a leading <?xml ... ?> as for example with xhtml
if (text.mid(start, 5) == QLatin1String("<?xml")) {
@ -1938,40 +1940,49 @@ bool Qt::mightBeRichText(const QString& text)
++start;
}
while (start < text.length() && text.at(start).isSpace())
while (start < text.length() && text.at(start).isSpace()) {
++start;
}
}
if (text.mid(start, 5).toLower() == QLatin1String("<!doc"))
if (text.mid(start, 5).toLower() == QLatin1String("<!doc")) {
return true;
}
int open = start;
while (open < text.length() && text.at(open) != QLatin1Char('<')
&& text.at(open) != QLatin1Char('\n')) {
if (text.at(open) == QLatin1Char('&') && text.mid(open+1,3) == QLatin1String("lt;"))
return true; // support desperate attempt of user to see <...>
&& text.at(open) != QLatin1Char('\n')) {
if (text.at(open) == QLatin1Char('&') && text.mid(open+1,3) == QLatin1String("lt;")) {
// support desperate attempt of user to see <...>
return true;
}
++open;
}
if (open < text.length() && text.at(open) == QLatin1Char('<')) {
const int close = text.indexOf(QLatin1Char('>'), open);
if (close > -1) {
int tagstart = text.indexOf(QLatin1Char('<'), start);
while (tagstart > -1) {
const int tagclose = text.indexOf(QLatin1Char('>'), tagstart);
if (tagclose > -1) {
QByteArray tag;
for (int i = open+1; i < close; ++i) {
if (text[i].isDigit() || text[i].isLetter())
for (int i = tagstart+1; i < tagclose; ++i) {
if (text[i].isDigit() || text[i].isLetter()) {
tag += text[i].toLatin1();
else if (!tag.isEmpty() && text[i].isSpace())
} else if (!tag.isEmpty() && text[i].isSpace()) {
break;
else if (!tag.isEmpty() && text[i] == QLatin1Char('/') && i + 1 == close)
} else if (!tag.isEmpty() && text[i] == QLatin1Char('/') && i + 1 == tagclose) {
break;
else if (!text[i].isSpace() && (!tag.isEmpty() || text[i] != QLatin1Char('!')))
return false; // that's not a tag
} else if (!text[i].isSpace() && (!tag.isEmpty() || text[i] != QLatin1Char('!'))) {
// that's not a tag
goto nexttag;
}
}
for (qint16 i = 0; i < elementsTblSize; i++) {
if (qstricmp(tag.constData(), elementsTbl[i]) == 0) {
return true;
}
}
return false;
}
nexttag:
tagstart = text.indexOf(QLatin1Char('<'), tagstart + 1);
}
return false;
}