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make dt detection much simpler and hopefully more maintainable and robust

This commit is contained in:
Martin Rotter 2024-04-16 09:59:16 +02:00
parent 86eaa3f965
commit 9351d63cbe
3 changed files with 49 additions and 61 deletions
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2
src/librssguard/gui/settings/settingsfeedsmessages.cpp
View File

@ -232,7 +232,7 @@ QIcon SettingsFeedsMessages::icon() const {
}
void SettingsFeedsMessages::initializeMessageDateFormats() {
QStringList patterns = TextFactory::dateTimePatterns();
QStringList patterns = TextFactory::dateTimePatterns(false);
m_ui->m_cmbMessagesDateTimeFormat->addItems(patterns);
m_ui->m_cmbMessagesTimeFormat->addItems(patterns);

105
src/librssguard/miscellaneous/textfactory.cpp
View File

@ -81,71 +81,40 @@ bool TextFactory::couldBeHtml(const QString& string) {
}
QDateTime TextFactory::parseDateTime(const QString& date_time, QString* used_dt_format) {
const QString input_date = date_time.simplified();
QString input_date = date_time.simplified().replace(QSL("GMT"), QSL("UTC"));
if (input_date.isEmpty()) {
return QDateTime();
}
QDateTime dt;
QTime time_zone_offset;
const QLocale locale(QLocale::Language::C);
bool positive_time_zone_offset = false;
static QStringList date_patterns = dateTimePatterns(true);
static QStringList date_patterns = dateTimePatterns();
static QStringList timezone_offset_patterns = tzOffsetPatterns();
// QDateTime dt1 = locale.toDateTime("GMT", "t");
// QString dt2 = dt1.toString();
// Iterate over patterns and check if input date/time matches the pattern.
for (const QString& pattern : std::as_const(date_patterns)) {
QString input_date_chopped = input_date.left(pattern.size());
#if QT_VERSION >= 0x060700 // Qt >= 6.7.0
dt = locale.toDateTime(input_date_chopped, pattern, 2000);
dt = locale.toDateTime(input_date, pattern, 2000);
#else
dt = locale.toDateTime(input_date_chopped, pattern);
dt = locale.toDateTime(input_date, pattern);
#endif
if (dt.isValid()) {
// Make sure that this date/time is considered UTC.
dt.setTimeSpec(Qt::TimeSpec::UTC);
dt = dt.toUTC();
if (used_dt_format != nullptr) {
used_dt_format->clear();
used_dt_format->append(pattern);
}
// We find offset from UTC.
if (input_date.size() >= TIMEZONE_OFFSET_LIMIT) {
QString offset_sanitized = input_date.mid(pattern.size()).replace(QL1S(" "), QString());
for (const QString& pattern_t : std::as_const(timezone_offset_patterns)) {
time_zone_offset = QTime::fromString(offset_sanitized.left(pattern_t.size()), pattern_t);
if (time_zone_offset.isValid()) {
positive_time_zone_offset = pattern_t.at(0) == QL1C('+');
break;
}
}
}
if (time_zone_offset.isValid()) {
// Time zone offset was detected.
if (positive_time_zone_offset) {
// Offset is positive, so we have to subtract it to get
// the original UTC.
return dt.addSecs(-QTime(0, 0, 0, 0).secsTo(time_zone_offset));
}
else {
// Vice versa.
return dt.addSecs(QTime(0, 0, 0, 0).secsTo(time_zone_offset));
}
}
else {
return dt;
}
return dt;
}
}
// Parsing failed, return invalid datetime.
qCriticalNN << LOGSEC_CORE << "Date/time string NOT recognized:" << QUOTE_W_SPACE_DOT(input_date);
return QDateTime();
}
@ -153,29 +122,49 @@ QDateTime TextFactory::parseDateTime(qint64 milis_from_epoch) {
return QDateTime::fromMSecsSinceEpoch(milis_from_epoch, Qt::TimeSpec::UTC);
}
QStringList TextFactory::dateTimePatterns() {
QStringList TextFactory::dateTimePatterns(bool with_tzs) {
QStringList pat;
pat << QSL("yyyy-MM-ddTHH:mm:ss") << QSL("MMM dd yyyy hh:mm:ss") << QSL("MMM d yyyy hh:mm:ss")
<< QSL("ddd, dd MMM yyyy HH:mm:ss") << QSL("ddd, dd MMM yy HH:mm:ss") << QSL("ddd, dd MMM yyyy HH:mm")
<< QSL("ddd, d MMM yyyy HH:mm:ss") << QSL("dd MMM yyyy hh:mm:ss") << QSL("dd MMM yyyy")
<< QSL("yyyy-MM-dd HH:mm:ss.z") << QSL("yyyy-MM-ddThh:mm:ss") << QSL("yyyy-MM-ddThh:mm") << QSL("yyyy-MM-dd")
<< QSL("yyyy-MM-dd") << QSL("yyyy-MM") << QSL("d MMM yyyy HH:mm:ss") << QSL("yyyyMMddThhmmss") << QSL("yyyyMMdd")
<< QSL("yyyy") << QSL("hh:mm:ss") << QSL("h:m:s AP") << QSL("h:mm") << QSL("H:mm") << QSL("h:m") << QSL("h.m");
pat << QSL("yyyy-MM-ddTHH:mm:ss");
pat << QSL("yyyy-MM-ddThh:mm:ss");
pat << QSL("yyyy-MM-dd HH:mm:ss.z");
pat << QSL("yyyy-MM-ddThh:mm");
pat << QSL("yyyyMMddThhmmss");
pat << QSL("yyyyMMdd");
pat << QSL("yyyy");
pat << QSL("yyyy-MM-dd");
pat << QSL("yyyy-MM");
auto std_pat = boolinq::from(pat.begin(), pat.end())
.orderBy([](const QString& str) {
return str.size() * -1;
})
.toStdList();
pat << QSL("MMM dd yyyy hh:mm:ss");
pat << QSL("MMM d yyyy hh:mm:ss");
return FROM_STD_LIST(QStringList, std_pat);
}
pat << QSL("ddd, dd MMM yyyy HH:mm:ss");
pat << QSL("ddd, dd MMM yyyy HH:mm");
pat << QSL("ddd, dd MMM yy HH:mm:ss");
pat << QSL("ddd, d MMM yyyy HH:mm:ss");
QStringList TextFactory::tzOffsetPatterns() {
QStringList pat;
// Thu, 07 Mar 2024 01 : 12 : 13 GMT
pat << QSL("+hh:mm") << QSL("-hh:mm") << QSL("+hhmm") << QSL("-hhmm") << QSL("+hh") << QSL("-hh");
pat << QSL("dd MMM yyyy hh:mm:ss");
pat << QSL("dd MMM yyyy");
pat << QSL("d MMM yyyy HH:mm:ss");
pat << QSL("hh:mm:ss");
pat << QSL("h:m:s");
pat << QSL("h:mm");
pat << QSL("H:mm");
pat << QSL("h:m");
pat << QSL("h.m");
if (with_tzs) {
for (int i = 0; i < pat.size(); i += 3) {
QString base_pattern = pat.value(i);
pat.insert(i + 1, base_pattern + QSL("t"));
pat.insert(i + 2, base_pattern + QSL(" t"));
}
}
return pat;
}

3
src/librssguard/miscellaneous/textfactory.h
View File

@ -31,8 +31,7 @@ class RSSGUARD_DLLSPEC TextFactory {
// Converts 1970-epoch miliseconds to date/time.
// NOTE: This method tries to always return time in UTC.
static QDateTime parseDateTime(qint64 milis_from_epoch);
static QStringList dateTimePatterns();
static QStringList tzOffsetPatterns();
static QStringList dateTimePatterns(bool with_tzs);
static QString encrypt(const QString& text, quint64 key = 0);
static QString decrypt(const QString& text, quint64 key = 0);
static QString newline();