data/ICalTime.cpp
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|---|---|---|---|
| 1 | #include "ICalTime.h" | ||
| 2 | |||
| 3 | #include "RecurrenceRule.h" | ||
| 4 | |||
| 5 | #include <QLoggingCategory> | ||
| 6 | #include <QMutex> | ||
| 7 | #include <QMutexLocker> | ||
| 8 | #include <QRegularExpression> | ||
| 9 | #include <QSet> | ||
| 10 | #include <algorithm> | ||
| 11 | |||
| 12 |
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21 | Q_LOGGING_CATEGORY(lcCalendarTz, "mailjd.calendar.tz") |
| 13 | |||
| 14 | namespace ICalTime { | ||
| 15 | |||
| 16 | namespace { | ||
| 17 | |||
| 18 | struct Transition { | ||
| 19 | 80 | qint64 atUtc = 0; | |
| 20 | 80 | int offsetTo = 0; | |
| 21 |
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80 | bool operator==(const Transition &) const = default; |
| 22 | 219 | bool operator<(const Transition &other) const { return atUtc < other.atUtc; } | |
| 23 | }; | ||
| 24 | |||
| 25 | // "+0100" / "-0530" / "+010000" -> seconds. | ||
| 26 | 38 | bool parseOffset(const QString &text, int *seconds) { | |
| 27 |
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38 | const QString value = text.trimmed(); |
| 28 |
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38 | if (value.size() < 5 || (value.at(0) != QLatin1Char('+') && value.at(0) != QLatin1Char('-'))) |
| 29 | ✗ | return false; | |
| 30 | 38 | bool okHours = false, okMinutes = false, okSeconds = true; | |
| 31 |
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38 | const int hours = value.mid(1, 2).toInt(&okHours); |
| 32 |
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38 | const int minutes = value.mid(3, 2).toInt(&okMinutes); |
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38 | const int extra = value.size() >= 7 ? value.mid(5, 2).toInt(&okSeconds) : 0; |
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38 | if (!okHours || !okMinutes || !okSeconds) |
| 35 | ✗ | return false; | |
| 36 |
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38 | *seconds = (hours * 3600 + minutes * 60 + extra) * (value.at(0) == QLatin1Char('-') ? -1 : 1); |
| 37 | 38 | return true; | |
| 38 | 38 | } | |
| 39 | |||
| 40 | // Transitions a VTIMEZONE defines in [fromYear, toYear]. | ||
| 41 | 11 | QList<Transition> definitionTransitions(const ICal::Component &definition, int fromYear, | |
| 42 | int toYear, int *standardOffset) { | ||
| 43 | 11 | QList<Transition> transitions; | |
| 44 |
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11 | const QDateTime windowStart(QDate(fromYear, 1, 1), QTime(0, 0), QTimeZone::utc()); |
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11 | const QDateTime windowEnd(QDate(toYear, 12, 31), QTime(23, 59, 59), QTimeZone::utc()); |
| 46 |
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30 | for (const ICal::Component &observance : definition.components) { |
| 47 |
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19 | if (observance.name != QLatin1String("STANDARD") && observance.name != QLatin1String("DAYLIGHT")) |
| 48 | ✗ | continue; | |
| 49 | 19 | int from = 0, to = 0; | |
| 50 |
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76 | if (!parseOffset(observance.value(QStringLiteral("TZOFFSETFROM")), &from) || |
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38 | !parseOffset(observance.value(QStringLiteral("TZOFFSETTO")), &to)) |
| 52 | ✗ | continue; | |
| 53 |
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19 | if (observance.name == QLatin1String("STANDARD")) |
| 54 | 11 | *standardOffset = to; | |
| 55 |
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19 | const QString startText = observance.value(QStringLiteral("DTSTART")).trimmed(); |
| 56 | 19 | const QDateTime start = startText.size() == 15 | |
| 57 |
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38 | ? QDateTime::fromString(startText, QStringLiteral("yyyyMMdd'T'HHmmss")) : QDateTime(); |
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19 | if (!start.isValid()) |
| 59 | ✗ | continue; | |
| 60 |
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19 | const QDateTime naiveStart(start.date(), start.time(), QTimeZone::utc()); |
| 61 | 19 | QList<QDateTime> locals; | |
| 62 |
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19 | const QString rruleText = observance.value(QStringLiteral("RRULE")); |
| 63 |
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19 | if (!rruleText.isEmpty()) { |
| 64 |
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16 | const RecurrenceRule rule = RecurrenceRule::parse(rruleText); |
| 65 | // UNTIL in a VTIMEZONE is UTC; compare it on the local wall clock. | ||
| 66 |
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16 | QDateTime until = rule.untilNaive(QTime(23, 59, 59)); |
| 67 |
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16 | if (until.isValid() && rule.untilIsUtc()) |
| 68 | ✗ | until = until.addSecs(from); | |
| 69 |
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16 | locals = expandNaive(rule, naiveStart, windowStart.addDays(-1), windowEnd.addDays(1), until).starts; |
| 70 |
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19 | } else if (naiveStart >= windowStart && naiveStart <= windowEnd) { |
| 71 | ✗ | locals.append(naiveStart); | |
| 72 | } | ||
| 73 |
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19 | for (const ICal::Property &rdate : observance.propertiesNamed(QStringLiteral("RDATE"))) |
| 74 | ✗ | for (const QString &value : ICal::splitValues(rdate.value)) { | |
| 75 | ✗ | QDate date; | |
| 76 | ✗ | QTime time; | |
| 77 | ✗ | if (parseBasicDateTime(QStringView(value).trimmed(), &date, &time)) | |
| 78 | ✗ | locals.append(QDateTime(date, time, QTimeZone::utc())); | |
| 79 | 19 | } | |
| 80 |
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99 | for (const QDateTime &local : locals) { |
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80 | if (local < windowStart || local > windowEnd) |
| 82 | ✗ | continue; | |
| 83 |
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80 | transitions.append({local.toSecsSinceEpoch() - from, to}); |
| 84 | } | ||
| 85 | 19 | } | |
| 86 |
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11 | std::sort(transitions.begin(), transitions.end()); |
| 87 | 11 | return transitions; | |
| 88 | 11 | } | |
| 89 | |||
| 90 | 15 | QList<Transition> zoneTransitions(const QTimeZone &zone, int fromYear, int toYear) { | |
| 91 | 15 | QList<Transition> transitions; | |
| 92 |
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30 | const auto list = zone.transitions(QDateTime(QDate(fromYear, 1, 1), QTime(0, 0), QTimeZone::utc()), |
| 93 |
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45 | QDateTime(QDate(toYear, 12, 31), QTime(23, 59, 59), QTimeZone::utc())); |
| 94 |
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95 | for (const auto &entry : list) |
| 95 |
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80 | transitions.append({entry.atUtc.toSecsSinceEpoch(), entry.offsetFromUtc}); |
| 96 | 15 | return transitions; | |
| 97 | 15 | } | |
| 98 | |||
| 99 | // The part of a Windows/custom TZID that names places, lower case. | ||
| 100 | 11 | QStringList placeWords(const QString &tzid) { | |
| 101 | 11 | QString cleaned = tzid; | |
| 102 |
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11 | cleaned.remove(QRegularExpression(QStringLiteral("\\(UTC[^)]*\\)"))); |
| 103 | 11 | QStringList words; | |
| 104 |
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44 | for (const QString &word : cleaned.split(QRegularExpression(QStringLiteral("[,/\\s]+")), |
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76 | Qt::SkipEmptyParts)) |
| 106 |
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43 | if (word.size() > 2) |
| 107 |
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54 | words.append(word.toLower()); |
| 108 | 11 | return words; | |
| 109 | 11 | } | |
| 110 | |||
| 111 | 11 | QTimeZone matchDefinition(const QString &tzid, const ICal::Component &definition) { | |
| 112 |
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11 | const int year = QDate::currentDate().year(); |
| 113 | 11 | int standardOffset = 0; | |
| 114 |
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11 | const QList<Transition> wanted = definitionTransitions(definition, year - 2, year + 2, &standardOffset); |
| 115 | 15 | const auto matches = [&](const QTimeZone &zone) { | |
| 116 |
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15 | if (!zone.isValid()) |
| 117 | ✗ | return false; | |
| 118 |
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15 | if (wanted.isEmpty()) |
| 119 |
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4 | return zone.standardTimeOffset(QDateTime(QDate(year, 1, 15), QTime(12, 0), QTimeZone::utc())) == |
| 120 |
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6 | standardOffset && |
| 121 |
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4 | zoneTransitions(zone, year - 2, year + 2).isEmpty(); |
| 122 |
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13 | return zoneTransitions(zone, year - 2, year + 2) == wanted; |
| 123 | 11 | }; | |
| 124 |
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11 | const QString location = ICal::unescapeText(definition.value(QStringLiteral("X-LIC-LOCATION"))); |
| 125 |
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11 | if (!location.isEmpty()) { |
| 126 | ✗ | const QTimeZone hinted(location.toUtf8()); | |
| 127 | ✗ | if (matches(hinted)) | |
| 128 | ✗ | return hinted; | |
| 129 | ✗ | } | |
| 130 |
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11 | const QTimeZone system = QTimeZone::systemTimeZone(); |
| 131 | 11 | QList<QTimeZone> candidates; | |
| 132 |
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371 | for (const QByteArray &id : QTimeZone::availableTimeZoneIds(standardOffset)) { |
| 133 |
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360 | if (id.startsWith("Etc/") || !id.contains('/')) |
| 134 | 29 | continue; | |
| 135 |
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331 | candidates.append(QTimeZone(id)); |
| 136 | 11 | } | |
| 137 | // Preference: the system zone, then a zone whose city the TZID names. | ||
| 138 |
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11 | const QStringList words = placeWords(tzid); |
| 139 |
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11 | std::stable_sort(candidates.begin(), candidates.end(), [&](const QTimeZone &a, const QTimeZone &b) { |
| 140 | 2366 | const auto rank = [&](const QTimeZone &zone) { | |
| 141 |
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2366 | if (zone.id() == system.id()) return 0; |
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4708 | const QString city = QString::fromUtf8(zone.id()).section(QLatin1Char('/'), -1).toLower().replace(QLatin1Char('_'), QLatin1Char(' ')); |
| 143 |
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2354 | return words.contains(city) ? 1 : 2; |
| 144 | 2354 | }; | |
| 145 |
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2366 | return rank(a) < rank(b); |
| 146 | }); | ||
| 147 |
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16 | for (const QTimeZone &candidate : candidates) |
| 148 |
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15 | if (matches(candidate)) |
| 149 | 10 | return candidate; | |
| 150 |
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2 | qCWarning(lcCalendarTz) << "No IANA zone matches VTIMEZONE" << tzid |
| 151 |
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1 | << "- using the fixed standard offset" << standardOffset; |
| 152 |
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1 | return QTimeZone(standardOffset); |
| 153 | 11 | } | |
| 154 | |||
| 155 | } // namespace | ||
| 156 | |||
| 157 | // ─── ZoneResolver ────────────────────────────────────────── | ||
| 158 | |||
| 159 | 3670 | ZoneResolver::ZoneResolver(const ICal::Component &calendar) { | |
| 160 |
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4613 | for (const ICal::Component &definition : calendar.componentsNamed(QStringLiteral("VTIMEZONE"))) { |
| 161 |
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943 | const QString id = ICal::unescapeText(definition.value(QStringLiteral("TZID"))).trimmed(); |
| 162 |
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943 | if (!id.isEmpty()) |
| 163 |
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943 | m_definitions.insert(id, definition); |
| 164 | 4613 | } | |
| 165 | 3670 | } | |
| 166 | |||
| 167 | 2910 | QTimeZone ZoneResolver::resolve(const QString &rawTzid) const { | |
| 168 |
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2910 | const QString tzid = rawTzid.trimmed(); |
| 169 |
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2910 | if (tzid.isEmpty()) |
| 170 | 51 | return {}; | |
| 171 |
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2859 | if (const auto cached = m_cache.constFind(tzid); cached != m_cache.constEnd()) |
| 172 | 1257 | return cached.value(); | |
| 173 | 1602 | QTimeZone zone; | |
| 174 | // 1. IANA id, also as the tail of a vendor prefix ("/mozilla.org/…/Europe/Berlin"). | ||
| 175 |
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1602 | const QStringList parts = tzid.split(QLatin1Char('/'), Qt::SkipEmptyParts); |
| 176 |
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3210 | for (int first = 0; first < parts.size() && !zone.isValid(); ++first) { |
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1608 | const QByteArray candidate = parts.mid(first).join(QLatin1Char('/')).toUtf8(); |
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1608 | if (QTimeZone::isTimeZoneIdAvailable(candidate)) |
| 179 |
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1501 | zone = QTimeZone(candidate); |
| 180 | 1608 | } | |
| 181 | // 2. Windows zone names (Outlook/Exchange). | ||
| 182 |
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1602 | if (!zone.isValid()) { |
| 183 |
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101 | const QByteArray iana = QTimeZone::windowsIdToDefaultIanaId(tzid.toUtf8()); |
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101 | if (!iana.isEmpty()) |
| 185 |
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82 | zone = QTimeZone(iana); |
| 186 | 101 | } | |
| 187 | // 3. The resource's own VTIMEZONE definition. | ||
| 188 |
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1602 | if (!zone.isValid()) { |
| 189 | 19 | const auto definition = m_definitions.constFind(tzid); | |
| 190 |
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19 | if (definition != m_definitions.constEnd()) { |
| 191 |
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17 | static QMutex mutex; |
| 192 |
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17 | static QHash<QString, QTimeZone> matched; // definition text -> zone |
| 193 |
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17 | const QString key = tzid + QLatin1Char('\n') + ICal::serialize(definition.value()); |
| 194 | 17 | QMutexLocker locker(&mutex); | |
| 195 |
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17 | if (const auto known = matched.constFind(key); known != matched.constEnd()) { |
| 196 |
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6 | zone = known.value(); |
| 197 | } else { | ||
| 198 |
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11 | zone = matchDefinition(tzid, definition.value()); |
| 199 |
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11 | matched.insert(key, zone); |
| 200 | } | ||
| 201 |
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34 | qCInfo(lcCalendarTz) << "Resolved custom TZID" << tzid << "to" << zone.id(); |
| 202 | 17 | } | |
| 203 | } | ||
| 204 |
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1602 | if (!zone.isValid()) |
| 205 |
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4 | qCWarning(lcCalendarTz) << "Unknown TZID without VTIMEZONE" << tzid << "- treating as floating"; |
| 206 |
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1602 | m_cache.insert(tzid, zone); |
| 207 | 1602 | return zone; | |
| 208 | 2910 | } | |
| 209 | |||
| 210 | // ─── Values ──────────────────────────────────────────────── | ||
| 211 | |||
| 212 | namespace { | ||
| 213 | // The number in `count` ASCII digits at `from`, or -1. | ||
| 214 | 40341 | int asciiNumber(QStringView text, qsizetype from, qsizetype count) { | |
| 215 | 40341 | int number = 0; | |
| 216 |
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134948 | for (qsizetype index = from; index < from + count; ++index) { |
| 217 | 94613 | const char16_t code = text.at(index).unicode(); | |
| 218 |
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94613 | if (code < u'0' || code > u'9') |
| 219 | 6 | return -1; | |
| 220 | 94607 | number = number * 10 + int(code - u'0'); | |
| 221 | } | ||
| 222 | 40335 | return number; | |
| 223 | } | ||
| 224 | } // namespace | ||
| 225 | |||
| 226 | 6972 | bool parseBasicDate(QStringView text, QDate *date) { | |
| 227 |
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6972 | if (text.size() != 8) |
| 228 | ✗ | return false; | |
| 229 | 6972 | const int year = asciiNumber(text, 0, 4), month = asciiNumber(text, 4, 2), day = asciiNumber(text, 6, 2); | |
| 230 |
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6972 | if (year < 0 || month < 0 || day < 0 || !QDate::isValid(year, month, day)) |
| 231 | 21 | return false; | |
| 232 |
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6951 | *date = QDate(year, month, day); |
| 233 | 6951 | return true; | |
| 234 | } | ||
| 235 | |||
| 236 | 6489 | bool parseBasicDateTime(QStringView text, QDate *date, QTime *time) { | |
| 237 |
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6489 | if (text.size() != 15 || text.at(8) != u'T' || !parseBasicDate(text.left(8), date)) |
| 238 | 14 | return false; | |
| 239 | 6475 | const int hour = asciiNumber(text, 9, 2), minute = asciiNumber(text, 11, 2), second = asciiNumber(text, 13, 2); | |
| 240 |
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6475 | if (hour < 0 || minute < 0 || second < 0 || !QTime::isValid(hour, minute, second)) |
| 241 | 4 | return false; | |
| 242 |
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6471 | *time = QTime(hour, minute, second); |
| 243 | 6471 | return true; | |
| 244 | } | ||
| 245 | |||
| 246 | 72129 | QDateTime fromWallClock(const QDate &date, const QTime &time, const QTimeZone &zone) { | |
| 247 |
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72129 | if (!date.isValid()) |
| 248 | ✗ | return {}; | |
| 249 |
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72129 | if (!zone.isValid()) |
| 250 | 31027 | return QDateTime(date, time); | |
| 251 | 41102 | return QDateTime(date, time, zone, QDateTime::TransitionResolution::RelativeToBefore); | |
| 252 | } | ||
| 253 | |||
| 254 | 6678 | Value parseValue(const QString &text, const QString &tzid, bool forceDate, | |
| 255 | const ZoneResolver &resolver) { | ||
| 256 | 6678 | Value value; | |
| 257 |
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6678 | const QString raw = text.trimmed(); |
| 258 |
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6678 | if (raw.size() == 8 || forceDate) { |
| 259 | // The value type is DATE even when the date itself is invalid. | ||
| 260 | 448 | value.dateOnly = true; | |
| 261 | 448 | QDate date; | |
| 262 |
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448 | if (parseBasicDate(QStringView(raw).left(8), &date)) |
| 263 |
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447 | value.dateTime = QDateTime(date, QTime(0, 0), QTimeZone::utc()); |
| 264 | 448 | return value; | |
| 265 | } | ||
| 266 |
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6230 | const bool utc = raw.endsWith(QLatin1Char('Z')) || raw.endsWith(QLatin1Char('z')); |
| 267 |
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6230 | const QString digits = utc ? raw.left(raw.size() - 1) : raw; |
| 268 | 6230 | QDate date; | |
| 269 | 6230 | QTime time; | |
| 270 | // S106-136: the whole value is the DATE-TIME — trailing characters after | ||
| 271 | // the 15 of "yyyyMMddTHHmmss" make it invalid, not ignored. | ||
| 272 |
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6230 | if (!parseBasicDateTime(QStringView(digits), &date, &time)) |
| 273 | 2 | return value; | |
| 274 |
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6228 | if (utc) { |
| 275 |
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3645 | value.dateTime = QDateTime(date, time, QTimeZone::utc()); |
| 276 | 3645 | return value; | |
| 277 | } | ||
| 278 |
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2583 | const QTimeZone zone = resolver.resolve(tzid); |
| 279 |
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2583 | value.floating = !zone.isValid(); |
| 280 |
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2583 | value.dateTime = fromWallClock(date, time, zone); |
| 281 | 2583 | return value; | |
| 282 | 6678 | } | |
| 283 | |||
| 284 | 6215 | Value parseProperty(const ICal::Property &property, const ZoneResolver &resolver) { | |
| 285 | const bool forceDate = | ||
| 286 |
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6215 | property.parameter(QStringLiteral("VALUE")).compare(QLatin1String("DATE"), Qt::CaseInsensitive) == 0; |
| 287 |
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18645 | return parseValue(property.value, property.parameter(QStringLiteral("TZID")), forceDate, resolver); |
| 288 | } | ||
| 289 | |||
| 290 | 82 | QList<Value> parseList(const ICal::Property &property, const ZoneResolver &resolver) { | |
| 291 | 82 | QList<Value> values; | |
| 292 | const bool forceDate = | ||
| 293 |
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82 | property.parameter(QStringLiteral("VALUE")).compare(QLatin1String("DATE"), Qt::CaseInsensitive) == 0; |
| 294 |
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82 | const QString tzid = property.parameter(QStringLiteral("TZID")); |
| 295 |
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182 | for (const QString &part : ICal::splitValues(property.value)) { |
| 296 |
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100 | const QString start = part.section(QLatin1Char('/'), 0, 0); // PERIOD -> its start |
| 297 |
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100 | const Value value = parseValue(start, tzid, forceDate, resolver); |
| 298 |
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100 | if (value.valid()) |
| 299 |
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100 | values.append(value); |
| 300 | 182 | } | |
| 301 | 82 | return values; | |
| 302 | 82 | } | |
| 303 | |||
| 304 | 130089 | QString zoneId(const QDateTime &dateTime, bool dateOnly) { | |
| 305 |
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130089 | if (dateOnly || !dateTime.isValid()) |
| 306 | 123928 | return {}; | |
| 307 |
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6161 | switch (dateTime.timeSpec()) { |
| 308 | 15 | case Qt::UTC: return {}; | |
| 309 | 1186 | case Qt::LocalTime: return kFloating; | |
| 310 | 4955 | case Qt::TimeZone: { | |
| 311 |
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4955 | const QByteArray id = dateTime.timeZone().id(); |
| 312 |
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4955 | return id == "UTC" ? QString() : QString::fromUtf8(id); |
| 313 | 4955 | } | |
| 314 | 5 | case Qt::OffsetFromUTC: | |
| 315 |
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5 | return QString::fromUtf8(QTimeZone(dateTime.offsetFromUtc()).id()); |
| 316 | } | ||
| 317 | ✗ | return {}; | |
| 318 | } | ||
| 319 | |||
| 320 | 6490 | QTimeZone zoneForId(const QString &id) { | |
| 321 |
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6490 | if (id.isEmpty() || id == kFloating) |
| 322 | ✗ | return {}; | |
| 323 |
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6490 | return QTimeZone(id.toUtf8()); |
| 324 | } | ||
| 325 | |||
| 326 | 1790025 | QDateTime fromStored(qint64 secondsSinceEpoch, const QString &id) { | |
| 327 |
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1790025 | if (id.isEmpty()) |
| 328 |
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1775591 | return QDateTime::fromSecsSinceEpoch(secondsSinceEpoch, QTimeZone::utc()); |
| 329 |
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14434 | if (id == kFloating) |
| 330 |
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7944 | return QDateTime::fromSecsSinceEpoch(secondsSinceEpoch).toLocalTime(); |
| 331 |
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6490 | const QTimeZone zone = zoneForId(id); |
| 332 |
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6490 | if (!zone.isValid()) { |
| 333 |
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2 | qCWarning(lcCalendarTz) << "Stored zone id is unknown on this system:" << id; |
| 334 |
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1 | return QDateTime::fromSecsSinceEpoch(secondsSinceEpoch, QTimeZone::utc()); |
| 335 | } | ||
| 336 |
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6489 | return QDateTime::fromSecsSinceEpoch(secondsSinceEpoch, zone); |
| 337 | 6490 | } | |
| 338 | |||
| 339 | 1144 | QString formatValue(const QDateTime &dateTime, bool dateOnly) { | |
| 340 |
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1144 | if (dateOnly) |
| 341 |
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60 | return dateTime.date().toString(QStringLiteral("yyyyMMdd")); |
| 342 |
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1668 | if (dateTime.timeSpec() == Qt::UTC || |
| 343 |
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1668 | (dateTime.timeSpec() == Qt::TimeZone && dateTime.timeZone().id() == "UTC")) |
| 344 |
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1238 | return dateTime.toUTC().toString(QStringLiteral("yyyyMMdd'T'HHmmss'Z'")); |
| 345 |
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495 | return dateTime.toString(QStringLiteral("yyyyMMdd'T'HHmmss")); |
| 346 | } | ||
| 347 | |||
| 348 | 746 | void writeProperty(ICal::Property *property, const QDateTime &dateTime, bool dateOnly, | |
| 349 | const QString &tzid) { | ||
| 350 |
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1492 | property->removeParameter(QStringLiteral("VALUE")); |
| 351 |
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1492 | property->removeParameter(QStringLiteral("TZID")); |
| 352 |
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746 | if (dateOnly) { |
| 353 |
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87 | property->setParameter(QStringLiteral("VALUE"), QStringLiteral("DATE")); |
| 354 |
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717 | } else if (dateTime.timeSpec() == Qt::TimeZone && dateTime.timeZone().id() != "UTC") { |
| 355 |
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472 | property->setParameter(QStringLiteral("TZID"), |
| 356 |
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944 | tzid.isEmpty() ? QString::fromUtf8(dateTime.timeZone().id()) : tzid); |
| 357 |
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245 | } else if (dateTime.timeSpec() == Qt::OffsetFromUTC) { |
| 358 | // No zone to name: an offset-only value is written as UTC. | ||
| 359 |
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1 | property->setValue(formatValue(dateTime.toUTC(), false)); |
| 360 | 1 | return; | |
| 361 | } | ||
| 362 |
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745 | property->setValue(formatValue(dateTime, dateOnly)); |
| 363 | } | ||
| 364 | |||
| 365 | // ─── VTIMEZONE generation ───────────────────────────────── | ||
| 366 | |||
| 367 | namespace { | ||
| 368 | |||
| 369 | 778 | QString formatOffset(int seconds) { | |
| 370 |
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778 | const QChar sign = seconds < 0 ? QLatin1Char('-') : QLatin1Char('+'); |
| 371 | 778 | const int absolute = qAbs(seconds); | |
| 372 |
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1556 | QString text = sign + QStringLiteral("%1%2").arg(absolute / 3600, 2, 10, QLatin1Char('0')) |
| 373 |
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778 | .arg((absolute % 3600) / 60, 2, 10, QLatin1Char('0')); |
| 374 |
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778 | if (absolute % 60) |
| 375 | ✗ | text += QStringLiteral("%1").arg(absolute % 60, 2, 10, QLatin1Char('0')); | |
| 376 | 778 | return text; | |
| 377 | ✗ | } | |
| 378 | |||
| 379 | 2334 | ICal::Property makeProperty(const QString &name, const QString &value) { | |
| 380 | 2334 | ICal::Property property; | |
| 381 | 2334 | property.name = name; | |
| 382 | 2334 | property.value = value; | |
| 383 | 2334 | return property; | |
| 384 | } | ||
| 385 | |||
| 386 | // "-1SU" style BYDAY for the transition date. | ||
| 387 | 3420 | QString ordinalWeekday(const QDate &date) { | |
| 388 |
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3420 | const int ordinal = date.day() + 7 > date.daysInMonth() ? -1 : (date.day() - 1) / 7 + 1; |
| 389 |
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3420 | return QString::number(ordinal) + RecurrenceRule::weekdayToken(date.dayOfWeek()); |
| 390 | } | ||
| 391 | |||
| 392 | } // namespace | ||
| 393 | |||
| 394 | 199 | ICal::Component vtimezoneFor(const QTimeZone &zone, int year) { | |
| 395 | 199 | ICal::Component timezone; | |
| 396 | 199 | timezone.name = QStringLiteral("VTIMEZONE"); | |
| 397 |
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199 | const QString id = QString::fromUtf8(zone.id()); |
| 398 |
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199 | timezone.appendProperty(makeProperty(QStringLiteral("TZID"), id)); |
| 399 |
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199 | timezone.appendProperty(makeProperty(QStringLiteral("X-LIC-LOCATION"), id)); |
| 400 |
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199 | const QDateTime yearStart(QDate(year, 1, 1), QTime(0, 0), QTimeZone::utc()); |
| 401 |
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199 | const auto transitions = zone.transitions(yearStart.addYears(-1), yearStart.addYears(6)); |
| 402 |
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199 | if (transitions.isEmpty()) { |
| 403 |
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9 | const int offset = zone.offsetFromUtc(yearStart); |
| 404 | 9 | ICal::Component standard; | |
| 405 | 9 | standard.name = QStringLiteral("STANDARD"); | |
| 406 |
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18 | standard.appendProperty(makeProperty(QStringLiteral("TZOFFSETFROM"), formatOffset(offset))); |
| 407 |
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18 | standard.appendProperty(makeProperty(QStringLiteral("TZOFFSETTO"), formatOffset(offset))); |
| 408 |
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18 | standard.appendProperty(makeProperty(QStringLiteral("TZNAME"), zone.abbreviation(yearStart))); |
| 409 |
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18 | standard.appendProperty(makeProperty(QStringLiteral("DTSTART"), QStringLiteral("19700101T000000"))); |
| 410 |
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9 | timezone.components.append(standard); |
| 411 | 9 | return timezone; | |
| 412 | 9 | } | |
| 413 | // Is the pattern yearly-regular? Compare BYMONTH/BYDAY/time per kind. | ||
| 414 | 190 | QHash<bool, QSet<QString>> patterns; | |
| 415 |
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2850 | for (int i = 0; i < transitions.size(); ++i) { |
| 416 |
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2660 | const int before = i > 0 ? transitions.at(i - 1).offsetFromUtc |
| 417 |
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2660 | : zone.offsetFromUtc(transitions.at(i).atUtc.addSecs(-1)); |
| 418 |
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2660 | const QDateTime local = transitions.at(i).atUtc.addSecs(before).toUTC(); |
| 419 |
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5320 | patterns[transitions.at(i).daylightTimeOffset != 0].insert( |
| 420 |
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5320 | QString::number(local.date().month()) + ordinalWeekday(local.date()) + |
| 421 |
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10640 | local.time().toString(QStringLiteral("HHmmss"))); |
| 422 | 2660 | } | |
| 423 |
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190 | const bool regular = patterns.value(true).size() <= 1 && patterns.value(false).size() <= 1; |
| 424 | 190 | QSet<bool> written; | |
| 425 |
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2850 | for (int i = 0; i < transitions.size(); ++i) { |
| 426 | 2660 | const auto &transition = transitions.at(i); | |
| 427 | 2660 | const bool daylight = transition.daylightTimeOffset != 0; | |
| 428 |
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2660 | if (regular && written.contains(daylight)) |
| 429 | 2280 | continue; | |
| 430 |
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380 | const int before = i > 0 ? transitions.at(i - 1).offsetFromUtc |
| 431 |
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380 | : zone.offsetFromUtc(transition.atUtc.addSecs(-1)); |
| 432 |
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380 | const QDateTime local = transition.atUtc.addSecs(before).toUTC(); |
| 433 | 380 | ICal::Component observance; | |
| 434 |
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760 | observance.name = daylight ? QStringLiteral("DAYLIGHT") : QStringLiteral("STANDARD"); |
| 435 |
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760 | observance.appendProperty(makeProperty(QStringLiteral("TZOFFSETFROM"), formatOffset(before))); |
| 436 |
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760 | observance.appendProperty(makeProperty(QStringLiteral("TZOFFSETTO"), formatOffset(transition.offsetFromUtc))); |
| 437 |
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380 | if (!transition.abbreviation.isEmpty()) |
| 438 |
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760 | observance.appendProperty(makeProperty(QStringLiteral("TZNAME"), transition.abbreviation)); |
| 439 | // A regular pattern starts in 1970 (common practice) so consumers can | ||
| 440 | // resolve any year after it; irregular transitions keep their own date. | ||
| 441 | 380 | QDateTime observanceStart = local; | |
| 442 |
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380 | if (regular) { |
| 443 |
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380 | const QString byDay = ordinalWeekday(local.date()); |
| 444 |
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380 | const int ordinal = byDay.chopped(2).toInt(); |
| 445 |
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380 | const int weekday = RecurrenceRule::weekdayFromToken(byDay.right(2)); |
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380 | const QDate first(1970, local.date().month(), 1); |
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380 | const QDate last(1970, first.month(), first.daysInMonth()); |
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380 | QDate day = ordinal > 0 ? first.addDays((weekday - first.dayOfWeek() + 7) % 7 + (ordinal - 1) * 7) |
| 449 |
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376 | : last.addDays(-((last.dayOfWeek() - weekday + 7) % 7)); |
| 450 |
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380 | observanceStart = QDateTime(day, local.time(), QTimeZone::utc()); |
| 451 | 380 | } | |
| 452 |
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380 | observance.appendProperty(makeProperty(QStringLiteral("DTSTART"), |
| 453 |
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760 | observanceStart.toString(QStringLiteral("yyyyMMdd'T'HHmmss")))); |
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380 | if (regular) |
| 455 |
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380 | observance.appendProperty(makeProperty( |
| 456 | 1520 | QStringLiteral("RRULE"), QStringLiteral("FREQ=YEARLY;BYMONTH=%1;BYDAY=%2") | |
| 457 |
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760 | .arg(local.date().month()) |
| 458 |
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1140 | .arg(ordinalWeekday(local.date())))); |
| 459 |
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380 | timezone.components.append(observance); |
| 460 |
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380 | written.insert(daylight); |
| 461 | 380 | } | |
| 462 | 190 | return timezone; | |
| 463 | 199 | } | |
| 464 | |||
| 465 | } // namespace ICalTime | ||
| 466 |