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Code Issues Projects Releases Packages Wiki Activity Actions 9

LibTimeZone: Parse and generate DST rule links for each ZONE entry

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Each ZONE entry contains a RULES segment with one of the following:

  * A DST rule name, which links the ZONE to a RULE entry holding the
    DST rules to apply.
  * A static offset to be applied to the STDOFF offset. This implicitly
    means that the time zone is in DST during that time frame.
  * A "-" string, meaning no offset is applied to the STDOFF offset, and
    the time zone is in standard time during that time frame.
This commit is contained in:
Timothy Flynn 2022-01-18 12:20:15 -05:00 • committed by Linus Groh
parent 0e58b04b5c
commit 9dd4602636
Notes: sideshowbarker 2024-07-17 20:37:51 +09:00
1 changed files with 36 additions and 2 deletions
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38
Meta/Lagom/Tools/CodeGenerators/LibTimeZone/GenerateTimeZoneData.cpp
View file

@ -33,6 +33,10 @@ struct DateTime {
struct TimeZoneOffset {
i64 offset { 0 };
Optional<DateTime> until;
Optional<String> dst_rule;
Optional<i32> dst_rule_index;
i64 dst_offset { 0 };
};
struct DaylightSavingsOffset {
@ -76,10 +80,12 @@ struct AK::Formatter<TimeZoneOffset> : Formatter<FormatString> {
ErrorOr<void> format(FormatBuilder& builder, TimeZoneOffset const& time_zone_offset)
{
return Formatter<FormatString>::format(builder,
"{{ {}, {}, {} }}",
"{{ {}, {}, {}, {}, {} }}",
time_zone_offset.offset,
time_zone_offset.until.value_or({}),
time_zone_offset.until.has_value());
time_zone_offset.until.has_value(),
time_zone_offset.dst_rule_index.value_or(-1),
time_zone_offset.dst_offset);
}
};
@ -158,6 +164,14 @@ static i64 parse_time_offset(StringView segment)
return (hours * 3600) + sign * ((minutes * 60) + seconds);
}
static void parse_dst_rule(StringView segment, TimeZoneOffset& time_zone)
{
if (segment.contains(':'))
time_zone.dst_offset = parse_time_offset(segment);
else if (segment != "-"sv)
time_zone.dst_rule = segment;
}
static Vector<TimeZoneOffset>& parse_zone(StringView zone_line, TimeZoneData& time_zone_data)
{
auto segments = zone_line.split_view_if([](char ch) { return (ch == '\t') || (ch == ' '); });
@ -168,6 +182,7 @@ static Vector<TimeZoneOffset>& parse_zone(StringView zone_line, TimeZoneData& ti
TimeZoneOffset time_zone {};
time_zone.offset = parse_time_offset(segments[2]);
parse_dst_rule(segments[3], time_zone);
if (segments.size() > 5)
time_zone.until = parse_date_time(segments.span().slice(5));
@ -188,6 +203,7 @@ static void parse_zone_continuation(StringView zone_line, Vector<TimeZoneOffset>
// STDOFF RULES FORMAT [UNTIL]
TimeZoneOffset time_zone {};
time_zone.offset = parse_time_offset(segments[0]);
parse_dst_rule(segments[1], time_zone);
if (segments.size() > 3)
time_zone.until = parse_date_time(segments.span().slice(3));
@ -265,6 +281,19 @@ static ErrorOr<void> parse_time_zones(StringView time_zone_path, TimeZoneData& t
return {};
}
static void set_dst_rule_indices(TimeZoneData& time_zone_data)
{
for (auto& time_zone : time_zone_data.time_zones) {
for (auto& time_zone_offset : time_zone.value) {
if (!time_zone_offset.dst_rule.has_value())
continue;
auto dst_rule_index = time_zone_data.dst_offset_names.find_first_index(*time_zone_offset.dst_rule);
time_zone_offset.dst_rule_index = static_cast<i32>(dst_rule_index.value());
}
}
}
static String format_identifier(StringView owner, String identifier)
{
constexpr auto gmt_time_zones = Array { "Etc/GMT"sv, "GMT"sv };
@ -318,6 +347,8 @@ static void generate_time_zone_data_implementation(Core::File& file, TimeZoneDat
StringBuilder builder;
SourceGenerator generator { builder };
set_dst_rule_indices(time_zone_data);
generator.append(R"~~~(
#include <AK/Array.h>
#include <AK/BinarySearch.h>
@ -355,6 +386,9 @@ struct TimeZoneOffset {
DateTime until {};
bool has_until { false };
i32 dst_rule { -1 };
i64 dst_offset { 0 };
};
struct DaylightSavingsOffset {