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LibTimeZone: Parse and generate time zone abbreviation format strings

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For example, today, America/New_York has the format string "E%sT" and
uses US DST rules. Those rules indicate the %s should be replaced by a
"D" in daylight time and "S" in standard time.
This commit is contained in:
Timothy Flynn 2022-01-24 10:25:47 -05:00 • committed by Linus Groh
parent 40147c48be
commit ef0155932b
1 changed files with 45 additions and 6 deletions
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51
Meta/Lagom/Tools/CodeGenerators/LibTimeZone/GenerateTimeZoneData.cpp
View file

@ -16,6 +16,9 @@
namespace {
using StringIndexType = u8;
constexpr auto s_string_index_type = "u8"sv;
struct DateTime {
u16 year { 0 };
Optional<u8> month;
@ -37,6 +40,9 @@ struct TimeZoneOffset {
Optional<String> dst_rule;
Optional<i32> dst_rule_index;
i64 dst_offset { 0 };
StringIndexType standard_format { 0 };
StringIndexType daylight_format { 0 };
};
struct DaylightSavingsOffset {
@ -44,9 +50,13 @@ struct DaylightSavingsOffset {
u16 year_from { 0 };
u16 year_to { 0 };
DateTime in_effect;
StringIndexType format { 0 };
};
struct TimeZoneData {
UniqueStringStorage<StringIndexType> unique_strings;
HashMap<String, Vector<TimeZoneOffset>> time_zones;
Vector<String> time_zone_names;
Vector<Alias> time_zone_aliases;
@ -80,12 +90,14 @@ 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.dst_rule_index.value_or(-1),
time_zone_offset.dst_offset);
time_zone_offset.dst_offset,
time_zone_offset.standard_format,
time_zone_offset.daylight_format);
}
};
@ -94,11 +106,12 @@ struct AK::Formatter<DaylightSavingsOffset> : Formatter<FormatString> {
ErrorOr<void> format(FormatBuilder& builder, DaylightSavingsOffset const& dst_offset)
{
return Formatter<FormatString>::format(builder,
"{{ {}, {}, {}, {} }}",
"{{ {}, {}, {}, {}, {} }}",
dst_offset.offset,
dst_offset.year_from,
dst_offset.year_to,
dst_offset.in_effect);
dst_offset.in_effect,
dst_offset.format);
}
};
@ -172,6 +185,19 @@ static void parse_dst_rule(StringView segment, TimeZoneOffset& time_zone)
time_zone.dst_rule = segment;
}
static void parse_format(StringView format, TimeZoneData& time_zone_data, TimeZoneOffset& time_zone)
{
auto formats = format.replace("%s"sv, "{}"sv).split('/');
VERIFY(formats.size() <= 2);
time_zone.standard_format = time_zone_data.unique_strings.ensure(formats[0]);
if (formats.size() == 2)
time_zone.daylight_format = time_zone_data.unique_strings.ensure(formats[1]);
else
time_zone.daylight_format = time_zone.standard_format;
}
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 == ' '); });
@ -183,6 +209,7 @@ 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);
parse_format(segments[4], time_zone_data, time_zone);
if (segments.size() > 5)
time_zone.until = parse_date_time(segments.span().slice(5));
@ -196,7 +223,7 @@ static Vector<TimeZoneOffset>& parse_zone(StringView zone_line, TimeZoneData& ti
return time_zones;
}
static void parse_zone_continuation(StringView zone_line, Vector<TimeZoneOffset>& time_zones)
static void parse_zone_continuation(StringView zone_line, TimeZoneData& time_zone_data, Vector<TimeZoneOffset>& time_zones)
{
auto segments = zone_line.split_view_if([](char ch) { return (ch == '\t') || (ch == ' '); });
@ -204,6 +231,7 @@ static void parse_zone_continuation(StringView zone_line, Vector<TimeZoneOffset>
TimeZoneOffset time_zone {};
time_zone.offset = parse_time_offset(segments[0]);
parse_dst_rule(segments[1], time_zone);
parse_format(segments[2], time_zone_data, time_zone);
if (segments.size() > 3)
time_zone.until = parse_date_time(segments.span().slice(3));
@ -245,6 +273,9 @@ static void parse_rule(StringView rule_line, TimeZoneData& time_zone_data)
auto in_effect = Array { "0"sv, segments[5], segments[6], segments[7] };
dst_offset.in_effect = parse_date_time(in_effect).release_value();
if (segments[9] != "-"sv)
dst_offset.format = time_zone_data.unique_strings.ensure(segments[9]);
auto& dst_offsets = time_zone_data.dst_offsets.ensure(name);
dst_offsets.append(move(dst_offset));
@ -267,7 +298,7 @@ static ErrorOr<void> parse_time_zones(StringView time_zone_path, TimeZoneData& t
last_parsed_zone = &parse_zone(line, time_zone_data);
} else if (line.starts_with('\t')) {
VERIFY(last_parsed_zone != nullptr);
parse_zone_continuation(line, *last_parsed_zone);
parse_zone_continuation(line, time_zone_data, *last_parsed_zone);
} else {
last_parsed_zone = nullptr;
@ -346,6 +377,7 @@ static void generate_time_zone_data_implementation(Core::File& file, TimeZoneDat
{
StringBuilder builder;
SourceGenerator generator { builder };
generator.set("string_index_type"sv, s_string_index_type);
set_dst_rule_indices(time_zone_data);
@ -389,6 +421,9 @@ struct TimeZoneOffset {
i32 dst_rule { -1 };
i64 dst_offset { 0 };
@string_index_type@ standard_format { 0 };
@string_index_type@ daylight_format { 0 };
};
struct DaylightSavingsOffset {
@ -396,9 +431,13 @@ struct DaylightSavingsOffset {
u16 year_from { 0 };
u16 year_to { 0 };
DateTime in_effect {};
@string_index_type@ format { 0 };
};
)~~~");
time_zone_data.unique_strings.generate(generator);
auto append_offsets = [&](auto const& name, auto type, auto const& offsets) {
generator.set("name", name);
generator.set("type", type);