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LibTimeZone: Parse and generate time zone coordinate data
This commit is contained in:
Timothy Flynn
Andreas Kling
parent
7b41a09540
commit
ea814a3ce6
Notes:
sideshowbarker
2024-07-17 19:51:33 +09:00
Author: https://github.com/trflynn89
Commit: ea814a3ce6
Pull-request: https://github.com/SerenityOS/serenity/pull/12263
Reviewed-by: https://github.com/davidot ✅
4 changed files with 141 additions and 3 deletions
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@ -13,6 +13,7 @@
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibTimeZone/TimeZone.h>
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namespace {
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@ -63,6 +64,8 @@ struct TimeZoneData {
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HashMap<String, Vector<DaylightSavingsOffset>> dst_offsets;
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Vector<String> dst_offset_names;
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HashMap<String, TimeZone::Location> time_zone_coordinates;
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};
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}
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@ -115,6 +118,29 @@ struct AK::Formatter<DaylightSavingsOffset> : Formatter<FormatString> {
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}
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};
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template<>
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struct AK::Formatter<TimeZone::Coordinate> : Formatter<FormatString> {
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ErrorOr<void> format(FormatBuilder& builder, TimeZone::Coordinate const& coordinate)
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{
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return Formatter<FormatString>::format(builder,
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"{{ {}, {}, {} }}",
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coordinate.degrees,
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coordinate.minutes,
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coordinate.seconds);
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}
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};
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template<>
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struct AK::Formatter<TimeZone::Location> : Formatter<FormatString> {
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ErrorOr<void> format(FormatBuilder& builder, TimeZone::Location const& location)
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{
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return Formatter<FormatString>::format(builder,
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"{{ {}, {} }}",
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location.latitude,
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location.longitude);
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}
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};
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static Optional<DateTime> parse_date_time(Span<StringView const> segments)
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{
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constexpr auto months = Array { "Jan"sv, "Feb"sv, "Mar"sv, "Apr"sv, "May"sv, "Jun"sv, "Jul"sv, "Aug"sv, "Sep"sv, "Oct"sv, "Nov"sv, "Dec"sv };
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@ -312,6 +338,56 @@ static ErrorOr<void> parse_time_zones(StringView time_zone_path, TimeZoneData& t
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return {};
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}
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static void parse_time_zone_coordinates(Core::File& file, TimeZoneData& time_zone_data)
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{
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auto parse_coordinate = [](auto coordinate) {
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VERIFY(coordinate.substring_view(0, 1).is_one_of("+"sv, "-"sv));
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TimeZone::Coordinate parsed {};
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if (coordinate.length() == 5) {
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// ±DDMM
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parsed.degrees = coordinate.substring_view(0, 3).to_int().value();
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parsed.minutes = coordinate.substring_view(3).to_int().value();
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} else if (coordinate.length() == 6) {
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// ±DDDMM
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parsed.degrees = coordinate.substring_view(0, 4).to_int().value();
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parsed.minutes = coordinate.substring_view(4).to_int().value();
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} else if (coordinate.length() == 7) {
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// ±DDMMSS
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parsed.degrees = coordinate.substring_view(0, 3).to_int().value();
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parsed.minutes = coordinate.substring_view(3, 2).to_int().value();
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parsed.seconds = coordinate.substring_view(5).to_int().value();
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} else if (coordinate.length() == 8) {
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// ±DDDDMMSS
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parsed.degrees = coordinate.substring_view(0, 4).to_int().value();
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parsed.minutes = coordinate.substring_view(4, 2).to_int().value();
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parsed.seconds = coordinate.substring_view(6).to_int().value();
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} else {
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VERIFY_NOT_REACHED();
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}
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return parsed;
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};
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while (file.can_read_line()) {
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auto line = file.read_line();
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if (line.is_empty() || line.trim_whitespace(TrimMode::Left).starts_with('#'))
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continue;
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auto segments = line.split_view('\t');
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auto coordinates = segments[1];
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auto zone = segments[2];
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VERIFY(time_zone_data.time_zones.contains(zone));
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auto index = coordinates.find_any_of("+-"sv, StringView::SearchDirection::Backward).value();
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auto latitude = parse_coordinate(coordinates.substring_view(0, index));
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auto longitude = parse_coordinate(coordinates.substring_view(index));
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time_zone_data.time_zone_coordinates.set(zone, { latitude, longitude });
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}
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}
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static void set_dst_rule_indices(TimeZoneData& time_zone_data)
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{
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for (auto& time_zone : time_zone_data.time_zones) {
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@ -473,6 +549,18 @@ static constexpr Array<@type@, @size@> @name@ { {
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append_offsets(name, "DaylightSavingsOffset"sv, dst_offsets);
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});
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generator.set("size", String::number(time_zone_data.time_zone_names.size()));
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generator.append(R"~~~(
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static constexpr Array<Location, @size@> s_time_zone_locations { {
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)~~~");
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for (auto const& time_zone : time_zone_data.time_zone_names) {
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auto location = time_zone_data.time_zone_coordinates.get(time_zone).value_or({});
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generator.append(String::formatted(" {},\n", location));
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}
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generator.append("} };\n");
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auto append_string_conversions = [&](StringView enum_title, StringView enum_snake, auto const& values, Vector<Alias> const& aliases = {}) {
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HashValueMap<String> hashes;
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hashes.ensure_capacity(values.size());
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@ -619,6 +707,19 @@ Optional<Array<NamedOffset, 2>> get_named_time_zone_offsets(TimeZone time_zone,
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return named_offsets;
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}
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Optional<Location> get_time_zone_location(TimeZone time_zone)
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{
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auto is_valid_coordinate = [](auto const& coordinate) {
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return (coordinate.degrees != 0) || (coordinate.minutes != 0) || (coordinate.seconds != 0);
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};
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auto const& location = s_time_zone_locations[to_underlying(time_zone)];
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if (is_valid_coordinate(location.latitude) && is_valid_coordinate(location.longitude))
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return location;
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return {};
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}
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)~~~");
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generate_available_values(generator, "all_time_zones"sv, time_zone_data.time_zone_names);
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@ -635,30 +736,35 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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StringView generated_header_path;
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StringView generated_implementation_path;
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StringView time_zone_coordinates_path;
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Vector<StringView> time_zone_paths;
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Core::ArgsParser args_parser;
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args_parser.add_option(generated_header_path, "Path to the time zone data header file to generate", "generated-header-path", 'h', "generated-header-path");
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args_parser.add_option(generated_implementation_path, "Path to the time zone data implementation file to generate", "generated-implementation-path", 'c', "generated-implementation-path");
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args_parser.add_option(time_zone_coordinates_path, "Path to the time zone data coordinates file", "time-zone-coordinates-path", 'z', "time-zone-coordinates-path");
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args_parser.add_positional_argument(time_zone_paths, "Paths to the time zone database files", "time-zone-paths");
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args_parser.parse(arguments);
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auto open_file = [&](StringView path) -> ErrorOr<NonnullRefPtr<Core::File>> {
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auto open_file = [&](StringView path, Core::OpenMode mode = Core::OpenMode::ReadWrite) -> ErrorOr<NonnullRefPtr<Core::File>> {
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if (path.is_empty()) {
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args_parser.print_usage(stderr, arguments.argv[0]);
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return Error::from_string_literal("Must provide all command line options"sv);
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}
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return Core::File::open(path, Core::OpenMode::ReadWrite);
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return Core::File::open(path, mode);
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};
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auto generated_header_file = TRY(open_file(generated_header_path));
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auto generated_implementation_file = TRY(open_file(generated_implementation_path));
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auto time_zone_coordinates_file = TRY(open_file(time_zone_coordinates_path, Core::OpenMode::ReadOnly));
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TimeZoneData time_zone_data {};
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for (auto time_zone_path : time_zone_paths)
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TRY(parse_time_zones(time_zone_path, time_zone_data));
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parse_time_zone_coordinates(time_zone_coordinates_file, time_zone_data);
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generate_time_zone_data_header(generated_header_file, time_zone_data);
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generate_time_zone_data_implementation(generated_implementation_file, time_zone_data);
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