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LibTimeZone: Parse and generate LINK entries from the TZDB as aliases

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For example, "GMT" should be linked to the golden time zone "Etc/GMT".
This commit is contained in:
Timothy Flynn 2022-01-07 08:59:52 -05:00 • committed by Linus Groh
parent 9253e695d1
commit b5758a0623
Notes: sideshowbarker 2024-07-17 21:26:42 +09:00
1 changed files with 21 additions and 3 deletions

24
Meta/Lagom/Tools/CodeGenerators/LibTimeZone/GenerateTimeZoneData.cpp
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@ -36,6 +36,7 @@ struct TimeZone {
struct TimeZoneData {
HashMap<String, Vector<TimeZone>> time_zones;
Vector<String> time_zones_names;
Vector<Alias> time_zones_aliases;
};
static Time parse_time(StringView segment)
@ -126,6 +127,18 @@ static void parse_zone_continuation(StringView zone_line, Vector<TimeZone>& time
time_zones.append(move(time_zone));
}
static void parse_link(StringView link_line, TimeZoneData& time_zone_data)
{
auto segments = link_line.split_view_if([](char ch) { return (ch == '\t') || (ch == ' '); });
// Link TARGET LINK-NAME
VERIFY(segments[0] == "Link"sv);
auto target = segments[1];
auto alias = segments[2];
time_zone_data.time_zones_aliases.append({ target, alias });
}
static ErrorOr<void> parse_time_zones(StringView time_zone_path, TimeZoneData& time_zone_data)
{
// For reference, the man page for `zic` has the best documentation of the TZDB file format.
@ -144,6 +157,9 @@ static ErrorOr<void> parse_time_zones(StringView time_zone_path, TimeZoneData& t
parse_zone_continuation(line, *last_parsed_zone);
} else {
last_parsed_zone = nullptr;
if (line.starts_with("Link"sv))
parse_link(line, time_zone_data);
}
}
@ -186,7 +202,7 @@ static void generate_time_zone_data_header(Core::File& file, TimeZoneData& time_
namespace TimeZone {
)~~~");
generate_enum(generator, format_identifier, "TimeZone"sv, {}, time_zone_data.time_zones_names);
generate_enum(generator, format_identifier, "TimeZone"sv, {}, time_zone_data.time_zones_names, time_zone_data.time_zones_aliases);
generator.append(R"~~~(
}
@ -211,17 +227,19 @@ static void generate_time_zone_data_implementation(Core::File& file, TimeZoneDat
namespace TimeZone {
)~~~");
auto append_from_string = [&](StringView enum_title, StringView enum_snake, auto const& values) {
auto append_from_string = [&](StringView enum_title, StringView enum_snake, auto const& values, auto const& aliases) {
HashValueMap<String> hashes;
hashes.ensure_capacity(values.size());
for (auto const& value : values)
hashes.set(value.hash(), format_identifier(enum_title, value));
for (auto const& alias : aliases)
hashes.set(alias.alias.hash(), format_identifier(enum_title, alias.alias));
generate_value_from_string(generator, "{}_from_string"sv, enum_title, enum_snake, move(hashes));
};
append_from_string("TimeZone"sv, "time_zone"sv, time_zone_data.time_zones_names);
append_from_string("TimeZone"sv, "time_zone"sv, time_zone_data.time_zones_names, time_zone_data.time_zones_aliases);
generator.append(R"~~~(
}