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Speed up the duration parser #4204

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May 13, 2024
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Speed up the duration parser #4204

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94 changes: 52 additions & 42 deletions libtenzir/include/tenzir/concept/parseable/tenzir/time.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -37,48 +37,58 @@ struct duration_parser : parser_base<duration_parser<Rep, Period>> {
using namespace parsers;
using namespace parser_literals;
using namespace std::chrono;
// clang-format off
auto unit
= "nanoseconds"_p ->* [] { return cast(nanoseconds(1)); }
| "nanosecond"_p ->* [] { return cast(nanoseconds(1)); }
| "nsecs"_p ->* [] { return cast(nanoseconds(1)); }
| "nsec"_p ->* [] { return cast(nanoseconds(1)); }
| "ns"_p ->* [] { return cast(nanoseconds(1)); }
| "microseconds"_p ->* [] { return cast(microseconds(1)); }
| "microsecond"_p ->* [] { return cast(microseconds(1)); }
| "usecs"_p ->* [] { return cast(microseconds(1)); }
| "usec"_p ->* [] { return cast(microseconds(1)); }
| "us"_p ->* [] { return cast(microseconds(1)); }
| "milliseconds"_p ->* [] { return cast(milliseconds(1)); }
| "millisecond"_p ->* [] { return cast(milliseconds(1)); }
| "msecs"_p ->* [] { return cast(milliseconds(1)); }
| "msec"_p ->* [] { return cast(milliseconds(1)); }
| "ms"_p ->* [] { return cast(milliseconds(1)); }
| "seconds"_p ->* [] { return cast(seconds(1)); }
| "second"_p ->* [] { return cast(seconds(1)); }
| "secs"_p ->* [] { return cast(seconds(1)); }
| "sec"_p ->* [] { return cast(seconds(1)); }
| "s"_p ->* [] { return cast(seconds(1)); }
| "minutes"_p ->* [] { return cast(minutes(1)); }
| "minute"_p ->* [] { return cast(minutes(1)); }
| "mins"_p ->* [] { return cast(minutes(1)); }
| "min"_p ->* [] { return cast(minutes(1)); }
| "m"_p ->* [] { return cast(minutes(1)); }
| "hours"_p ->* [] { return cast(hours(1)); }
| "hour"_p ->* [] { return cast(hours(1)); }
| "hrs"_p ->* [] { return cast(hours(1)); }
| "h"_p ->* [] { return cast(hours(1)); }
| "days"_p ->* [] { return cast(hours(24)); }
| "day"_p ->* [] { return cast(hours(24)); }
| "d"_p ->* [] { return cast(hours(24)); }
| "weeks"_p ->* [] { return cast(hours(24 * 7)); }
| "week"_p ->* [] { return cast(hours(24 * 7)); }
| "w"_p ->* [] { return cast(hours(24 * 7)); }
| "years"_p ->* [] { return cast(hours(24 * 365)); }
| "year"_p ->* [] { return cast(hours(24 * 365)); }
| "y"_p ->* [] { return cast(hours(24 * 365)); }
;
// clang-format on
using unit_map_type = std::unordered_map<std::string_view, attribute>;
static const auto unit_map = unit_map_type{
{"nanoseconds", cast(nanoseconds(1))},
{"nanosecond", cast(nanoseconds(1))},
{"nsecs", cast(nanoseconds(1))},
{"nsec", cast(nanoseconds(1))},
{"ns", cast(nanoseconds(1))},
{"microseconds", cast(microseconds(1))},
{"microsecond", cast(microseconds(1))},
{"usecs", cast(microseconds(1))},
{"usec", cast(microseconds(1))},
{"us", cast(microseconds(1))},
{"milliseconds", cast(milliseconds(1))},
{"millisecond", cast(milliseconds(1))},
{"msecs", cast(milliseconds(1))},
{"msec", cast(milliseconds(1))},
{"ms", cast(milliseconds(1))},
{"seconds", cast(seconds(1))},
{"second", cast(seconds(1))},
{"secs", cast(seconds(1))},
{"sec", cast(seconds(1))},
{"s", cast(seconds(1))},
{"minutes", cast(minutes(1))},
{"minute", cast(minutes(1))},
{"mins", cast(minutes(1))},
{"min", cast(minutes(1))},
{"m", cast(minutes(1))},
{"hours", cast(hours(1))},
{"hour", cast(hours(1))},
{"hrs", cast(hours(1))},
{"h", cast(hours(1))},
{"days", cast(hours(24))},
{"day", cast(hours(24))},
{"d", cast(hours(24))},
{"weeks", cast(hours(24 * 7))},
{"week", cast(hours(24 * 7))},
{"w", cast(hours(24 * 7))},
{"years", cast(hours(24 * 365))},
{"year", cast(hours(24 * 365))},
{"y", cast(hours(24 * 365))},
};
static const auto unit
= (+parsers::alpha)
.then([&](std::string str) -> unit_map_type::const_iterator {
return unit_map.find(str);
})
.with([&](unit_map_type::const_iterator it) -> bool {
return it != unit_map.end();
})
.then([](unit_map_type::const_iterator it) -> attribute {
return it->second;
});
if constexpr (std::is_same_v<Attribute, unused_type>) {
auto p = ignore(parsers::real) >> ignore(*space) >> unit;
return p(f, l, unused);
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