Because `TimeHour TimeZoneNumericUTCOffsetNotAmbiguous[opt]
TimeZoneBracketedAnnotation[opt]` can be a subset of
`TimeHourNotValidMonth TimeZone` we would not exhaust the whole input
in some cases, which would result in an incorrectly thrown exception.
Not much of a difference as TimeFraction just parses Fraction, but let's
do it correctly. Small mistake I did in 4b7f716.
Thanks to YouTube user gla3dr for noticing this :^)
This is the start of a parser for the ISO 8601 grammar used in the
Temporal spec:
https://tc39.es/proposal-temporal/#sec-temporal-iso8601grammar
We will, on purpose, not use a generic ISO 8601 parser from AK or
similar for two reasons:
- Many AOs make specific assumptions about which productions exist and
access them directly, even when they're part of a larger production.
- The spec says "The grammar deviates from the standard given in ISO
8601 in the following ways:" and then lists 17 of such deviations.
Making that work with a general purpose parser is not worth it.
The public API is not being used anywhere yet, but will be in the next
couple of commits. Likewise, the Production enum will be populated with
all the productions accessed directly (e.g. TemporalDateString).
Many thanks to Ali for showing me how to improve my initial approach
full of macros with a nice RAII helper - it's much nicer :^)
Co-Authored-By: Ali Mohammad Pur <mpfard@serenityos.org>
This is an AK::GenericLexer that exposes helper methods for parsing
date and time related literals (years, months, days, hours, minutes,
seconds, fractional seconds & more)
Here we got our first Temporal object :^)
This patch adds the TimeZone object itself, its constructor and
prototype (currently empty), and a bunch of required abstract operations
