Thread UTF-16 string input through JSON, script parsing, Date parsing,
Intl option parsing, Temporal parsing, and the helper library boundaries
that feed those parsers. Preserve ASCII fast paths where the source data
is known to be ASCII.
DateParser is a GenericLexer, which is not particularly UTF-8 aware.
Other engines do not accept ASCII input, so let's just reject non-ASCII
strings outright.
While we are here, let's avoid the std ctype header. It is explicitly
undefined behavior to provide code points to isspace, isalpha, etc. that
do not fit in an unsigned char. Although this isn't reachable any longer
let's just nip it in the bud and use our safe AK character types.
Just to demonstrate, the following returns different values for me on
different systems and with different compilers:
isdigit(0xff01)
isalpha(0xff01)
isspace(0xff01)
* Replace std::pair with a named struct, which we've always preferred.
* Remove needless use of std::ignore.
* Use concepts from AK instead of type traits from the STL.
This class was effectively upside-down compared to the way we typically
organize our classes.
* Put public section above private section
* Put methods above members
* Add newlines between methods
Accept single-digit minute and second components for space-separated
ISO-like dates. This matches other engines and the SpiderMonkey test.
Keep T-separated date-times stricter by rejecting bare hour offsets like
-07, while still allowing the non-standard space-separated form.
