1. Rewrite to use LocalPointer to prevent memory leak
2. Rewrite the if/else to switch to make the logic clear
3. Delete the rule if not remember inside the rule set to fix memory
leak.
4. Check base value calculation to avoid int64_t overflow.
5. Add memory leak test
This also updates the spec tests from the current version of the MFWG
repository and removes some duplicate tests.
Spec tests now reflect the message-format-wg repo as of
5612f3b050
It also updates both the ICU4C and ICU4J parsers to follow the
current test schema in the conformance repository.
This includes adding code to both parsers to allow `src` to be
either a single string or an array of strings (per
https://github.com/unicode-org/conformance/pull/255 ),
and eliminating `srcs` in tests.
It also includes other changes to make updated spec tests pass:
ICU4C: Allow trailing whitespace for complex messages, due to spec change
ICU4C: Parse number literals correctly in Number::format
ICU4J: Allow trailing whitespace after complex body, per spec change
ICU4C: Fix bug that was assuming an .input variable can't have a reserved annotation
ICU4C: Fix bug where unsupported '.i' was parsed as an '.input'
ICU4C/ICU4J: Handle markup with space after the initial left curly brace
ICU4C: Check for duplicate variant errors
ICU4C/ICU4J: Handle leading whitespace in complex messages
ICU4J: Treat whitespace after .input keyword as optional
ICU4J: Don't format unannotated number literals as numbers
Having commented-out checks for things that don't even need to be
checked serves no purpose.
MSVC floating point optimizations don't need to be set, /fp:precise is
the default and has been so for a very long time now:
https://learn.microsoft.com/en-us/cpp/build/reference/fp-specify-floating-point-behavior?view=msvc-140
ICU4C requires C++17 and there aren't any compilers capable of that
without namespace support so there's no need to check that.
Both std::u16string_view and std::wstring_view are possible matches for
UnicodeString as a template parameter, but adding an explicit overload
avoids both having to make that choice and taking the detour through
creating any string view at all.
