When normalizing, we need to stop processing on an NFC boundary, not an
NFD boundary, to support normalizations such as in Bengali, where
appending `U+09D7` to a context of `U+0995 U+09C7` should result in
`U+0995 U+09CC`.
The specification is unclear on this; see https://unicode-org.atlassian.net/browse/CLDR-19218
This also updates the ldml keyboard unit test suite to support running
in full NFC mode (used in all Engine implementations) as well retaining
the NFD mode (now only used by the debugger).
Side note: the Bengali normalization failure case was picked up by the
improvements to the unit test suite, proving once again that good tests
are so valuable.
Fixes: #15491Fixes: #15505
Follows: #15488
Relates-to: CLDR-19218
- temporary header file generated by wasm during build
- built using icu
- test_unicode verifies the contents and synchronization with running ICU.
- this is used by util_normalize to provide normalization properties under wasm without needing to include ICU.
Fixes: #9467
- add core/tools build tree with custom targets
- add to core/build.sh to generate nfd_table.h
- test_unicode to validate Unicode version and compare NFD to actual ICU
- currently, linear search of the table.
- add a normalize_nfd() which takes a single codepoint
- temporarily keep ICU in actions_normalize.cpp and ldml_transforms.cpp
- expand wasm opts in unit tests
- always set to 0 for now (keep ICU around)
- set KMN_IN_LDML_TESTS in tests to keep ICU there for test and comparison
- add core_icu.cpp and put some utils there.
#9467
