- StringSegment, ICU4C:
* Moved to top icu namespace
* Compilation unit renamed to string_segment.
- NumberStringBuilder, C and J:
* Moved to main icu namespace
* Compilation unit renamed to formatted_string_builder
* Renamed class to FormattedStringBuilder
- Moves nextPosition logic of NumberStringBuilder to helper class
- remove the old LocaleMatcher implementation code
- move the XLocaleMatcher code into LocaleMatcher, same for test
- remove unused internal methods
- stop comparing old vs. new performance
- generate langInfo.txt resource bundle file with precomputed likely-subtags and matcher data
- make genrb handle multi-line binary values
- load likely-subtags & distance data from new langInfo.res bundle
- test that built data == loaded data
- move data builders to tools, no more runtime dependency on builder code
Get XLocaleMatcher ready for replacing the LocaleMatcher code.
More simplifications beyond ICU-20330 PR #409, smaller data, some more optimizations.
New API ready to be moved over.
- less work for region partitions distance lookup:
- encode each array of single-character partition strings as one string
- look up each desired partition only once, not for each (desired, supported) pair
- look up the * fallback region distance only for the first mismatch, not for each non-matching pair
- skip region distance lookup if minRegionDistance>=remainingThreshold
- locale distance table: remove subtables that contain only *-* with default script/region distance
- mark intermediate subtag matches via last-character bit 7, not also with a match value
- likely subtags data: prune trailing *-only levels, and skip *-only script levels; likely subtags perf test
- likely subtags: skip_script=1; LSR.indexForRegion(ill-formed)=0 not negative
- likely subtags small optimization: array lookup for first letter of language subtag
- defaultDemotionPerDesiredLocale=distance(en, en-GB)
- favor=script: still reject a script mismatch
- if an explicit default locale is given, prefer that (by LSR), not the first supported locale
- XLocaleMatcher.Builder: copy supported locales into a List not a Set to preserve input indexes; duplicates are harmless
- match by LSR only, not exact locale match; results consistent with no fastpath, simpler, sometimes a little slower
- internal getBestMatch() returns just the suppIndex
- store the best desired locale & index in an LSR iterator
- make an LSR from Locale without ULocale detour
- adjust the XLocaleMatcher API as proposed; remove unused internal methods; clean up LocalePriorityList docs
