In the C++ break iterator code, change all use of NULL to nullptr.
This is in preparation for follow-on PRs to improve out-of-memory error handling
in Break Iterators, keeping use of nullptr consistent between old and new
or updated code.
Change the mapping from rule number to boundary position to use a simple array
instead of a linear search lookup map.
Look-ahead rules have a preceding context, a boundary position, and following context.
In the implementation, when the preceding context matches, the potential boundary
position is saved. Then, if the following context proves to match, the saved boundary is
returned as an actual boundary.
Look-ahead rules are numbered, and the implementation maintains a map from
rule number to the tentative saved boundary position.
In an earlier improvement to the rule builder, the rule numbering was changed to be a
contiguous sequence, from the original sparse numbering. In anticipation of
changing the mapping from number to position to use a simple array.
- Merge the look-ahead results slots used when multiple rules share a common accepting state.
- Sequentially number the look-ahead result slot. Will eventually allow replacing the runtime map with an array.
- Inhibit chaining out of look-ahead rules. This could never actually happen; when a hard break
rule matches, the engine is stopped immediately, but the state table was being constructed
as if it could happen. Reduces table size for line break rules.
- Remove incorrect handling of fAccepting and fLookAhead fields of a state table row
when removing duplicate states. Look-ahead slot number was being mis-interpreted as a state number.
* ICU-20119 Update and fixes for the following BRS tasks:
- Update urename.h
- Test uconfig.h variations
* ICU-20119 Updates copyright scanner script exclusions: don't scan ./git/*.
* ICU-20119 Changes in reply to comments for pull requst #165.
Includes all line break tailorings.
Corresponding updates to monkey test rules.
State table builder, fix missed table optimization, uncovered by new rule.
