Andrew Gallant 98a7337d62 syntax/unicode: lightly refactor Perl Unicode class handling
This nominally moves the logic for acquiring Unicode-aware Perl character
classes into the `unicode` module, and also makes the calling code
robust with respect to failures.

This commit is prep work for making the availability of Unicode-aware
Perl classes optional.
2019-09-03 12:35:17 -04:00
..
2019-08-03 16:10:47 -04:00