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Clarify the algorithm for range calculation using an explicit variable.

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Former-commit-id: 6755741e7d
This commit is contained in:
Andrew Lin 2015-07-09 16:47:33 -04:00
parent 8a3638bc59
commit 54eece5e8c
1 changed files with 9 additions and 9 deletions
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18
scripts/gen_regex.py
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@ -14,21 +14,21 @@ def func_to_regex(func):
return a regex character class accepting the characters resulting in True.
Ranges separated only by unassigned characters are merged for efficiency.
"""
# A list of [start, end (accepted), end (accepted or unassigned)] lists
# Where the last range would end if it also included unassigned codepoints.
# If we need to add a codepoint right after this point, we extend the
# range; otherwise we start a new one.
tentative_end = None
ranges = []
for i, cat in enumerate(CATEGORIES):
if func(i):
# If the last range can be extended, do so; else start a new one
if ranges and ranges[-1][2] == i - 1:
if tentative_end == i - 1:
ranges[-1][1] = i
ranges[-1][2] = i
else:
ranges.append([i, i, i])
elif cat == 'Cn':
# If the last range can be extended, do so
if ranges and ranges[-1][2] == i - 1:
ranges[-1][2] = i
ranges.append([i, i])
tentative_end = i
elif cat == 'Cn' and tentative_end == i - 1:
tentative_end = i
return '[%s]' % ''.join(chr(r[0]) + '-' + chr(r[1]) for r in ranges)