mirror of
https://github.com/rspeer/wordfreq.git
synced 2024-12-27 02:48:51 +00:00
93 lines
2.4 KiB
Python
93 lines
2.4 KiB
Python
import unicodedata
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from ftfy import chardata
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import pathlib
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from pkg_resources import resource_filename
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DATA_PATH = pathlib.Path(resource_filename('wordfreq', 'data'))
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def cache_regex_from_func(filename, func):
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"""
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Generates a regex from a function that accepts a single unicode character,
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and caches it in the data path at filename.
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"""
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with (DATA_PATH / filename).open(mode='w') as file:
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file.write(func_to_regex(func))
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def _emoji_char_class():
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"""
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Build a regex for emoji substitution. We create a regex character set
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(like "[a-cv-z]") matching characters we consider emoji.
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"""
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cache_regex_from_func(
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'emoji.txt',
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lambda c:
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chardata.CHAR_CLASS_STRING[ord(c)] == '3' and
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c >= '\u2600' and c != '\ufffd'
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)
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def _non_punct_class():
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"""
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Builds a regex that matches anything that is not one of the following
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classes:
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- P: punctuation
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- S: symbols
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- Z: separators
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- C: control characters
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This will classify symbols, including emoji, as punctuation; callers that
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want to treat emoji separately should filter them out first.
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"""
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cache_regex_from_func(
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'non_punct.txt',
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lambda c: unicodedata.category(c)[0] not in 'PSZC'
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)
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def _combining_mark_class():
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"""
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Builds a regex that matches anything that is a combining mark
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"""
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cache_regex_from_func(
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'combining_mark.txt',
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lambda c: unicodedata.category(c)[0] == 'M'
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)
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def func_to_regex(accept):
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"""
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Converts a function that accepts a single unicode character into a regex.
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Unassigned unicode characters are treated like their neighbors.
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"""
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ranges = []
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start = None
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has_accepted = False
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for x in range(0x110000):
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c = chr(x)
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if accept(c):
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has_accepted = True
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if start is None:
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start = c
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elif unicodedata.category(c) == 'Cn':
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if start is None:
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start = c
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elif start is not None:
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if has_accepted:
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ranges.append('-'.join([start, chr(x-1)]))
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has_accepted = False
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start = None
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else:
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if has_accepted and start is not None:
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ranges.append('-'.join([start, chr(x-1)]))
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return '[%s]' % ''.join(ranges)
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if __name__ == '__main__':
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_combining_mark_class()
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_non_punct_class()
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_emoji_char_class()
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