mirror of
https://github.com/rspeer/wordfreq.git
synced 2024-12-26 02:28:50 +00:00
79 lines
2.5 KiB
Python
79 lines
2.5 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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CATEGORIES = [unicodedata.category(chr(i)) for i in range(0x110000)]
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DATA_PATH = pathlib.Path(resource_filename('wordfreq', 'data'))
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def func_to_regex(accept):
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"""
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Given a function that returns True or False for a numerical codepoint,
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return a regex character class accepting the characters resulting in True.
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Ranges separated only by unassigned characters are merged for efficiency.
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"""
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# start and end of the range we are currently parsing. `start` is None if
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# we are not parsing a range.
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start = end = None
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ranges = []
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for codepoint, category in enumerate(CATEGORIES):
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if accept(codepoint):
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if start is None:
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start = codepoint
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end = codepoint
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elif category != 'Cn' and start is not None:
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ranges.append((start, end))
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start = end = None
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if start is not None:
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ranges.append((start, end))
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return '[%s]' % ''.join('%s-%s' % (chr(r[0]), chr(r[1])) for r in ranges)
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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 _is_emoji_codepoint(i):
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"""
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Report whether a numerical codepoint is (likely) an emoji: a Unicode 'So'
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character (as future-proofed by the ftfy chardata module) but excluding
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symbols like © and ™ below U+2600 and the replacement character U+FFFD.
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"""
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return chardata.CHAR_CLASS_STRING[i] == '3' and i >= 0x2600 and i != 0xfffd
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def _is_non_punct_codepoint(i):
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"""
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Report whether a numerical codepoint is not one of the following 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; users that
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want to accept emoji should add them separately.
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"""
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return CATEGORIES[i][0] not in 'PSZC'
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def _is_combining_mark_codepoint(i):
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"""
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Report whether a numerical codepoint is a combining mark (Unicode 'M').
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"""
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return CATEGORIES[i][0] == 'M'
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if __name__ == '__main__':
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cache_regex_from_func('emoji.txt', _is_emoji_codepoint)
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cache_regex_from_func('non_punct.txt', _is_non_punct_codepoint)
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cache_regex_from_func('combining_mark.txt', _is_combining_mark_codepoint)
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