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96 lines
2.7 KiB
Python
Executable file
96 lines
2.7 KiB
Python
Executable file
#! /usr/bin/env python3
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# This script generates Lib/re/_casefix.py.
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import collections
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import sys
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import unicodedata
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SCRIPT_NAME = 'Tools/build/generate_re_casefix.py'
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def update_file(file, content):
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try:
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with open(file, encoding='utf-8') as fobj:
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if fobj.read() == content:
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return False
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except (OSError, ValueError):
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pass
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with open(file, 'w', encoding='utf-8') as fobj:
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fobj.write(content)
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return True
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re_casefix_template = f"""\
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# Auto-generated by {SCRIPT_NAME}.
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# Maps the code of lowercased character to codes of different lowercased
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# characters which have the same uppercase.
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_EXTRA_CASES = {{
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%s
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}}
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"""
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def uname(i):
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return unicodedata.name(chr(i), r'U+%04X' % i)
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class hexint(int):
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def __repr__(self):
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return '%#06x' % self
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def alpha(i):
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c = chr(i)
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return c if c.isalpha() else ascii(c)[1:-1]
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def main(outfile='Lib/re/_casefix.py'):
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# Find sets of characters which have the same uppercase.
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equivalent_chars = collections.defaultdict(str)
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for c in map(chr, range(sys.maxunicode + 1)):
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equivalent_chars[c.upper()] += c
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equivalent_chars = [t for t in equivalent_chars.values() if len(t) > 1]
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# List of codes of lowercased characters which have the same uppercase.
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equivalent_lower_codes = [sorted(t)
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for s in equivalent_chars
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for t in [{ord(c.lower()) for c in s}]
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if len(t) > 1]
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bad_codes = []
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for t in equivalent_lower_codes:
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for i in t:
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if i > 0xffff:
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bad_codes.extend(t)
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try:
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bad_codes.append(ord(chr(i).upper()))
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except (ValueError, TypeError):
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pass
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break
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if bad_codes:
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print('Case-insensitive matching may not work correctly for character:',
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file=sys.stderr)
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for i in sorted(bad_codes):
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print(" '%s' (U+%04x, %s)" % (alpha(i), i, uname(i)),
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file=sys.stderr)
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sys.exit(1)
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mapping = {i: tuple(j for j in t if i != j)
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for t in equivalent_lower_codes
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for i in t}
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items = []
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for i, t in sorted(mapping.items()):
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items.append(' # %s: %s' % (
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uname(i),
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', '.join(map(uname, t)),
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))
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items.append(" %r: %r, # '%s': '%s'" % (
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hexint(i),
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tuple(map(hexint, t)),
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alpha(i),
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''.join(map(alpha, t)),
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))
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update_file(outfile, re_casefix_template % '\n'.join(items))
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if __name__ == '__main__':
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import sys
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main(*sys.argv[1:])
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