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#!/usr/bin/env python3
import itertools
import os
import re
import sys
if sys.version_info[0] < 3:
raise RuntimeError('This needs to run on Python 3.')
def get_characters():
"""Find every Unicode character that is valid in a Python `identifier`_ but
is not matched by the regex ``\w`` group.
``\w`` matches some characters that aren't valid in identifiers, but
:meth:`str.isidentifier` will catch that later in lexing.
All start characters are valid continue characters, so we only test for
continue characters.
_identifier: https://docs.python.org/3/reference/lexical_analysis.html#identifiers
"""
for cp in range(sys.maxunicode + 1):
s = chr(cp)
if ('a' + s).isidentifier() and not re.match(r'\w', s):
yield s
def collapse_ranges(data):
"""Given a sorted list of unique characters, generate ranges representing
sequential code points.
Source: https://stackoverflow.com/a/4629241/400617
"""
for a, b in itertools.groupby(
enumerate(data),
lambda x: ord(x[1]) - x[0]
):
b = list(b)
yield b[0][1], b[-1][1]
def build_pattern(ranges):
"""Output the regex pattern for ranges of characters.
One and two character ranges output the individual characters.
"""
out = []
for a, b in ranges:
if a == b: # single char
out.append(a)
elif ord(b) - ord(a) == 1: # two chars, range is redundant
out.append(a)
out.append(b)
else:
out.append(f'{a}-{b}')
return ''.join(out)
def main():
"""Build the regex pattern and write it to the file
:file:`jinja2/_identifier.py`."""
pattern = build_pattern(collapse_ranges(get_characters()))
filename = os.path.abspath(os.path.join(
os.path.dirname(__file__), '..', 'jinja2', '_identifier.py'
))
with open(filename, 'w', encoding='utf8') as f:
f.write('# generated by scripts/generate_identifier_pattern.py\n')
f.write(f'pattern = \'{pattern}\'\n')
if __name__ == '__main__':
main()
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