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bpo-31672: Fix string.Template accidentally matched non-ASCII identifiers (GH-3872)

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Pattern `[a-z]` with `IGNORECASE` flag can match to some non-ASCII characters.

Straightforward solution for this is using `IGNORECASE | ASCII` flag.
But users may subclass `Template` and override only `idpattern`. So we want to
avoid changing `Template.flags`.

So this commit uses local flag `-i` for `idpattern` and change `[a-z]` to `[a-zA-Z]`.
(cherry picked from commit b22273ec5d)
This commit is contained in:
INADA Naoki 2017-10-14 14:21:59 +09:00 • committed by GitHub
parent 6234e90683
commit 7060380d57
4 changed files with 25 additions and 3 deletions
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6
Lib/test/test_string.py
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@ -271,6 +271,12 @@ class TestTemplate(unittest.TestCase):
raises(ValueError, s.substitute, dict(who='tim'))
s = Template('$who likes $100')
raises(ValueError, s.substitute, dict(who='tim'))
# Template.idpattern should match to only ASCII characters.
# https://bugs.python.org/issue31672
s = Template("$who likes $\u0131") # (DOTLESS I)
raises(ValueError, s.substitute, dict(who='tim'))
s = Template("$who likes $\u0130") # (LATIN CAPITAL LETTER I WITH DOT ABOVE)
raises(ValueError, s.substitute, dict(who='tim'))
def test_idpattern_override(self):
class PathPattern(Template):