Before this patch, "contrib/check-code.py" can't detect "% inside _()"
correctly, when there are leading whitespaces before the format
string, like below:
_(
"format string %s" % v)
This patch adds regexp pattern "[ \t\n]*" before the pattern matching
against the format string.
"[\s\n]" can't be used in this purpose, because "\s" is automatically
replaced with "[ \t]" by "_preparepats()" and "\s" in "[]" causes
nested "[]" unexpectedly.
The code adding the prefix is now run once per pattern. It was run once per
file (after the change 17484f4c54fb).
Demonstrate that it is working now by extending the test. Raise two different
warnings, one of them twice.
Because string entries are replaced before matching, we must search for
the transformed pattern. But it seems to be quite unique and does not return
false matches. If it will, they can be listed as 3rd arg in pypats.
Some warnings had "warning: " at the beginning of their message. Now this
is done consistent for all messages.
Especially in test-check-code-hg.t it is an advantage to see warnings at once
because only exceptions to them are tolerated. It is (almost) as obvious as
before a6180647ea.
The prefix will not remain when a warning is changed to a failure. A change
like a91387a37f will not be necessary anymore.
- old-style classes were only checked for one-letter class names
- add check for new-style classes with empty parent class, because
this is not available in Python 2.4
The Python 'is' operator compares object identity, so it should
definitely not be applied to string or number literals, which Python
implementations are free to represent with a temporary object.
This should catch the following kinds of bogus expressions (examples):
x is 'foo' x is not 'foo'
x is "bar" x is not "bar"
x is 42 x is not 42
x is -36 x is not -36
As originally proposed by Martin Geisler, amended with catching
negative numbers.
