Zac Burns <zac256 <at> gmail.com> writes:
>
>
> Greetings,I'm trying to re-purpose the lib2to3 module and along the way came
up with this pattern:"funcdef<'def' name=NAME parameters ['->' test] ':'
suite=suite>"It seems to have 2 problems:
>
> Single-line defs are not matched. Eg: "def singleLineFunc(): return 1 + 2" is
not matched, but "def multiLineFunc():\n a = 1 + 2\n return a" is matched.
The pattern for that is funcdef< 'def' 'singleLineFunc' parameters< '(' ')' >
':' simple_stmt< return_stmt< 'return' arith_expr< '1' '+' '2' > > '\n' > >. No
suite.
> The first multi-line function in a file is matched twice (eg, the same node,
results pair is passed to the transform method.
That is odd and maybe a 2to3 bug. Could you post an example?
>
> Why are these happening? If anyone could point me to a general discussion
about creating these would be most helpful. I haven't found a lot of resources
for these and investigating has been more of a struggle than usual.
Yes, 2to3 pattern matching is poorly documented. scripts/find_pattern.py is your
friend.
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