pgen2 use questions.

Brian L. Troutwine goofyheadedpunk at gmail.com
Tue Jan 9 23:47:20 EST 2007

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I happened to stumble upon Guido's announcement of his python2 to
python3 refactoring tool earlier today
(http://mail.python.org/pipermail/python-3000/2006-December/005102.html),
and, after playing with it a bit, I have some use questions as I don't
quite understand how the pattern matching language works.

In some instances I cannot grok matching certain sorts of patterns,
sometimes very simple ones. For instance, how is the following
incorrect for matching pass statements?

    pass_stmt< 'pass'>

If I wanted to insert "# Do nothing, and well." after each pass
statement how would the transformation work?

Why would this pattern not match function statements?

    funcdef<
               decorators < decs=any >
               'def'
               atom < def_name=NAME >
               parameters < pars=any >
               ':'
               suite < suite_content=any >
               >

If I wanted to change the function name how would I do so? How about
parts of the function body?

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