Terry J. Reedy added the comment:
idlelib has two files that *might* be helpful to anyone who wants to pursue
this: PyParse.py and HyperParser.py. One use of the latter is for calltips.
When the user types '(', the HyperParser is used first to determine whether the
'(' is preceded by an operator (making it a grouper) or not (making it a call
operator). In the later case, it parses backwards to find the beginning of the
callable expression, which is then evaluated to get the callable (if it does
not contain an embedded call) and hence the signature. Parsing forward and back
from a given line might be similar.
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<http://bugs.python.org/issue12458>
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