#11791: Introspection for interactively defined classes with metaclass
---------------------------+------------------------------------------------
Reporter: SimonKing | Owner: jason
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.7.2
Component: misc | Keywords: introspection, cython, dynamic
metaclass
Work_issues: | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #11298, #11768, #11734
---------------------------+------------------------------------------------
#11298 provides the possibility to inspect interactive cython code.
However, the following case did not work:
{{{
sage: cython_code = [
....: 'from sage.structure.dynamic_class import dynamic_class',
....: 'from sage.all import cached_function',
....: 'MyMetaclass = dynamic_class("MyMetaclass",(ClasscallMetaclass,))',
....: 'class Bar2:',
....: ' __metaclass__ = MyMetaclass',
....: ' @cached_function',
....: ' def __classcall__(cls, R):',
....: ' return type.__call__(cls, R)',
....: ' def __init__(self,R):',
....: ' self.R = R',
....: ' def __repr__(self):',
....: ' return "[%s]"%self.R',
....: ' def __hash__(self):',
....: ' print "computing the hash"',
....: ' return int(12345)']
sage: sage: cython('\n'.join(cython_code))
sage: Bar2??
}}}
It would show the code of `ClasscallMetaclass`, not the definition of
`Bar2`.
The attached patch fixes it. It is based on cleaning-up
`sage_getsourcelines`: That function uses different techniques to get the
source lines, and it turns out that they were attempted in a wrong order.
The patch also needs #11768, or it wouldn't apply, and #11734, or sage
would not start.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11791>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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