#11542: Fix preparse_file to prevent constants from being assigned to
------------------------------+---------------------------------------------
Reporter: nbruin | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.2
Component: user interface | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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In this [https://groups.google.com/group/sage-
devel/browse_thread/thread/97757e7b9f0d3f5b?hl=en sage-devel thread] Tom
Boothby observed that misc.preparse_file has a habit to replace integers
by identifiers that are supposed to be constants. This transformation
turns some ungrammatical strings into grammatical ones, such as
{{{
1=5
}}}
which gets preparsed to
{{{
_sage_const_1 = Integer(1)
_sage_const_5 = Integer(5)
_sage_const_1 =_sage_const_5
}}}
Note that there does not have to be a "=" involved for this to happen:
{{{
[1^2 for j in range(10) for 1 in [1..2*1] ]
}}}
which only differs one keyword from the perfectly legal
{{{
[1^2 for j in range(10) if 1 in [1..2*1] ]
}}}
so it's likely that one has to fully parse the string to detect the
problems.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11542>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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