the maxima interface doesn't recognize a syntax error

[mwhansen]

sage: maxima.eval('sage0: x == x;')
display2d : false; 
(%o2) false

0; 
(%o4) 0

It hangs there. If doing the same thing in Maxima, we get the following results:

(%i1) sage0: x==x;
Incorrect syntax: = is not a prefix operator
sage0: x==
        ^

Component: interfaces

Author: Mike Hansen

Reviewer: Karl-Dieter Crisman

Merged: sage-4.3.1.rc1

Issue created by migration from https://trac.sagemath.org/ticket/2109

[aghitza]

comment:1

Here is what happens in sage-4.1.1:

sage: maxima.eval('sage0: x == x;')
'x'

[kcrisman]

comment:2

So at least it doesn't hang anymore. I will change the summary.

[mwhansen]

Attachment: trac_2109.patch.gz

[mwhansen]

Author: Mike Hansen

[kcrisman]

Reviewer: Karl-Dieter Crisman

[kcrisman]

comment:4

Passes relevant tests, catches several different types of incorrect input errors, and helped me learn a little more about pexpect. Positive review, and thanks!

Unfortunately, it doesn't catch when someone does something like this, but I'm not sure this is really an "error", as it's intended that Maxima can handle this sort of thing... yet it could easily come as a result of an error by the user. Oh well.

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