#17778: preparse behaviour
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Reporter: mantepse | Owner:
Type: enhancement | Status: new
Priority: minor | Milestone: sage-6.5
Component: user interface | Resolution:
Keywords: preparser | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> I noticed that apparently {{{preparse}}} treats a (multiline) string as
> comment, if the first non-whitespace character is a {{{#}}}:
> {{{
> L = line.lstrip()
> if len(L) > 0 and L[0] in ['#', '!']:
> return line
> }}}
>
> I wonder why, because it is not unusual for a block of code to start with
> a comment. I cannot see where comments in later lines are treated, so I
> have no idea how to fix this.
New description:
I noticed that apparently {{{preparse}}} treats a (multiline) string as
comment, if the first non-whitespace character is a {{{#}}}:
{{{
L = line.lstrip()
if len(L) > 0 and L[0] in ['#', '!']:
return line
}}}
I wonder why, because it is not unusual for a block of code to start with
a comment. I cannot see where comments in later lines are treated, so I
have no idea how to fix this.
The issue is that when calling preparse, if the first line is a comment
(IDK why it would start with a `!`...) then it does not preparse anything
further. Specifically, if there is a multiline statement that you want to
preparse, but the first line is a comment, it doesn't do anything. For
example:
{{{
# Comment
def foo(x):
R.<y> = QQ[]
return x * y
}}}
would not get preparsed. Given the description, the preparser works on the
assumption that the input is a specific self-contained line, but it seems
to have the functionality to handle multi-line input. I think we should
either see if there is a line break and then preparse the rest after the
comment line or very explicitly state the assumption.
--
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Ticket URL: <http://trac.sagemath.org/ticket/17778#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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