[Octave-bug-tracker] [bug #45878] warning "Octave:language-extension" should only warn in user code

[Lachlan Andrew]

URL:
  <http://savannah.gnu.org/bugs/?45878>

                 Summary: warning "Octave:language-extension" should only warn
in user code
                 Project: GNU Octave
            Submitted by: lachlan
            Submitted on: Sat 05 Sep 2015 10:14:40 AM GMT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: Lachlan
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.0
        Operating System: GNU/Linux

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Details:

What is the purpose of warning "Octave:language-extension"?
I am trying to write code compatible with Matlab, and though that turning this
warning on would warn me when I use something not compatible with Matlab.

Instead, when I turn this warning on, it fills the screen with warnings about
Octave's libraries using language extensions, but fails to tell me, for
example, when I use  endif  instead of  end.


To make this warning useful, I propose that we:
1. Have a new mode for warnings.  As well as "off", "on" and "error", there
could be "user", which turns the warning on in user code but off in library
code.  There could also be "user-error" to raise errors if the condition
occurs in user code.  I assume that fcn.is_user_code ()  can be used to test
this.
2. Overhaul the places Octave:language-extension is raised, so that it
reliably raises errors for code that is syntactically incompatible with
Matlab.
3. Add a new warning for code syntactically compatible with Matlab, but which
would cause run-time errors.

Any suggestions?




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