Re: internal error

On Sat, Dec 17, 2005 at 04:24:03PM +0100, Bram Moolenaar wrote:

Hi Bram,

> > ,------------------------------------------------------
> > | index_title =  whateverhere
> > |
> > | :rule %.php : %.part
> > |         tmpstring = _no.$(match)_title
> > |         @title = eval( tmpstring )
> > |
> > | files =
> > |     ./ddd/test.php
> > |     ./index.php
> > |
> > | all : $files
> > `---
> > 
> > It seems aap lets python evaluate a variable that does not
> > exist:   _no.test_title
> 
> Well, this happens in the eval() call, which is a Python function.  Thus
> you get a Python error message.
> 
> We could make an exception for errors in Scope.py, since this is
> probably a variable that doesn't exist.  Try this patch:

Yeah, that patch catches it.

There seems to be a bad(probably good anyway?) thing about it:

        tmpstring = _no.$(match)_title
        @try:
        @   title = eval(_no.tmpstring)
        @except:
        @   title = ""
        :print $title

that does not work anymore, because the error gets catched.

I think there is another way, to check if a variable exists:

       @if not hasattr(globals(), 'tmpstring'):
       @   print "variable is not defined"

That would work with checking for globals, but I think I would
need to check for the _no namespace? On #python they told me
something about dir(obj) but I can't get it to work.

How could I check if a variable is 'defined' without the @try:
@except: since that don't seems to work anymore with your patch?


Thanks a lot

marco

PS: I have that all, because I wanted to store 'some' variables
of some title of some pages at the top of the aap recipe, and
later 'trying' to get that value and replacing @TITLE@ with it,
if it exists. If it exists... that's the prob :)

PSII: I'm not even qualified to think about that, if it's ok to
catch all 'internal errors'.  But anyway (my thoughts): normally
'internal error' just sound 'bad', but it also seems to disable
that specific try constuct. But who (unless me) would need a
try/execpt construct? And when it's a user-failure to write
wrong python code with not defined variables, it's maybe ok to
get a normal python error output as you said it is. Called
internal or not.  It's not aap's fault so.

-- 
  calmar

          (o_  It rocks: LINUX + Command-Line-Interface
          //\
          V_/_                     http://www.calmar.ws


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