Re: [Pyparsing] Naming elements based on their predecessor

[Joshua J. K. <jk...@sk...>]

On Thu, 2008-03-06 at 18:23 -0600, Paul McGuire wrote:
> You are the perfect straight-man!

Uh, thanks? :)

> What you describe is exactly what the Dict class is for.  Dict is something
> kind of unwieldy, so there is also a dictOf(key,value) helper method.

Ah...spiffy.

OK, so here's what I came up with:

ext_prop = (p.Combine(p.Keyword('exec') +
                      p.Keyword('sp_addextendedproperty'),
                      joinString=" ", adjacent=False) +
            p.delimitedList(p.Dict(p.Group(p.Keyword('N').suppress() +
                        p.QuotedString(quoteChar="'") +
                        p.Literal(',').suppress() +
                        p.Keyword('N').suppress() +
                        p.QuotedString(quoteChar="'"))))
            )


And it seems to work just fine.  Noticed something interesting: on a
parsing object, an unknown attribute (such as 'asdfasdfsadf') will
return '' (an empty string).  Is this intended behavior?  It makes
testing for attributes via hasattr impossible.  I can always test for an
empty string, of course, but I'd rather use exceptions and catch an
AttributeError than an if/then block to see if the string is non-emtpy.
But that's just me.

Anyway, thanks for the pointers.  You've been a *huge* help.

j

-- 
Joshua Kugler
VOC/SigNet Provider (aka Web App Programmer)
S&K Aerospace Alaska