Re: Scripting

[Serbinenko Vladimir]

Marco Gerards wrote:

> Hollis Blanchard <address@hidden> writes:
>
>  
>
> > On Feb 13, 2005, at 12:56 PM, Marco Gerards wrote:
> >
> >    
> >
> > > Serbinenko Vladimir <address@hidden> writes:
> > >      
> > >
> > > > > What kind of parser is it?
> > > > >
> > > > >          
> > > > It's a direct parser with aritmetic subparser. Main parser is
> > > > grub_bash_execute, arithmetic subparser is grub_bash_eval_arith.
> > > > grub_bash_execute determinates the special cases (loops,conditions,
> > > > functions,...) for other cases (commands,assignments, function
> > > > calling)
> > > > it calls grub_bash_split_tokens, grub_bash_expand_braces and
> > > > grub_bash_expand_dollar
> > > >
> > > >        
> > > >
> > > > > I have never seen this in a top-down or bottom-up parser I have
> > > > > studied.
> > > > >          
> > > > I don't like to write the things reffering every time to algorithm.
> > > > Genereally I take some ideas and I write myself, at my own.
> > > >        
> > > What do you mean?
> > >
> > > The problem is that I like proven concepts.  And when you use a
> > > commonly known parser design many people will be able to understand
> > > it.  To me this is REALLY important.  I wonder what other developers
> > > think of that.
> > >      
> > I agree. Hand-written parsers are very hairy to implement, with nasty
> > bugs and corner cases. Although I haven't studied the theory, I know
> > that there are traditional parsing/lexing/whatever techniques that are
> > well-understood.
> >    
>
> Right.  But I would not have a problem with a hand written parser, as
> long as I can understand it. :)
>
>  
>
> > In fact, there's a whole bunch of tools like flex and bison that we
> > could use to avoid hand-written errors. Why don't we use those?
> >    
>
> One thing that should be looked into before using flex and bison is
> how much the binary will grow.  
I think less than with hand-writing parser because of its structure

> Another thing is how to integrate it
> with the command line.
>
>  
I know how to write it and if you have no objection I'll do it.

> Thanks,
> Marco
>
>
>
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