Re: Scripting

[Serbinenko Vladimir <serbinenko.vova@list.ru>]

Marco Gerards wrote:

>Hollis Blanchard <hollis@penguinppc.org> writes:
>
>  
>
>>On Feb 13, 2005, at 12:56 PM, Marco Gerards wrote:
>>
>>    
>>
>>>Serbinenko Vladimir <serbinenko.vova@list.ru> 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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