From: pjb@... (Pascal J. Bourguignon)
Date: 2009-02-26T06:24:22+09:00
Subject: Re: Nexus Programming Language

Brian Adkins <lojicdotcom@gmail.com> writes:

> pjb@informatimago.com (Pascal J. Bourguignon) writes:
>
>> ...
>> Here is for example how I generate C++ code from Ruby:
>>
>>       (class MapType
>>          (def makeToStringExpression(fieldAccess , mandatory , inVector = false , encoding = nil)
>>             (if mandatory
>>                (e = fieldAccess)
>>                (ib = [["." , e , :begin]])
>>                (ie = [["." , e , :end]])
>>              else
>>                (e = [[ "." , fieldAccess , :getValuePtr]]) 
>>                (ib = [["->" , e , :begin]])
>>                (ie = [["->" , e , :end]])
>>              end)
>>             (k = (@keyType     . makeToStringExpression(["->" , :i , :first]  , true , encoding)))
>>             (v = (@elementType . makeToStringExpression(["->" , :i , :second] , true , encoding)))
>>             (s = [:block ,
>>                   [:inline , "typedef " + (self . cxxPath) + " map_type;"] ,
>>                   (Cxx::Variable . new(:i , (Cxx::Type . new((self . cxxPath)+"::"+"const_iterator")) , ib)) ,
>>                   (Cxx::Variable . new(:e , (Cxx::Type . new((self . cxxPath)+"::"+"const_iterator")) , ie)) , 
>>                   [ "<<" , :s , " (map"] ,
>>                     [:for , [ nil , ["!=" , :i , :e],["post++",:i]] ,
>>                       [:block , ["<<", :s , " ("] , k , ["<<", :s , " . "] , v , ["<<", :s , ")"]]] , 
>>                    [ "<<" , :s , ")"]])
>>           end)
>>        end)
>
> Pascal, I'm curious about your use of parentheses above. Do you use
> them because it makes some things easier in your editor, 

Yes, definitely. I use emacs with paredit-mode.


> or to compare
> more directly with the Lisp example I elided, 

Not specifically, but it's a nice side effect.


> or simply to try and
> make your Ruby code look as much like Lisp as posisble, or ... ?

Yes, definitely.  It makes me feel if not at home, at least, at a
strange aunt's, vs. in a totally strange home in a totally strange
land.

-- 
__Pascal Bourguignon__