Re: [Jscheme-devel] Re: new quasi-string was Re: [Jscheme-user] using JScheme ....

[Timothy J. H. <ti...@cs...>]

On May 24, 2004, at 10:40 AM, Rahul wrote:

> Hi,
>
>> There is a relatively simple approach to this problem that doesn't 
>> require backquoting...
>> The idea is just to escape into a regular quoted string with [" ..... 
>> "]
>> e.g.
>
> 	That solution would help very much though we would still need to 
> escape the inner quotes.
You might be able to use single quotes in place of double quotes....

Yet another possibility would be to use #{      }# to denote quoted 
strings
where } can appear with in the quoted string, but you would have to 
backslash any appearance of }#
This is lexically similar to the mzscheme style multi-line comments   
#| ...... |#

The downside: it adds two additional characters to a string and it 
introduces # as a terminating symbol
for the first time, and it still requires one to backslash square 
brackets, which arise in javascript code...

The upside: it is very simple to implement and is backwards compatible.

Maybe  use     #[    ]# as escapes into Scheme for these 
#-quasi-strings...

For example, we could include the following chunk of Javascript from 
google
as follows:

(define (js-string zzz)
#{
<script>
<!--
function qs(el)
   {if (window.RegExp && window.encodeURIComponent)
        {var qe=encodeURIComponent(document.f.q.value);
         if (el.href.indexOf("q=")!=-1)
            {el.href=el.href.replace(new RegExp("q=[^&$]*"),"q="+qe);}
         else
            {el.href+="&q="+qe;}}return 1;}
// --> #[zzz]#
</script>
}#
)

where the curly braces, square brackets, and various quotes don't need 
to be quoted
and where I've inserted a gratutitous argument using the #[...]# 
notation.

I'm starting to like this approach. It is easy to understand, easy to 
implement, and handles
95% of the interesting cases (CSS quoting, javascript quoting, probably 
also SQL and Jython quoting).


---Tim---



>  ( quotes are Present often in js but not as common as the { } and [ ] 
> ,so i guess escaping them wont be that messy)
>
> ~Rahul
> -- 
> /*With eyes that speak of the Stars,
> and magick my very soul,
> A Dragon I am Eternal.*/
>
>
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