[Jscheme-devel] Re: [Jscheme-user] Hash-Quasi-Strings and Fixed Modulo Primitive

[Timothy J. H. <tim...@ma...>]

On Jun 16, 2004, at 4:50 PM, Ken Anderson wrote:

> This is good!  Is it easier to do #{ #} rather than the more 
> "synmetric"
> #{ ... }#?
The idea was to use # to prefix new tokens.
We could however have used
#{ and }# for strong quasi-strings and used
[# and #] for escapes from strong quasi-strings.

With this other alternative the example would be as follows:

> > (define  (prog version)
>  #{
>       public class Test {
>          int [] a = new int[] { 1,2,3,4,5};
>          String version = "[#version#]";
>
>         public static void main(String[] args) {;}
>      }
>  }#
> )
> (lambda prog (version)...)

I guess my feeling was that it might get confusing for people to 
remember
whether we were using #{... }#  or {#....#}
and if we escaped with #[...]# or [#...#]
So having a simple HASH-SYMBOL syntax for each delimiter makes it 
somewhat easier
to remember...

---Tim---




> I'd prefer the second form if it isn't too hard, but i guess your way 
> might be slightly faster if there are lots of } in the string.
>
> k
> At 04:30 PM 6/16/2004 -0400, you wrote:
>> I've fixed the modulo bug in the latest CVS.
>>
>> Also, I've added hash-quasi-strings which I'll describe in more 
>> detail later tonight.
>> The idea is that you use #{ and #} to indicate a hash-quasi-string 
>> and then you
>> can escape into scheme using #[ and #]
>>
>> This will allow us to easily quote general strings.
>>
>> The advantage here is that the hash-quasi-string can contain curly 
>> braces and square braces
>> and double quotes, without needing to "quote" them, thus you can use 
>> it go generate C or CSS
>>
>>
>> e.g. this can be used as follows to generate a string representing a 
>> Java class with
>> a user-supplied version string...
>>
>>>> (define  (prog version)
>>> #{
>>>      public class Test {
>>>         int [] a = new int[] { 1,2,3,4,5};
>>>         String version = "#[version#]";
>>>
>>>        public static void main(String[] args) {;}
>>>     }
>>> #}
>>> )
>>> (lambda prog (version)...)
>>
>>>> (prog "abc 6/16/04")
>>> "\n      public class Test {\n         int [] a = new int[] { 
>>> 1,2,3,4,5};\n         String version = \"abc 6/16/04\";\n     \n
>>> public static void main(String[] args) {;}\n     }\n "
>>
>>>> (begin (display (prog "abc 6/16/04")) (newline) (newline) 'yes)
>>>
>>>      public class Test {
>>>         int [] a = new int[] { 1,2,3,4,5};
>>>         String version = "abc 6/16/04";
>>>
>>>        public static void main(String[] args) {;}
>>>     }
>>>
>>>
>>> yes
>>
>> ---Tim---
>>
>> P.S. if this breaks any code please tell me.
>> It shouldn't have any effect unless you use #{ #} #[ #] somewhere
>> in your code....
>>
>>
>> On Jun 16, 2004, at 4:15 PM, Borislav Iordanov wrote:
>>
>>> Hmm, I'm not sure. It seems % is the same as "remainder"...
>>>
>>> Thanks,
>>> Borislav
>>>
>>> | -----Original Message-----
>>> | From: jsc...@li...
>>> | [mailto:jsc...@li...] On Behalf
>>> | Of Ken Anderson
>>> | Sent: Wednesday, June 16, 2004 3:54 PM
>>> | To: Borislav Iordanov
>>> | Cc: jsc...@li...
>>> | Subject: Re: [Jscheme-user] Modulo function
>>> |
>>> |
>>> | Yes, its broken.  For now use
>>> | > (% 0 5)
>>> | 0
>>> | > (% 7 5)
>>> | 2
>>> | >
>>> | At 03:33 PM 6/16/2004 -0400, Borislav Iordanov wrote:
>>> | >Hi,
>>> | >
>>> | >I noticed in Jscheme that:
>>> | >
>>> | >(modulo 0 5) => 5
>>> | >
>>> | >Is this normal behavior?
>>> | >
>>> | >Thanks,
>>> | >Borislav
>>> | >
>>> | >
>>> | >
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