Re: [Jscheme-user] Compiled Macros

[Geoffrey K. <ge...@kn...>]

In DrScheme, when you select another "language," it seems to forget any 
acquired language features and revert to a base level of functionality 
before loading on the new functionality.

On Thursday, September 5, 2002, at 09:45 AM, Ken Anderson wrote:

> I'm not opposed to a module approach, but what happens in Common Lisp 
> is that macros become part of the compiler's environment.  So when the 
> compiler compiles something it uses all the macros its seen.
>
> At 08:51 AM 9/5/2002, Timothy Hickey wrote:
>
>> On second thought, Graham's example points out the need for modules!
>> In Dr. Scheme, one can specify a "language" when importing a module.
>> The language is a collection of macros.
>>
>> I'll take a closer look at how the jscheme compiler handles macros
>> and report back to this list.
>>
>> It would be nice to have someway of indicating in the program code
>> that the program should be compiled using some set of macros.
>> One easy way would be to add an "include" command that would simply
>> include the macro code in the source before compiling, e.g.
>>
>> ;; macro2a.scm
>> (include "macro1.scm")
>> (define-macro (myplus2 a b)
>>   `(+ ,a ,b))
>> (.println java.lang.System.out$ (myplus1 1 2))
>> (.println java.lang.System.out$ (myplus2 1 2))
>>
>> This is essentially the way the C handles shared type declarations,
>> by storing them in .h files which are then included whereever they 
>> are needed.
>>
>> What do you think??
>> ---Tim---
>>
>>
>>>> At 07:24 PM 9/4/2002, Graham Spencer wrote:
>>>>> Hello,
>>>>>
>>>>> I think I've found a bug in JScheme version 5.0.0. Given the 
>>>>> following two files:
>>>>>
>>>>> ;; macro1.scm
>>>>> (define-macro (myplus1 a b)
>>>>>   `(+ ,a ,b))
>>>>>
>>>>> ;; macro2.scm
>>>>> (load "macro1.scm")
>>>>> (define-macro (myplus2 a b)
>>>>>   `(+ ,a ,b))
>>>>> (.println java.lang.System.out$ (myplus1 1 2))
>>>>> (.println java.lang.System.out$ (myplus2 1 2))
>>>>>
>>>>> If I compile both files to .class files and then run jscheme.REPL:
>>>>>
>>>>> Jscheme 5.0 04/05/2002 http://jscheme.sourceforge.net
>>>>> > (load "macro2.scm")
>>>>> 3
>>>>> 3
>>>>> #t
>>>>> > (macro2.load)
>>>>> (+ 1 2)
>>>>> 3
>>>>> #null
>>>>>
>>>>> The (load "macro2.scm") works as expected, but in (macro2.load), 
>>>>> the macro defined in macro1.scm is expanded but not evaluated. In 
>>>>> general, I cannot get macros defined in one compiled .class file 
>>>>> to work in another file. Am I doing something wrong, or is this 
>>>>> really a bug?
>>>>>
>>>>> (My apologies if I should have posted this bug report somewhere 
>>>>> else.)
>>>>>
>>>>> Thanks for your help,
>>>>>
>>>>> --g
>>>>
>>>>
>>>>
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>>
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>
>
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--
Geoffrey S. Knauth				http://knauth.org/gsk