In addition (or instead, if this is good enough and less painful), you
could use a compile-time helper function like:
(define-for-syntax (make-mb+ti namespaces-stx
lang-print-names-stx)
(define-syntax-class to-run
#:attributes (parsed)
#:literals (TEST)
(pattern (TEST e r ...)
#:with parsed
#`(test-output 'e (list 'r ...) #,namespaces-stx))
(pattern e
#:with parsed
#`(show-output 'e #,namespaces-stx #,lang-print-names-stx)))
(values (syntax-parser
#:track-literals
[(_ :to-run ...)
#'(#%printing-module-begin parsed ...)])
(syntax-parser
#:track-literals
[(_ . :to-run)
#'(#%top-interaction . parsed)])))
-Philip
On Mon, Aug 31, 2020 at 1:39 PM Shriram Krishnamurthi <s...@cs.brown.edu>
wrote:
> Oooh, that's pretty clever! A bit painful, but clever!
>
> On Mon, Aug 31, 2020 at 1:32 PM Philip McGrath <phi...@philipmcgrath.com>
> wrote:
>
>> There might be a better way, but I'd probably make a language for writing
>> this kind of module, in the spirit of `#lang syntax/module-reader`, where
>> its `#%module-begin` would expect the module body to be `<THE ONLY PART
>> THAT CHANGES>`, similar to the way that the body of `(module reader
>> syntax/module-reader my-language-implementation-module)` is a module name.
>>
>> -Philip
>>
>>
>> On Mon, Aug 31, 2020 at 1:24 PM Hendrik Boom <hend...@topoi.pooq.com>
>> wrote:
>>
>>> On Mon, Aug 31, 2020 at 10:06:42AM -0700, Shriram Krishnamurthi wrote:
>>> > I'm having some trouble abstracting over this code. Any suggestions?
>>> >
>>> > I have numerous files that follow this boilerplate:
>>> >
>>> > #lang racket
>>> >
>>> > (require <LIBRARY FILE>)
>>> >
>>> > (provide (rename-out [mod-begin #%module-begin]
>>> > [ti #%top-interaction]))
>>> >
>>> > (define-values (namespaces lang-print-names)
>>> > <THE ONLY PART THAT CHANGES>)
>>> >
>>> > (define-syntax (multi-runner stx)
>>> > (syntax-case stx (TEST)
>>> > [(_ (TEST e r ...))
>>> > #`(test-output 'e (list 'r ...) namespaces)]
>>> > [(_ e)
>>> > #`(show-output 'e namespaces lang-print-names)]))
>>> >
>>> > (define-syntax mod-begin
>>> > (λ (stx)
>>> > (syntax-case stx ()
>>> > [(_ b ...)
>>> > #'(#%printing-module-begin (multi-runner b) ...)])))
>>> >
>>> > (define-syntax ti
>>> > (λ (stx)
>>> > (syntax-case stx ()
>>> > ([_ . e]
>>> > #'(#%top-interaction . (multi-runner e))))))
>>> >
>>> > I've abstract most of the details into `test-output` and `show-output`
>>> into
>>> > <LIBRARY FILE>. I would ideally like to move as much of what's left as
>>> > possible into the same file.
>>> >
>>> > The key problem is that the MB and TI depend on `multi-runner`, which
>>> in
>>> > turn depends on `namespaces`, which is a name at run time. As long as
>>> > everything is in the same module, no problem. But when I start to move
>>> the
>>> > boilerplate out…
>>> >
>>> > Concrete suggestions welcome — I've tried several different things
>>> (various
>>> > forms of abstraction, syntax parameters, etc.) without luck.
>>>
>>> Maybe a macro or two? Perhaps a nonhygienic one?
>>>
>>> -- hendrik
>>>
>>> >
>>> > Thanks,
>>> > Shriram
>>> >
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