On Wed, Jun 28, 2023 at 09:32:36PM +0200, felix.winkelm...@bevuta.com wrote:
> But I still think that keeping an expansion/compile-time registry and
> accessing it using procedure macros (via "strip-syntax"ed identifiers
> to drop all renaming artifacts) is a possible solution.
I agree, that's
> On 28/06/2023 14:09, felix.winkelm...@bevuta.com wrote:
> >>
> >> (define-object-type bar
> >> (field-1 name-of-library#foo)
> >> (field-2 name-of-other-library#some-other-type))
> >>
> >> ...even though calling symbol-value on those symbols at run time works
> >> just fine. It seems
On 28/06/2023 14:09, felix.winkelm...@bevuta.com wrote:
I guess during expansion identifiers are renamed to some internal gensym
and thus not accessible by name (which is the whole point of a hygienic
macro system).
Oh, and as a side thing, I don't think this is exactly "unhygienic".
Well,
On 28/06/2023 14:09, felix.winkelm...@bevuta.com wrote:
(define-object-type bar
(field-1 name-of-library#foo)
(field-2 name-of-other-library#some-other-type))
...even though calling symbol-value on those symbols at run time works
just fine. It seems that the symbols imported into the
>
> (define-object-type bar
>(field-1 name-of-library#foo)
>(field-2 name-of-other-library#some-other-type))
>
> ...even though calling symbol-value on those symbols at run time works
> just fine. It seems that the symbols imported into the environment at
> macro expansion time are handled
On 23/06/2023 14:35, Kon Lovett wrote:
(symbol-value foo #f)
Error: unbound variable: foo
#;2> (symbol-value 'foo #f)
#f
(symbol-value foo #f) is asking for the symbol-value of the derefed variable
`foo’
Does anybody have any tips for using symbol-value at macroexpansion time?
I am trying
> On Jun 22, 2023, at 9:07 PM, Pan Xie wrote:
>
> Hello
>
> I am new to CHICKEN scheme and here is a (very) quick question of how to
> check whether a symbol is bound.
>
> I know it doable but I can't find the way.
>
> I don't find the methods from the main CHICKEN manual document. Then I
Hello,
if you are looking for record introspection capabilities, I would recommend
looking into SRFI-99[1], which combines static structure definition and
dynamic reflection APIs. You're example could look like this:
(import
(chicken format)
srfi-42
srfi-99)
(define-record-type egg-info
On Fri, Jun 23, 2023 at 04:01:40PM +0800, Pan Xie wrote:
> For example, if I want to do things shown in following codes, it is useful to
> get the
> interned symbols from their names and also get their bound procedures:
...[code elided]...
> I think it is a very common idiom in languages from
(define-record egg-info
name author desc)
(define (show-egg-info egg)
(define (symbol-value sym)
(##sys#slot sym 0))
(define (getter field-name)
(symbol-value
(string->symbol
(format #f "egg-info-~a"
field-name
(let ((fields
#+begin_quote
Perhaps if you can explain why you need to know if a symbol is bound or
unbound, we might be able to help you better achieve your goal.
#+end_quote
For example, if I want to do things shown in following codes, it is useful to
get the
interned symbols from their names and also get
On Fri, Jun 23, 2023 at 03:32:38PM +0800, Pan wrote:
> Ah, that make sense. It seems I can just use the '##sys#slot' procedure to
> accomplish all that tasks.
Please don't use ##sys#slot unless you know what you're doing - the
procedure is unsafe and will cause segmentation faults when used on
Ah, that make sense. It seems I can just use the '##sys#slot' procedure
to accomplish all that tasks. Would you please elaborate about the
"transformed name"? I see there are codes reference symbols like
"##sys#slot" or "scheme#list", but I can't find document describe them.
Is there any
Looks like unbound? and symbol-value take quoted symbols if passing them
directly: And for list you have to use the transformed name scheme#list
#;2> (unbound? 'x)
#t
#;3> (define x 1)
#;4> (unbound? 'x)
#f
#;5> (symbol-value 'x)
1
#;6> (symbol-value 'scheme#list)
#
On Thu, Jun 22, 2023 at 10:15
Hello
I am new to CHICKEN scheme and here is a (very) quick question of how to
check whether a symbol is bound.
I know it doable but I can't find the way.
I don't find the methods from the main CHICKEN manual document. Then I
import the "symbol-value-utils" module. I believe the "unbound?"
15 matches
Mail list logo
