>From yesterday:
(defmacro eval-in
"Eval a Clojure form in a different namespace and switch back to current
namespace.
Args:
code - Clojure form as string
ns - Target namespace as string"
[code ns]
`(do
(in-ns '~(symbol ns))
(let [ret# (eval '~(read-string code))]
(in-ns '~(ns-name *ns*))
ret#)))
user=> (def generator "(X 400 400)")
#'user/generator
user=> (def image (eval-in generator "clevolution.version.version0-1-1"))
CompilerException java.lang.ClassCastException: clojure.lang.Symbol cannot
be cast to java.lang.String, compiling:(NO_SOURCE_PATH:1)
user=> (def image (eval-in "(X 400 400)"
"clevolution.version.version0-1-1"))
#'user/image
So it's OK to pass the explicit string but not the symbol. What am I not
getting here?
-A
On Tue, Dec 18, 2012 at 12:48 AM, Alan Shaw <noden...@gmail.com> wrote:
> Now I do, and the macro worked!
> I believe I have a problem using the macro from a function, but leaving
> that for tomorrow.
>
> Thanks BG!
>
> -A
>
>
>
> On Tue, Dec 18, 2012 at 12:19 AM, Baishampayan Ghose <b.gh...@gmail.com>wrote:
>
>> Do you have target ns "clevolution.version.version0-1-1" required?
>>
>> -BG
>>
>> On Tue, Dec 18, 2012 at 1:38 PM, Alan Shaw <noden...@gmail.com> wrote:
>> > BG,
>> > The macro doesn't seem to do the trick. The function X is interned in
>> the
>> > target namespace, but:
>> >
>> > user=> (def image (eval-in "(X 400 400)"
>> > "clevolution.version.version0-1-1"))
>> > CompilerException java.lang.RuntimeException: Unable to resolve symbol:
>> X in
>> > this context, compiling:(NO_SOURCE_PATH:1)
>> >
>> >
>> > On Mon, Dec 17, 2012 at 11:53 PM, Alan Shaw <noden...@gmail.com> wrote:
>> >>
>> >> Oh yes, the something.something is fixed so I can just prepend it,
>> thanks.
>> >> (Hadn't noticed your macro takes the ns as a string!)
>> >>
>> >> -A
>> >>
>> >>
>> >>
>> >> On Mon, Dec 17, 2012 at 11:47 PM, Baishampayan Ghose <
>> b.gh...@gmail.com>
>> >> wrote:
>> >>>
>> >>> Alan,
>> >>>
>> >>> What you're asking for is to derive the ns "clojure.core" given only
>> >>> "core". Not sure if that's possible.
>> >>>
>> >>> The namespace constitutes the whole dotted structure and not just the
>> >>> last component, I am afraid.
>> >>>
>> >>> If the actual ns is something.something.version-0-1-1, then you need
>> >>> the string "something.something.version-0-1-1" and not just
>> >>> "version-0-1-1" [unless of course you have some other way of deriving
>> >>> it from info that's embedded in _your_ code or structure thereof].
>> >>>
>> >>>
>> >>> -BG
>> >>>
>> >>> On Tue, Dec 18, 2012 at 1:10 PM, Alan Shaw <noden...@gmail.com>
>> wrote:
>> >>> > Thanks BG, I'm trying that.
>> >>> > But I don't think it addresses how to get from the string
>> >>> > "version-0-1-1" to
>> >>> > the namespace something.something.version-0-1-1. How can I do that?
>> >>> >
>> >>> > -A
>> >>> >
>> >>> >
>> >>> >
>> >>> > On Mon, Dec 17, 2012 at 11:26 PM, Baishampayan Ghose
>> >>> > <b.gh...@gmail.com>
>> >>> > wrote:
>> >>> >>
>> >>> >> Alan,
>> >>> >>
>> >>> >> Something like this might work for you -
>> >>> >>
>> >>> >> (defmacro eval-in
>> >>> >> "Eval a Clojure form in a different namespace and switch back to
>> >>> >> current namespace.
>> >>> >>
>> >>> >> Args:
>> >>> >> code - Clojure form as string
>> >>> >> ns - Target namespace as string"
>> >>> >> [code ns]
>> >>> >> `(do
>> >>> >> (in-ns '~(symbol ns))
>> >>> >> (let [ret# (eval '~(read-string code))]
>> >>> >> (in-ns '~(ns-name *ns*))
>> >>> >> ret#)))
>> >>> >>
>> >>> >> Warning - I haven't really tested this code.
>> >>> >>
>> >>> >> -BG
>> >>> >>
>> >>> >> On Tue, Dec 18, 2012 at 12:37 PM, Alan Shaw <noden...@gmail.com>
>> >>> >> wrote:
>> >>> >> > Thanks, Las!
>> >>> >> >
>> >>> >> > Ok say I have a file in which there is string such as
>> >>> >> >
>> >>> >> > "(- (atan (bw-noise 902 2 0.7604615575402431 400 400))
>> >>> >> > (read-image-from-file
>> >>> >> > \"images/Dawn_on_Callipygea.png\"))"
>> >>> >> >
>> >>> >> > and another
>> >>> >> >
>> >>> >> > "version-0-0-1"
>> >>> >> >
>> >>> >> > and I have a namespace version-0-0-1 into which functions named
>> atan
>> >>> >> > etc.
>> >>> >> > are all :referred. I want to evaluate the expression in that
>> >>> >> > particular
>> >>> >> > context, and not remain there when I'm done.
>> >>> >> >
>> >>> >> > -A
>> >>> >> >
>> >>> >> >
>> >>> >> >
>> >>> >> > On Mon, Dec 17, 2012 at 11:00 PM, László Török <
>> ltoro...@gmail.com>
>> >>> >> > wrote:
>> >>> >> >>
>> >>> >> >> ah, sorry, it's a bit early for me
>> >>> >> >>
>> >>> >> >> (in-ns (ns-name user-ns))
>> >>> >> >>
>> >>> >> >> if you could post a simple example for the second part of your
>> >>> >> >> question
>> >>> >> >> I
>> >>> >> >> maybe able to help.
>> >>> >> >>
>> >>> >> >> Las
>> >>> >> >>
>> >>> >> >> Alan Shaw 2012. december 18., kedd napon a következőt írta:
>> >>> >> >>
>> >>> >> >>> Ah no, that puts me in a new user-ns namespace! Not what I
>> wanted!
>> >>> >> >>>
>> >>> >> >>>
>> >>> >> >>> On Mon, Dec 17, 2012 at 10:51 PM, László Török
>> >>> >> >>> <ltoro...@gmail.com>
>> >>> >> >>> wrote:
>> >>> >> >>>>
>> >>> >> >>>> Try (in-ns 'user-ns)
>> >>> >> >>>>
>> >>> >> >>>> Las
>> >>> >> >>>>
>> >>> >> >>>> On Dec 18, 2012 7:50 AM, "Alan Shaw" <noden...@gmail.com>
>> wrote:
>> >>> >> >>>>>
>> >>> >> >>>>> user=> *ns*
>> >>> >> >>>>> #<Namespace user>
>> >>> >> >>>>> user=> (def user-ns *ns*)
>> >>> >> >>>>> #'user/user-ns
>> >>> >> >>>>> user=> user-ns
>> >>> >> >>>>> #<Namespace user>
>> >>> >> >>>>> user=> (in-ns user-ns)
>> >>> >> >>>>> ClassCastException clojure.lang.Namespace cannot be cast to
>> >>> >> >>>>> clojure.lang.Symbol clojure.lang.RT$1.invoke (RT.java:226)
>> >>> >> >>>>>
>> >>> >> >>>>> It appears I'm not understanding how namespaces are
>> represented.
>> >>> >> >>>>>
>> >>> >> >>>>> Also, is it just wrong of me to want to remember a namespace
>> I
>> >>> >> >>>>> was
>> >>> >> >>>>> working in and try to go back to it later?
>> >>> >> >>>>>
>> >>> >> >>>>> The slightly larger context is: I'm saving an s-expression
>> with
>> >>> >> >>>>> unqualified names in it into a file as a string. Also saving
>> a
>> >>> >> >>>>> string
>> >>> >> >>>>> indicating the name of the environment in which that string
>> >>> >> >>>>> should
>> >>> >> >>>>> be (read
>> >>> >> >>>>> and) eval'ed so that the names will resolve to the
>> appropriate
>> >>> >> >>>>> functions.
>> >>> >> >>>>> Advice on managing this would be appreciated.
>> >>> >> >>>>>
>> >>> >> >>>>> -Alan Shaw
>> >>> >> >>>>>
>> >>> >> >>>>> --
>> >>> >> >>>>> You received this message because you are subscribed to the
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>> >>> >> >>>
>> >>> >> >>>
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>> >>> >> >>
>> >>> >> >>
>> >>> >> >> --
>> >>> >> >> László Török
>> >>> >> >>
>> >>> >> >> --
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>> >>> >> >> Note that posts from new members are moderated - please be
>> patient
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>> >>> >> >> your first post.
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>> >>> >> >> For more options, visit this group at
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>> >>> >> >
>> >>> >> >
>> >>> >> > --
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>> >>> >> > Note that posts from new members are moderated - please be
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>> >>> >> > your
>> >>> >> > first post.
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>> >>> >>
>> >>> >>
>> >>> >>
>> >>> >> --
>> >>> >> Baishampayan Ghose
>> >>> >> b.ghose at gmail.com
>> >>> >>
>> >>> >> --
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>> >>> >
>> >>> >
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>> >>>
>> >>>
>> >>> --
>> >>> Baishampayan Ghose
>> >>> b.ghose at gmail.com
>> >>>
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>> >>
>> >>
>> >
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>>
>>
>> --
>> Baishampayan Ghose
>> b.ghose at gmail.com
>>
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