user=> (source special-symbol?)
(defn special-symbol?
"Returns true if s names a special form"
{:added "1.0"
:static true}
[s]
(contains? (. clojure.lang.Compiler specials) s))
nil
user=> (keys (. clojure.lang.Compiler specials))
(& monitor-exit case* try reify* finally loop* do letfn* if
clojure.core/import* new deftype* let* fn* recur set! . var quote catch
throw monitor-enter def)
On Wed, Jun 18, 2014 at 8:02 PM, Mark P <pierh...@gmail.com> wrote:
> Interesting - thanks!
>
> Looks like doing `symbol is a good way of telling whether something is a
> special symbol or not. If syntax-quote results in namespace-qualification
> it then it *is not* special (with the exception of import*); if it does
> not namespace qualify it, then it *is* special.
>
> Previously I've been using the fact that (source symbol) comes up with
> "Source not found" to indicate that a symbol might be special. But not
> sure how reliable this method is. I imagine there might be other
> situations where the source code cannot be found.
>
> Cheers,
>
> Mark.
>
>
> On Wednesday, June 18, 2014 6:26:04 PM UTC+9:30, Ambrose Bonnaire-Sergeant
> wrote:
>
>> Hi Mark,
>>
>> Here's a brief doc on special forms: http://clojure-doc.org/
>> articles/language/macros.html#special-forms-in-detail
>>
>> Thanks,
>> Ambrose
>>
>>
>> On Wed, Jun 18, 2014 at 12:13 PM, Mark P <pier...@gmail.com> wrote:
>>
>>> Thanks Tassilo for the explanation - much appreciated!
>>>
>>> I have been searching the web and searching clojure text books for the
>>> last two hours trying to find the answer to this same question. Finally I
>>> stumbled onto this thread!
>>>
>>> I realize that hiding the complexity of distinctions between fn / fn*
>>> and let / let* etc might make the documentation more accessible for some
>>> users, but for others (like me and presumably also Plínio) it makes it
>>> really hard to track down what is *really* going on. I wish this
>>> distinction was part of the formal documentation.
>>>
>>> Does anyone know of documentation anywhere that does include these kinds
>>> of distinction?
>>>
>>> Thanks,
>>>
>>> Mark.
>>>
>>> On Thursday, 6 March 2014 02:27:26 UTC+10:30, Tassilo Horn wrote:
>>>
>>>> Plínio Balduino <pbal...@gmail.com> writes:
>>>>
>>>> Hi Plínio,
>>>>
>>>> > Clojure.org says fn and let are special forms, but using the macro
>>>> > sourceshows that both are macros calling fn* and let* respectivelly.
>>>> >
>>>> > So fn and let are "special special forms", or clojure.org is
>>>> > incorrect/outdated?
>>>>
>>>> Well, they are correct from a user's point of view. One never uses the
>>>> real special forms fn* and let*.
>>>>
>>>> > If fn and let are really special forms and not macros, could you
>>>> > explain why?
>>>>
>>>> fn and let (and also loop) are macros around the real special forms fn*
>>>> and let* (and loop*) that add support for destructuring. For example,
>>>>
>>>> (let [[a b] [1 2]]
>>>> (+ a b))
>>>>
>>>> expands to
>>>>
>>>> (let*
>>>> [vec__8592 [1 2]
>>>> a (clojure.core/nth vec__8592 0 nil)
>>>> b (clojure.core/nth vec__8592 1 nil)]
>>>> (+ a b))
>>>>
>>>> where the destructuring has been transformed to "normal" code already.
>>>>
>>>> Bye,
>>>> Tassilo
>>>>
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