On Sun, Sep 18, 2011 at 3:40 AM, Meikel Brandmeyer <m...@kotka.de> wrote:
>> Var keyword = RT.var("clojure.core", "keyword");
>> Var hashMap = RT.var("clojure.core", "hash-map");
>> hashMap.invoke(keyword.invoke("foo"), 1, keyword.invoke("bar"), x);
>
> This one is more simple. This is clojure code.
Since I've ended up discussing it with a few people here at The
Strange Loop, I thought it opportune to provide an example of interop
into CFML (another dynamic scripting language on the JVM), using a
little bridge library I created:
// assumes x is declared with some value...
// variables.clj contains the root Clojure "binding":
var core = variables.clj.clojure.core;
var result = variables.clj.myns.foo( core.hash_map( core.keyword( "a"
), 1, core.keyword( "bar" ), x ) );
The bridge injects a specified set of namespaces into the root binding
so they can be accessed as a nested structure with a "method missing"
style mechanism used to sugar-coat the calls to invoke(). _ is
automatically translated to - in symbols.
We use a convention that namespace._sym() returns a reference to
namespace/sym whereas namespace.sym() calls (namespace/sym) - with
namespace._("sym") for symbols that aren't valid CFML identifiers.
That allows us to do stuff like:
var data = [ 1, 2, 3, 4, 5 ]; // native CFML array
var result = core.map( core.partial( core._("*"), 3 ), data );
for (var elem in result) {
// realizes result of map as each elem value is obtained
writeOutput( elem & "<br />" );
}
Whilst not as clean as pure Clojure, it allows for great interop as
well as exposing a lot of the power of Clojure directly into our CFML
code (and, yes, for anyone who thought CFML was all <tags> there is a
full "JavaScript-like" scripting language in there too!). We run all
our CFML code on the JBoss community project, Railo.
Behind the scenes it uses clojure.lang.RT and RT.var() and .invoke() /
.deref() for everything.
--
Sean A Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/
Railo Technologies, Inc. -- http://www.getrailo.com/
"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)
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