Current state attached.
2009/12/17 Marius <marius.dan...@gmail.com>
> Let me know when you have something.
>
> Br's,
> Marius
>
> On Dec 17, 8:58 am, Naftoli Gugenheim <naftoli...@gmail.com> wrote:
> > I'm thinking of an approach to writing a DSL with a much cleaner syntax.
> I'll try to put something together.
> >
> > -------------------------------------
> >
> > Marius Danciu<marius.dan...@gmail.com> wrote:
> >
> > All,
> >
> > I just want to see if there is any interest in the approach discussed
> here.
> > As you know Lift has some interesting support for building JavaScript
> > constructs from Scala code usig JsExp, JsCmd etc classes. I used quite a
> lot
> > this support and it's great but if your JS code that you want to send
> down
> > to the browser (say as an Ajax or Comet partial update response) gets a
> bit
> > more complicated then constructing the JS fragment leads IMO to some
> > cumbersome Scala code. I found myselft in quite a few situation to use
> JsRaw
> > to write the JavaScript fragment in order for the code reader to
> understand
> > what JavaScript code will be generated. But of course with JsRaw we put
> > everything into a String so I'm not a big fan of this approach. So I
> started
> > to define a JavaScript like "DSL" that IMO is closer to JavaScript form.
> > Attached is a source code smaple of how this looks like, so for instance
> we
> > can have something like:
> >
> > val js = JsFunc('myFunc, 'param1, 'param2) {
> > JsIf('param1 __< 30) {
> > Var('home) := Wrap(234 __- 3) __/ 2 `;`
> > Var('someArray) := JsArray(1, 2, 3, 4, 5) `;`
> > 'myFunc(1, 2, "do it", 'home) `;`
> > $("#myID") >> 'attr("value", "123") `;`
> > } ~
> > JsForEach(Var('i) in 'someArray) {
> > 'console >> 'log("Hi there " __+ 'i) `;`
> > } ~
> > JsAnonFunc('arg1, 'arg2) {
> > 'alert("Anonymous function " __+ 'arg1 __+ 'arg2)
> > }(1, 2) `;`
> > }
> >
> > println(js.toJs)
> >
> > this yields the following JavaScript code:
> >
> > function myFunc( param1, param2 ) {
> > if (param1 < 30) {
> > var home = ( 234 - 3 ) / 2;
> > var someArray = [ 1, 2, 3, 4, 5 ];
> > myFunc(1, 2, "do it", home);
> > $("#myID").attr("value", "123");}
> >
> > for (var i in someArray) {
> > console.log("Hi there " + i);}
> >
> > function ( arg1, arg2 ) {
> > alert("Anonymous function " + arg1 + arg2)
> >
> > }(1, 2);
> > }
> >
> > ... ok I just droped nonsense code in there for exemplification. A few
> > words:
> >
> > 1. JsIf, JsForEach describe JavaScript if and for(each) statements
> > 2. Functions like __<, __>, ... __+, __- are function that alows
> definition
> > of boolean and/or algebraic expressions.
> > 3. Wrap just wraps an expression into ()
> > 4. Var defined a variable
> > 5 := defines an assignment
> > 6. JsFunc declares a JS function
> > 7. JsAnonFunc declares an anonymous function
> > 8. 'myFunc(1, 2, "do it", 'home) is simply a javascript function
> invocation
> > by providing 4 parameter.
> > 9. ~ is just a function that chains statements that don;t necessarily end
> in
> > ;
> >
> > Do you think that something like this would be usable in Lift?
> >
> > Br's,
> > Marius
> >
> > --
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DSL.scala
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