A lot of people put opening semicolons on a new line, including the
Rhino authors.
How would semicolon insertion in this proposal interact with that
formatting convention?
var runnable = new java.lang.Runnable()
{
run: function ()
{
}
};
2010/6/8 Jürg Lehni <[email protected]>:
> This simple proposal is inspired by an extension of Rhino that currently
> allows to implement its syntax for anonymous Java interface implementation.
> Here an example that creates an anonymous class implementing the Runnable
> interface and defining the run method in an anonymous object literal that
> (mimicking a Java code block) immediately following the constructor call:
>
> var runnable = new java.lang.Runnable() {
> run: function() {
> }
> };
>
> When looking deeper into how Rhino achieves this syntax, I found out that it
> simply appends the following anonymous object literal to the list of
> arguments of whatever constructor came before. So the following code works in
> Rhino and prints the content of the hello string to the console:
>
> function Test(obj) {
> print(obj.hello);
> }
>
> new Test() {
> hello: 'Greetings, I am an anonymous object literal'
> };
>
> For the Illustrator scripting plugin http://scriptographer.org I came up with
> the convention to (ab)use this non-standard feature to allow setting of
> properties on freshly created objects, by extending the underlying Java proxy
> objects to automatically detect such a passed object literal, iterate through
> its properties and set them on the newly created object (In Scriptographer it
> is then also removed from the argument list). Soon it became apparent that
> this is very useful and also leads to cleaner code. I therefore started to
> wonder if this would make sense as an syntax extension in ES5. Here another
> example.
>
> function MyConstructor(param) {
> print(param); // Should not print the object literal
> }
>
> var obj = new MyConstructor() {
> property: 'This will be automatically set on the created object'
> };
>
> print(obj.property); // 'This will...created object'
>
> So far I cannot see any syntax conflicts.
>
> I am wondering what you all think of this proposal and look forward to your
> thoughts.
>
> Jürg
> _______________________________________________
> es-discuss mailing list
> [email protected]
> https://mail.mozilla.org/listinfo/es-discuss
>
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