Cheers for the efforts, but that's a poor DSL or an atempt to create an Aspect-oriented version of Hack. You've gorgeous tools at facebook like for example 'pfff' [0] to play with ASTs, these could be used to build wonderful things given enough time. I suppose the ultimative goal is to allow business people to design workflows and let the tool generate the required code automatically. (I guess that's what Flow Based Programming is trying to achieve.) Kinda possibly with high-level specifications defined in languages better suited to the task like Racket, Rebol/Red, Xtend/Scala etc.

There is an interesting presentation by ThoughtWorks – Neil Ford: Building DSLs in Static and Dynamic Languages [1]

However I thought you might find this the EPFL / ETH Summer School on DSL Design and Implementation very useful. They not only come with presentations, but also code in Scala, Racket, Haskell et. al. I am currently working in a huge project with about >30 people working on building an MDD (Model Driven Development) platform for visually/declaratively writing things for the systems we use internally. These will be able to create models out of code and even fix API incompatibilities automatically. [2]

Excuse the Unicode, I got bored

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[0] https://github.com/facebook/pfff

[1] http://www.intertech.com/resource/usergroup/Neal_Ford-Buildi...

[2] http://vjovanov.github.io/dsldi-summer-school/program.html