How to best implement a DSL?

[Robert M. Münch]

Hi, I'm seeking for ideas/comments/experiences how to best implement a 
DSL in D.

What I would like to do is something like this:

	... my D code ...

	my-dsl {
		... my multi-line DSL code ...
		trade 100 shares(x) when (time < 20:00) and timingisright()
	}


	... my D code ...


Some things that circle in my head:
* Can the D parser somehow be missued for a DSL? So I can skip all the 
generic features for types etc.?

* I could use a PEG grammer for parsing the DSL, but this leads to 
quite some overhead for a tiny DSL.

* For static DSL code I would like to use CTFE to convert it into D code
	* Does this requires a CTFE compatible PEG parser tookit?
	* Could I somehow call an external program during compilation which 
gets the DSL block as input and returns D code?

* For dynamic DSL code I think I need to create something like an interpreter
	* How can I reference D variables from DSL code? Is there a lookup 
meachnisam or do I have to create a dictonary?
	* Is it possible to populate such a dictonary via CTFE?


-- 
Robert M. Münch
http://www.saphirion.com
smarter | better | faster