[evlan-devel] CVS Update: Interactive Interpreter!

[Kenton V. <tem...@ga...>]

I finally finished the interactive interpreter...  well, not finished, but 
it's working.  At present, the only way to execute Evlan code is to type it 
in at the prompt and run it.  Of course, only the kernel dialect is 
supported so far.

Here is an example of some code which I tested:

fib = x => result where
    loop = counter => last => last2 =>
       if counter.equals 1
          then last
          else loop (counter.subtract 1) (last.add last2) last
    result =
       if x.isLessThan 1
          then 0
          else loop x 1 0

I must say I'm rather surprised by how little debugging I have had to do to 
get things running as well as they are.  I expected to be debugging for 
days before code like the above worked!  :)

TODO:
    Short-term:
    - Revise language description
    - "Basic" dialect (mainly, adds arithmetic operators)
    - Bytecode loading and management
    - Very simple API facilities (containers, string ops, etc.)

    Medium-term:
    - Event system
    - "Process" dialect (? perhaps this should be delayed until the 
compiler is written in Evlan.  I don't think the compiler itself is in dire 
need of it.)
    - C native interface

    Long-term:
    - Rewrite compiler in Evlan.
    - Design API

-Kenton Varda