First version of the ASTDebugger on master

Hi guys,

If you clone the master repo, you can see the new ASTInterpreter and
ASTDebugger classes.

The ASTInterpreter is able to interpret Amber code without compiling it
into JS. The debugger, a subclass of the interpreter, has stepping
capabilities.

While it's not 100% working yet (the tests show that the interpret
supports most of the language already), you can give it a try with the
SUnit tests, or by running something like the following:

    | ast debugger |
    ast := Smalltalk current parse: 'foo 1 + 2 + 4'.
    (SemanticAnalyzer on: Object) visit: ast.

    debugger := ASTDebugger new
        context: (AIContext new receiver: Object new; yourself);
        interpret: ast nodes first;
        yourself.
       
    debugger step; step.
    debugger step; step.
    debugger result."Answers 1"
    debugger step.
    debugger result. "Answers 3"
    debugger step.
    debugger result. "Answers 7"
   

Cheers!
Nico

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Wow! Seems, Amber becomes a quite usable system. A suggestion to implement:

http://www.kickstarter.com/projects/ibdknox/light-table

Should enormously raise acceptance for beginners and in education.

Price of worth - see kickstarter! ;-)

Have fun!

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