Smalltalk to Lisp Transformations

The Flash version of Vista Smalltalk is based on transformation of Smalltalk grammar to an equivalent set of Lisp s-expressions which are then executed by the interpreter.

Here are a number of examples generated by the current Smalltalk parser:

Smalltalk	Lisp
3 + 4 * 5	(* (+ 3 4) 5)
3 + (4 * 5)	(+ 3 (* 4 5))
X := ‘hello world’	(setq X “hello world”)
Transcript showcr: X	(send Transcript ’showcr- X)
[ :a :b | a * b ]	(lambda (a b) (* a b))
[ :a :b | a * b ] value: 7 value:9	(funcall (lambda (a b) (* a b)) 7 9)
7 < ( 3 + 5) iftrue: [ 'less than 8' ]	(cond ((< 7 (+ 3 5)) ((lambda nil “less than 8″))) (t))

The following special cases should be finished in the next couple of days:

• whileTrue:
• whileFalse:
• do:
• do:to:
• do:to:by:
• and:
• or:

Then I will begin integrating the Smalltalk interpreter with the class browser and the animation libraries.