loris1123 / rbscheme Goto Github PK

Try to show where the syntax mistake was.
Something like:

==============================================

Scheme Error

----------------------------------------------

Invalid Syntax: 2.3.
                   ^
==============================================

Symboltable still uses rubys list

When calling cdr-function you get a bracket around the cdr.

(cdr (cons 1 2))
    => 2)

When writing scheme code it would be cool to do something like this:

(define (plusone x)
    (+ x 1)
)

At the moment only single-line is allowed:

(define (plusone x) (+ x 1))

If you input (cons 1 2) (cons 2 3) only the first cons will be evaluated

(abs "foobar")

=> Undefined Variable

calling -4 results in a Unknown Variable.
Workaround:

(define -4 (- 4 8))               # Thats awesome...

Objects like true, false, nil, void should exist only one time.
At the moment, every time I enter #t a new SchemeTrue object is generated.

Is it actually working?

Create a history for interactive mode to nagivate with ArrowUp/Down to previous inputs

The result when evaluation a statement in GUI will be printed to the console, instead of the GUI.

This is a result of the new printer

Tail Call Optimization should be enabled for RbScheme.

To enable TCO in Ruby use this:

RubyVM::InstructionSequence.compile_option = {
  tailcall_optimization: true,
  trace_instruction: false
}

I have to debug if this will enable TCO in my Scheme-Recursions. For this I first have to do #10

Add floatnumbers and their aritmetics

(define (fac n)(if (eq? n 1) 1 (* n (fac (- n 1)))))

This is a working faculty function using recursion. When I enter this I get the error Invalid number of arguments for SchemeDefine. Need between 2 and 2. Got 5, which is obviously wrong.

+-*/ allow only 2 arguments

(+ 2 2)

Original scheme allows an undefine number of arguments.

(+ 1 2 3 4 5)

Current workaround:

(+ 1 (+ 2 (+ 3 (+ 4 5))))

Defining a function or variable will result in a print.
But when doing a define, scheme should not print. It should be only printed when the function/variable is actually called

Not working:

(define (aFunc x y)
  (define (bFunc a b)
    (+ a b))
  (bFunc x y))

define allows only 1 argument as a function body. Should allow * expressions.