Quokka-interpeter

a custom interpeter implementation using Thorsten ball book. https://interpreterbook.com/

Use the Interperter(REPL)

clone the project:

git clone https://github.com/ImTheCurse/Quokka-interpeter.git

cd to directory:

cd Quokka-interpeter

compile and run:

cargo run

Table of Contents

• Syntax overview
• If
• Operators
• Variables
• Return
• Functions
• Literals

syntax-overview

let add = fn(x,y){
return x + y;
}
add(5,3); // we will get here 8.

If

Supports if + else but dosent support else if.

if(true){
  //do something
}else{
  //do alternative
}

Operators

Supports +, -, !, / , *, '' operators.

1 + 2 + (3 * 4) - (10 / 5);
!true;
!false;
-5;
'Hello' + ' ' + 'World';

Variables

We define variables using the let keyword. Foramt:

let <identifier> = <value>

let x = 5;

Return

returns the value as expected, can be used inside a block / function.

  let x = fn(){
    return 5;
  }
  x();

Functions

as seen before, we use functions in the following format:

fn (<parameter one>, <parameter two>, ...) { <block statement> };

let x = fn(){
      return 5;
    }

Literals

there are currently 3 data type which are: integer, boolen and strings, but I intend to add more in the near future. Integer:

1;
5;
let y = 7;

Boolen: true | false

let x = true;
if(x){
  //always execute this
}

String:

'<value>'

'hello world!'