evidlo/sforth

Stupid forth implementation

Stupid Forth

This is a dumb forth implementation I wrote in an hour without doing any research. It has the following features

• int1 int2 add - add two numbers
• int1 int2 sub - subtract two numbers
• int1 int2 mul - multiply two numbers
• int1 int2 div - divide two numbers
• N dup - duplicate the last N items on the stack
• printstack - print the entire stack
• N repeat - repeat the last item on the stack N times
• print - print the last item on the stack

Strings must be surrounded by " and cannot contain spaces. Symbol groups must be surrounded by {}

Examples

Print the first 20 Fibonacci numbers

1 1
{ 2 dup add } 20 repeat
printstack

>>> %run sforth.py fib.sf
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711]