stack-machine-go

Implementation of an interpreter for a simple stack machine language.

The language specification is very simple:

Stack Manipulation

• PUSH <number>: pushes a number.
• POP: pops a number.
• DUP: pushes a duplicate of the value at the top of the stack.
• SWAP: pops two numbers and psuhes them back in reverse order.

Operations

• ADD: pops two numbers, sums them and pushes the result.
• SUB: pops two numbers, substracts them and pushes the result.
• MUL: pops two numbers, multiplies them and pushes the result.
• DIV: pops two numbers, divides them and pushes the result.

Control flow

• IFEQ <line>: examines the top number. If the value is 0, continues. Else, it jumps to the specified line number.
• JUMP <line>: jumps to the specified line number.

Printing options

• PRINTN: prints the value at the top of the stack as a number.
• PRINTI: prints the value at the top of the stack as an integer.
• PRINTC: prints the value at the top of the stack as a character (it casts the number to an integer and prints the ASCII representation of it).

To keep things simple, only one instruction will be interpreted per line.

Lines starting with # will be ignored (comments)