Monty 0.98 is a scripting language that is first compiled into monty byte codes (Just like python). It relies on a unique stack, with specific instructions to manipulate it. monty is an interpreter built specially for the said Monty Bytecodes files.

This is a language that contains specific instructions to manipulate data information (stacks or queues), where each instruction (called opcode) is sended per line. Files which contains Monty byte codes usually have the .m extension.

Example (file.m):

$ cat file.m
# Pushing element to the stack
push 0
push 1
push 2
# Printing all elements
pall
push 3
push 4
pop
# Rotating the stack to the bottom
rotr
pall
rotl
# Setting FIFO
queue
push 5
# Setting LIFO
stack
push 5
$

• Interpreter was written with C language
• C files are compiled using gcc 4.8.4
• C files are written according to the C90 standard
• Tested on Ubuntu 20.04 LTS

To compile all files:

$ gcc -Wall -Werror -Wextra -pedantic *.c -o monty
$

The synopsis of the interpreter is the following:

$ ./monty [filename]
$

To run the interpreter:

$ ./monty file.m
2
1
0
0
3
2
1
$

monty executes the following opcodes:

Comments, indicated with #, are not executed by the interpreter.

When a nonextistent opcode is passed, the interpreter prints an error message and stops:

$ cat errorfile.m
push 1
pint
pcx
$ ./monty errorfile.m
1
L3: unknown instruction pcx

When there is no errors, monty returns 0. Otherwise, returns 1