monty
is an interpreter of Monty ByteCodes files, which is a scripting language just like Python.
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:
Opcode | Description |
---|---|
push |
Pushes an element to the stack |
pall |
Prints all the values on the stack |
pint |
Prints the value at the top of the stack |
pop |
Removes the top element of the stack |
swap |
Swaps the top two elements of the stack |
queue |
Sets the format of the data to a queue (FIFO) |
stack |
Sets the format of the data to a stack (LIFO) |
nop |
Doesn't do anything |
add |
Adds the top two elements of the stack |
sub |
Subtracts the top element of the stack from the second top element of the stack |
mul |
Multiplies the second top element of the stack with the top element of the stack |
div |
Divides the second top element of the stack by the top element of the stack |
mod |
Computes the rest of the division of the second top element of the stack by the top element of the stack |
pchar |
Prints the char at the top of the stack |
pstr |
Prints the string starting at the top of the stack |
rotl |
Rotates the stack to the top |
rotr |
Rotates the stack to the bottom |
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
- Diana Mbeja : GitHub