Challenge 2 of the University of Southampton Space Cadets program.
The barebones language is based on four instructions:
Set a variable to zero.
clear var;
Add one to a variable.
incr var;
Subtract one from a variable.
decr var;
Loop until var is 0.
while var not 0 do; ... ... end
This project is an interpreter for this very simple language.
There is also a compiler built in (see the -c flag) and bytecode executor (the program automatically figures out which one to use).
Running the program:
java -jar Challenge-2.jar filename
Important notes: The interpreter is fairly forgiving: if a variable doen't exist, it is assumed to equal zero.
Command line switches:
-v = Turns the extra printing OFF (this will only print at the end).
-t = Time the execution of a script.
-c = Compile the input file into bytecode and saves it
-j = Just-In-Time compiler (compiles the input and runs the bytecode).
NOTE: These switches cannot be combined in the way you'd expect (so -vt is invalid, it must be specified as -v -t).