About

A dynamically typed, object oriented interpreted language implementation in Java.
Inspired by Crafting Interpreters by Robert Nystrom

This version of the interpreter is implemented with a recursive descent parser and a tree walk style interpreter.
In simpler terms - it is orders of magnitude than python.
Calculating the 20th fibonacci number in python takes about 250ms, it took Reigai about 1500ms. Check test/speed for code.

Usage

• Clone the repository
• Use command make [file]
• Running command without file argument will run interpreter in REPL mode
• If the file argument is provided, the file will be interpreted.

You need to have a Java and Make installed.
Tested on Windows and Linux.

Documentation

Check this for documentation of the language.
There are a few features added in Reigai that are missing in Lox, with more coming.

Mod Operator

reiPL :> print 5 % 5;
0
reiPL :> print 10 % 8;
2

Returns the remainder after performing division.

Native Functions

Len

reiPL :> print len("Hello");
5

Returns the length of string provided.

Round, Floor, Ceil

reiPL :> print round(3.1415);
3
reiPL :> print floor(3.1415);
3
reiPL :> print ceil(3.1415);
4

Work as expected.

Abs

reiPL :> print abs(-6.28);
6.28

Works as expected.

Pow

reiPL :> print pow(2, 10);
1024

Raises first argument to second argument.