nondescript

Nondescript is a nim implementation of lox (see https://craftinginterpreters.com) with large deviations.

Deviations from lox

NOT SOURCE COMPATIBLE WITH LOX
Everything is an expression, except variable declarations and break statements
- hence expressions can contain statements, so the stack is tracked inside the compiler, using compiler.stackCount
- uses different local representation than lox inside the compiler
- compiler.addLocal also has a delta argument - check it out if interested
1 file = 1 chunk
- function objects are just a pointer to an instruction to jump to (right now instruction index, but this will change)
constant indexes, local indexes have 2 bytes as arguments
no object orientation
closures are not implemented yet
block expressions can be labelled and break takes a label to break out of
set block expression results using ^, ^label
set the return value of functions using ^result
plans for the far future: defer, tables, lists

benchmarks/fib.nds

Requirements:

The 4 steps to a REPL:

git clone https://github.com/prod2/nondescript
cd nondescript
./build.sh
./nds