🌸 hana
hana is a small dynamically-typed scripting language written in Rust/C and is inspired by Pascal, Ruby and Javascript. It primarily supports prototype-based object orientation, dynamic arrays, first-class functions (with closure support). The interpreter comes useful features such as a simple mark-and-sweep garbage collector, exception handling and an import system.
haru, the Rust parser/runtime generates bytecode that runs on an optimised virtual machine written in C (about as fast as Python and Ruby!)
Installation
You'll need to have the cargo package manager and rust installed. You can then do:
cargo install haru
The interpreter called haru will be installed into your PATH.
Additional features
Additional features can be enabled by passing their names into
cargo's --features flag:
jemalloc: use the jemalloc memory allocatorcffi: enables the stdlib's C foreign interface (wip)
Running
Once built or installed, you can write hana code into a source file, then invoke the interpreter like this:
haru program.hana
Alternatively you could invoke a REPL for easier prototyping:
haru
For usage, pass the -h command:
usage: haru [options] [-c cmd | file | -]
options:
-c cmd : execute program passed in as string
-d/--dump-vmcode: dumps vm bytecode to stdout
(only works in interpreter mode)
-b/--bytecode: runs file as bytecode
-a/--print-ast: prints ast and without run
-v/--version: version
Examples
see /examples for more
Hello World
print("Hello World\n")
Variables
name = "Alice"
age = 20
print(name, " is ", age, " years old.\n")
Fibonacci numbers
// Regular recursive
fib(n) = n <= 1 ? 1 : fib(n-1) + fib(n-2)
print(fib(30), "\n")
// Faster recursive (with tail-call optimization!)
fibrec(n, prev, curr) = n <= 0 ? curr : fibrec(n-1, prev+curr, prev)
fib(n) = fibrec(n+1, 1, 0)
print(fib(50), "\n")
Documentation
see DOCUMENTATION.md
Building
(building was tested by using rust-nightly and gcc-4.8 on an x64 with Linux, mileage may vary on other architectures)
Just do:
cargo build --release
License
GPLv3 License