Beesafe

A small interpreted language written in Rust: hand-written lexer, Pratt parser, tree-walking evaluator, and a mark-sweep garbage collector. Built to explore how languages work end to end.

define add(a, b) {
    return a + b
}

init xs = [3, 1, 2]
print(add(len(xs), 1))   // 4

Getting started

Prerequisites: Rust (edition 2021).

cargo run                  # REPL
cargo run -- program.bs    # run a file
cargo test

The REPL highlights as you type, completes names, and echoes expression results. Ctrl-C cancels the current entry; Ctrl-D exits.

Notes

• Garbage collected in safe Rust; no unsafe.
• No closures, break/continue, or floats yet. Blocks don't introduce scopes; function calls do.
• Diagnostics via miette and thiserror.
• A work in progress; syntax and semantics may change.