roc/crates/compiler/test_syntax/src/bin/dump_syntax.rs

//! Dump a syntax tree for a given input file.
//!
//! Typical usage:
//! `cargo run --bin dump_syntax -- full file.roc`

use std::process::exit;

use bumpalo::Bump;
use test_syntax::test_helpers::InputKind;

fn main() {
    let args = std::env::args().collect::<Vec<String>>();
    if args.len() != 3 {
        eprintln!("Usage: {} [expr|full|moduledefs|header] <input>", args[0]);
        std::process::exit(1);
    }

    let kind = match args[1].as_str() {
        "expr" => InputKind::Expr,
        "full" => InputKind::Full,
        "moduledefs" => InputKind::ModuleDefs,
        "header" => InputKind::Header,
        _ => {
            eprintln!("Invalid input kind: {}", args[1]);
            std::process::exit(1);
        }
    };

    let text = std::fs::read_to_string(&args[2]).unwrap_or_else(|e| {
        eprintln!("Error reading file: {}", e);
        exit(1);
    });
    let input = kind.with_text(&text);
    let arena = Bump::new();
    let output = input.parse_in(&arena);
    eprintln!("memory used: {}", arena.allocated_bytes());
    println!("{:#?}", output);
}