honey-biscuit-workshop/workshop-baker/benches/parser_bench.rs

use criterion::{Criterion, black_box, criterion_group, criterion_main};
use std::fs;
use std::path::Path;

fn parse_large_script(c: &mut Criterion) {
    let script_path = Path::new("/tmp/bench_large.sh");

    let script_content = fs::read_to_string(script_path)
        .expect("Failed to read benchmark script. Run `python3 benches/generate.py` first.");

    let byte_size = script_content.len();
    let line_count = script_content.lines().count();

    println!("Benchmark file: {} lines, {} bytes", line_count, byte_size);

    c.bench_function("parse_script_large", |b| {
        b.iter(|| {
            let result =
                workshop_baker::bake::parser::parse_script(black_box(&script_content.clone()));
            black_box(result)
        });
    });
}

fn parse_medium_script(c: &mut Criterion) {
    let script_path = Path::new("/tmp/bench_medium.sh");

    let script_content = fs::read_to_string(script_path)
        .expect("Failed to read benchmark script. Run `python3 benches/generate.py` first.");

    c.bench_function("parse_script_medium", |b| {
        b.iter(|| {
            let result =
                workshop_baker::bake::parser::parse_script(black_box(&script_content.clone()));
            black_box(result)
        });
    });
}

fn parse_small_script(c: &mut Criterion) {
    let script_path = Path::new("/tmp/bench_small.sh");

    let script_content = fs::read_to_string(script_path)
        .expect("Failed to read benchmark script. Run `python3 benches/generate.py` first.");

    c.bench_function("parse_script_small", |b| {
        b.iter(|| {
            let result =
                workshop_baker::bake::parser::parse_script(black_box(&script_content.clone()));
            black_box(result)
        });
    });
}

criterion_group!(
    benches,
    parse_small_script,
    parse_medium_script,
    parse_large_script
);
criterion_main!(benches);