logos-codegen 0.16.1

Create ridiculously fast Lexers
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

use insta::assert_snapshot;
use std::{error::Error, path::PathBuf};
use syn::parse_file;

#[rstest::rstest]
#[case("simple")]
#[case("no_error_lut")]
#[case("skip_callback")]
#[case("skip_callback_failure")]
#[case("error_callback0")]
#[case("error_callback1")]
#[case("error_callback_failure")]
#[case("prio_conflict")]
#[case("illegal_utf8")]
pub fn test_codegen(#[case] fixture: &str) -> Result<(), Box<dyn Error>> {
    let codegen_alg = if cfg!(feature = "state_machine_codegen") {
        "state_machine"
    } else {
        "tailcall"
    };
    let label = format!("{fixture}-{codegen_alg}");
    println!("Running case {label}");

    let input_dir_path = [env!("CARGO_MANIFEST_DIR"), "tests", "data", "codegen"]
        .iter()
        .collect::<PathBuf>();

    let input_path = input_dir_path.join(format!("{fixture}.rs"));
    let input = std::fs::read_to_string(input_path)?;

    let generated = logos_codegen::generate(input.parse()?).to_string();

    let formatted =
        prettyplease::unparse(&parse_file(&generated).expect("Logos output is unparseable"));

    assert_snapshot!(label, formatted);

    Ok(())
}