doge-compiler 0.3.1

Compiler for the Doge programming language — lexer, parser, semantic checks, and Rust codegen.
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
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91

use std::path::PathBuf;

/// Absolute path to the repo-root `examples/` directory.
fn examples_dir() -> PathBuf {
    // CARGO_MANIFEST_DIR is crates/doge-compiler; examples/ is two levels up.
    PathBuf::from(env!("CARGO_MANIFEST_DIR"))
        .join("..")
        .join("..")
        .join("examples")
}

fn fixtures_dir() -> PathBuf {
    PathBuf::from(env!("CARGO_MANIFEST_DIR"))
        .join("tests")
        .join("fixtures")
}

#[test]
fn every_example_parses_and_checks() {
    let dir = examples_dir();
    let mut seen = 0;
    for entry in std::fs::read_dir(&dir).expect("examples directory should exist") {
        let path = entry.expect("readable dir entry").path();
        if path.extension().and_then(|e| e.to_str()) != Some("doge") {
            continue;
        }
        seen += 1;
        let name = path.display().to_string();
        let source = std::fs::read_to_string(&path).expect("readable example");

        let script = match doge_compiler::parse(&name, &source) {
            Ok(script) => script,
            Err(diag) => panic!("{name} should parse, but:\n{}", diag.render()),
        };
        if let Err(diag) = doge_compiler::check(&name, &source, &script) {
            panic!("{name} should check clean, but:\n{}", diag.render());
        }
    }
    // Guard against a silently wrong path finding zero files.
    assert!(seen > 0, "no .doge examples found in {}", dir.display());
}

#[test]
fn every_fixture_fails_with_the_expected_diagnostic() {
    // Each `<name>.doge` fixture is paired with a `<name>.expected` file holding
    // a substring its rendered diagnostic must contain. Both are auto-discovered,
    // so a new fixture needs no edit here — and a `.doge` without an `.expected`
    // (or vice versa) fails rather than being silently skipped.
    let dir = fixtures_dir();
    let mut seen = 0;
    for entry in std::fs::read_dir(&dir).expect("fixtures directory should exist") {
        let path = entry.expect("readable dir entry").path();
        if path.extension().and_then(|e| e.to_str()) != Some("doge") {
            continue;
        }
        seen += 1;
        let file = path.file_name().unwrap().to_string_lossy().into_owned();

        let expected_path = path.with_extension("expected");
        let expected = std::fs::read_to_string(&expected_path).unwrap_or_else(|_| {
            panic!("fixture {file} has no sibling {}", expected_path.display())
        });
        let expected = expected.trim();
        assert!(
            !expected.is_empty(),
            "{}: expected-diagnostic file is empty",
            expected_path.display()
        );

        let source = std::fs::read_to_string(&path).expect("readable fixture");

        // A fixture fails at either the parse or the check stage; run both.
        let rendered = match doge_compiler::parse(&file, &source) {
            Err(diag) => diag.render(),
            Ok(script) => match doge_compiler::check(&file, &source, &script) {
                Err(diag) => diag.render(),
                Ok(()) => panic!("{file} should have failed, but parsed and checked clean"),
            },
        };

        assert!(
            rendered.contains(expected),
            "{file}: expected diagnostic to contain {expected:?}, got:\n{rendered}"
        );
    }
    assert!(
        seen >= 10,
        "expected at least the 10 known fixtures, found {seen} in {}",
        dir.display()
    );
}