windjammer 0.48.0

A simple language inspired by Go, Ruby, and Elixir that transpiles to Rust - 80% of Rust's power with 20% of the complexity
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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

#![cfg(any(
    not(any(
        feature = "parser_tests",
        feature = "analyzer_tests",
        feature = "codegen_tests",
        feature = "interpreter_tests",
        feature = "conformance_tests",
        feature = "integration_tests",
    )),
    feature = "analyzer_tests",
))]

// TDD: Test ownership inference for method parameters that mutate their arguments

#[path = "common/test_utils.rs"]
mod test_utils;

#[test]
fn test_method_param_inferred_as_mut_ref_when_field_mutated() {
    let source = r#"
struct Grid {
    data: i32,
}

impl Grid {
    pub fn set(self, value: i32) {
        self.data = value
    }
}

fn modify_grid(self, grid: Grid) {
    grid.set(42)  // Should infer `&mut grid` parameter
}
    "#;

    let rust_code = test_utils::compile_single_result(source).expect("Compilation should succeed");

    // Should generate `&mut grid` parameter
    assert!(
        rust_code.contains("grid: &mut Grid"),
        "Should infer &mut for parameter when method mutates it. Got:\n{}",
        rust_code
    );
}

#[test]
fn test_string_param_comparison_no_deref() {
    let source = r#"
pub fn check_topic(topic: string) -> bool {
    if topic == "test" {
        return true
    }
    false
}
    "#;

    let rust_code = test_utils::compile_single_result(source).expect("Compilation should succeed");

    // `*topic == "..."` is valid Rust for `&str` (deref to str for comparison)
    let cmp_ok = rust_code.contains("topic ==") || rust_code.contains("*topic ==");
    assert!(
        cmp_ok,
        "Should generate a string comparison. Got:\n{}",
        rust_code
    );
}

#[test]
fn test_string_param_comparison_in_method_no_deref() {
    let source = r#"
struct Companion {
    name: string,
}

impl Companion {
    pub fn get_dialogue_response(self, topic: string) -> string {
        if topic == "pragmatic" {
            return "Test response".to_string()
        }
        "Default response".to_string()
    }
}
    "#;

    let rust_code = test_utils::compile_single_result(source).expect("Compilation should succeed");

    let cmp_ok = rust_code.contains("topic ==") || rust_code.contains("*topic ==");
    assert!(
        cmp_ok,
        "Should generate a string comparison in method. Got:\n{}",
        rust_code
    );
}

#[test]
fn test_param_inferred_as_mut_ref_when_method_called() {
    let source = r#"
struct VoxelGrid {
    data: Vec<i32>,
}

impl VoxelGrid {
    pub fn set(self, x: i32, y: i32, z: i32, value: i32) {
        self.data.push(value)
    }
}

struct Environment {
    name: string,
}

impl Environment {
    fn generate_ground(self, grid: VoxelGrid) {
        grid.set(0, 0, 0, 1)  // Should infer `&mut grid` parameter
    }
    
    fn generate_buildings(self, grid: VoxelGrid) {
        let mut i = 0
        while i < 5 {
            grid.set(i, 0, 0, 2)  // Should infer `&mut grid` parameter
            i = i + 1
        }
    }
}
    "#;

    let rust_code = test_utils::compile_single_result(source).expect("Compilation should succeed");

    // Should infer &mut for grid parameters (used in mutating method calls)
    assert!(
        rust_code.contains("grid: &mut VoxelGrid"),
        "Should infer &mut VoxelGrid for parameter when method mutates it. Got:\n{}",
        rust_code
    );
}