finx 0.1.0

A fast, lightweight embeddable scripting language
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
136
137
138
139
140
141
142
143
144

#[cfg(test)]
mod tests {
    use finx::Finx;

    // Helper to capture stdout for assertions
    fn run_and_capture(source: &str) -> Vec<String> {
        let mut engine = Finx::new();
        engine.execute(source).expect("Execution failed");
        engine.get_output()
    }

    #[test]
    fn test_simple_while_loop() {
        let src = r#"
            let i = 0;
            while i < 3 {
                print(i);
                i = i + 1;
            }
            print("done");
        "#;
        let out = run_and_capture(src);
        assert_eq!(out, ["0", "1", "2", "done"]);
    }

    #[test]
    fn test_simple_for_loop() {
        let src = r#"
            for i 0..3 {
                print(i);
            }
            print("done");
        "#;
        let out = run_and_capture(src);
        assert_eq!(out, ["0", "1", "2", "done"]);
    }

    #[test]
    fn test_nested_loops() {
        let src = r#"
            for i 0..2 {
                for j 0..2 {
                    print(i * 2 + j);
                }
            }
        "#;
        let out = run_and_capture(src);
        assert_eq!(out, ["0", "1", "2", "3"]);
    }

    #[test]
    fn test_while_loop_with_zero_iterations() {
        let src = r#"
            let i = 5;
            while i < 3 {
                print(i);
                i = i + 1;
            }
            print("after");
        "#;
        let out = run_and_capture(src);
        assert_eq!(out, ["after"]);
    }

    #[test]
    fn test_for_loop_with_zero_iterations() {
        let src = r#"
            for i 5..3 {
                print(i);
            }
            print("after");
        "#;
        let out = run_and_capture(src);
        assert_eq!(out, ["after"]);
    }

    #[test]
    fn test_for_loop_variable_scope() {
        let src = r#"
            let i = 100;
            for i 0..2 {
                print(i);
            }
            print(i); // Should print 100, not the loop variable
        "#;
        let out = run_and_capture(src);
        assert_eq!(out, ["0", "1", "100"]);
    }

    #[test]
    fn test_while_loop_with_complex_condition() {
        let src = r#"
            let x = 1;
            let y = 10;
            while x * 2 < y {
                print(x);
                x = x * 2;
            }
        "#;
        let out = run_and_capture(src);
        assert_eq!(out, ["1", "2", "4"]);
    }

    #[test]
    fn test_for_loop_with_expressions() {
        let src = r#"
            for i (1 + 1)..(3 + 2) {
                print(i);
            }
        "#;
        let out = run_and_capture(src);
        assert_eq!(out, ["2", "3", "4"]);
    }

    #[test]
    fn test_loop_with_function_calls() {
        let src = r#"
            fn double(x) {
                return x * 2;
            }
            
            for i 0..3 {
                print(double(i));
            }
        "#;
        let out = run_and_capture(src);
        assert_eq!(out, ["0", "2", "4"]);
    }

    #[test]
    fn test_while_loop_modifying_external_variable() {
        let src = r#"
            let sum = 0;
            let i = 1;
            while i <= 3 {
                sum = sum + i;
                i = i + 1;
            }
            print(sum);
        "#;
        let out = run_and_capture(src);
        assert_eq!(out, ["6"]); // 1 + 2 + 3 = 6
    }
}