flowstdlib 0.142.0

The standard library of functions and flows for 'flow' programs
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

use serde_json::Value;

use flowcore::{RUN_AGAIN, RunAgain};
use flowcore::errors::*;
use flowmacro::flow_function;

#[flow_function]
fn compare(inputs: &[Value]) -> Result<(Option<Value>, RunAgain)> {
    let left = &inputs[0];
    let right = &inputs[1];
    match (left.as_f64(), right.as_f64()) {
        (Some(lhs), Some(rhs)) => {
            let mut output_map = serde_json::Map::new();
            if (rhs - lhs).abs() < f64::EPSILON {
                output_map.insert("equal".into(), right.clone());
                output_map.insert("right-lte".into(), right.clone());
                output_map.insert("left-gte".into(), left.clone());
                output_map.insert("right-gte".into(), right.clone());
                output_map.insert("left-lte".into(), left.clone());
            } else if rhs < lhs {
                output_map.insert("right-lt".into(), right.clone());
                output_map.insert("left-gt".into(), left.clone());
                output_map.insert("right-lte".into(), right.clone());
                output_map.insert("left-gte".into(), left.clone());
            } else if rhs > lhs {
                output_map.insert("right-gt".into(), right.clone());
                output_map.insert("left-lt".into(), left.clone());
                output_map.insert("right-gte".into(), right.clone());
                output_map.insert("left-lte".into(), left.clone());
            }

            let output = Value::Object(output_map);

            Ok((Some(output), RUN_AGAIN))
        }
        (_, _) => bail!("Could not get input values as f64"),
    }
}

#[cfg(test)]
mod test {
    use serde_json::json;

    use flowcore::RUN_AGAIN;

    use super::compare;

    #[test]
    fn integer_equals() {
        let left = json!(1);
        let right = json!(1);
        let inputs = vec![left, right];

        let (value, run_again) = compare(&inputs).expect("compare() failed");

        assert_eq!(run_again, RUN_AGAIN);
        assert!(value.is_some());
        let value = value.expect("No value was returned");
        let map = value.as_object().expect("Expected a json object");
        assert!(map.contains_key("equal"));
    }

    #[test]
    fn float_equals() {
        let left = json!(1.0);
        let right = json!(1.0);
        let inputs = vec![left, right];

        let (value, run_again) = compare(&inputs).expect("compare() failed");

        assert_eq!(run_again, RUN_AGAIN);
        assert!(value.is_some());
        let value = value.expect("Could not get the value from the output");
        let map = value.as_object().expect("Could not get the json object from the output");
        assert!(map.contains_key("equal"));
    }

    #[test]
    fn integer_less_than() {
        let inputs = vec![json!(1), json!(2)];
        let (value, run_again) = compare(&inputs).expect("compare() failed");

        assert_eq!(run_again, RUN_AGAIN);
        assert!(value.is_some());
        let value = value.expect("Could not get the value from the output");
        let map = value.as_object().expect("Could not get the object from the output");
        assert_eq!(map.get("left-lt"), Some(&json!(1)));
        assert_eq!(map.get("right-gt"), Some(&json!(2)));
    }

    #[test]
    fn float_less_than() {
        let inputs = vec![json!(1.0), json!(2.0)];
        let (value, run_again) = compare(&inputs).expect("compare() failed");

        assert_eq!(run_again, RUN_AGAIN);
        assert!(value.is_some());
        let value = value.expect("Could not get the value from the output");
        let map = value.as_object().expect("Could not get the object from the output");
        assert_eq!(map.get("left-lt"), Some(&json!(1.0)));
        assert_eq!(map.get("right-gt"), Some(&json!(2.0)));
    }

    #[test]
    fn integer_more_than() {
        let inputs = vec![json!(2), json!(1)];
        let (value, run_again) = compare(&inputs).expect("compare() failed");

        assert_eq!(run_again, RUN_AGAIN);
        assert!(value.is_some());
        let value = value.expect("Could not get the value from the output");
        let map = value.as_object().expect("Could not get the object from the output");
        assert_eq!(map.get("left-gt"), Some(&json!(2)));
        assert_eq!(map.get("right-lt"), Some(&json!(1)));
    }

    #[test]
    fn float_more_than() {
        let inputs = vec![json!(2.0), json!(1.0)];
        let (value, run_again) = compare(&inputs).expect("compare() failed");

        assert_eq!(run_again, RUN_AGAIN);
        assert!(value.is_some());
        let value = value.expect("Could not get the value from the output");
        let map = value.as_object().expect("Could not get the object from the output");
        assert_eq!(map.get("left-gt"), Some(&json!(2.0)));
        assert_eq!(map.get("right-lt"), Some(&json!(1.0)));
    }

    #[test]
    fn invalid() {
        let inputs = vec![json!("AAA"), json!(1.0)];
        assert!(compare(&inputs).is_err());
    }
}