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

use serde_json::{json, Value};

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

#[flow_function]
fn _append(inputs: &[Value]) -> Result<(Option<Value>, RunAgain)> {
    let v1 = inputs[0].clone();
    let v2 = inputs[1].clone();

    let s1 = v1.as_str().ok_or("Could not get s1")?;
    let s2 = v2.as_str().ok_or("Could not get s2")?;
    Ok((Some(json!(format!("{s1}{s2}"))), RUN_AGAIN))
}

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

    use super::_append;

    #[test]
    fn append_one_empty_string() {
        let s1 = json!("");
        let s2 = json!("hello");

        let (result, _) = _append(&[s1, s2]).expect("_append() failed");
        let output = result.expect("Could not get the Value from the output");
        assert_eq!(output, json!("hello"));
    }

    #[test]
    fn append_two_empty_strings() {
        let s1 = json!("");
        let s2 = json!("");

        let (result, _) = _append(&[s1, s2]).expect("_append() failed");
        let output = result.expect("Could not get the Value from the output");
        assert_eq!(output, json!(""));
    }

    #[test]
    fn append_two_strings() {
        let s1 = json!("hello");
        let s2 = json!(" world");

        let (result, _) = _append(&[s1, s2]).expect("_append() failed");
        let output = result.expect("Could not get the Value from the output");
        assert_eq!(output, json!("hello world"));
    }

    #[test]
    fn append_one_non_string() {
        let s1 = json!("hello");
        let s2 = json!(42);

        assert!(_append(&[s1, s2]).is_err());
    }
}