git_helpe_rs/
template.rs

1use anyhow::{Error, Result};
2
3pub fn validate_interpolation_places_count(format: &String, params_len: usize) -> Result<()> {
4    validate_interpolation_places_on_custom_pattern(format, params_len, "{}")
5}
6
7pub fn validate_interpolation_places_on_custom_pattern(
8    format: &String,
9    params_len: usize,
10    custom_pattern: &str,
11) -> Result<()> {
12    let splitted = format.split(custom_pattern).into_iter();
13    let places_to_interpolate = Vec::from_iter(splitted).len();
14
15    if places_to_interpolate - 1 == params_len {
16        Ok(())
17    } else {
18        Err(Error::msg(format!(
19            "
20       \n Number of places to interpolate doesn't match with number of args provided.
21       Expected {} 
22       Received {}
23        ",
24            places_to_interpolate - 1,
25            params_len
26        )))
27    }
28}
29
30pub fn interpolate(format: &String, values: Vec<String>) -> Result<String> {
31    interpolate_on_custom_val(format, values, "{}")
32}
33
34pub fn interpolate_on_custom_val(
35    format: &String,
36    values: Vec<String>,
37    interpolate_on: &str,
38) -> Result<String> {
39    let splitted = format.split(interpolate_on);
40    let appended: Vec<String> = splitted
41        .into_iter()
42        .enumerate()
43        .map(|(i, x)| {
44            if i >= values.len() {
45                return x.to_owned();
46            }
47            return x.to_owned() + &values[i];
48        })
49        .collect();
50
51    Ok(appended.join(""))
52}
53
54#[cfg(test)]
55mod tests {
56    use super::*;
57
58    #[test]
59    fn test_interpolate_no_placeholders() {
60        let format = String::from("Hello, world!");
61        let values = vec![];
62        let result = interpolate(&format, values);
63        assert!(result.is_ok());
64        assert_eq!(result.unwrap(), "Hello, world!");
65    }
66
67    #[test]
68    fn test_interpolate_single_placeholder() {
69        let format = String::from("Hello, {}!");
70        let values = vec![String::from("world")];
71        let result = interpolate(&format, values);
72        assert!(result.is_ok());
73        assert_eq!(result.unwrap(), "Hello, world!");
74    }
75
76    #[test]
77    fn test_interpolate_multiple_placeholders() {
78        let format = String::from("Hello, {}, you are {} years old.");
79        let values = vec![String::from("John"), String::from("30")];
80        let result = interpolate(&format, values);
81        assert!(result.is_ok());
82        assert_eq!(result.unwrap(), "Hello, John, you are 30 years old.");
83    }
84
85    #[test]
86    fn test_interpolate_not_enough_values() {
87        let format = String::from("Hello, {}!");
88        let values: Vec<String> = vec![];
89        let result = validate_interpolation_places_count(&format, values.len());
90        assert!(result.is_err());
91    }
92
93    #[test]
94    fn test_interpolate_too_many_values() {
95        let format = String::from("Hello, {}!");
96        let values = vec![String::from("world"), String::from("extra")];
97        let result = validate_interpolation_places_count(&format, values.len());
98        assert!(result.is_err());
99    }
100}
git_helpe_rs/template.rs

git_helpe_rs/
template.rs
