buup/transformers/
rot13.rs

1use crate::{Transform, TransformError, TransformerCategory};
2
3/// Rot13 transformer
4#[derive(Debug, Clone, Copy, PartialEq, Eq)]
5pub struct Rot13;
6
7impl Transform for Rot13 {
8    fn name(&self) -> &'static str {
9        "Rot13"
10    }
11
12    fn id(&self) -> &'static str {
13        "rot13"
14    }
15
16    fn description(&self) -> &'static str {
17        "Applies the ROT13 substitution cipher to the input text."
18    }
19
20    fn category(&self) -> TransformerCategory {
21        TransformerCategory::Encoder // Or Other, depends on classification
22    }
23
24    fn transform(&self, input: &str) -> Result<String, TransformError> {
25        Ok(input
26            .chars()
27            .map(|c| {
28                if c.is_ascii_alphabetic() {
29                    let base = if c.is_ascii_lowercase() { b'a' } else { b'A' };
30                    (((c as u8 - base + 13) % 26) + base) as char
31                } else {
32                    c
33                }
34            })
35            .collect())
36    }
37
38    fn default_test_input(&self) -> &'static str {
39        "The quick brown fox jumps over the lazy dog"
40    }
41}
42
43#[cfg(test)]
44mod tests {
45    use super::*;
46
47    #[test]
48    fn test_rot13_transformation() {
49        let transformer = Rot13;
50        let input = transformer.default_test_input();
51        let expected_output = "Gur dhvpx oebja sbk whzcf bire gur ynml qbt";
52        assert_eq!(transformer.transform(input).unwrap(), expected_output);
53
54        // Test that applying Rot13 twice returns the original string
55        let double_transformed = transformer.transform(expected_output).unwrap();
56        assert_eq!(double_transformed, input);
57
58        // Test with numbers and symbols
59        let mixed_input = "Hello 123! - World?";
60        let expected_mixed_output = "Uryyb 123! - Jbeyq?";
61        assert_eq!(
62            transformer.transform(mixed_input).unwrap(),
63            expected_mixed_output
64        );
65    }
66
67    #[test]
68    fn test_rot13_metadata() {
69        let transformer = Rot13;
70        assert_eq!(transformer.name(), "Rot13");
71        assert_eq!(transformer.id(), "rot13");
72        assert_eq!(transformer.category(), TransformerCategory::Encoder);
73    }
74}
buup/transformers/rot13.rs

buup/transformers/
rot13.rs
