lib.rs

//! `spongemock` provides a convenient way to MoCk ThInGs in the style of
//! [Mocking SpongeBob](https://knowyourmeme.com/memes/mocking-spongebob).

/// Returns a MoCkInG version of the given input
///
/// # Example
///
/// ```
/// let mocked = spongemock::mock(&"a sensible EXAMPLE.");
///
/// assert_eq!("A sEnSiBlE eXaMpLe.", mocked);
/// ```
pub fn mock(input: &str) -> String {
    let mut out = String::with_capacity(input.len());
    let mut make_uppercase = true;

    for c in input.chars() {
        if make_uppercase && c.is_lowercase() {
            for upper in c.to_uppercase() {
                out.push(upper);
            }
        } else if !make_uppercase && c.is_uppercase() {
            for upper in c.to_lowercase() {
                out.push(upper);
            }
        } else {
            out.push(c);
        }

        if c.is_alphabetic() {
            make_uppercase = !make_uppercase;
        }
    }

    out
}

#[cfg(test)]
mod test {
    use super::mock;

    #[test]
    fn basic_mocking() {
        assert_eq!(
            mock(&"abcdefghijklmnopqrstuvwxyz"),
            "AbCdEfGhIjKlMnOpQrStUvWxYz".to_string()
        );
        assert_eq!(
            mock(&"ABCDEFGHIJKLMNOPQRSTUVWXYZ"),
            "AbCdEfGhIjKlMnOpQrStUvWxYz".to_string()
        );
        assert_eq!(mock(&"a1b2c3 d4e5f6"), "A1b2C3 d4E5f6".to_string());
        assert_eq!(
            mock(&"1234567890!@#$%^&*()-=_+"),
            "1234567890!@#$%^&*()-=_+".to_string()
        );
        assert_eq!(mock(&"äöüßßâç"), "ÄöÜßSSâÇ".to_string());
        assert_eq!(mock(&"✌🤞😎"), "✌🤞😎".to_string());
    }
}