titleformat-rs 0.2.0

A foobar2000 titleformat parser for rust
Documentation 
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use crate::environment::Value;
use crate::types::Error;
use crate::types::Error::*;

/*
 * $if3(a1,a2,...,aN,else)
 *
 * Evaluates arguments a1 ... aN, until one is found that evaluates to true.
 * If that happens, its value is returned. Otherwise the else part is
 * evaluated and its value returned.
 */
pub fn if3(args: Vec<Value>) -> Result<Value, Error> {
    if args.len() < 2 {
        return Err(InvalidNativeFunctionArgs(String::from("if3"), args.len()));
    };
    for v in &args {
        if v.cond {
            return Ok(v.clone());
        }
    }
    Ok(args[args.len() - 1].clone())
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::environment::value_string;

    #[test]
    fn wrong_n_arguments() {
        assert_eq!(
            if3(vec![value_string("blah", false)]).err().unwrap(),
            InvalidNativeFunctionArgs(String::from("if3"), 1)
        );
    }

    #[test]
    fn if3_2() {
        assert_eq!(
            if3(vec![
                value_string("blah", false),
                value_string("true", true)
            ])
            .unwrap(),
            value_string("true", true)
        );
    }

    #[test]
    fn if3_5() {
        assert_eq!(
            if3(vec![
                value_string("blah", false),
                value_string("blah", false),
                value_string("blah", false),
                value_string("blah", false),
                value_string("true", true)
            ])
            .unwrap(),
            value_string("true", true)
        );
    }

    #[test]
    fn if3_else() {
        assert_eq!(
            if3(vec![
                value_string("blah", false),
                value_string("blah", false),
                value_string("blah", false),
                value_string("blah", false),
                value_string("true", false)
            ])
            .unwrap(),
            value_string("true", false)
        );
    }
}