titleformat-rs 0.2.0

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

/*
 * $ifgreater(int1,int2,then,else)
 *
 * Compares the integer numbers int1 and int2, if int1 is greater than int2,
 * the then part is evaluated and its value returned. Otherwise the else
 * part is evaluated and its value returned.
 */
pub fn ifgreater(args: Vec<Value>) -> Result<Value, Error> {
    if args.len() != 4 {
        return Err(InvalidNativeFunctionArgs(
            String::from("ifgreater"),
            args.len(),
        ));
    }
    if to_int(&args[0].val) > to_int(&args[1].val) {
        Ok(args[2].clone())
    } else {
        Ok(args[3].clone())
    }
}

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

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

    #[test]
    fn greater() {
        assert_eq!(
            ifgreater(vec![
                value_string("2", false),
                value_string("1", true),
                value_string("true", false),
                value_string("false", false)
            ])
            .unwrap(),
            value_string("true", false)
        );
    }

    #[test]
    fn lesser() {
        assert_eq!(
            ifgreater(vec![
                value_string("1", false),
                value_string("2", true),
                value_string("true", false),
                value_string("false", false)
            ])
            .unwrap(),
            value_string("false", false)
        );
    }

    #[test]
    fn equal() {
        assert_eq!(
            ifgreater(vec![
                value_string("1", false),
                value_string("1", true),
                value_string("true", false),
                value_string("false", false)
            ])
            .unwrap(),
            value_string("false", false)
        );
    }
}