stroke/src/validators.rs at 047ef6dcbfbde8f0f6ec587b096ce05c1e77e7d2 · MFEK/stroke · GitHub

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#[derive(Debug)]
enum ValidatorRange {
    All,
    PositiveNotZero,
    Positive,
}

fn arg_validator_f64_impl(v: &str, range: ValidatorRange) -> Result<(), String> {
    match v.parse::<f64>() {
        Ok(i) => {
            let err = || Err(String::from(&format!("Value outside allowed range ({:?})", range)));
            match range {
                ValidatorRange::All => Ok(()),
                ValidatorRange::PositiveNotZero => {
                    if i >= 0.0 {
                        Ok(())
                    } else {
                        err()
                    }
                }
                ValidatorRange::Positive => {
                    if i > 0.0 {
                        Ok(())
                    } else {
                        err()
                    }
                }
            }
        }
        Err(_) => Err(String::from("Value must be a float")),
    }
}

pub fn arg_validator_positive_f64(v: &str) -> Result<(), String> {
    arg_validator_f64_impl(v, ValidatorRange::Positive)
}

pub fn arg_validator_positive_or_zero_f64(v: &str) -> Result<(), String> {
    arg_validator_f64_impl(v, ValidatorRange::PositiveNotZero)
}

pub fn arg_validator_f64(v: &str) -> Result<(), String> {
    arg_validator_f64_impl(v, ValidatorRange::All)
}

pub fn arg_validator_isize(v: &str) -> Result<(), String> {
    match v.parse::<isize>() {
        Ok(_) => Ok(()),
        Err(_) => Err(String::from("Value must be an integer")),
    }
}

pub fn arg_validator_usize(v: &str) -> Result<(), String> {
    match v.parse::<isize>() {
        Ok(_) => Ok(()),
        Err(_) => Err(String::from("Value must be a positive integer")),
    }
}