Method offset

crates/vm/src/builtins/range.rs:119–128

(&self, value: &BigInt)

impl PyRange {
    #[inline]
    fn offset(&self, value: &BigInt) -> Option<BigInt> {
        let start = self.start.as_bigint();
        let stop = self.stop.as_bigint();
        let step = self.step.as_bigint();
        match step.sign() {
            Sign::Plus if value >= start && value < stop => Some(value - start),
            Sign::Minus if value <= self.start.as_bigint() && value > stop => Some(start - value),
            _ => None,
        }
    }

    #[inline]
    pub fn index_of(&self, value: &BigInt) -> Option<BigInt> {