fn convert_integer()

in uniffi_udl/src/literal.rs [16:57]
32 lines of code
6 McCabe index (conditional complexity)

    fn convert_integer(literal: &weedle::literal::IntegerLit<'_>, type_: &Type) -> Result<Literal> {
        let (string, radix) = match literal {
            weedle::literal::IntegerLit::Dec(v) => (v.0, Radix::Decimal),
            weedle::literal::IntegerLit::Hex(v) => (v.0, Radix::Hexadecimal),
            weedle::literal::IntegerLit::Oct(v) => (v.0, Radix::Octal),
        };
        // This is the radix of the parsed number, passed to `from_str_radix`.
        let src_radix = radix as u32;
        // This radix tells the backends how to represent the number in the output languages.
        let dest_radix = if string == "0" || string.starts_with('-') {
            // 1. weedle parses "0" as an octal literal, but we most likely want to treat this as a decimal.
            // 2. Explicitly negatively signed hex numbers won't convert via i64 very well if they're not 64 bit.
            //    For ease of implementation, output will use decimal.
            Radix::Decimal
        } else {
            radix
        };

        // Clippy seems to think we should be using `strip_prefix` here, but
        // it seems confused as to what this is actually doing.
        #[allow(clippy::manual_strip)]
        let string = if string.starts_with('-') {
            ("-".to_string() + string[1..].trim_start_matches("0x")).to_lowercase()
        } else {
            string.trim_start_matches("0x").to_lowercase()
        };

        Ok(match type_ {
            Type::Int8 | Type::Int16 | Type::Int32 | Type::Int64 => Literal::Int(
                i64::from_str_radix(&string, src_radix)?,
                dest_radix,
                type_.clone(),
            ),
            Type::UInt8 | Type::UInt16 | Type::UInt32 | Type::UInt64 => Literal::UInt(
                u64::from_str_radix(&string, src_radix)?,
                dest_radix,
                type_.clone(),
            ),

            _ => bail!("Cannot coerce literal {} into a non-integer type", string),
        })
    }