Function scanstring

crates/stdlib/src/json.rs:697–727

(
        s: PyStrRef,
        end: usize,
        strict: OptionalArg<bool>,
        vm: &VirtualMachine,
    )

    #[pyfunction]
    fn scanstring(
        s: PyStrRef,
        end: usize,
        strict: OptionalArg<bool>,
        vm: &VirtualMachine,
    ) -> PyResult<(Wtf8Buf, usize)> {
        flame_guard!("_json::scanstring");
        let wtf8 = s.as_wtf8();

        // Convert char index `end` to byte index
        let byte_idx = if end == 0 {
            0
        } else {
            wtf8.code_point_indices()
                .nth(end)
                .map(|(i, _)| i)
                .ok_or_else(|| {
                    py_decode_error(
                        machinery::DecodeError::new("Unterminated string starting at", end - 1),
                        s.clone(),
                        vm,
                    )
                })?
        };

        let (result, chars_consumed, _bytes_consumed) =
            machinery::scanstring(&wtf8[byte_idx..], end, strict.unwrap_or(true))
                .map_err(|e| py_decode_error(e, s, vm))?;

        Ok((result, end + chars_consumed))
    }
}