Method lookup

crates/vm/src/codecs.rs:244–269

(&self, encoding: &str, vm: &VirtualMachine)

    }

    pub fn lookup(&self, encoding: &str, vm: &VirtualMachine) -> PyResult<PyCodec> {
        let encoding = normalize_encoding_name(encoding);
        let search_path = {
            let inner = self.inner.read();
            if let Some(codec) = inner.search_cache.get(encoding.as_ref()) {
                // hit cache
                return Ok(codec.clone());
            }
            inner.search_path.clone()
        };
        let encoding: PyUtf8StrRef = vm.ctx.new_utf8_str(encoding.as_ref());
        for func in search_path {
            let res = func.call((encoding.clone(),), vm)?;
            let res: Option<PyCodec> = res.try_into_value(vm)?;
            if let Some(codec) = res {
                let mut inner = self.inner.write();
                // someone might have raced us to this, so use theirs
                let codec = inner
                    .search_cache
                    .entry(encoding.as_str().to_owned())
                    .or_insert(codec);
                return Ok(codec.clone());
            }
        }
        Err(vm.new_lookup_error(format!("unknown encoding: {encoding}")))
    }

    fn _lookup_text_encoding(
        &self,