fn visit_map()

in src/fixups/buildscript.rs [223:255]
31 lines of code
3 McCabe index (conditional complexity)

    fn visit_map<M>(self, mut access: M) -> Result<Self::Value, M::Error>
    where
        M: MapAccess<'de>,
    {
        let res = if let Some(key) = access.next_key::<&str>()? {
            let res = match key {
                "unresolved" => BuildscriptFixup::Unresolved(access.next_value()?),
                "rustc_flags" => BuildscriptFixup::RustcFlags(access.next_value()?),
                "gen_srcs" => BuildscriptFixup::GenSrcs(access.next_value()?),
                "cxx_library" => BuildscriptFixup::CxxLibrary(access.next_value()?),
                "prebuilt_cxx_library" => {
                    BuildscriptFixup::PrebuiltCxxLibrary(access.next_value()?)
                }
                other => {
                    // other keys are unit, which map to an empty map
                    let _ = access.next_value::<Empty>()?;
                    self.visit_str(other)?
                }
            };
            Ok(res)
        } else {
            return Err(M::Error::custom("Empty BuildscriptFixup map"));
        };

        if let Some(key) = access.next_key::<&str>()? {
            Err(M::Error::custom(format!(
                "Extra BuildscriptFixup map entry: {}",
                key
            )))
        } else {
            res
        }
    }