serde_evaluate 0.2.2

Extract single scalar field values from Serializable structs without full deserialization.
Documentation 
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//! Skip struct for efficiently skipping non-target content during serialization.

use crate::error::EvaluateError;
use serde::ser;
use serde::Serialize;

/// Dummy struct to handle skipping compound types during serialization.
pub(crate) struct Skip;

impl ser::SerializeTuple for Skip {
    type Ok = ();
    type Error = EvaluateError;

    fn serialize_element<T>(&mut self, _value: &T) -> Result<(), Self::Error>
    where
        T: ?Sized + Serialize,
    {
        Ok(())
    }

    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}

impl ser::SerializeTupleStruct for Skip {
    type Ok = ();
    type Error = EvaluateError;

    fn serialize_field<T>(&mut self, _value: &T) -> Result<(), Self::Error>
    where
        T: ?Sized + Serialize,
    {
        Ok(())
    }

    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}

impl ser::SerializeMap for Skip {
    type Ok = ();
    type Error = EvaluateError;

    fn serialize_key<T>(&mut self, _key: &T) -> Result<(), Self::Error>
    where
        T: ?Sized + Serialize,
    {
        Ok(())
    }

    fn serialize_value<T>(&mut self, _value: &T) -> Result<(), Self::Error>
    where
        T: ?Sized + Serialize,
    {
        Ok(())
    }

    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}

impl ser::SerializeSeq for Skip {
    type Ok = ();
    type Error = EvaluateError;

    fn serialize_element<T>(&mut self, _value: &T) -> Result<(), Self::Error>
    where
        T: ?Sized + Serialize,
    {
        Ok(())
    }

    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}