apache_age 0.6.5

use serde::{ser, Serialize};

use super::SerializationError;

struct Serializer {
    // This string starts empty and JSON is appended as values are serialized.
    output: String,
    variable: String,
    fields: Option<Vec<String>>,
}

pub fn to_string<T>(
    value: &T,
    variable: String,
    fields: Option<Vec<String>>,
) -> Result<String, SerializationError>
where
    T: Serialize,
{
    let mut serializer = Serializer {
        output: String::new(),
        variable,
        fields,
    };
    value.serialize(&mut serializer)?;
    Ok(serializer.output)
}

impl<'a> ser::Serializer for &'a mut Serializer {
    type Ok = ();
    type Error = SerializationError;

    type SerializeSeq = Self;

    type SerializeTuple = Self;

    type SerializeTupleStruct = Self;

    type SerializeMap = Self;

    type SerializeTupleVariant = Self;

    type SerializeStruct = Self;

    type SerializeStructVariant = Self;

    fn serialize_bool(self, _v: bool) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_i8(self, _v: i8) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_i16(self, _v: i16) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_i32(self, _v: i32) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_i64(self, _v: i64) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_u8(self, _v: u8) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_u16(self, _v: u16) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_u32(self, _v: u32) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_u64(self, _v: u64) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_f32(self, _v: f32) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_f64(self, _v: f64) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_char(self, _v: char) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_str(self, _v: &str) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_bytes(self, _v: &[u8]) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

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

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

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

    fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_unit_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
    ) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_newtype_struct<T: ?Sized>(
        self,
        _name: &'static str,
        _value: &T,
    ) -> Result<Self::Ok, Self::Error>
    where
        T: Serialize,
    {
        Ok(())
    }

    fn serialize_newtype_variant<T: ?Sized>(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _value: &T,
    ) -> Result<Self::Ok, Self::Error>
    where
        T: Serialize,
    {
        Ok(())
    }

    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
        Ok(self)
    }

    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
        Ok(self)
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleStruct, Self::Error> {
        Ok(self)
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
        Ok(self)
    }

    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
        Ok(self)
    }

    fn serialize_struct(
        self,
        _name: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStruct, Self::Error> {
        Ok(self)
    }

    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStructVariant, Self::Error> {
        Ok(self)
    }
}

impl<'a> ser::SerializeStruct for &'a mut Serializer {
    type Ok = ();

    type Error = SerializationError;

    fn serialize_field<T: ?Sized>(
        &mut self,
        key: &'static str,
        _value: &T,
    ) -> Result<(), Self::Error>
    where
        T: Serialize,
    {
        let should_be_added = match &self.fields {
            Some(fields) => fields.iter().any(|x| x.as_str() == key),
            None => true,
        };
        if should_be_added {
            self.output += &format!("{}: {}.{}, ", key, self.variable, key);
        }
        Ok(())
    }

    fn end(self) -> Result<Self::Ok, Self::Error> {
        for _ in 0..2 {
            self.output.pop();
        }
        Ok(())
    }
}

impl<'a> ser::SerializeStructVariant for &'a mut Serializer {
    type Ok = ();

    type Error = SerializationError;

    fn serialize_field<T: ?Sized>(
        &mut self,
        _key: &'static str,
        _value: &T,
    ) -> Result<(), Self::Error>
    where
        T: Serialize,
    {
        Ok(())
    }

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

impl<'a> ser::SerializeTuple for &'a mut Serializer {
    type Ok = ();

    type Error = SerializationError;

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

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

impl<'a> ser::SerializeTupleStruct for &'a mut Serializer {
    type Ok = ();

    type Error = SerializationError;

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

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

impl<'a> ser::SerializeSeq for &'a mut Serializer {
    type Ok = ();

    type Error = SerializationError;

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

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

impl<'a> ser::SerializeMap for &'a mut Serializer {
    type Ok = ();

    type Error = SerializationError;

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

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

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

impl<'a> ser::SerializeTupleVariant for &'a mut Serializer {
    type Ok = ();

    type Error = SerializationError;

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

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