nativeshell 0.1.16

use std::{collections::HashMap, convert::TryFrom};

use super::{Value, ValueError};

struct Serializer;

impl serde::Serializer for Serializer {
    type Ok = Value;
    type Error = ValueError;
    type SerializeSeq = SerializeList;
    type SerializeTuple = SerializeList;
    type SerializeTupleStruct = SerializeList;
    type SerializeTupleVariant = SerializeTupleVariant;
    type SerializeMap = SerializeMap;
    type SerializeStruct = SerializeMap;
    type SerializeStructVariant = SerializeStructVariant;

    #[inline]
    fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error> {
        Ok(Value::Bool(v))
    }

    #[inline]
    fn serialize_i8(self, v: i8) -> Result<Self::Ok, Self::Error> {
        self.serialize_i64(i64::from(v))
    }

    #[inline]
    fn serialize_i16(self, v: i16) -> Result<Self::Ok, Self::Error> {
        self.serialize_i64(i64::from(v))
    }

    #[inline]
    fn serialize_i32(self, v: i32) -> Result<Self::Ok, Self::Error> {
        self.serialize_i64(i64::from(v))
    }

    #[inline]
    fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error> {
        Ok(Value::I64(v))
    }

    #[inline]
    fn serialize_u8(self, v: u8) -> Result<Self::Ok, Self::Error> {
        self.serialize_i32(i32::from(v))
    }

    #[inline]
    fn serialize_u16(self, v: u16) -> Result<Self::Ok, Self::Error> {
        self.serialize_i32(i32::from(v))
    }

    #[inline]
    fn serialize_u32(self, v: u32) -> Result<Self::Ok, Self::Error> {
        self.serialize_i64(i64::from(v))
    }

    #[inline]
    fn serialize_u64(self, v: u64) -> Result<Self::Ok, Self::Error> {
        let value = i64::try_from(v).map_err(|_| Self::Error::ConversionError)?;
        self.serialize_i64(value)
    }

    #[inline]
    fn serialize_f32(self, v: f32) -> Result<Self::Ok, Self::Error> {
        self.serialize_f64(f64::from(v))
    }

    #[inline]
    fn serialize_f64(self, v: f64) -> Result<Self::Ok, Self::Error> {
        Ok(Value::F64(v))
    }

    #[inline]
    fn serialize_char(self, v: char) -> Result<Self::Ok, Self::Error> {
        let mut s = String::with_capacity(1);
        s.push(v);
        self.serialize_str(&s)
    }

    #[inline]
    fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
        Ok(Value::String(v.into()))
    }

    #[inline]
    fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok, Self::Error> {
        Ok(Value::U8List(v.to_vec()))
    }

    #[inline]
    fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
        self.serialize_unit()
    }

    #[inline]
    fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
    where
        T: serde::Serialize,
    {
        value.serialize(self)
    }

    #[inline]
    fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
        Ok(Value::Null)
    }

    #[inline]
    fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
        self.serialize_unit()
    }

    #[inline]
    fn serialize_unit_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
    ) -> Result<Self::Ok, Self::Error> {
        self.serialize_str(variant)
    }

    #[inline]
    fn serialize_newtype_struct<T: ?Sized>(
        self,
        _name: &'static str,
        value: &T,
    ) -> Result<Self::Ok, Self::Error>
    where
        T: serde::Serialize,
    {
        value.serialize(self)
    }

    #[inline]
    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: serde::Serialize,
    {
        let mut values = HashMap::new();
        values.insert(Value::from(variant.to_owned()), to_value(value)?);
        Ok(Value::Map(values))
    }

    #[inline]
    fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
        Ok(SerializeList {
            vec: Vec::with_capacity(len.unwrap_or(0)),
        })
    }

    #[inline]
    fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, Self::Error> {
        self.serialize_seq(Some(len))
    }

    #[inline]
    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        len: usize,
    ) -> Result<Self::SerializeTupleStruct, Self::Error> {
        self.serialize_tuple(len)
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
        len: usize,
    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
        Ok(SerializeTupleVariant {
            name: String::from(variant),
            vec: Vec::with_capacity(len),
        })
    }

    #[inline]
    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
        Ok(SerializeMap {
            map: HashMap::new(),
            next_key: None,
        })
    }

    #[inline]
    fn serialize_struct(
        self,
        _name: &'static str,
        len: usize,
    ) -> Result<Self::SerializeStruct, Self::Error> {
        self.serialize_map(Some(len))
    }

    #[inline]
    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStructVariant, Self::Error> {
        Ok(SerializeStructVariant {
            name: String::from(variant),
            map: HashMap::new(),
        })
    }
}

pub struct SerializeList {
    vec: Vec<Value>,
}
pub struct SerializeTupleVariant {
    name: String,
    vec: Vec<Value>,
}

pub struct SerializeMap {
    map: HashMap<Value, Value>,
    next_key: Option<Value>,
}
pub struct SerializeStructVariant {
    name: String,
    map: HashMap<Value, Value>,
}

impl serde::ser::SerializeSeq for SerializeList {
    type Ok = Value;
    type Error = ValueError;

    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
    where
        T: serde::Serialize,
    {
        self.vec.push(to_value(value)?);
        Ok(())
    }

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

impl serde::ser::SerializeTuple for SerializeList {
    type Ok = Value;
    type Error = ValueError;

    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
    where
        T: serde::Serialize,
    {
        serde::ser::SerializeSeq::serialize_element(self, value)
    }

    fn end(self) -> Result<Value, Self::Error> {
        serde::ser::SerializeSeq::end(self)
    }
}

impl serde::ser::SerializeTupleStruct for SerializeList {
    type Ok = Value;
    type Error = ValueError;

    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
    where
        T: serde::Serialize,
    {
        serde::ser::SerializeSeq::serialize_element(self, value)
    }

    fn end(self) -> Result<Value, Self::Error> {
        serde::ser::SerializeSeq::end(self)
    }
}

impl serde::ser::SerializeTupleVariant for SerializeTupleVariant {
    type Ok = Value;
    type Error = ValueError;

    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
    where
        T: serde::Serialize,
    {
        self.vec.push(to_value(value)?);
        Ok(())
    }

    fn end(self) -> Result<Value, Self::Error> {
        let mut object = HashMap::new();

        object.insert(Value::from(self.name), Value::List(self.vec));

        Ok(Value::Map(object))
    }
}

impl serde::ser::SerializeMap for SerializeMap {
    type Ok = Value;
    type Error = ValueError;

    fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Self::Error>
    where
        T: serde::Serialize,
    {
        self.next_key = Some(to_value(key)?);
        Ok(())
    }

    fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
    where
        T: serde::Serialize,
    {
        let key = self.next_key.take();
        let key = key.expect("no value for serialized key");
        self.map.insert(key, to_value(value)?);
        Ok(())
    }

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

impl serde::ser::SerializeStruct for SerializeMap {
    type Ok = Value;
    type Error = ValueError;

    fn serialize_field<T: ?Sized>(
        &mut self,
        key: &'static str,
        value: &T,
    ) -> Result<(), Self::Error>
    where
        T: serde::Serialize,
    {
        serde::ser::SerializeMap::serialize_key(self, key)?;
        serde::ser::SerializeMap::serialize_value(self, value)
    }

    fn end(self) -> Result<Value, Self::Error> {
        serde::ser::SerializeMap::end(self)
    }
}

impl serde::ser::SerializeStructVariant for SerializeStructVariant {
    type Ok = Value;
    type Error = ValueError;

    fn serialize_field<T: ?Sized>(
        &mut self,
        key: &'static str,
        value: &T,
    ) -> Result<(), Self::Error>
    where
        T: serde::Serialize,
    {
        self.map
            .insert(Value::from(String::from(key)), to_value(value)?);
        Ok(())
    }

    fn end(self) -> Result<Value, Self::Error> {
        let mut object = HashMap::new();

        object.insert(Value::from(self.name), Value::Map(self.map));

        Ok(Value::Map(object))
    }
}

pub fn to_value<T>(value: T) -> Result<Value, ValueError>
where
    T: serde::Serialize,
{
    value.serialize(Serializer)
}