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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
use crate::error::{Error, Result};
use serde::ser::{Impossible, Serialize, Serializer};
/// All serde_v8 "magic" values are reduced to structs with 1 or 2 u64 fields
/// assuming usize==u64, most types are simply a pointer or pointer+len (e.g: Box<T>)
pub type TransmutedField = u64;
pub type FieldResult = Result<TransmutedField>;
macro_rules! not_reachable {
($($name:ident($ty:ty);)*) => {
$(fn $name(self, _v: $ty) -> FieldResult {
unreachable!();
})*
};
}
/// FieldSerializer is a simple serde::Serializer that only returns u64s
/// it allows the "magic" struct serializers to obtain the transmuted field values
pub struct FieldSerializer {}
impl Serializer for FieldSerializer {
type Ok = TransmutedField;
type Error = Error;
type SerializeSeq = Impossible<TransmutedField, Error>;
type SerializeTuple = Impossible<TransmutedField, Error>;
type SerializeTupleStruct = Impossible<TransmutedField, Error>;
type SerializeTupleVariant = Impossible<TransmutedField, Error>;
type SerializeMap = Impossible<TransmutedField, Error>;
type SerializeStruct = Impossible<TransmutedField, Error>;
type SerializeStructVariant = Impossible<TransmutedField, Error>;
fn serialize_u64(self, transmuted_field: u64) -> FieldResult {
Ok(transmuted_field)
}
not_reachable! {
serialize_i8(i8);
serialize_i16(i16);
serialize_i32(i32);
serialize_i64(i64);
serialize_u8(u8);
serialize_u16(u16);
serialize_u32(u32);
// serialize_u64(TransmutedField); the chosen one
serialize_f32(f32);
serialize_f64(f64);
serialize_bool(bool);
serialize_char(char);
serialize_str(&str);
serialize_bytes(&[u8]);
}
fn serialize_none(self) -> FieldResult {
unreachable!();
}
fn serialize_some<T: ?Sized + Serialize>(self, _value: &T) -> FieldResult {
unreachable!();
}
fn serialize_unit(self) -> FieldResult {
unreachable!();
}
fn serialize_unit_struct(self, _name: &'static str) -> FieldResult {
unreachable!();
}
fn serialize_unit_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
) -> FieldResult {
unreachable!();
}
fn serialize_newtype_struct<T: ?Sized + Serialize>(
self,
_name: &'static str,
_value: &T,
) -> FieldResult {
unreachable!();
}
fn serialize_newtype_variant<T: ?Sized + Serialize>(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_value: &T,
) -> FieldResult {
unreachable!();
}
fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
unreachable!();
}
fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> {
unreachable!();
}
fn serialize_tuple_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleStruct> {
unreachable!();
}
fn serialize_tuple_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleVariant> {
unreachable!();
}
fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
unreachable!();
}
fn serialize_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeStruct> {
unreachable!();
}
fn serialize_struct_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeStructVariant> {
unreachable!();
}
}
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