use std::collections::BTreeMap;
use std::fmt;
use serde::{ser, Serialize, Serializer};
use crate::error::{Error, ErrorKind};
use crate::utils::untrusted_size_hint;
use crate::value::{
value_map_with_capacity, Arc, Packed, Value, ValueMap, ValueRepr, VALUE_HANDLES,
VALUE_HANDLE_MARKER,
};
#[derive(Debug)]
pub struct InvalidValue(String);
impl std::error::Error for InvalidValue {}
impl fmt::Display for InvalidValue {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl serde::ser::Error for InvalidValue {
fn custom<T>(msg: T) -> Self
where
T: fmt::Display,
{
InvalidValue(msg.to_string())
}
}
pub fn transform<T: Serialize>(value: T) -> Value {
match value.serialize(ValueSerializer) {
Ok(rv) => rv,
Err(invalid) => Value::from(Error::new(ErrorKind::BadSerialization, invalid.0)),
}
}
pub struct ValueSerializer;
impl Serializer for ValueSerializer {
type Ok = Value;
type Error = InvalidValue;
type SerializeSeq = SerializeSeq;
type SerializeTuple = SerializeTuple;
type SerializeTupleStruct = SerializeTupleStruct;
type SerializeTupleVariant = SerializeTupleVariant;
type SerializeMap = SerializeMap;
type SerializeStruct = SerializeStruct;
type SerializeStructVariant = SerializeStructVariant;
fn serialize_bool(self, v: bool) -> Result<Value, InvalidValue> {
Ok(ValueRepr::Bool(v).into())
}
fn serialize_i8(self, v: i8) -> Result<Value, InvalidValue> {
Ok(ValueRepr::I64(v as i64).into())
}
fn serialize_i16(self, v: i16) -> Result<Value, InvalidValue> {
Ok(ValueRepr::I64(v as i64).into())
}
fn serialize_i32(self, v: i32) -> Result<Value, InvalidValue> {
Ok(ValueRepr::I64(v as i64).into())
}
fn serialize_i64(self, v: i64) -> Result<Value, InvalidValue> {
Ok(ValueRepr::I64(v).into())
}
fn serialize_i128(self, v: i128) -> Result<Value, InvalidValue> {
Ok(ValueRepr::I128(Packed(v)).into())
}
fn serialize_u8(self, v: u8) -> Result<Value, InvalidValue> {
Ok(ValueRepr::U64(v as u64).into())
}
fn serialize_u16(self, v: u16) -> Result<Value, InvalidValue> {
Ok(ValueRepr::U64(v as u64).into())
}
fn serialize_u32(self, v: u32) -> Result<Value, InvalidValue> {
Ok(ValueRepr::U64(v as u64).into())
}
fn serialize_u64(self, v: u64) -> Result<Value, InvalidValue> {
Ok(ValueRepr::U64(v).into())
}
fn serialize_u128(self, v: u128) -> Result<Value, InvalidValue> {
Ok(ValueRepr::U128(Packed(v)).into())
}
fn serialize_f32(self, v: f32) -> Result<Value, InvalidValue> {
Ok(ValueRepr::F64(v as f64).into())
}
fn serialize_f64(self, v: f64) -> Result<Value, InvalidValue> {
Ok(ValueRepr::F64(v).into())
}
fn serialize_char(self, v: char) -> Result<Value, InvalidValue> {
Ok(Value::from(v))
}
fn serialize_str(self, value: &str) -> Result<Value, InvalidValue> {
Ok(Value::from(value))
}
fn serialize_bytes(self, value: &[u8]) -> Result<Value, InvalidValue> {
Ok(ValueRepr::Bytes(Arc::new(value.to_owned())).into())
}
fn serialize_none(self) -> Result<Value, InvalidValue> {
Ok(ValueRepr::None.into())
}
fn serialize_some<T>(self, value: &T) -> Result<Value, InvalidValue>
where
T: Serialize + ?Sized,
{
Ok(transform(value))
}
fn serialize_unit(self) -> Result<Value, InvalidValue> {
Ok(ValueRepr::None.into())
}
fn serialize_unit_struct(self, _name: &'static str) -> Result<Value, InvalidValue> {
Ok(ValueRepr::None.into())
}
fn serialize_unit_variant(
self,
name: &'static str,
variant_index: u32,
variant: &'static str,
) -> Result<Value, InvalidValue> {
if name == VALUE_HANDLE_MARKER && variant == VALUE_HANDLE_MARKER {
Ok(VALUE_HANDLES.with(|handles| {
let mut handles = handles.borrow_mut();
handles
.remove(&variant_index)
.expect("value handle not in registry")
}))
} else {
Ok(Value::from(variant))
}
}
fn serialize_newtype_struct<T>(
self,
_name: &'static str,
value: &T,
) -> Result<Value, InvalidValue>
where
T: Serialize + ?Sized,
{
Ok(transform(value))
}
fn serialize_newtype_variant<T>(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
value: &T,
) -> Result<Value, InvalidValue>
where
T: Serialize + ?Sized,
{
let mut map = value_map_with_capacity(1);
map.insert(variant.into(), transform(value));
Ok(Value::from_object(map))
}
fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, InvalidValue> {
Ok(SerializeSeq {
elements: Vec::with_capacity(untrusted_size_hint(len.unwrap_or(0))),
})
}
fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, InvalidValue> {
Ok(SerializeTuple {
elements: Vec::with_capacity(untrusted_size_hint(len)),
})
}
fn serialize_tuple_struct(
self,
_name: &'static str,
len: usize,
) -> Result<Self::SerializeTupleStruct, InvalidValue> {
Ok(SerializeTupleStruct {
fields: Vec::with_capacity(untrusted_size_hint(len)),
})
}
fn serialize_tuple_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
len: usize,
) -> Result<Self::SerializeTupleVariant, InvalidValue> {
Ok(SerializeTupleVariant {
name: variant,
fields: Vec::with_capacity(untrusted_size_hint(len)),
})
}
fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, InvalidValue> {
Ok(SerializeMap {
entries: value_map_with_capacity(len.unwrap_or(0)),
key: None,
})
}
fn serialize_struct(
self,
_name: &'static str,
len: usize,
) -> Result<Self::SerializeStruct, InvalidValue> {
Ok(SerializeStruct {
fields: value_map_with_capacity(len),
})
}
fn serialize_struct_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
len: usize,
) -> Result<Self::SerializeStructVariant, InvalidValue> {
Ok(SerializeStructVariant {
variant,
map: value_map_with_capacity(len),
})
}
}
pub struct SerializeSeq {
elements: Vec<Value>,
}
impl ser::SerializeSeq for SerializeSeq {
type Ok = Value;
type Error = InvalidValue;
fn serialize_element<T>(&mut self, value: &T) -> Result<(), InvalidValue>
where
T: Serialize + ?Sized,
{
self.elements.push(transform(value));
Ok(())
}
fn end(self) -> Result<Value, InvalidValue> {
Ok(Value::from_object(self.elements))
}
}
pub struct SerializeTuple {
elements: Vec<Value>,
}
impl ser::SerializeTuple for SerializeTuple {
type Ok = Value;
type Error = InvalidValue;
fn serialize_element<T>(&mut self, value: &T) -> Result<(), InvalidValue>
where
T: Serialize + ?Sized,
{
self.elements.push(transform(value));
Ok(())
}
fn end(self) -> Result<Value, InvalidValue> {
Ok(Value::from_object(self.elements))
}
}
pub struct SerializeTupleStruct {
fields: Vec<Value>,
}
impl ser::SerializeTupleStruct for SerializeTupleStruct {
type Ok = Value;
type Error = InvalidValue;
fn serialize_field<T>(&mut self, value: &T) -> Result<(), InvalidValue>
where
T: Serialize + ?Sized,
{
self.fields.push(transform(value));
Ok(())
}
fn end(self) -> Result<Value, InvalidValue> {
Ok(Value::from_object(self.fields))
}
}
pub struct SerializeTupleVariant {
name: &'static str,
fields: Vec<Value>,
}
impl ser::SerializeTupleVariant for SerializeTupleVariant {
type Ok = Value;
type Error = InvalidValue;
fn serialize_field<T>(&mut self, value: &T) -> Result<(), InvalidValue>
where
T: Serialize + ?Sized,
{
self.fields.push(transform(value));
Ok(())
}
fn end(self) -> Result<Value, InvalidValue> {
let mut map = value_map_with_capacity(1);
map.insert(self.name.into(), Value::from_object(self.fields));
Ok(Value::from_object(map))
}
}
pub struct SerializeMap {
entries: ValueMap,
key: Option<Value>,
}
impl ser::SerializeMap for SerializeMap {
type Ok = Value;
type Error = InvalidValue;
fn serialize_key<T>(&mut self, key: &T) -> Result<(), InvalidValue>
where
T: Serialize + ?Sized,
{
match key.serialize(ValueSerializer) {
Ok(key) => self.key = Some(key),
Err(_) => self.key = None,
}
Ok(())
}
fn serialize_value<T>(&mut self, value: &T) -> Result<(), InvalidValue>
where
T: Serialize + ?Sized,
{
if let Some(key) = self.key.take() {
self.entries.insert(key, transform(value));
}
Ok(())
}
fn end(self) -> Result<Value, InvalidValue> {
Ok(Value::from_object(self.entries))
}
fn serialize_entry<K, V>(&mut self, key: &K, value: &V) -> Result<(), InvalidValue>
where
K: Serialize + ?Sized,
V: Serialize + ?Sized,
{
if let Ok(key) = key.serialize(ValueSerializer) {
self.entries.insert(key, transform(value));
}
Ok(())
}
}
pub struct SerializeStruct {
fields: ValueMap,
}
impl ser::SerializeStruct for SerializeStruct {
type Ok = Value;
type Error = InvalidValue;
fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<(), InvalidValue>
where
T: Serialize + ?Sized,
{
self.fields.insert(key.into(), transform(value));
Ok(())
}
fn end(self) -> Result<Value, InvalidValue> {
Ok(Value::from_object(self.fields))
}
}
pub struct SerializeStructVariant {
variant: &'static str,
map: ValueMap,
}
impl ser::SerializeStructVariant for SerializeStructVariant {
type Ok = Value;
type Error = InvalidValue;
fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<(), InvalidValue>
where
T: Serialize + ?Sized,
{
self.map.insert(key.into(), transform(value));
Ok(())
}
fn end(self) -> Result<Value, InvalidValue> {
let mut rv = BTreeMap::new();
rv.insert(self.variant.to_string(), Value::from_object(self.map));
Ok(rv.into())
}
}