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//! Buffer for serializing data.
//!
//! This is a copy and improvement of the `serde` private type:
//! The code is very stable in the `serde` crate, so no maintainability problem is expected.
//!
//! Since the type is private we copy the type here.
//! `serde` is licensed as MIT+Apache2, the same as this crate.
//!
//! This version carries improvements compared to `serde`'s version.
//! The types support 128-bit integers, which is supported for all targets in Rust 1.40+.
//! The [`ContentSerializer`] can also be configured to human readable or compact representation.
use crate::prelude::*;
pub(crate) enum Content {
Bool(bool),
U8(u8),
U16(u16),
U32(u32),
U64(u64),
U128(u128),
I8(i8),
I16(i16),
I32(i32),
I64(i64),
I128(i128),
F32(f32),
F64(f64),
Char(char),
String(String),
Bytes(Vec<u8>),
None,
Some(Box<Content>),
Unit,
UnitStruct(&'static str),
UnitVariant(&'static str, u32, &'static str),
NewtypeStruct(&'static str, Box<Content>),
NewtypeVariant(&'static str, u32, &'static str, Box<Content>),
Seq(Vec<Content>),
Tuple(Vec<Content>),
TupleStruct(&'static str, Vec<Content>),
TupleVariant(&'static str, u32, &'static str, Vec<Content>),
Map(Vec<(Content, Content)>),
Struct(&'static str, Vec<(&'static str, Content)>),
StructVariant(
&'static str,
u32,
&'static str,
Vec<(&'static str, Content)>,
),
}
impl Content {
pub(crate) fn as_str(&self) -> Option<&str> {
match self {
Self::String(ref x) => Some(x),
Self::Bytes(x) => core::str::from_utf8(x).ok(),
_ => None,
}
}
}
impl Serialize for Content {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
match *self {
Content::Bool(b) => serializer.serialize_bool(b),
Content::U8(u) => serializer.serialize_u8(u),
Content::U16(u) => serializer.serialize_u16(u),
Content::U32(u) => serializer.serialize_u32(u),
Content::U64(u) => serializer.serialize_u64(u),
Content::U128(u) => serializer.serialize_u128(u),
Content::I8(i) => serializer.serialize_i8(i),
Content::I16(i) => serializer.serialize_i16(i),
Content::I32(i) => serializer.serialize_i32(i),
Content::I64(i) => serializer.serialize_i64(i),
Content::I128(i) => serializer.serialize_i128(i),
Content::F32(f) => serializer.serialize_f32(f),
Content::F64(f) => serializer.serialize_f64(f),
Content::Char(c) => serializer.serialize_char(c),
Content::String(ref s) => serializer.serialize_str(s),
Content::Bytes(ref b) => serializer.serialize_bytes(b),
Content::None => serializer.serialize_none(),
Content::Some(ref c) => serializer.serialize_some(&**c),
Content::Unit => serializer.serialize_unit(),
Content::UnitStruct(n) => serializer.serialize_unit_struct(n),
Content::UnitVariant(n, i, v) => serializer.serialize_unit_variant(n, i, v),
Content::NewtypeStruct(n, ref c) => serializer.serialize_newtype_struct(n, &**c),
Content::NewtypeVariant(n, i, v, ref c) => {
serializer.serialize_newtype_variant(n, i, v, &**c)
}
Content::Seq(ref elements) => elements.serialize(serializer),
Content::Tuple(ref elements) => {
let mut tuple = serializer.serialize_tuple(elements.len())?;
for e in elements {
tuple.serialize_element(e)?;
}
tuple.end()
}
Content::TupleStruct(n, ref fields) => {
let mut ts = serializer.serialize_tuple_struct(n, fields.len())?;
for f in fields {
ts.serialize_field(f)?;
}
ts.end()
}
Content::TupleVariant(n, i, v, ref fields) => {
let mut tv = serializer.serialize_tuple_variant(n, i, v, fields.len())?;
for f in fields {
tv.serialize_field(f)?;
}
tv.end()
}
Content::Map(ref entries) => {
let mut map = serializer.serialize_map(Some(entries.len()))?;
for (k, v) in entries {
map.serialize_entry(k, v)?;
}
map.end()
}
Content::Struct(n, ref fields) => {
let mut s = serializer.serialize_struct(n, fields.len())?;
for (k, v) in fields {
s.serialize_field(k, v)?;
}
s.end()
}
Content::StructVariant(n, i, v, ref fields) => {
let mut sv = serializer.serialize_struct_variant(n, i, v, fields.len())?;
for (k, v) in fields {
sv.serialize_field(k, v)?;
}
sv.end()
}
}
}
}
pub(crate) struct ContentSerializer<E> {
is_human_readable: bool,
error: PhantomData<E>,
}
impl<E> ContentSerializer<E> {
pub(crate) fn new(is_human_readable: bool) -> Self {
ContentSerializer {
is_human_readable,
error: PhantomData,
}
}
}
impl<E> Default for ContentSerializer<E> {
fn default() -> Self {
Self::new(true)
}
}
impl<E> Serializer for ContentSerializer<E>
where
E: SerError,
{
type Ok = Content;
type Error = E;
type SerializeSeq = SeqSerialize<E>;
type SerializeTuple = TupleSerialize<E>;
type SerializeTupleStruct = TupleStructSerialize<E>;
type SerializeTupleVariant = TupleVariantSerialize<E>;
type SerializeMap = MapSerialize<E>;
type SerializeStruct = StructSerialize<E>;
type SerializeStructVariant = StructVariantSerialize<E>;
fn is_human_readable(&self) -> bool {
self.is_human_readable
}
fn serialize_bool(self, v: bool) -> Result<Content, E> {
Ok(Content::Bool(v))
}
fn serialize_i8(self, v: i8) -> Result<Content, E> {
Ok(Content::I8(v))
}
fn serialize_i16(self, v: i16) -> Result<Content, E> {
Ok(Content::I16(v))
}
fn serialize_i32(self, v: i32) -> Result<Content, E> {
Ok(Content::I32(v))
}
fn serialize_i64(self, v: i64) -> Result<Content, E> {
Ok(Content::I64(v))
}
fn serialize_i128(self, v: i128) -> Result<Content, E> {
Ok(Content::I128(v))
}
fn serialize_u8(self, v: u8) -> Result<Content, E> {
Ok(Content::U8(v))
}
fn serialize_u16(self, v: u16) -> Result<Content, E> {
Ok(Content::U16(v))
}
fn serialize_u32(self, v: u32) -> Result<Content, E> {
Ok(Content::U32(v))
}
fn serialize_u64(self, v: u64) -> Result<Content, E> {
Ok(Content::U64(v))
}
fn serialize_u128(self, v: u128) -> Result<Content, E> {
Ok(Content::U128(v))
}
fn serialize_f32(self, v: f32) -> Result<Content, E> {
Ok(Content::F32(v))
}
fn serialize_f64(self, v: f64) -> Result<Content, E> {
Ok(Content::F64(v))
}
fn serialize_char(self, v: char) -> Result<Content, E> {
Ok(Content::Char(v))
}
fn serialize_str(self, value: &str) -> Result<Content, E> {
Ok(Content::String(value.to_owned()))
}
fn serialize_bytes(self, value: &[u8]) -> Result<Content, E> {
Ok(Content::Bytes(value.to_owned()))
}
fn serialize_none(self) -> Result<Content, E> {
Ok(Content::None)
}
fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Content, E>
where
T: Serialize,
{
Ok(Content::Some(Box::new(value.serialize(self)?)))
}
fn serialize_unit(self) -> Result<Content, E> {
Ok(Content::Unit)
}
fn serialize_unit_struct(self, name: &'static str) -> Result<Content, E> {
Ok(Content::UnitStruct(name))
}
fn serialize_unit_variant(
self,
name: &'static str,
variant_index: u32,
variant: &'static str,
) -> Result<Content, E> {
Ok(Content::UnitVariant(name, variant_index, variant))
}
fn serialize_newtype_struct<T: ?Sized>(
self,
name: &'static str,
value: &T,
) -> Result<Content, E>
where
T: Serialize,
{
Ok(Content::NewtypeStruct(
name,
Box::new(value.serialize(self)?),
))
}
fn serialize_newtype_variant<T: ?Sized>(
self,
name: &'static str,
variant_index: u32,
variant: &'static str,
value: &T,
) -> Result<Content, E>
where
T: Serialize,
{
Ok(Content::NewtypeVariant(
name,
variant_index,
variant,
Box::new(value.serialize(self)?),
))
}
fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, E> {
Ok(SeqSerialize {
is_human_readable: self.is_human_readable,
elements: Vec::with_capacity(len.unwrap_or(0)),
error: PhantomData,
})
}
fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, E> {
Ok(TupleSerialize {
is_human_readable: self.is_human_readable,
elements: Vec::with_capacity(len),
error: PhantomData,
})
}
fn serialize_tuple_struct(
self,
name: &'static str,
len: usize,
) -> Result<Self::SerializeTupleStruct, E> {
Ok(TupleStructSerialize {
is_human_readable: self.is_human_readable,
name,
fields: Vec::with_capacity(len),
error: PhantomData,
})
}
fn serialize_tuple_variant(
self,
name: &'static str,
variant_index: u32,
variant: &'static str,
len: usize,
) -> Result<Self::SerializeTupleVariant, E> {
Ok(TupleVariantSerialize {
is_human_readable: self.is_human_readable,
name,
variant_index,
variant,
fields: Vec::with_capacity(len),
error: PhantomData,
})
}
fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, E> {
Ok(MapSerialize {
is_human_readable: self.is_human_readable,
entries: Vec::with_capacity(len.unwrap_or(0)),
key: None,
error: PhantomData,
})
}
fn serialize_struct(self, name: &'static str, len: usize) -> Result<Self::SerializeStruct, E> {
Ok(StructSerialize {
is_human_readable: self.is_human_readable,
name,
fields: Vec::with_capacity(len),
error: PhantomData,
})
}
fn serialize_struct_variant(
self,
name: &'static str,
variant_index: u32,
variant: &'static str,
len: usize,
) -> Result<Self::SerializeStructVariant, E> {
Ok(StructVariantSerialize {
is_human_readable: self.is_human_readable,
name,
variant_index,
variant,
fields: Vec::with_capacity(len),
error: PhantomData,
})
}
}
pub(crate) struct SeqSerialize<E> {
is_human_readable: bool,
elements: Vec<Content>,
error: PhantomData<E>,
}
impl<E> SerializeSeq for SeqSerialize<E>
where
E: SerError,
{
type Ok = Content;
type Error = E;
fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), E>
where
T: Serialize,
{
let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
self.elements.push(value);
Ok(())
}
fn end(self) -> Result<Content, E> {
Ok(Content::Seq(self.elements))
}
}
pub(crate) struct TupleSerialize<E> {
is_human_readable: bool,
elements: Vec<Content>,
error: PhantomData<E>,
}
impl<E> SerializeTuple for TupleSerialize<E>
where
E: SerError,
{
type Ok = Content;
type Error = E;
fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), E>
where
T: Serialize,
{
let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
self.elements.push(value);
Ok(())
}
fn end(self) -> Result<Content, E> {
Ok(Content::Tuple(self.elements))
}
}
pub(crate) struct TupleStructSerialize<E> {
is_human_readable: bool,
name: &'static str,
fields: Vec<Content>,
error: PhantomData<E>,
}
impl<E> SerializeTupleStruct for TupleStructSerialize<E>
where
E: SerError,
{
type Ok = Content;
type Error = E;
fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), E>
where
T: Serialize,
{
let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
self.fields.push(value);
Ok(())
}
fn end(self) -> Result<Content, E> {
Ok(Content::TupleStruct(self.name, self.fields))
}
}
pub(crate) struct TupleVariantSerialize<E> {
is_human_readable: bool,
name: &'static str,
variant_index: u32,
variant: &'static str,
fields: Vec<Content>,
error: PhantomData<E>,
}
impl<E> SerializeTupleVariant for TupleVariantSerialize<E>
where
E: SerError,
{
type Ok = Content;
type Error = E;
fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), E>
where
T: Serialize,
{
let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
self.fields.push(value);
Ok(())
}
fn end(self) -> Result<Content, E> {
Ok(Content::TupleVariant(
self.name,
self.variant_index,
self.variant,
self.fields,
))
}
}
pub(crate) struct MapSerialize<E> {
is_human_readable: bool,
entries: Vec<(Content, Content)>,
key: Option<Content>,
error: PhantomData<E>,
}
impl<E> SerializeMap for MapSerialize<E>
where
E: SerError,
{
type Ok = Content;
type Error = E;
fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), E>
where
T: Serialize,
{
let key = key.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
self.key = Some(key);
Ok(())
}
fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), E>
where
T: Serialize,
{
let key = self
.key
.take()
.expect("serialize_value called before serialize_key");
let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
self.entries.push((key, value));
Ok(())
}
fn end(self) -> Result<Content, E> {
Ok(Content::Map(self.entries))
}
fn serialize_entry<K: ?Sized, V: ?Sized>(&mut self, key: &K, value: &V) -> Result<(), E>
where
K: Serialize,
V: Serialize,
{
let key = key.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
self.entries.push((key, value));
Ok(())
}
}
pub(crate) struct StructSerialize<E> {
is_human_readable: bool,
name: &'static str,
fields: Vec<(&'static str, Content)>,
error: PhantomData<E>,
}
impl<E> SerializeStruct for StructSerialize<E>
where
E: SerError,
{
type Ok = Content;
type Error = E;
fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), E>
where
T: Serialize,
{
let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
self.fields.push((key, value));
Ok(())
}
fn end(self) -> Result<Content, E> {
Ok(Content::Struct(self.name, self.fields))
}
}
pub(crate) struct StructVariantSerialize<E> {
is_human_readable: bool,
name: &'static str,
variant_index: u32,
variant: &'static str,
fields: Vec<(&'static str, Content)>,
error: PhantomData<E>,
}
impl<E> SerializeStructVariant for StructVariantSerialize<E>
where
E: SerError,
{
type Ok = Content;
type Error = E;
fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), E>
where
T: Serialize,
{
let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
self.fields.push((key, value));
Ok(())
}
fn end(self) -> Result<Content, E> {
Ok(Content::StructVariant(
self.name,
self.variant_index,
self.variant,
self.fields,
))
}
}