use core::fmt;
use serde::Serialize;
use crate::core::types;
use crate::core::enc::{ self, Encode };
use crate::serde::error::EncodeError;
pub struct Serializer<W> {
writer: W
}
impl<W> Serializer<W> {
pub fn new(writer: W) -> Serializer<W> {
Serializer { writer }
}
pub fn into_inner(self) -> W {
self.writer
}
}
impl<'a, W: enc::Write> serde::Serializer for &'a mut Serializer<W> {
type Ok = ();
type Error = EncodeError<W::Error>;
type SerializeSeq = Collect<'a, W>;
type SerializeTuple = BoundedCollect<'a, W>;
type SerializeTupleStruct = BoundedCollect<'a, W>;
type SerializeTupleVariant = BoundedCollect<'a, W>;
type SerializeMap = Collect<'a, W>;
type SerializeStruct = BoundedCollect<'a, W>;
type SerializeStructVariant = BoundedCollect<'a, W>;
#[inline]
fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_i8(self, v: i8) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_i16(self, v: i16) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_i32(self, v: i32) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_u8(self, v: u8) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_u16(self, v: u16) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_u32(self, v: u32) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_u64(self, v: u64) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_f32(self, v: f32) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_f64(self, v: f64) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_char(self, v: char) -> Result<Self::Ok, Self::Error> {
let mut buf = [0; 4];
self.serialize_str(v.encode_utf8(&mut buf))
}
#[inline]
fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok, Self::Error> {
types::Bytes(v).encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
types::Null.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_some<T: Serialize + ?Sized>(self, value: &T)
-> Result<Self::Ok, Self::Error>
{
value.serialize(self)
}
#[inline]
fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
types::Array::bounded(0, &mut self.writer)?;
Ok(())
}
#[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: Serialize + ?Sized>(
self,
_name: &'static str,
value: &T
) -> Result<Self::Ok, Self::Error> {
value.serialize(self)
}
#[inline]
fn serialize_newtype_variant<T: Serialize + ?Sized>(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
value: &T
) -> Result<Self::Ok, Self::Error> {
types::Map::bounded(1, &mut self.writer)?;
variant.encode(&mut self.writer)?;
value.serialize(self)
}
#[inline]
fn serialize_seq(self, len: Option<usize>)
-> Result<Self::SerializeSeq, Self::Error>
{
if let Some(len) = len {
types::Array::bounded(len, &mut self.writer)?;
} else {
types::Array::unbounded(&mut self.writer)?;
}
Ok(Collect {
bounded: len.is_some(),
ser: self
})
}
#[inline]
fn serialize_tuple(self, len: usize)
-> Result<Self::SerializeTuple, Self::Error>
{
types::Array::bounded(len, &mut self.writer)?;
Ok(BoundedCollect { ser: self })
}
#[inline]
fn serialize_tuple_struct(self, _name: &'static str, len: usize)
-> Result<Self::SerializeTupleStruct, Self::Error>
{
self.serialize_tuple(len)
}
#[inline]
fn serialize_tuple_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
len: usize
) -> Result<Self::SerializeTupleVariant, Self::Error> {
types::Map::bounded(1, &mut self.writer)?;
variant.encode(&mut self.writer)?;
types::Array::bounded(len, &mut self.writer)?;
Ok(BoundedCollect { ser: self })
}
#[inline]
fn serialize_map(self, len: Option<usize>)
-> Result<Self::SerializeMap, Self::Error>
{
if let Some(len) = len {
types::Map::bounded(len, &mut self.writer)?;
} else {
types::Map::unbounded(&mut self.writer)?;
}
Ok(Collect {
bounded: len.is_some(),
ser: self
})
}
#[inline]
fn serialize_struct(self, _name: &'static str, len: usize)
-> Result<Self::SerializeStruct, Self::Error>
{
types::Map::bounded(len, &mut self.writer)?;
Ok(BoundedCollect { ser: self })
}
#[inline]
fn serialize_struct_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
len: usize
) -> Result<Self::SerializeStructVariant, Self::Error> {
types::Map::bounded(1, &mut self.writer)?;
variant.encode(&mut self.writer)?;
types::Map::bounded(len, &mut self.writer)?;
Ok(BoundedCollect { ser: self })
}
#[inline]
fn serialize_i128(self, v: i128) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn serialize_u128(self, v: u128) -> Result<Self::Ok, Self::Error> {
v.encode(&mut self.writer)?;
Ok(())
}
#[inline]
fn collect_str<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
where
T: fmt::Display,
{
collect_str(&mut self.writer, &value)
}
#[inline]
fn is_human_readable(&self) -> bool {
false
}
}
pub struct Collect<'a, W> {
bounded: bool,
ser: &'a mut Serializer<W>
}
pub struct BoundedCollect<'a, W> {
ser: &'a mut Serializer<W>
}
impl<W: enc::Write> serde::ser::SerializeSeq for Collect<'_, W> {
type Ok = ();
type Error = EncodeError<W::Error>;
#[inline]
fn serialize_element<T: Serialize + ?Sized>(&mut self, value: &T)
-> Result<(), Self::Error>
{
value.serialize(&mut *self.ser)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
if !self.bounded {
types::Array::end(&mut self.ser.writer)?;
}
Ok(())
}
}
impl<W: enc::Write> serde::ser::SerializeTuple for BoundedCollect<'_, W> {
type Ok = ();
type Error = EncodeError<W::Error>;
#[inline]
fn serialize_element<T: Serialize + ?Sized>(&mut self, value: &T)
-> Result<(), Self::Error>
{
value.serialize(&mut *self.ser)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<W: enc::Write> serde::ser::SerializeTupleStruct for BoundedCollect<'_, W> {
type Ok = ();
type Error = EncodeError<W::Error>;
#[inline]
fn serialize_field<T: Serialize + ?Sized>(&mut self, value: &T)
-> Result<(), Self::Error>
{
value.serialize(&mut *self.ser)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<W: enc::Write> serde::ser::SerializeTupleVariant for BoundedCollect<'_, W> {
type Ok = ();
type Error = EncodeError<W::Error>;
#[inline]
fn serialize_field<T: Serialize + ?Sized>(&mut self, value: &T)
-> Result<(), Self::Error>
{
value.serialize(&mut *self.ser)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<W: enc::Write> serde::ser::SerializeMap for Collect<'_, W> {
type Ok = ();
type Error = EncodeError<W::Error>;
#[inline]
fn serialize_key<T: Serialize + ?Sized>(&mut self, key: &T)
-> Result<(), Self::Error>
{
key.serialize(&mut *self.ser)
}
#[inline]
fn serialize_value<T: Serialize + ?Sized>(&mut self, value: &T)
-> Result<(), Self::Error>
{
value.serialize(&mut *self.ser)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
if !self.bounded {
types::Map::end(&mut self.ser.writer)?;
}
Ok(())
}
}
impl<W: enc::Write> serde::ser::SerializeStruct for BoundedCollect<'_, W> {
type Ok = ();
type Error = EncodeError<W::Error>;
#[inline]
fn serialize_field<T: Serialize + ?Sized>(&mut self, key: &'static str, value: &T)
-> Result<(), Self::Error>
{
key.serialize(&mut *self.ser)?;
value.serialize(&mut *self.ser)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<W: enc::Write> serde::ser::SerializeStructVariant for BoundedCollect<'_, W> {
type Ok = ();
type Error = EncodeError<W::Error>;
#[inline]
fn serialize_field<T: Serialize + ?Sized>(&mut self, key: &'static str, value: &T)
-> Result<(), Self::Error>
{
key.serialize(&mut *self.ser)?;
value.serialize(&mut *self.ser)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
fn collect_str<W: enc::Write>(writer: &mut W, value: &dyn fmt::Display)
-> Result<(), EncodeError<W::Error>>
{
use core::fmt::Write;
use serde::ser::Error;
let mut writer = FmtWriter::new(writer);
if let Err(err) = write!(&mut writer, "{}", value) {
if !writer.is_error() {
return Err(EncodeError::custom(err));
}
}
writer.flush()?;
Ok(())
}
struct FmtWriter<'a, W: enc::Write> {
inner: &'a mut W,
buf: [u8; 255],
pos: u8,
state: State<enc::Error<W::Error>>,
}
enum State<E> {
Short,
Segment,
Error(E)
}
impl<W: enc::Write> fmt::Write for FmtWriter<'_, W> {
#[inline]
fn write_str(&mut self, input: &str) -> fmt::Result {
macro_rules! try_ {
( $e:expr ) => {
match $e {
Ok(v) => v,
Err(err) => {
self.state = State::Error(err);
return Err(fmt::Error);
}
}
}
}
debug_assert!(usize::from(u8::MAX) >= self.buf.len());
match self.state {
State::Short => if usize::from(self.pos) + input.len() > self.buf.len() {
self.state = State::Segment;
try_!(types::UncheckedStr::unbounded(self.inner));
},
State::Segment => (),
State::Error(_) => return Err(fmt::Error)
}
loop {
if let Some(buf) = self.buf.get_mut(self.pos.into()..)
.and_then(|buf| buf.get_mut(..input.len()))
{
use core::convert::TryInto;
buf.copy_from_slice(input.as_bytes());
let len: u8 = input.len().try_into().unwrap(); self.pos += len;
break
}
if self.pos > 0 {
try_!(types::UncheckedStr(&self.buf[..self.pos.into()]).encode(self.inner));
self.pos = 0;
}
if input.len() > self.buf.len() {
try_!(input.encode(self.inner));
break
}
}
Ok(())
}
}
impl<W: enc::Write> FmtWriter<'_, W> {
#[inline]
fn new(inner: &mut W) -> FmtWriter<'_, W> {
FmtWriter {
inner,
buf: [0; 255],
pos: 0,
state: State::Short,
}
}
#[inline]
fn is_error(&self) -> bool {
matches!(self.state, State::Error(_))
}
#[inline]
fn flush(self) -> Result<(), enc::Error<W::Error>> {
match self.state {
State::Short | State::Segment => {
if matches!(self.state, State::Short) || self.pos != 0 {
types::UncheckedStr(&self.buf[..self.pos.into()]).encode(self.inner)?;
}
if matches!(self.state, State::Segment) {
types::UncheckedStr::end(self.inner)?;
}
Ok(())
},
State::Error(err) => Err(err),
}
}
}