use std::fmt;
use std::vec;
use std::result;
use std::marker::PhantomData;
use std::{i32, u32};
use serde::de::{self, Deserialize, Deserializer, Visitor, MapAccess, SeqAccess, VariantAccess,
DeserializeSeed, EnumAccess};
use serde::de::{Error, Expected, Unexpected};
use indexmap::IndexMap;
use crate::value::{Value, TimeStamp, Binary};
use crate::message::{Message, IntoIter};
use crate::array::Array;
use crate::message_id::MessageId;
use crate::decode::DecodeError;
use crate::decode::DecodeResult;
impl de::Error for DecodeError {
fn custom<T: fmt::Display>(msg: T) -> DecodeError {
DecodeError::Unknown(msg.to_string())
}
fn invalid_type(_unexp: Unexpected, exp: &dyn Expected) -> DecodeError {
DecodeError::InvalidType(exp.to_string())
}
fn invalid_value(_unexp: Unexpected, exp: &dyn Expected) -> DecodeError {
DecodeError::InvalidValue(exp.to_string())
}
fn invalid_length(len: usize, exp: &dyn Expected) -> DecodeError {
DecodeError::InvalidLength(len, exp.to_string())
}
fn unknown_variant(variant: &str, _expected: &'static [&'static str]) -> DecodeError {
DecodeError::UnknownVariant(variant.to_string())
}
fn unknown_field(field: &str, _expected: &'static [&'static str]) -> DecodeError {
DecodeError::UnknownField(field.to_string())
}
fn missing_field(field: &'static str) -> DecodeError {
DecodeError::ExpectedField(field)
}
fn duplicate_field(field: &'static str) -> DecodeError {
DecodeError::DuplicatedField(field)
}
}
impl<'de> Deserialize<'de> for Message {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>
{
deserializer
.deserialize_map(ValueVisitor)
.and_then(|nson|
if let Value::Message(message) = nson {
Ok(message)
} else {
let err = format!("expected message, found extended JSON data type: {}", nson);
Err(de::Error::invalid_type(Unexpected::Map, &&*err))
})
}
}
impl<'de> Deserialize<'de> for Value {
#[inline]
fn deserialize<D>(deserializer: D) -> Result<Value, D::Error>
where D: Deserializer<'de>
{
deserializer.deserialize_any(ValueVisitor)
}
}
pub struct ValueVisitor;
impl<'de> Visitor<'de> for ValueVisitor {
type Value = Value;
fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "expecting a Value")
}
#[inline]
fn visit_bool<E>(self, value: bool) -> Result<Value, E>
where E: Error
{
Ok(Value::Bool(value))
}
#[inline]
fn visit_i8<E>(self, value: i8) -> Result<Value, E>
where E: Error
{
Ok(Value::I32(i32::from(value)))
}
#[inline]
fn visit_u8<E>(self, value: u8) -> Result<Value, E>
where E: Error
{
Ok(Value::U32(u32::from(value)))
}
#[inline]
fn visit_i16<E>(self, value: i16) -> Result<Value, E>
where E: Error
{
Ok(Value::I32(i32::from(value)))
}
#[inline]
fn visit_u16<E>(self, value: u16) -> Result<Value, E>
where E: Error
{
Ok(Value::U32(u32::from(value)))
}
#[inline]
fn visit_i32<E>(self, value: i32) -> Result<Value, E>
where E: Error
{
Ok(Value::I32(value))
}
#[inline]
fn visit_u32<E>(self, value: u32) -> Result<Value, E>
where E: Error
{
Ok(Value::U32(value))
}
#[inline]
fn visit_i64<E>(self, value: i64) -> Result<Value, E>
where E: Error
{
Ok(Value::I64(value))
}
#[inline]
fn visit_u64<E>(self, value: u64) -> Result<Value, E>
where E: Error
{
Ok(Value::U64(value))
}
#[inline]
fn visit_f32<E>(self, value: f32) -> Result<Value, E> {
Ok(Value::F32(value))
}
#[inline]
fn visit_f64<E>(self, value: f64) -> Result<Value, E> {
Ok(Value::F64(value))
}
#[inline]
fn visit_str<E>(self, value: &str) -> Result<Value, E>
where E: de::Error
{
self.visit_string(value.to_string())
}
#[inline]
fn visit_string<E>(self, value: String) -> Result<Value, E> {
Ok(Value::String(value))
}
#[inline]
fn visit_none<E>(self) -> Result<Value, E> {
Ok(Value::Null)
}
#[inline]
fn visit_some<D>(self, deserializer: D) -> Result<Value, D::Error>
where D: Deserializer<'de>
{
deserializer.deserialize_any(self)
}
#[inline]
fn visit_unit<E>(self) -> Result<Value, E> {
Ok(Value::Null)
}
#[inline]
fn visit_seq<V>(self, mut visitor: V) -> Result<Value, V::Error>
where V: SeqAccess<'de>
{
let mut values = Array::new();
while let Some(elem) = visitor.next_element()? {
values.push_value(elem);
}
Ok(Value::Array(values))
}
#[inline]
fn visit_map<V>(self, visitor: V) -> Result<Value, V::Error>
where V: MapAccess<'de>
{
let values = MessageVisitor::new().visit_map(visitor)?;
Ok(Value::from_extended_message(values))
}
#[inline]
fn visit_bytes<E>(self, v: &[u8]) -> Result<Value, E>
where E: Error,
{
Ok(Value::Binary(v.to_vec().into()))
}
}
#[derive(Default)]
pub struct MessageVisitor {
marker: PhantomData<Message>
}
impl MessageVisitor {
pub fn new() -> MessageVisitor {
MessageVisitor { marker: PhantomData }
}
}
impl<'de> Visitor<'de> for MessageVisitor {
type Value = Message;
fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "expecting ordered object")
}
#[inline]
fn visit_unit<E>(self) -> result::Result<Message, E>
where E: de::Error
{
Ok(Message::new())
}
#[inline]
fn visit_map<V>(self, mut visitor: V) -> result::Result<Message, V::Error>
where V: MapAccess<'de>
{
let mut inner = match visitor.size_hint() {
Some(size) => IndexMap::with_capacity(size),
None => IndexMap::new(),
};
while let Some((key, value)) = visitor.next_entry()? {
inner.insert(key, value);
}
Ok(inner.into())
}
}
pub struct Decoder {
value: Option<Value>,
}
impl Decoder {
pub fn new(value: Value) -> Decoder {
Decoder { value: Some(value) }
}
}
macro_rules! forward_to_deserialize {
($(
$name:ident ( $( $arg:ident : $ty:ty ),* );
)*) => {
$(
forward_to_deserialize!{
func: $name ( $( $arg: $ty ),* );
}
)*
};
(func: deserialize_enum ( $( $arg:ident : $ty:ty ),* );) => {
fn deserialize_enum<V>(
self,
$(_: $ty,)*
_visitor: V,
) -> ::std::result::Result<V::Value, Self::Error>
where V: ::serde::de::Visitor<'de>
{
Err(::serde::de::Error::custom("unexpected Enum"))
}
};
(func: $name:ident ( $( $arg:ident : $ty:ty ),* );) => {
#[inline]
fn $name<V>(
self,
$(_: $ty,)*
visitor: V,
) -> ::std::result::Result<V::Value, Self::Error>
where V: ::serde::de::Visitor<'de>
{
self.deserialize_any(visitor)
}
};
}
impl<'de> Deserializer<'de> for Decoder {
type Error = DecodeError;
#[inline]
fn deserialize_any<V>(mut self, visitor: V) -> DecodeResult<V::Value>
where V: Visitor<'de>
{
let value = match self.value.take() {
Some(value) => value,
None => return Err(DecodeError::EndOfStream),
};
match value {
Value::F32(v) => visitor.visit_f32(v),
Value::F64(v) => visitor.visit_f64(v),
Value::I32(v) => visitor.visit_i32(v),
Value::I64(v) => visitor.visit_i64(v),
Value::U32(v) => visitor.visit_u32(v),
Value::U64(v) => visitor.visit_u64(v),
Value::String(v) => visitor.visit_string(v),
Value::Array(v) => {
let len = v.len();
visitor.visit_seq(
SeqDecoder {
iter: v.into_iter(),
len,
}
)
}
Value::Message(v) => {
let len = v.len();
visitor.visit_map(
MapDecoder {
iter: v.into_iter(),
value: None,
len,
}
)
}
Value::Bool(v) => visitor.visit_bool(v),
Value::Null => visitor.visit_unit(),
Value::Binary(v) => visitor.visit_bytes(&v.0),
_ => {
let message = value.to_extended_message();
let len = message.len();
visitor.visit_map(
MapDecoder {
iter: message.into_iter(),
value: None,
len,
}
)
}
}
}
#[inline]
fn deserialize_option<V>(self, visitor: V) -> DecodeResult<V::Value>
where V: Visitor<'de>
{
match self.value {
Some(Value::Null) => visitor.visit_none(),
Some(_) => visitor.visit_some(self),
None => Err(DecodeError::EndOfStream),
}
}
#[inline]
fn deserialize_enum<V>(
mut self,
_name: &str,
_variants: &'static [&'static str],
visitor: V
) -> DecodeResult<V::Value>
where V: Visitor<'de>
{
let value = match self.value.take() {
Some(Value::Message(value)) => value,
Some(Value::String(variant)) => {
return visitor.visit_enum(
EnumDecoder {
val: Value::String(variant),
decoder: VariantDecoder { val: None },
}
);
}
Some(_) => {
return Err(DecodeError::InvalidType("expected an enum".to_string()));
}
None => {
return Err(DecodeError::EndOfStream);
}
};
let mut iter = value.into_iter();
let (variant, value) = match iter.next() {
Some(v) => v,
None => return Err(DecodeError::SyntaxError("expected a variant name".to_string())),
};
match iter.next() {
Some(_) => {
Err(DecodeError::InvalidType("expected a single key:value pair".to_string()))
}
None => {
visitor.visit_enum(
EnumDecoder {
val: Value::String(variant),
decoder: VariantDecoder { val: Some(value) },
}
)
}
}
}
#[inline]
fn deserialize_newtype_struct<V>(
self,
_name: &'static str,
visitor: V
) -> DecodeResult<V::Value>
where V: Visitor<'de>
{
visitor.visit_newtype_struct(self)
}
forward_to_deserialize!{
deserialize_bool();
deserialize_u8();
deserialize_u16();
deserialize_u32();
deserialize_u64();
deserialize_i8();
deserialize_i16();
deserialize_i32();
deserialize_i64();
deserialize_f32();
deserialize_f64();
deserialize_char();
deserialize_str();
deserialize_string();
deserialize_unit();
deserialize_seq();
deserialize_bytes();
deserialize_map();
deserialize_unit_struct(name: &'static str);
deserialize_tuple_struct(name: &'static str, len: usize);
deserialize_struct(name: &'static str, fields: &'static [&'static str]);
deserialize_tuple(len: usize);
deserialize_identifier();
deserialize_ignored_any();
deserialize_byte_buf();
}
}
struct EnumDecoder {
val: Value,
decoder: VariantDecoder,
}
impl<'de> EnumAccess<'de> for EnumDecoder {
type Error = DecodeError;
type Variant = VariantDecoder;
fn variant_seed<V>(self, seed: V) -> DecodeResult<(V::Value, Self::Variant)>
where V: DeserializeSeed<'de>
{
let dec = Decoder::new(self.val);
let value = seed.deserialize(dec)?;
Ok((value, self.decoder))
}
}
struct VariantDecoder {
val: Option<Value>,
}
impl<'de> VariantAccess<'de> for VariantDecoder {
type Error = DecodeError;
fn unit_variant(mut self) -> DecodeResult<()> {
match self.val.take() {
None => Ok(()),
Some(val) => {
Value::deserialize(Decoder::new(val)).map(|_| ())
}
}
}
fn newtype_variant_seed<T>(mut self, seed: T) -> DecodeResult<T::Value>
where T: DeserializeSeed<'de>
{
let dec = Decoder::new(self.val.take().ok_or(DecodeError::EndOfStream)?);
seed.deserialize(dec)
}
fn tuple_variant<V>(mut self, _len: usize, visitor: V) -> DecodeResult<V::Value>
where V: Visitor<'de>
{
if let Value::Array(fields) = self.val.take().ok_or(DecodeError::EndOfStream)? {
let de = SeqDecoder {
len: fields.len(),
iter: fields.into_iter(),
};
de.deserialize_any(visitor)
} else {
Err(DecodeError::InvalidType("expected a tuple".to_string()))
}
}
fn struct_variant<V>(
mut self,
_fields: &'static [&'static str],
visitor: V
) -> DecodeResult<V::Value>
where V: Visitor<'de>
{
if let Value::Message(fields) = self.val.take().ok_or(DecodeError::EndOfStream)? {
let de = MapDecoder {
len: fields.len(),
iter: fields.into_iter(),
value: None,
};
de.deserialize_any(visitor)
} else {
Err(DecodeError::InvalidType("expected a struct".to_string()))
}
}
}
struct SeqDecoder {
iter: vec::IntoIter<Value>,
len: usize,
}
impl<'de> Deserializer<'de> for SeqDecoder {
type Error = DecodeError;
#[inline]
fn deserialize_any<V>(self, visitor: V) -> DecodeResult<V::Value>
where V: Visitor<'de>
{
if self.len == 0 {
visitor.visit_unit()
} else {
visitor.visit_seq(self)
}
}
forward_to_deserialize!{
deserialize_bool();
deserialize_u8();
deserialize_u16();
deserialize_u32();
deserialize_u64();
deserialize_i8();
deserialize_i16();
deserialize_i32();
deserialize_i64();
deserialize_f32();
deserialize_f64();
deserialize_char();
deserialize_str();
deserialize_string();
deserialize_unit();
deserialize_option();
deserialize_seq();
deserialize_bytes();
deserialize_map();
deserialize_unit_struct(name: &'static str);
deserialize_newtype_struct(name: &'static str);
deserialize_tuple_struct(name: &'static str, len: usize);
deserialize_struct(name: &'static str, fields: &'static [&'static str]);
deserialize_tuple(len: usize);
deserialize_enum(name: &'static str, variants: &'static [&'static str]);
deserialize_identifier();
deserialize_ignored_any();
deserialize_byte_buf();
}
}
impl<'de> SeqAccess<'de> for SeqDecoder {
type Error = DecodeError;
fn next_element_seed<T>(&mut self, seed: T) -> DecodeResult<Option<T::Value>>
where T: DeserializeSeed<'de>
{
match self.iter.next() {
None => Ok(None),
Some(value) => {
self.len -= 1;
let de = Decoder::new(value);
match seed.deserialize(de) {
Ok(value) => Ok(Some(value)),
Err(err) => Err(err),
}
}
}
}
fn size_hint(&self) -> Option<usize> {
Some(self.len)
}
}
struct MapDecoder {
iter: IntoIter<String, Value>,
value: Option<Value>,
len: usize,
}
impl<'de> MapAccess<'de> for MapDecoder {
type Error = DecodeError;
fn next_key_seed<K>(&mut self, seed: K) -> DecodeResult<Option<K::Value>>
where K: DeserializeSeed<'de>
{
match self.iter.next() {
Some((key, value)) => {
self.len -= 1;
self.value = Some(value);
let de = Decoder::new(Value::String(key));
match seed.deserialize(de) {
Ok(val) => Ok(Some(val)),
Err(DecodeError::UnknownField(_)) => Ok(None),
Err(e) => Err(e),
}
}
None => Ok(None),
}
}
fn next_value_seed<V>(&mut self, seed: V) -> DecodeResult<V::Value>
where V: DeserializeSeed<'de>
{
let value = self.value.take().ok_or(DecodeError::EndOfStream)?;
let de = Decoder::new(value);
seed.deserialize(de)
}
fn size_hint(&self) -> Option<usize> {
Some(self.len)
}
}
impl<'de> Deserializer<'de> for MapDecoder {
type Error = DecodeError;
#[inline]
fn deserialize_any<V>(self, visitor: V) -> DecodeResult<V::Value>
where V: Visitor<'de>
{
visitor.visit_map(self)
}
forward_to_deserialize!{
deserialize_bool();
deserialize_u8();
deserialize_u16();
deserialize_u32();
deserialize_u64();
deserialize_i8();
deserialize_i16();
deserialize_i32();
deserialize_i64();
deserialize_f32();
deserialize_f64();
deserialize_char();
deserialize_str();
deserialize_string();
deserialize_unit();
deserialize_option();
deserialize_seq();
deserialize_bytes();
deserialize_map();
deserialize_unit_struct(name: &'static str);
deserialize_newtype_struct(name: &'static str);
deserialize_tuple_struct(name: &'static str, len: usize);
deserialize_struct(name: &'static str, fields: &'static [&'static str]);
deserialize_tuple(len: usize);
deserialize_enum(name: &'static str, variants: &'static [&'static str]);
deserialize_identifier();
deserialize_ignored_any();
deserialize_byte_buf();
}
}
impl<'de> Deserialize<'de> for TimeStamp {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>
{
match Value::deserialize(deserializer)? {
Value::TimeStamp(ts) => {
let ts = ts.0.to_le();
Ok(TimeStamp(ts))
}
_ => Err(D::Error::custom("expecting TimeStamp")),
}
}
}
impl<'de> Deserialize<'de> for MessageId {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>
{
match Value::deserialize(deserializer)? {
Value::MessageId(id) => {
Ok(id)
}
_ => Err(D::Error::custom("expecting MessageId")),
}
}
}
impl<'de> Deserialize<'de> for Binary {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>
{
match Value::deserialize(deserializer)? {
Value::Binary(v) => {
Ok(v)
}
_ => Err(D::Error::custom("expecting Binary")),
}
}
}