use std::convert::TryFrom;
use std::fmt::{self, Formatter};
use std::slice;
use serde::de::{
DeserializeSeed, EnumAccess, Error as SError, Expected, IntoDeserializer, MapAccess, SeqAccess,
Unexpected, VariantAccess, Visitor,
};
use serde::{forward_to_deserialize_any, Deserialize, Deserializer};
use serde_json::error::Error;
use super::array::IArray;
use super::number::INumber;
use super::object::IObject;
use super::string::IString;
use super::value::{DestructuredRef, IValue};
impl<'de> Deserialize<'de> for IValue {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_any(ValueVisitor)
}
}
impl<'de> Deserialize<'de> for INumber {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_any(NumberVisitor)
}
}
impl<'de> Deserialize<'de> for IString {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_str(StringVisitor)
}
}
impl<'de> Deserialize<'de> for IArray {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_seq(ArrayVisitor)
}
}
impl<'de> Deserialize<'de> for IObject {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_map(ObjectVisitor)
}
}
struct ValueVisitor;
impl<'de> Visitor<'de> for ValueVisitor {
type Value = IValue;
fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
formatter.write_str("any valid JSON value")
}
#[inline]
fn visit_bool<E: SError>(self, value: bool) -> Result<IValue, E> {
Ok(value.into())
}
#[inline]
fn visit_i64<E: SError>(self, value: i64) -> Result<IValue, E> {
Ok(value.into())
}
#[inline]
fn visit_u64<E: SError>(self, value: u64) -> Result<IValue, E> {
Ok(value.into())
}
#[inline]
fn visit_f64<E: SError>(self, value: f64) -> Result<IValue, E> {
Ok(value.into())
}
#[inline]
fn visit_str<E: SError>(self, value: &str) -> Result<IValue, E> {
Ok(value.into())
}
#[inline]
fn visit_string<E: SError>(self, value: String) -> Result<IValue, E> {
Ok(value.into())
}
#[inline]
fn visit_none<E: SError>(self) -> Result<IValue, E> {
Ok(IValue::NULL)
}
#[inline]
fn visit_some<D>(self, deserializer: D) -> Result<IValue, D::Error>
where
D: Deserializer<'de>,
{
Deserialize::deserialize(deserializer)
}
#[inline]
fn visit_unit<E: SError>(self) -> Result<IValue, E> {
Ok(IValue::NULL)
}
#[inline]
fn visit_seq<V>(self, visitor: V) -> Result<IValue, V::Error>
where
V: SeqAccess<'de>,
{
ArrayVisitor.visit_seq(visitor).map(Into::into)
}
fn visit_map<V>(self, visitor: V) -> Result<IValue, V::Error>
where
V: MapAccess<'de>,
{
ObjectVisitor.visit_map(visitor).map(Into::into)
}
}
struct NumberVisitor;
impl<'de> Visitor<'de> for NumberVisitor {
type Value = INumber;
fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
formatter.write_str("JSON number")
}
#[inline]
fn visit_i64<E: SError>(self, value: i64) -> Result<INumber, E> {
Ok(value.into())
}
#[inline]
fn visit_u64<E: SError>(self, value: u64) -> Result<INumber, E> {
Ok(value.into())
}
#[inline]
fn visit_f64<E: SError>(self, value: f64) -> Result<INumber, E> {
INumber::try_from(value).map_err(|_| E::invalid_value(Unexpected::Float(value), &self))
}
}
struct StringVisitor;
impl<'de> Visitor<'de> for StringVisitor {
type Value = IString;
fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
formatter.write_str("JSON string")
}
#[inline]
fn visit_str<E: SError>(self, value: &str) -> Result<IString, E> {
Ok(value.into())
}
}
struct ArrayVisitor;
impl<'de> Visitor<'de> for ArrayVisitor {
type Value = IArray;
fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
formatter.write_str("JSON array")
}
#[inline]
fn visit_seq<V>(self, mut visitor: V) -> Result<IArray, V::Error>
where
V: SeqAccess<'de>,
{
let mut arr = IArray::with_capacity(visitor.size_hint().unwrap_or(0));
while let Some(v) = visitor.next_element::<IValue>()? {
arr.push(v);
}
Ok(arr)
}
}
struct ObjectVisitor;
impl<'de> Visitor<'de> for ObjectVisitor {
type Value = IObject;
fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
formatter.write_str("JSON object")
}
fn visit_map<V>(self, mut visitor: V) -> Result<IObject, V::Error>
where
V: MapAccess<'de>,
{
let mut obj = IObject::with_capacity(visitor.size_hint().unwrap_or(0));
while let Some((k, v)) = visitor.next_entry::<IString, IValue>()? {
obj.insert(k, v);
}
Ok(obj)
}
}
macro_rules! deserialize_number {
($method:ident) => {
fn $method<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
if let Some(v) = self.as_number() {
v.deserialize_any(visitor)
} else {
Err(self.invalid_type(&visitor))
}
}
};
}
impl<'de> Deserializer<'de> for &'de IValue {
type Error = Error;
#[inline]
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
match self.destructure_ref() {
DestructuredRef::Null => visitor.visit_unit(),
DestructuredRef::Bool(v) => visitor.visit_bool(v),
DestructuredRef::Number(v) => v.deserialize_any(visitor),
DestructuredRef::String(v) => v.deserialize_any(visitor),
DestructuredRef::Array(v) => v.deserialize_any(visitor),
DestructuredRef::Object(v) => v.deserialize_any(visitor),
}
}
deserialize_number!(deserialize_i8);
deserialize_number!(deserialize_i16);
deserialize_number!(deserialize_i32);
deserialize_number!(deserialize_i64);
deserialize_number!(deserialize_u8);
deserialize_number!(deserialize_u16);
deserialize_number!(deserialize_u32);
deserialize_number!(deserialize_u64);
deserialize_number!(deserialize_f32);
deserialize_number!(deserialize_f64);
#[inline]
fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
if self.is_null() {
visitor.visit_none()
} else {
visitor.visit_some(self)
}
}
#[inline]
fn deserialize_enum<V>(
self,
name: &'static str,
variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
match self.destructure_ref() {
DestructuredRef::String(v) => v.deserialize_enum(name, variants, visitor),
DestructuredRef::Object(v) => v.deserialize_enum(name, variants, visitor),
other => Err(SError::invalid_type(other.unexpected(), &"string or map")),
}
}
#[inline]
fn deserialize_newtype_struct<V>(
self,
_name: &'static str,
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
visitor.visit_newtype_struct(self)
}
fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
if let Some(v) = self.to_bool() {
visitor.visit_bool(v)
} else {
Err(self.invalid_type(&visitor))
}
}
fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
self.deserialize_str(visitor)
}
fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
if let Some(v) = self.as_string() {
v.deserialize_str(visitor)
} else {
Err(self.invalid_type(&visitor))
}
}
fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
self.deserialize_str(visitor)
}
fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
match self.destructure_ref() {
DestructuredRef::String(v) => v.deserialize_bytes(visitor),
DestructuredRef::Array(v) => v.deserialize_bytes(visitor),
other => Err(other.invalid_type(&visitor)),
}
}
fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
self.deserialize_bytes(visitor)
}
fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
if self.is_null() {
visitor.visit_unit()
} else {
Err(self.invalid_type(&visitor))
}
}
fn deserialize_unit_struct<V>(self, _name: &'static str, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
self.deserialize_unit(visitor)
}
fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
if let Some(v) = self.as_array() {
v.deserialize_seq(visitor)
} else {
Err(self.invalid_type(&visitor))
}
}
fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
self.deserialize_seq(visitor)
}
fn deserialize_tuple_struct<V>(
self,
_name: &'static str,
_len: usize,
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
self.deserialize_seq(visitor)
}
fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
if let Some(v) = self.as_object() {
v.deserialize_map(visitor)
} else {
Err(self.invalid_type(&visitor))
}
}
fn deserialize_struct<V>(
self,
name: &'static str,
fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
match self.destructure_ref() {
DestructuredRef::Array(v) => v.deserialize_struct(name, fields, visitor),
DestructuredRef::Object(v) => v.deserialize_struct(name, fields, visitor),
other => Err(other.invalid_type(&visitor)),
}
}
fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
self.deserialize_str(visitor)
}
fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
visitor.visit_unit()
}
}
impl<'de> Deserializer<'de> for &'de INumber {
type Error = Error;
#[inline]
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
if self.has_decimal_point() {
visitor.visit_f64(self.to_f64().unwrap())
} else if let Some(v) = self.to_i64() {
visitor.visit_i64(v)
} else {
visitor.visit_u64(self.to_u64().unwrap())
}
}
#[inline]
fn deserialize_newtype_struct<V>(
self,
_name: &'static str,
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
visitor.visit_newtype_struct(self)
}
forward_to_deserialize_any! {
bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
bytes byte_buf option unit unit_struct seq tuple
tuple_struct map struct enum identifier ignored_any
}
}
impl<'de> Deserializer<'de> for &'de IString {
type Error = Error;
#[inline]
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
visitor.visit_borrowed_str(self.as_str())
}
fn deserialize_enum<V>(
self,
_name: &str,
_variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
visitor.visit_enum(EnumDeserializer {
variant: self,
value: None,
})
}
#[inline]
fn deserialize_newtype_struct<V>(
self,
_name: &'static str,
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
visitor.visit_newtype_struct(self)
}
forward_to_deserialize_any! {
bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
bytes byte_buf option unit unit_struct seq tuple
tuple_struct map struct identifier ignored_any
}
}
impl<'de> Deserializer<'de> for &'de IArray {
type Error = Error;
#[inline]
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
let len = self.len();
let mut deserializer = ArrayAccess::new(self);
let seq = visitor.visit_seq(&mut deserializer)?;
let remaining = deserializer.iter.len();
if remaining == 0 {
Ok(seq)
} else {
Err(SError::invalid_length(len, &"fewer elements in array"))
}
}
#[inline]
fn deserialize_newtype_struct<V>(
self,
_name: &'static str,
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
visitor.visit_newtype_struct(self)
}
forward_to_deserialize_any! {
bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
bytes byte_buf option unit unit_struct seq tuple
tuple_struct map struct enum identifier ignored_any
}
}
impl<'de> Deserializer<'de> for &'de IObject {
type Error = Error;
#[inline]
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
let len = self.len();
let mut deserializer = ObjectAccess::new(self);
let seq = visitor.visit_map(&mut deserializer)?;
let remaining = deserializer.iter.len();
if remaining == 0 {
Ok(seq)
} else {
Err(SError::invalid_length(len, &"fewer elements in object"))
}
}
#[inline]
fn deserialize_enum<V>(
self,
_name: &'static str,
_variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
let mut iter = self.iter();
let (variant, value) = iter
.next()
.ok_or_else(|| SError::invalid_value(Unexpected::Map, &"object with a single key"))?;
if iter.next().is_some() {
return Err(SError::invalid_value(
Unexpected::Map,
&"object with a single key",
));
}
visitor.visit_enum(EnumDeserializer {
variant,
value: Some(value),
})
}
#[inline]
fn deserialize_newtype_struct<V>(
self,
_name: &'static str,
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
visitor.visit_newtype_struct(self)
}
forward_to_deserialize_any! {
bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
bytes byte_buf option unit unit_struct seq tuple
tuple_struct map struct identifier ignored_any
}
}
trait MaybeUnexpected<'de>: Sized {
fn invalid_type<E>(self, exp: &dyn Expected) -> E
where
E: SError,
{
SError::invalid_type(self.unexpected(), exp)
}
fn unexpected(self) -> Unexpected<'de>;
}
impl<'de> MaybeUnexpected<'de> for &'de IValue {
fn unexpected(self) -> Unexpected<'de> {
self.destructure_ref().unexpected()
}
}
impl<'de> MaybeUnexpected<'de> for DestructuredRef<'de> {
fn unexpected(self) -> Unexpected<'de> {
match self {
Self::Null => Unexpected::Unit,
Self::Bool(b) => Unexpected::Bool(b),
Self::Number(v) => v.unexpected(),
Self::String(v) => v.unexpected(),
Self::Array(v) => v.unexpected(),
Self::Object(v) => v.unexpected(),
}
}
}
impl<'de> MaybeUnexpected<'de> for &'de INumber {
fn unexpected(self) -> Unexpected<'de> {
if self.has_decimal_point() {
Unexpected::Float(self.to_f64().unwrap())
} else if let Some(v) = self.to_i64() {
Unexpected::Signed(v)
} else {
Unexpected::Unsigned(self.to_u64().unwrap())
}
}
}
impl<'de> MaybeUnexpected<'de> for &'de IString {
fn unexpected(self) -> Unexpected<'de> {
Unexpected::Str(self.as_str())
}
}
impl<'de> MaybeUnexpected<'de> for &'de IArray {
fn unexpected(self) -> Unexpected<'de> {
Unexpected::Seq
}
}
impl<'de> MaybeUnexpected<'de> for &'de IObject {
fn unexpected(self) -> Unexpected<'de> {
Unexpected::Map
}
}
struct EnumDeserializer<'de> {
variant: &'de IString,
value: Option<&'de IValue>,
}
impl<'de> EnumAccess<'de> for EnumDeserializer<'de> {
type Error = Error;
type Variant = VariantDeserializer<'de>;
fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), Error>
where
V: DeserializeSeed<'de>,
{
let variant = self.variant.into_deserializer();
let visitor = VariantDeserializer { value: self.value };
seed.deserialize(variant).map(|v| (v, visitor))
}
}
impl<'de> IntoDeserializer<'de, Error> for &'de IString {
type Deserializer = Self;
fn into_deserializer(self) -> Self::Deserializer {
self
}
}
struct VariantDeserializer<'de> {
value: Option<&'de IValue>,
}
impl<'de> VariantAccess<'de> for VariantDeserializer<'de> {
type Error = Error;
fn unit_variant(self) -> Result<(), Error> {
if let Some(value) = self.value {
Deserialize::deserialize(value)
} else {
Ok(())
}
}
fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Error>
where
T: DeserializeSeed<'de>,
{
if let Some(value) = self.value {
seed.deserialize(value)
} else {
Err(SError::invalid_type(
Unexpected::UnitVariant,
&"newtype variant",
))
}
}
fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
match self.value.map(|v| v.destructure_ref()) {
Some(DestructuredRef::Array(v)) => v.deserialize_any(visitor),
Some(other) => Err(SError::invalid_type(other.unexpected(), &"tuple variant")),
None => Err(SError::invalid_type(
Unexpected::UnitVariant,
&"tuple variant",
)),
}
}
fn struct_variant<V>(
self,
_fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Error>
where
V: Visitor<'de>,
{
match self.value.map(|v| v.destructure_ref()) {
Some(DestructuredRef::Object(v)) => v.deserialize_any(visitor),
Some(other) => Err(SError::invalid_type(other.unexpected(), &"struct variant")),
None => Err(SError::invalid_type(
Unexpected::UnitVariant,
&"struct variant",
)),
}
}
}
struct ArrayAccess<'de> {
iter: slice::Iter<'de, IValue>,
}
impl<'de> ArrayAccess<'de> {
fn new(slice: &'de [IValue]) -> Self {
ArrayAccess { iter: slice.iter() }
}
}
impl<'de> SeqAccess<'de> for ArrayAccess<'de> {
type Error = Error;
fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error>
where
T: DeserializeSeed<'de>,
{
match self.iter.next() {
Some(value) => seed.deserialize(value).map(Some),
None => Ok(None),
}
}
fn size_hint(&self) -> Option<usize> {
match self.iter.size_hint() {
(lower, Some(upper)) if lower == upper => Some(upper),
_ => None,
}
}
}
struct ObjectAccess<'de> {
iter: <&'de IObject as IntoIterator>::IntoIter,
value: Option<&'de IValue>,
}
impl<'de> ObjectAccess<'de> {
fn new(obj: &'de IObject) -> Self {
ObjectAccess {
iter: obj.into_iter(),
value: None,
}
}
}
impl<'de> MapAccess<'de> for ObjectAccess<'de> {
type Error = Error;
fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error>
where
T: DeserializeSeed<'de>,
{
if let Some((key, value)) = self.iter.next() {
self.value = Some(value);
seed.deserialize(key).map(Some)
} else {
Ok(None)
}
}
fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Error>
where
T: DeserializeSeed<'de>,
{
if let Some(value) = self.value.take() {
seed.deserialize(value)
} else {
Err(SError::custom("value is missing"))
}
}
fn size_hint(&self) -> Option<usize> {
match self.iter.size_hint() {
(lower, Some(upper)) if lower == upper => Some(upper),
_ => None,
}
}
}
pub fn from_value<'de, T>(value: &'de IValue) -> Result<T, Error>
where
T: Deserialize<'de>,
{
T::deserialize(value)
}