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android / toolchain / rustc / 983137f038c4d4b95a0cd86b7c42d0313b50de67 / . / vendor / serde-1.0.99 / src / private / de.rs
blob: ffa5012dc7c6f3ceeadc593f19a9457b6f06358c [file] [log] [blame]
use lib::*;
use de::{Deserialize, DeserializeSeed, Deserializer, Error, IntoDeserializer, Visitor};
#[cfg(any(feature = "std", feature = "alloc"))]
use de::{MapAccess, Unexpected};
#[cfg(any(feature = "std", feature = "alloc"))]
pub use self::content::{
Content, ContentDeserializer, ContentRefDeserializer, EnumDeserializer,
InternallyTaggedUnitVisitor, TagContentOtherField, TagContentOtherFieldVisitor,
TagOrContentField, TagOrContentFieldVisitor, TaggedContentVisitor, UntaggedUnitVisitor,
};
/// If the missing field is of type `Option<T>` then treat is as `None`,
/// otherwise it is an error.
pub fn missing_field<'de, V, E>(field: &'static str) -> Result<V, E>
where
V: Deserialize<'de>,
E: Error,
{
struct MissingFieldDeserializer<E>(&'static str, PhantomData<E>);
impl<'de, E> Deserializer<'de> for MissingFieldDeserializer<E>
where
E: Error,
{
type Error = E;
fn deserialize_any<V>(self, _visitor: V) -> Result<V::Value, E>
where
V: Visitor<'de>,
{
Err(Error::missing_field(self.0))
}
fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, E>
where
V: Visitor<'de>,
{
visitor.visit_none()
}
forward_to_deserialize_any! {
bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
bytes byte_buf unit unit_struct newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any
}
}
let deserializer = MissingFieldDeserializer(field, PhantomData);
Deserialize::deserialize(deserializer)
}
#[cfg(any(feature = "std", feature = "alloc"))]
pub fn borrow_cow_str<'de: 'a, 'a, D>(deserializer: D) -> Result<Cow<'a, str>, D::Error>
where
D: Deserializer<'de>,
{
struct CowStrVisitor;
impl<'a> Visitor<'a> for CowStrVisitor {
type Value = Cow<'a, str>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a string")
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Cow::Owned(v.to_owned()))
}
fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Cow::Borrowed(v))
}
fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Cow::Owned(v))
}
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
where
E: Error,
{
match str::from_utf8(v) {
Ok(s) => Ok(Cow::Owned(s.to_owned())),
Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)),
}
}
fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E>
where
E: Error,
{
match str::from_utf8(v) {
Ok(s) => Ok(Cow::Borrowed(s)),
Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)),
}
}
fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
where
E: Error,
{
match String::from_utf8(v) {
Ok(s) => Ok(Cow::Owned(s)),
Err(e) => Err(Error::invalid_value(
Unexpected::Bytes(&e.into_bytes()),
&self,
)),
}
}
}
deserializer.deserialize_str(CowStrVisitor)
}
#[cfg(any(feature = "std", feature = "alloc"))]
pub fn borrow_cow_bytes<'de: 'a, 'a, D>(deserializer: D) -> Result<Cow<'a, [u8]>, D::Error>
where
D: Deserializer<'de>,
{
struct CowBytesVisitor;
impl<'a> Visitor<'a> for CowBytesVisitor {
type Value = Cow<'a, [u8]>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a byte array")
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Cow::Owned(v.as_bytes().to_vec()))
}
fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Cow::Borrowed(v.as_bytes()))
}
fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Cow::Owned(v.into_bytes()))
}
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Cow::Owned(v.to_vec()))
}
fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Cow::Borrowed(v))
}
fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Cow::Owned(v))
}
}
deserializer.deserialize_bytes(CowBytesVisitor)
}
pub mod size_hint {
use lib::*;
pub fn from_bounds<I>(iter: &I) -> Option<usize>
where
I: Iterator,
{
helper(iter.size_hint())
}
#[inline]
pub fn cautious(hint: Option<usize>) -> usize {
cmp::min(hint.unwrap_or(0), 4096)
}
fn helper(bounds: (usize, Option<usize>)) -> Option<usize> {
match bounds {
(lower, Some(upper)) if lower == upper => Some(upper),
_ => None,
}
}
}
#[cfg(any(feature = "std", feature = "alloc"))]
mod content {
// This module is private and nothing here should be used outside of
// generated code.
//
// We will iterate on the implementation for a few releases and only have to
// worry about backward compatibility for the `untagged` and `tag` attributes
// rather than for this entire mechanism.
//
// This issue is tracking making some of this stuff public:
// https://github.com/serde-rs/serde/issues/741
use lib::*;
use super::size_hint;
use de::{
self, Deserialize, DeserializeSeed, Deserializer, EnumAccess, Expected, IgnoredAny,
MapAccess, SeqAccess, Unexpected, Visitor,
};
/// Used from generated code to buffer the contents of the Deserializer when
/// deserializing untagged enums and internally tagged enums.
///
/// Not public API. Use serde-value instead.
#[derive(Debug)]
pub enum Content<'de> {
Bool(bool),
U8(u8),
U16(u16),
U32(u32),
U64(u64),
I8(i8),
I16(i16),
I32(i32),
I64(i64),
F32(f32),
F64(f64),
Char(char),
String(String),
Str(&'de str),
ByteBuf(Vec<u8>),
Bytes(&'de [u8]),
None,
Some(Box<Content<'de>>),
Unit,
Newtype(Box<Content<'de>>),
Seq(Vec<Content<'de>>),
Map(Vec<(Content<'de>, Content<'de>)>),
}
impl<'de> Content<'de> {
pub fn as_str(&self) -> Option<&str> {
match *self {
Content::Str(x) => Some(x),
Content::String(ref x) => Some(x),
Content::Bytes(x) => str::from_utf8(x).ok(),
Content::ByteBuf(ref x) => str::from_utf8(x).ok(),
_ => None,
}
}
#[cold]
fn unexpected(&self) -> Unexpected {
match *self {
Content::Bool(b) => Unexpected::Bool(b),
Content::U8(n) => Unexpected::Unsigned(n as u64),
Content::U16(n) => Unexpected::Unsigned(n as u64),
Content::U32(n) => Unexpected::Unsigned(n as u64),
Content::U64(n) => Unexpected::Unsigned(n),
Content::I8(n) => Unexpected::Signed(n as i64),
Content::I16(n) => Unexpected::Signed(n as i64),
Content::I32(n) => Unexpected::Signed(n as i64),
Content::I64(n) => Unexpected::Signed(n),
Content::F32(f) => Unexpected::Float(f as f64),
Content::F64(f) => Unexpected::Float(f),
Content::Char(c) => Unexpected::Char(c),
Content::String(ref s) => Unexpected::Str(s),
Content::Str(s) => Unexpected::Str(s),
Content::ByteBuf(ref b) => Unexpected::Bytes(b),
Content::Bytes(b) => Unexpected::Bytes(b),
Content::None | Content::Some(_) => Unexpected::Option,
Content::Unit => Unexpected::Unit,
Content::Newtype(_) => Unexpected::NewtypeStruct,
Content::Seq(_) => Unexpected::Seq,
Content::Map(_) => Unexpected::Map,
}
}
}
impl<'de> Deserialize<'de> for Content<'de> {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
// Untagged and internally tagged enums are only supported in
// self-describing formats.
let visitor = ContentVisitor { value: PhantomData };
deserializer.deserialize_any(visitor)
}
}
struct ContentVisitor<'de> {
value: PhantomData<Content<'de>>,
}
impl<'de> ContentVisitor<'de> {
fn new() -> Self {
ContentVisitor { value: PhantomData }
}
}
impl<'de> Visitor<'de> for ContentVisitor<'de> {
type Value = Content<'de>;
fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.write_str("any value")
}
fn visit_bool<F>(self, value: bool) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::Bool(value))
}
fn visit_i8<F>(self, value: i8) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::I8(value))
}
fn visit_i16<F>(self, value: i16) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::I16(value))
}
fn visit_i32<F>(self, value: i32) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::I32(value))
}
fn visit_i64<F>(self, value: i64) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::I64(value))
}
fn visit_u8<F>(self, value: u8) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::U8(value))
}
fn visit_u16<F>(self, value: u16) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::U16(value))
}
fn visit_u32<F>(self, value: u32) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::U32(value))
}
fn visit_u64<F>(self, value: u64) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::U64(value))
}
fn visit_f32<F>(self, value: f32) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::F32(value))
}
fn visit_f64<F>(self, value: f64) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::F64(value))
}
fn visit_char<F>(self, value: char) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::Char(value))
}
fn visit_str<F>(self, value: &str) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::String(value.into()))
}
fn visit_borrowed_str<F>(self, value: &'de str) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::Str(value))
}
fn visit_string<F>(self, value: String) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::String(value))
}
fn visit_bytes<F>(self, value: &[u8]) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::ByteBuf(value.into()))
}
fn visit_borrowed_bytes<F>(self, value: &'de [u8]) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::Bytes(value))
}
fn visit_byte_buf<F>(self, value: Vec<u8>) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::ByteBuf(value))
}
fn visit_unit<F>(self) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::Unit)
}
fn visit_none<F>(self) -> Result<Self::Value, F>
where
F: de::Error,
{
Ok(Content::None)
}
fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
Deserialize::deserialize(deserializer).map(|v| Content::Some(Box::new(v)))
}
fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
Deserialize::deserialize(deserializer).map(|v| Content::Newtype(Box::new(v)))
}
fn visit_seq<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
where
V: SeqAccess<'de>,
{
let mut vec = Vec::with_capacity(size_hint::cautious(visitor.size_hint()));
while let Some(e) = try!(visitor.next_element()) {
vec.push(e);
}
Ok(Content::Seq(vec))
}
fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
where
V: MapAccess<'de>,
{
let mut vec = Vec::with_capacity(size_hint::cautious(visitor.size_hint()));
while let Some(kv) = try!(visitor.next_entry()) {
vec.push(kv);
}
Ok(Content::Map(vec))
}
fn visit_enum<V>(self, _visitor: V) -> Result<Self::Value, V::Error>
where
V: EnumAccess<'de>,
{
Err(de::Error::custom(
"untagged and internally tagged enums do not support enum input",
))
}
}
/// This is the type of the map keys in an internally tagged enum.
///
/// Not public API.
pub enum TagOrContent<'de> {
Tag,
Content(Content<'de>),
}
struct TagOrContentVisitor<'de> {
name: &'static str,
value: PhantomData<TagOrContent<'de>>,
}
impl<'de> TagOrContentVisitor<'de> {
fn new(name: &'static str) -> Self {
TagOrContentVisitor {
name: name,
value: PhantomData,
}
}
}
impl<'de> DeserializeSeed<'de> for TagOrContentVisitor<'de> {
type Value = TagOrContent<'de>;
fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
// Internally tagged enums are only supported in self-describing
// formats.
deserializer.deserialize_any(self)
}
}
impl<'de> Visitor<'de> for TagOrContentVisitor<'de> {
type Value = TagOrContent<'de>;
fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "a type tag `{}` or any other value", self.name)
}
fn visit_bool<F>(self, value: bool) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_bool(value)
.map(TagOrContent::Content)
}
fn visit_i8<F>(self, value: i8) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_i8(value)
.map(TagOrContent::Content)
}
fn visit_i16<F>(self, value: i16) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_i16(value)
.map(TagOrContent::Content)
}
fn visit_i32<F>(self, value: i32) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_i32(value)
.map(TagOrContent::Content)
}
fn visit_i64<F>(self, value: i64) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_i64(value)
.map(TagOrContent::Content)
}
fn visit_u8<F>(self, value: u8) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_u8(value)
.map(TagOrContent::Content)
}
fn visit_u16<F>(self, value: u16) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_u16(value)
.map(TagOrContent::Content)
}
fn visit_u32<F>(self, value: u32) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_u32(value)
.map(TagOrContent::Content)
}
fn visit_u64<F>(self, value: u64) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_u64(value)
.map(TagOrContent::Content)
}
fn visit_f32<F>(self, value: f32) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_f32(value)
.map(TagOrContent::Content)
}
fn visit_f64<F>(self, value: f64) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_f64(value)
.map(TagOrContent::Content)
}
fn visit_char<F>(self, value: char) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_char(value)
.map(TagOrContent::Content)
}
fn visit_str<F>(self, value: &str) -> Result<Self::Value, F>
where
F: de::Error,
{
if value == self.name {
Ok(TagOrContent::Tag)
} else {
ContentVisitor::new()
.visit_str(value)
.map(TagOrContent::Content)
}
}
fn visit_borrowed_str<F>(self, value: &'de str) -> Result<Self::Value, F>
where
F: de::Error,
{
if value == self.name {
Ok(TagOrContent::Tag)
} else {
ContentVisitor::new()
.visit_borrowed_str(value)
.map(TagOrContent::Content)
}
}
fn visit_string<F>(self, value: String) -> Result<Self::Value, F>
where
F: de::Error,
{
if value == self.name {
Ok(TagOrContent::Tag)
} else {
ContentVisitor::new()
.visit_string(value)
.map(TagOrContent::Content)
}
}
fn visit_bytes<F>(self, value: &[u8]) -> Result<Self::Value, F>
where
F: de::Error,
{
if value == self.name.as_bytes() {
Ok(TagOrContent::Tag)
} else {
ContentVisitor::new()
.visit_bytes(value)
.map(TagOrContent::Content)
}
}
fn visit_borrowed_bytes<F>(self, value: &'de [u8]) -> Result<Self::Value, F>
where
F: de::Error,
{
if value == self.name.as_bytes() {
Ok(TagOrContent::Tag)
} else {
ContentVisitor::new()
.visit_borrowed_bytes(value)
.map(TagOrContent::Content)
}
}
fn visit_byte_buf<F>(self, value: Vec<u8>) -> Result<Self::Value, F>
where
F: de::Error,
{
if value == self.name.as_bytes() {
Ok(TagOrContent::Tag)
} else {
ContentVisitor::new()
.visit_byte_buf(value)
.map(TagOrContent::Content)
}
}
fn visit_unit<F>(self) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_unit()
.map(TagOrContent::Content)
}
fn visit_none<F>(self) -> Result<Self::Value, F>
where
F: de::Error,
{
ContentVisitor::new()
.visit_none()
.map(TagOrContent::Content)
}
fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
ContentVisitor::new()
.visit_some(deserializer)
.map(TagOrContent::Content)
}
fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
ContentVisitor::new()
.visit_newtype_struct(deserializer)
.map(TagOrContent::Content)
}
fn visit_seq<V>(self, visitor: V) -> Result<Self::Value, V::Error>
where
V: SeqAccess<'de>,
{
ContentVisitor::new()
.visit_seq(visitor)
.map(TagOrContent::Content)
}
fn visit_map<V>(self, visitor: V) -> Result<Self::Value, V::Error>
where
V: MapAccess<'de>,
{
ContentVisitor::new()
.visit_map(visitor)
.map(TagOrContent::Content)
}
fn visit_enum<V>(self, visitor: V) -> Result<Self::Value, V::Error>
where
V: EnumAccess<'de>,
{
ContentVisitor::new()
.visit_enum(visitor)
.map(TagOrContent::Content)
}
}
/// Used by generated code to deserialize an internally tagged enum.
///
/// Not public API.
pub struct TaggedContent<'de, T> {
pub tag: T,
pub content: Content<'de>,
}
/// Not public API.
pub struct TaggedContentVisitor<'de, T> {
tag_name: &'static str,
value: PhantomData<TaggedContent<'de, T>>,
}
impl<'de, T> TaggedContentVisitor<'de, T> {
/// Visitor for the content of an internally tagged enum with the given
/// tag name.
pub fn new(name: &'static str) -> Self {
TaggedContentVisitor {
tag_name: name,
value: PhantomData,
}
}
}
impl<'de, T> DeserializeSeed<'de> for TaggedContentVisitor<'de, T>
where
T: Deserialize<'de>,
{
type Value = TaggedContent<'de, T>;
fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
// Internally tagged enums are only supported in self-describing
// formats.
deserializer.deserialize_any(self)
}
}
impl<'de, T> Visitor<'de> for TaggedContentVisitor<'de, T>
where
T: Deserialize<'de>,
{
type Value = TaggedContent<'de, T>;
fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.write_str("internally tagged enum")
}
fn visit_seq<S>(self, mut seq: S) -> Result<Self::Value, S::Error>
where
S: SeqAccess<'de>,
{
let tag = match try!(seq.next_element()) {
Some(tag) => tag,
None => {
return Err(de::Error::missing_field(self.tag_name));
}
};
let rest = de::value::SeqAccessDeserializer::new(seq);
Ok(TaggedContent {
tag: tag,
content: try!(Content::deserialize(rest)),
})
}
fn visit_map<M>(self, mut map: M) -> Result<Self::Value, M::Error>
where
M: MapAccess<'de>,
{
let mut tag = None;
let mut vec = Vec::with_capacity(size_hint::cautious(map.size_hint()));
while let Some(k) = try!(map.next_key_seed(TagOrContentVisitor::new(self.tag_name))) {
match k {
TagOrContent::Tag => {
if tag.is_some() {
return Err(de::Error::duplicate_field(self.tag_name));
}
tag = Some(try!(map.next_value()));
}
TagOrContent::Content(k) => {
let v = try!(map.next_value());
vec.push((k, v));
}
}
}
match tag {
None => Err(de::Error::missing_field(self.tag_name)),
Some(tag) => Ok(TaggedContent {
tag: tag,
content: Content::Map(vec),
}),
}
}
}
/// Used by generated code to deserialize an adjacently tagged enum.
///
/// Not public API.
pub enum TagOrContentField {
Tag,
Content,
}
/// Not public API.
pub struct TagOrContentFieldVisitor {
pub tag: &'static str,
pub content: &'static str,
}
impl<'de> DeserializeSeed<'de> for TagOrContentFieldVisitor {
type Value = TagOrContentField;
fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_str(self)
}
}
impl<'de> Visitor<'de> for TagOrContentFieldVisitor {
type Value = TagOrContentField;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(formatter, "{:?} or {:?}", self.tag, self.content)
}
fn visit_str<E>(self, field: &str) -> Result<Self::Value, E>
where
E: de::Error,
{
if field == self.tag {
Ok(TagOrContentField::Tag)
} else if field == self.content {
Ok(TagOrContentField::Content)
} else {
Err(de::Error::invalid_value(Unexpected::Str(field), &self))
}
}
}
/// Used by generated code to deserialize an adjacently tagged enum when
/// ignoring unrelated fields is allowed.
///
/// Not public API.
pub enum TagContentOtherField {
Tag,
Content,
Other,
}
/// Not public API.
pub struct TagContentOtherFieldVisitor {
pub tag: &'static str,
pub content: &'static str,
}
impl<'de> DeserializeSeed<'de> for TagContentOtherFieldVisitor {
type Value = TagContentOtherField;
fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_str(self)
}
}
impl<'de> Visitor<'de> for TagContentOtherFieldVisitor {
type Value = TagContentOtherField;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(
formatter,
"{:?}, {:?}, or other ignored fields",
self.tag, self.content
)
}
fn visit_str<E>(self, field: &str) -> Result<Self::Value, E>
where
E: de::Error,
{
if field == self.tag {
Ok(TagContentOtherField::Tag)
} else if field == self.content {
Ok(TagContentOtherField::Content)
} else {
Ok(TagContentOtherField::Other)
}
}
}
/// Not public API
pub struct ContentDeserializer<'de, E> {
content: Content<'de>,
err: PhantomData<E>,
}
impl<'de, E> ContentDeserializer<'de, E>
where
E: de::Error,
{
#[cold]
fn invalid_type(self, exp: &Expected) -> E {
de::Error::invalid_type(self.content.unexpected(), exp)
}
fn deserialize_integer<V>(self, visitor: V) -> Result<V::Value, E>
where
V: Visitor<'de>,
{
match self.content {
Content::U8(v) => visitor.visit_u8(v),
Content::U16(v) => visitor.visit_u16(v),
Content::U32(v) => visitor.visit_u32(v),
Content::U64(v) => visitor.visit_u64(v),
Content::I8(v) => visitor.visit_i8(v),
Content::I16(v) => visitor.visit_i16(v),
Content::I32(v) => visitor.visit_i32(v),
Content::I64(v) => visitor.visit_i64(v),
_ => Err(self.invalid_type(&visitor)),
}
}
}
fn visit_content_seq<'de, V, E>(content: Vec<Content<'de>>, visitor: V) -> Result<V::Value, E>
where
V: Visitor<'de>,
E: de::Error,
{
let seq = content.into_iter().map(ContentDeserializer::new);
let mut seq_visitor = de::value::SeqDeserializer::new(seq);
let value = try!(visitor.visit_seq(&mut seq_visitor));
try!(seq_visitor.end());
Ok(value)
}
fn visit_content_map<'de, V, E>(
content: Vec<(Content<'de>, Content<'de>)>,
visitor: V,
) -> Result<V::Value, E>
where
V: Visitor<'de>,
E: de::Error,
{
let map = content
.into_iter()
.map(|(k, v)| (ContentDeserializer::new(k), ContentDeserializer::new(v)));
let mut map_visitor = de::value::MapDeserializer::new(map);
let value = try!(visitor.visit_map(&mut map_visitor));
try!(map_visitor.end());
Ok(value)
}
/// Used when deserializing an internally tagged enum because the content
/// will be used exactly once.
impl<'de, E> Deserializer<'de> for ContentDeserializer<'de, E>
where
E: de::Error,
{
type Error = E;
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::Bool(v) => visitor.visit_bool(v),
Content::U8(v) => visitor.visit_u8(v),
Content::U16(v) => visitor.visit_u16(v),
Content::U32(v) => visitor.visit_u32(v),
Content::U64(v) => visitor.visit_u64(v),
Content::I8(v) => visitor.visit_i8(v),
Content::I16(v) => visitor.visit_i16(v),
Content::I32(v) => visitor.visit_i32(v),
Content::I64(v) => visitor.visit_i64(v),
Content::F32(v) => visitor.visit_f32(v),
Content::F64(v) => visitor.visit_f64(v),
Content::Char(v) => visitor.visit_char(v),
Content::String(v) => visitor.visit_string(v),
Content::Str(v) => visitor.visit_borrowed_str(v),
Content::ByteBuf(v) => visitor.visit_byte_buf(v),
Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
Content::Unit => visitor.visit_unit(),
Content::None => visitor.visit_none(),
Content::Some(v) => visitor.visit_some(ContentDeserializer::new(*v)),
Content::Newtype(v) => visitor.visit_newtype_struct(ContentDeserializer::new(*v)),
Content::Seq(v) => visit_content_seq(v, visitor),
Content::Map(v) => visit_content_map(v, visitor),
}
}
fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::Bool(v) => visitor.visit_bool(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::F32(v) => visitor.visit_f32(v),
Content::F64(v) => visitor.visit_f64(v),
Content::U64(v) => visitor.visit_u64(v),
Content::I64(v) => visitor.visit_i64(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::F64(v) => visitor.visit_f64(v),
Content::U64(v) => visitor.visit_u64(v),
Content::I64(v) => visitor.visit_i64(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::Char(v) => visitor.visit_char(v),
Content::String(v) => visitor.visit_string(v),
Content::Str(v) => visitor.visit_borrowed_str(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_string(visitor)
}
fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::String(v) => visitor.visit_string(v),
Content::Str(v) => visitor.visit_borrowed_str(v),
Content::ByteBuf(v) => visitor.visit_byte_buf(v),
Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_byte_buf(visitor)
}
fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::String(v) => visitor.visit_string(v),
Content::Str(v) => visitor.visit_borrowed_str(v),
Content::ByteBuf(v) => visitor.visit_byte_buf(v),
Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
Content::Seq(v) => visit_content_seq(v, visitor),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::None => visitor.visit_none(),
Content::Some(v) => visitor.visit_some(ContentDeserializer::new(*v)),
Content::Unit => visitor.visit_unit(),
_ => visitor.visit_some(self),
}
}
fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::Unit => visitor.visit_unit(),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_unit_struct<V>(
self,
_name: &'static str,
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
// As a special case, allow deserializing untagged newtype
// variant containing unit struct.
//
// #[derive(Deserialize)]
// struct Info;
//
// #[derive(Deserialize)]
// #[serde(tag = "topic")]
// enum Message {
// Info(Info),
// }
//
// We want {"topic":"Info"} to deserialize even though
// ordinarily unit structs do not deserialize from empty map.
Content::Map(ref v) if v.is_empty() => visitor.visit_unit(),
_ => self.deserialize_any(visitor),
}
}
fn deserialize_newtype_struct<V>(
self,
_name: &str,
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::Newtype(v) => visitor.visit_newtype_struct(ContentDeserializer::new(*v)),
_ => visitor.visit_newtype_struct(self),
}
}
fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::Seq(v) => visit_content_seq(v, visitor),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::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, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_seq(visitor)
}
fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::Map(v) => visit_content_map(v, visitor),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_struct<V>(
self,
_name: &'static str,
_fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::Seq(v) => visit_content_seq(v, visitor),
Content::Map(v) => visit_content_map(v, visitor),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_enum<V>(
self,
_name: &str,
_variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
let (variant, value) = match self.content {
Content::Map(value) => {
let mut iter = value.into_iter();
let (variant, value) = match iter.next() {
Some(v) => v,
None => {
return Err(de::Error::invalid_value(
de::Unexpected::Map,
&"map with a single key",
));
}
};
// enums are encoded in json as maps with a single key:value pair
if iter.next().is_some() {
return Err(de::Error::invalid_value(
de::Unexpected::Map,
&"map with a single key",
));
}
(variant, Some(value))
}
s @ Content::String(_) | s @ Content::Str(_) => (s, None),
other => {
return Err(de::Error::invalid_type(
other.unexpected(),
&"string or map",
));
}
};
visitor.visit_enum(EnumDeserializer::new(variant, value))
}
fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match self.content {
Content::String(v) => visitor.visit_string(v),
Content::Str(v) => visitor.visit_borrowed_str(v),
Content::ByteBuf(v) => visitor.visit_byte_buf(v),
Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
Content::U8(v) => visitor.visit_u8(v),
Content::U64(v) => visitor.visit_u64(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
drop(self);
visitor.visit_unit()
}
}
impl<'de, E> ContentDeserializer<'de, E> {
/// private API, don't use
pub fn new(content: Content<'de>) -> Self {
ContentDeserializer {
content: content,
err: PhantomData,
}
}
}
pub struct EnumDeserializer<'de, E>
where
E: de::Error,
{
variant: Content<'de>,
value: Option<Content<'de>>,
err: PhantomData<E>,
}
impl<'de, E> EnumDeserializer<'de, E>
where
E: de::Error,
{
pub fn new(variant: Content<'de>, value: Option<Content<'de>>) -> EnumDeserializer<'de, E> {
EnumDeserializer {
variant: variant,
value: value,
err: PhantomData,
}
}
}
impl<'de, E> de::EnumAccess<'de> for EnumDeserializer<'de, E>
where
E: de::Error,
{
type Error = E;
type Variant = VariantDeserializer<'de, Self::Error>;
fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), E>
where
V: de::DeserializeSeed<'de>,
{
let visitor = VariantDeserializer {
value: self.value,
err: PhantomData,
};
seed.deserialize(ContentDeserializer::new(self.variant))
.map(|v| (v, visitor))
}
}
pub struct VariantDeserializer<'de, E>
where
E: de::Error,
{
value: Option<Content<'de>>,
err: PhantomData<E>,
}
impl<'de, E> de::VariantAccess<'de> for VariantDeserializer<'de, E>
where
E: de::Error,
{
type Error = E;
fn unit_variant(self) -> Result<(), E> {
match self.value {
Some(value) => de::Deserialize::deserialize(ContentDeserializer::new(value)),
None => Ok(()),
}
}
fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, E>
where
T: de::DeserializeSeed<'de>,
{
match self.value {
Some(value) => seed.deserialize(ContentDeserializer::new(value)),
None => Err(de::Error::invalid_type(
de::Unexpected::UnitVariant,
&"newtype variant",
)),
}
}
fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error>
where
V: de::Visitor<'de>,
{
match self.value {
Some(Content::Seq(v)) => {
de::Deserializer::deserialize_any(SeqDeserializer::new(v), visitor)
}
Some(other) => Err(de::Error::invalid_type(
other.unexpected(),
&"tuple variant",
)),
None => Err(de::Error::invalid_type(
de::Unexpected::UnitVariant,
&"tuple variant",
)),
}
}
fn struct_variant<V>(
self,
_fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: de::Visitor<'de>,
{
match self.value {
Some(Content::Map(v)) => {
de::Deserializer::deserialize_any(MapDeserializer::new(v), visitor)
}
Some(Content::Seq(v)) => {
de::Deserializer::deserialize_any(SeqDeserializer::new(v), visitor)
}
Some(other) => Err(de::Error::invalid_type(
other.unexpected(),
&"struct variant",
)),
_ => Err(de::Error::invalid_type(
de::Unexpected::UnitVariant,
&"struct variant",
)),
}
}
}
struct SeqDeserializer<'de, E>
where
E: de::Error,
{
iter: <Vec<Content<'de>> as IntoIterator>::IntoIter,
err: PhantomData<E>,
}
impl<'de, E> SeqDeserializer<'de, E>
where
E: de::Error,
{
fn new(vec: Vec<Content<'de>>) -> Self {
SeqDeserializer {
iter: vec.into_iter(),
err: PhantomData,
}
}
}
impl<'de, E> de::Deserializer<'de> for SeqDeserializer<'de, E>
where
E: de::Error,
{
type Error = E;
#[inline]
fn deserialize_any<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: de::Visitor<'de>,
{
let len = self.iter.len();
if len == 0 {
visitor.visit_unit()
} else {
let ret = try!(visitor.visit_seq(&mut self));
let remaining = self.iter.len();
if remaining == 0 {
Ok(ret)
} else {
Err(de::Error::invalid_length(len, &"fewer elements in array"))
}
}
}
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 newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any
}
}
impl<'de, E> de::SeqAccess<'de> for SeqDeserializer<'de, E>
where
E: de::Error,
{
type Error = E;
fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
where
T: de::DeserializeSeed<'de>,
{
match self.iter.next() {
Some(value) => seed.deserialize(ContentDeserializer::new(value)).map(Some),
None => Ok(None),
}
}
fn size_hint(&self) -> Option<usize> {
size_hint::from_bounds(&self.iter)
}
}
struct MapDeserializer<'de, E>
where
E: de::Error,
{
iter: <Vec<(Content<'de>, Content<'de>)> as IntoIterator>::IntoIter,
value: Option<Content<'de>>,
err: PhantomData<E>,
}
impl<'de, E> MapDeserializer<'de, E>
where
E: de::Error,
{
fn new(map: Vec<(Content<'de>, Content<'de>)>) -> Self {
MapDeserializer {
iter: map.into_iter(),
value: None,
err: PhantomData,
}
}
}
impl<'de, E> de::MapAccess<'de> for MapDeserializer<'de, E>
where
E: de::Error,
{
type Error = E;
fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
where
T: de::DeserializeSeed<'de>,
{
match self.iter.next() {
Some((key, value)) => {
self.value = Some(value);
seed.deserialize(ContentDeserializer::new(key)).map(Some)
}
None => Ok(None),
}
}
fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error>
where
T: de::DeserializeSeed<'de>,
{
match self.value.take() {
Some(value) => seed.deserialize(ContentDeserializer::new(value)),
None => Err(de::Error::custom("value is missing")),
}
}
fn size_hint(&self) -> Option<usize> {
size_hint::from_bounds(&self.iter)
}
}
impl<'de, E> de::Deserializer<'de> for MapDeserializer<'de, E>
where
E: de::Error,
{
type Error = E;
#[inline]
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: de::Visitor<'de>,
{
visitor.visit_map(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 newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any
}
}
/// Not public API.
pub struct ContentRefDeserializer<'a, 'de: 'a, E> {
content: &'a Content<'de>,
err: PhantomData<E>,
}
impl<'a, 'de, E> ContentRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
#[cold]
fn invalid_type(self, exp: &Expected) -> E {
de::Error::invalid_type(self.content.unexpected(), exp)
}
fn deserialize_integer<V>(self, visitor: V) -> Result<V::Value, E>
where
V: Visitor<'de>,
{
match *self.content {
Content::U8(v) => visitor.visit_u8(v),
Content::U16(v) => visitor.visit_u16(v),
Content::U32(v) => visitor.visit_u32(v),
Content::U64(v) => visitor.visit_u64(v),
Content::I8(v) => visitor.visit_i8(v),
Content::I16(v) => visitor.visit_i16(v),
Content::I32(v) => visitor.visit_i32(v),
Content::I64(v) => visitor.visit_i64(v),
_ => Err(self.invalid_type(&visitor)),
}
}
}
fn visit_content_seq_ref<'a, 'de, V, E>(
content: &'a [Content<'de>],
visitor: V,
) -> Result<V::Value, E>
where
V: Visitor<'de>,
E: de::Error,
{
let seq = content.iter().map(ContentRefDeserializer::new);
let mut seq_visitor = de::value::SeqDeserializer::new(seq);
let value = try!(visitor.visit_seq(&mut seq_visitor));
try!(seq_visitor.end());
Ok(value)
}
fn visit_content_map_ref<'a, 'de, V, E>(
content: &'a [(Content<'de>, Content<'de>)],
visitor: V,
) -> Result<V::Value, E>
where
V: Visitor<'de>,
E: de::Error,
{
let map = content.iter().map(|&(ref k, ref v)| {
(
ContentRefDeserializer::new(k),
ContentRefDeserializer::new(v),
)
});
let mut map_visitor = de::value::MapDeserializer::new(map);
let value = try!(visitor.visit_map(&mut map_visitor));
try!(map_visitor.end());
Ok(value)
}
/// Used when deserializing an untagged enum because the content may need
/// to be used more than once.
impl<'de, 'a, E> Deserializer<'de> for ContentRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
type Error = E;
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, E>
where
V: Visitor<'de>,
{
match *self.content {
Content::Bool(v) => visitor.visit_bool(v),
Content::U8(v) => visitor.visit_u8(v),
Content::U16(v) => visitor.visit_u16(v),
Content::U32(v) => visitor.visit_u32(v),
Content::U64(v) => visitor.visit_u64(v),
Content::I8(v) => visitor.visit_i8(v),
Content::I16(v) => visitor.visit_i16(v),
Content::I32(v) => visitor.visit_i32(v),
Content::I64(v) => visitor.visit_i64(v),
Content::F32(v) => visitor.visit_f32(v),
Content::F64(v) => visitor.visit_f64(v),
Content::Char(v) => visitor.visit_char(v),
Content::String(ref v) => visitor.visit_str(v),
Content::Str(v) => visitor.visit_borrowed_str(v),
Content::ByteBuf(ref v) => visitor.visit_bytes(v),
Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
Content::Unit => visitor.visit_unit(),
Content::None => visitor.visit_none(),
Content::Some(ref v) => visitor.visit_some(ContentRefDeserializer::new(v)),
Content::Newtype(ref v) => {
visitor.visit_newtype_struct(ContentRefDeserializer::new(v))
}
Content::Seq(ref v) => visit_content_seq_ref(v, visitor),
Content::Map(ref v) => visit_content_map_ref(v, visitor),
}
}
fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::Bool(v) => visitor.visit_bool(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_integer(visitor)
}
fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::F32(v) => visitor.visit_f32(v),
Content::F64(v) => visitor.visit_f64(v),
Content::U64(v) => visitor.visit_u64(v),
Content::I64(v) => visitor.visit_i64(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::F64(v) => visitor.visit_f64(v),
Content::U64(v) => visitor.visit_u64(v),
Content::I64(v) => visitor.visit_i64(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::Char(v) => visitor.visit_char(v),
Content::String(ref v) => visitor.visit_str(v),
Content::Str(v) => visitor.visit_borrowed_str(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::String(ref v) => visitor.visit_str(v),
Content::Str(v) => visitor.visit_borrowed_str(v),
Content::ByteBuf(ref v) => visitor.visit_bytes(v),
Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_str(visitor)
}
fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::String(ref v) => visitor.visit_str(v),
Content::Str(v) => visitor.visit_borrowed_str(v),
Content::ByteBuf(ref v) => visitor.visit_bytes(v),
Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
Content::Seq(ref v) => visit_content_seq_ref(v, visitor),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_bytes(visitor)
}
fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, E>
where
V: Visitor<'de>,
{
match *self.content {
Content::None => visitor.visit_none(),
Content::Some(ref v) => visitor.visit_some(ContentRefDeserializer::new(v)),
Content::Unit => visitor.visit_unit(),
_ => visitor.visit_some(self),
}
}
fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::Unit => visitor.visit_unit(),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_unit_struct<V>(
self,
_name: &'static str,
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_unit(visitor)
}
fn deserialize_newtype_struct<V>(self, _name: &str, visitor: V) -> Result<V::Value, E>
where
V: Visitor<'de>,
{
match *self.content {
Content::Newtype(ref v) => {
visitor.visit_newtype_struct(ContentRefDeserializer::new(v))
}
_ => visitor.visit_newtype_struct(self),
}
}
fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::Seq(ref v) => visit_content_seq_ref(v, visitor),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::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, Self::Error>
where
V: Visitor<'de>,
{
self.deserialize_seq(visitor)
}
fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::Map(ref v) => visit_content_map_ref(v, visitor),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_struct<V>(
self,
_name: &'static str,
_fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::Seq(ref v) => visit_content_seq_ref(v, visitor),
Content::Map(ref v) => visit_content_map_ref(v, visitor),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_enum<V>(
self,
_name: &str,
_variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
let (variant, value) = match *self.content {
Content::Map(ref value) => {
let mut iter = value.iter();
let &(ref variant, ref value) = match iter.next() {
Some(v) => v,
None => {
return Err(de::Error::invalid_value(
de::Unexpected::Map,
&"map with a single key",
));
}
};
// enums are encoded in json as maps with a single key:value pair
if iter.next().is_some() {
return Err(de::Error::invalid_value(
de::Unexpected::Map,
&"map with a single key",
));
}
(variant, Some(value))
}
ref s @ Content::String(_) | ref s @ Content::Str(_) => (s, None),
ref other => {
return Err(de::Error::invalid_type(
other.unexpected(),
&"string or map",
));
}
};
visitor.visit_enum(EnumRefDeserializer {
variant: variant,
value: value,
err: PhantomData,
})
}
fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match *self.content {
Content::String(ref v) => visitor.visit_str(v),
Content::Str(v) => visitor.visit_borrowed_str(v),
Content::ByteBuf(ref v) => visitor.visit_bytes(v),
Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
Content::U8(v) => visitor.visit_u8(v),
Content::U64(v) => visitor.visit_u64(v),
_ => Err(self.invalid_type(&visitor)),
}
}
fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_unit()
}
}
impl<'a, 'de, E> ContentRefDeserializer<'a, 'de, E> {
/// private API, don't use
pub fn new(content: &'a Content<'de>) -> Self {
ContentRefDeserializer {
content: content,
err: PhantomData,
}
}
}
struct EnumRefDeserializer<'a, 'de: 'a, E>
where
E: de::Error,
{
variant: &'a Content<'de>,
value: Option<&'a Content<'de>>,
err: PhantomData<E>,
}
impl<'de, 'a, E> de::EnumAccess<'de> for EnumRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
type Error = E;
type Variant = VariantRefDeserializer<'a, 'de, Self::Error>;
fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), Self::Error>
where
V: de::DeserializeSeed<'de>,
{
let visitor = VariantRefDeserializer {
value: self.value,
err: PhantomData,
};
seed.deserialize(ContentRefDeserializer::new(self.variant))
.map(|v| (v, visitor))
}
}
struct VariantRefDeserializer<'a, 'de: 'a, E>
where
E: de::Error,
{
value: Option<&'a Content<'de>>,
err: PhantomData<E>,
}
impl<'de, 'a, E> de::VariantAccess<'de> for VariantRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
type Error = E;
fn unit_variant(self) -> Result<(), E> {
match self.value {
Some(value) => de::Deserialize::deserialize(ContentRefDeserializer::new(value)),
None => Ok(()),
}
}
fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, E>
where
T: de::DeserializeSeed<'de>,
{
match self.value {
Some(value) => seed.deserialize(ContentRefDeserializer::new(value)),
None => Err(de::Error::invalid_type(
de::Unexpected::UnitVariant,
&"newtype variant",
)),
}
}
fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error>
where
V: de::Visitor<'de>,
{
match self.value {
Some(&Content::Seq(ref v)) => {
de::Deserializer::deserialize_any(SeqRefDeserializer::new(v), visitor)
}
Some(other) => Err(de::Error::invalid_type(
other.unexpected(),
&"tuple variant",
)),
None => Err(de::Error::invalid_type(
de::Unexpected::UnitVariant,
&"tuple variant",
)),
}
}
fn struct_variant<V>(
self,
_fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: de::Visitor<'de>,
{
match self.value {
Some(&Content::Map(ref v)) => {
de::Deserializer::deserialize_any(MapRefDeserializer::new(v), visitor)
}
Some(&Content::Seq(ref v)) => {
de::Deserializer::deserialize_any(SeqRefDeserializer::new(v), visitor)
}
Some(other) => Err(de::Error::invalid_type(
other.unexpected(),
&"struct variant",
)),
_ => Err(de::Error::invalid_type(
de::Unexpected::UnitVariant,
&"struct variant",
)),
}
}
}
struct SeqRefDeserializer<'a, 'de: 'a, E>
where
E: de::Error,
{
iter: <&'a [Content<'de>] as IntoIterator>::IntoIter,
err: PhantomData<E>,
}
impl<'a, 'de, E> SeqRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
fn new(slice: &'a [Content<'de>]) -> Self {
SeqRefDeserializer {
iter: slice.iter(),
err: PhantomData,
}
}
}
impl<'de, 'a, E> de::Deserializer<'de> for SeqRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
type Error = E;
#[inline]
fn deserialize_any<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: de::Visitor<'de>,
{
let len = self.iter.len();
if len == 0 {
visitor.visit_unit()
} else {
let ret = try!(visitor.visit_seq(&mut self));
let remaining = self.iter.len();
if remaining == 0 {
Ok(ret)
} else {
Err(de::Error::invalid_length(len, &"fewer elements in array"))
}
}
}
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 newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any
}
}
impl<'de, 'a, E> de::SeqAccess<'de> for SeqRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
type Error = E;
fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
where
T: de::DeserializeSeed<'de>,
{
match self.iter.next() {
Some(value) => seed
.deserialize(ContentRefDeserializer::new(value))
.map(Some),
None => Ok(None),
}
}
fn size_hint(&self) -> Option<usize> {
size_hint::from_bounds(&self.iter)
}
}
struct MapRefDeserializer<'a, 'de: 'a, E>
where
E: de::Error,
{
iter: <&'a [(Content<'de>, Content<'de>)] as IntoIterator>::IntoIter,
value: Option<&'a Content<'de>>,
err: PhantomData<E>,
}
impl<'a, 'de, E> MapRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
fn new(map: &'a [(Content<'de>, Content<'de>)]) -> Self {
MapRefDeserializer {
iter: map.iter(),
value: None,
err: PhantomData,
}
}
}
impl<'de, 'a, E> de::MapAccess<'de> for MapRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
type Error = E;
fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
where
T: de::DeserializeSeed<'de>,
{
match self.iter.next() {
Some(&(ref key, ref value)) => {
self.value = Some(value);
seed.deserialize(ContentRefDeserializer::new(key)).map(Some)
}
None => Ok(None),
}
}
fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error>
where
T: de::DeserializeSeed<'de>,
{
match self.value.take() {
Some(value) => seed.deserialize(ContentRefDeserializer::new(value)),
None => Err(de::Error::custom("value is missing")),
}
}
fn size_hint(&self) -> Option<usize> {
size_hint::from_bounds(&self.iter)
}
}
impl<'de, 'a, E> de::Deserializer<'de> for MapRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
type Error = E;
#[inline]
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: de::Visitor<'de>,
{
visitor.visit_map(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 newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any
}
}
impl<'de, E> de::IntoDeserializer<'de, E> for ContentDeserializer<'de, E>
where
E: de::Error,
{
type Deserializer = Self;
fn into_deserializer(self) -> Self {
self
}
}
impl<'de, 'a, E> de::IntoDeserializer<'de, E> for ContentRefDeserializer<'a, 'de, E>
where
E: de::Error,
{
type Deserializer = Self;
fn into_deserializer(self) -> Self {
self
}
}
/// Visitor for deserializing an internally tagged unit variant.
///
/// Not public API.
pub struct InternallyTaggedUnitVisitor<'a> {
type_name: &'a str,
variant_name: &'a str,
}
impl<'a> InternallyTaggedUnitVisitor<'a> {
/// Not public API.
pub fn new(type_name: &'a str, variant_name: &'a str) -> Self {
InternallyTaggedUnitVisitor {
type_name: type_name,
variant_name: variant_name,
}
}
}
impl<'de, 'a> Visitor<'de> for InternallyTaggedUnitVisitor<'a> {
type Value = ();
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(
formatter,
"unit variant {}::{}",
self.type_name, self.variant_name
)
}
fn visit_seq<S>(self, _: S) -> Result<(), S::Error>
where
S: SeqAccess<'de>,
{
Ok(())
}
fn visit_map<M>(self, mut access: M) -> Result<(), M::Error>
where
M: MapAccess<'de>,
{
while let Some(_) = try!(access.next_entry::<IgnoredAny, IgnoredAny>()) {}
Ok(())
}
}
/// Visitor for deserializing an untagged unit variant.
///
/// Not public API.
pub struct UntaggedUnitVisitor<'a> {
type_name: &'a str,
variant_name: &'a str,
}
impl<'a> UntaggedUnitVisitor<'a> {
/// Not public API.
pub fn new(type_name: &'a str, variant_name: &'a str) -> Self {
UntaggedUnitVisitor {
type_name: type_name,
variant_name: variant_name,
}
}
}
impl<'de, 'a> Visitor<'de> for UntaggedUnitVisitor<'a> {
type Value = ();
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(
formatter,
"unit variant {}::{}",
self.type_name, self.variant_name
)
}
fn visit_unit<E>(self) -> Result<(), E>
where
E: de::Error,
{
Ok(())
}
}
}
////////////////////////////////////////////////////////////////////////////////
// Like `IntoDeserializer` but also implemented for `&[u8]`. This is used for
// the newtype fallthrough case of `field_identifier`.
//
// #[derive(Deserialize)]
// #[serde(field_identifier)]
// enum F {
// A,
// B,
// Other(String), // deserialized using IdentifierDeserializer
// }
pub trait IdentifierDeserializer<'de, E: Error> {
type Deserializer: Deserializer<'de, Error = E>;
fn from(self) -> Self::Deserializer;
}
impl<'de, E> IdentifierDeserializer<'de, E> for u32
where
E: Error,
{
type Deserializer = <u32 as IntoDeserializer<'de, E>>::Deserializer;
fn from(self) -> Self::Deserializer {
self.into_deserializer()
}
}
pub struct StrDeserializer<'a, E> {
value: &'a str,
marker: PhantomData<E>,
}
impl<'a, E> IdentifierDeserializer<'a, E> for &'a str
where
E: Error,
{
type Deserializer = StrDeserializer<'a, E>;
fn from(self) -> Self::Deserializer {
StrDeserializer {
value: self,
marker: PhantomData,
}
}
}
impl<'de, 'a, E> Deserializer<'de> for StrDeserializer<'a, E>
where
E: Error,
{
type Error = E;
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_str(self.value)
}
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 newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any
}
}
pub struct BytesDeserializer<'a, E> {
value: &'a [u8],
marker: PhantomData<E>,
}
impl<'a, E> IdentifierDeserializer<'a, E> for &'a [u8]
where
E: Error,
{
type Deserializer = BytesDeserializer<'a, E>;
fn from(self) -> Self::Deserializer {
BytesDeserializer {
value: self,
marker: PhantomData,
}
}
}
impl<'de, 'a, E> Deserializer<'de> for BytesDeserializer<'a, E>
where
E: Error,
{
type Error = E;
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_bytes(self.value)
}
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 newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any
}
}
/// A DeserializeSeed helper for implementing deserialize_in_place Visitors.
///
/// Wraps a mutable reference and calls deserialize_in_place on it.
pub struct InPlaceSeed<'a, T: 'a>(pub &'a mut T);
impl<'a, 'de, T> DeserializeSeed<'de> for InPlaceSeed<'a, T>
where
T: Deserialize<'de>,
{
type Value = ();
fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
T::deserialize_in_place(deserializer, self.0)
}
}
#[cfg(any(feature = "std", feature = "alloc"))]
pub struct FlatMapDeserializer<'a, 'de: 'a, E>(
pub &'a mut Vec<Option<(Content<'de>, Content<'de>)>>,
pub PhantomData<E>,
);
#[cfg(any(feature = "std", feature = "alloc"))]
impl<'a, 'de, E> FlatMapDeserializer<'a, 'de, E>
where
E: Error,
{
fn deserialize_other<V>() -> Result<V, E> {
Err(Error::custom("can only flatten structs and maps"))
}
}
#[cfg(any(feature = "std", feature = "alloc"))]
macro_rules! forward_to_deserialize_other {
($($func:ident ( $($arg:ty),* ))*) => {
$(
fn $func<V>(self, $(_: $arg,)* _visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
Self::deserialize_other()
}
)*
}
}
#[cfg(any(feature = "std", feature = "alloc"))]
impl<'a, 'de, E> Deserializer<'de> for FlatMapDeserializer<'a, 'de, E>
where
E: Error,
{
type Error = E;
fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_map(FlatInternallyTaggedAccess {
iter: self.0.iter_mut(),
pending: None,
_marker: PhantomData,
})
}
fn deserialize_enum<V>(
self,
name: &'static str,
variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
for item in self.0.iter_mut() {
// items in the vector are nulled out when used. So we can only use
// an item if it's still filled in and if the field is one we care
// about.
let use_item = match *item {
None => false,
Some((ref c, _)) => c.as_str().map_or(false, |x| variants.contains(&x)),
};
if use_item {
let (key, value) = item.take().unwrap();
return visitor.visit_enum(EnumDeserializer::new(key, Some(value)));
}
}
Err(Error::custom(format_args!(
"no variant of enum {} found in flattened data",
name
)))
}
fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_map(FlatMapAccess::new(self.0.iter()))
}
fn deserialize_struct<V>(
self,
_: &'static str,
fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_map(FlatStructAccess::new(self.0.iter_mut(), fields))
}
fn deserialize_newtype_struct<V>(self, _name: &str, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_newtype_struct(self)
}
fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
match visitor.__private_visit_untagged_option(self) {
Ok(value) => Ok(value),
Err(()) => Self::deserialize_other(),
}
}
forward_to_deserialize_other! {
deserialize_bool()
deserialize_i8()
deserialize_i16()
deserialize_i32()
deserialize_i64()
deserialize_u8()
deserialize_u16()
deserialize_u32()
deserialize_u64()
deserialize_f32()
deserialize_f64()
deserialize_char()
deserialize_str()
deserialize_string()
deserialize_bytes()
deserialize_byte_buf()
deserialize_unit()
deserialize_unit_struct(&'static str)
deserialize_seq()
deserialize_tuple(usize)
deserialize_tuple_struct(&'static str, usize)
deserialize_identifier()
deserialize_ignored_any()
}
}
#[cfg(any(feature = "std", feature = "alloc"))]
pub struct FlatMapAccess<'a, 'de: 'a, E> {
iter: slice::Iter<'a, Option<(Content<'de>, Content<'de>)>>,
pending_content: Option<&'a Content<'de>>,
_marker: PhantomData<E>,
}
#[cfg(any(feature = "std", feature = "alloc"))]
impl<'a, 'de, E> FlatMapAccess<'a, 'de, E> {
fn new(
iter: slice::Iter<'a, Option<(Content<'de>, Content<'de>)>>,
) -> FlatMapAccess<'a, 'de, E> {
FlatMapAccess {
iter: iter,
pending_content: None,
_marker: PhantomData,
}
}
}
#[cfg(any(feature = "std", feature = "alloc"))]
impl<'a, 'de, E> MapAccess<'de> for FlatMapAccess<'a, 'de, E>
where
E: Error,
{
type Error = E;
fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
where
T: DeserializeSeed<'de>,
{
while let Some(item) = self.iter.next() {
// Items in the vector are nulled out when used by a struct.
if let Some((ref key, ref content)) = *item {
self.pending_content = Some(content);
return seed.deserialize(ContentRefDeserializer::new(key)).map(Some);
}
}
Ok(None)
}
fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error>
where
T: DeserializeSeed<'de>,
{
match self.pending_content.take() {
Some(value) => seed.deserialize(ContentRefDeserializer::new(value)),
None => Err(Error::custom("value is missing")),
}
}
}
#[cfg(any(feature = "std", feature = "alloc"))]
pub struct FlatStructAccess<'a, 'de: 'a, E> {
iter: slice::IterMut<'a, Option<(Content<'de>, Content<'de>)>>,
pending_content: Option<Content<'de>>,
fields: &'static [&'static str],
_marker: PhantomData<E>,
}
#[cfg(any(feature = "std", feature = "alloc"))]
impl<'a, 'de, E> FlatStructAccess<'a, 'de, E> {
fn new(
iter: slice::IterMut<'a, Option<(Content<'de>, Content<'de>)>>,
fields: &'static [&'static str],
) -> FlatStructAccess<'a, 'de, E> {
FlatStructAccess {
iter: iter,
pending_content: None,
fields: fields,
_marker: PhantomData,
}
}
}
#[cfg(any(feature = "std", feature = "alloc"))]
impl<'a, 'de, E> MapAccess<'de> for FlatStructAccess<'a, 'de, E>
where
E: Error,
{
type Error = E;
fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
where
T: DeserializeSeed<'de>,
{
while let Some(item) = self.iter.next() {
// items in the vector are nulled out when used. So we can only use
// an item if it's still filled in and if the field is one we care
// about. In case we do not know which fields we want, we take them all.
let use_item = match *item {
None => false,
Some((ref c, _)) => c.as_str().map_or(false, |key| self.fields.contains(&key)),
};
if use_item {
let (key, content) = item.take().unwrap();
self.pending_content = Some(content);
return seed.deserialize(ContentDeserializer::new(key)).map(Some);
}
}
Ok(None)
}
fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error>
where
T: DeserializeSeed<'de>,
{
match self.pending_content.take() {
Some(value) => seed.deserialize(ContentDeserializer::new(value)),
None => Err(Error::custom("value is missing")),
}
}
}
#[cfg(any(feature = "std", feature = "alloc"))]
pub struct FlatInternallyTaggedAccess<'a, 'de: 'a, E> {
iter: slice::IterMut<'a, Option<(Content<'de>, Content<'de>)>>,
pending: Option<&'a Content<'de>>,
_marker: PhantomData<E>,
}
#[cfg(any(feature = "std", feature = "alloc"))]
impl<'a, 'de, E> MapAccess<'de> for FlatInternallyTaggedAccess<'a, 'de, E>
where
E: Error,
{
type Error = E;
fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
where
T: DeserializeSeed<'de>,
{
while let Some(item) = self.iter.next() {
if let Some((ref key, ref content)) = *item {
// Do not take(), instead borrow this entry. The internally tagged
// enum does its own buffering so we can't tell whether this entry
// is going to be consumed. Borrowing here leaves the entry
// available for later flattened fields.
self.pending = Some(content);
return seed.deserialize(ContentRefDeserializer::new(key)).map(Some);
}
}
Ok(None)
}
fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error>
where
T: DeserializeSeed<'de>,
{
match self.pending.take() {
Some(value) => seed.deserialize(ContentRefDeserializer::new(value)),
None => panic!("value is missing"),
}
}
}