pub struct Deserializer<'de> { /* private fields */ }
Expand description
The RON deserializer.
If you just want to simply deserialize a value,
you can use the from_str
convenience function.
Implementations§
source§impl<'de> Deserializer<'de>
impl<'de> Deserializer<'de>
sourcepub fn from_str(input: &'de str) -> Result<Deserializer<'de>, SpannedError>
pub fn from_str(input: &'de str) -> Result<Deserializer<'de>, SpannedError>
Examples found in repository?
examples/reflection/reflection.rs (line 94)
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fn setup(type_registry: Res<AppTypeRegistry>) {
let mut value = Foo {
a: 1,
_ignored: NonReflectedValue { _a: 10 },
nested: Bar { b: 8 },
};
// You can set field values like this. The type must match exactly or this will fail.
*value.get_field_mut("a").unwrap() = 2usize;
assert_eq!(value.a, 2);
assert_eq!(*value.get_field::<usize>("a").unwrap(), 2);
// You can also get the &dyn Reflect value of a field like this
let field = value.field("a").unwrap();
// you can downcast Reflect values like this:
assert_eq!(*field.downcast_ref::<usize>().unwrap(), 2);
// DynamicStruct also implements the `Struct` and `Reflect` traits.
let mut patch = DynamicStruct::default();
patch.insert("a", 4usize);
// You can "apply" Reflect implementations on top of other Reflect implementations.
// This will only set fields with the same name, and it will fail if the types don't match.
// You can use this to "patch" your types with new values.
value.apply(&patch);
assert_eq!(value.a, 4);
let type_registry = type_registry.read();
// By default, all derived `Reflect` types can be Serialized using serde. No need to derive
// Serialize!
let serializer = ReflectSerializer::new(&value, &type_registry);
let ron_string =
ron::ser::to_string_pretty(&serializer, ron::ser::PrettyConfig::default()).unwrap();
info!("{}\n", ron_string);
// Dynamic properties can be deserialized
let reflect_deserializer = ReflectDeserializer::new(&type_registry);
let mut deserializer = ron::de::Deserializer::from_str(&ron_string).unwrap();
let reflect_value = reflect_deserializer.deserialize(&mut deserializer).unwrap();
// Deserializing returns a Box<dyn Reflect> value. Generally, deserializing a value will return
// the "dynamic" variant of a type. For example, deserializing a struct will return the
// DynamicStruct type. "Value types" will be deserialized as themselves.
let _deserialized_struct = reflect_value.downcast_ref::<DynamicStruct>();
// Reflect has its own `partial_eq` implementation, named `reflect_partial_eq`. This behaves
// like normal `partial_eq`, but it treats "dynamic" and "non-dynamic" types the same. The
// `Foo` struct and deserialized `DynamicStruct` are considered equal for this reason:
assert!(reflect_value.reflect_partial_eq(&value).unwrap());
// By "patching" `Foo` with the deserialized DynamicStruct, we can "Deserialize" Foo.
// This means we can serialize and deserialize with a single `Reflect` derive!
value.apply(&*reflect_value);
}
More examples
examples/reflection/dynamic_types.rs (line 71)
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fn main() {
#[derive(Reflect, Default)]
#[reflect(Identifiable, Default)]
struct Player {
id: u32,
}
#[reflect_trait]
trait Identifiable {
fn id(&self) -> u32;
}
impl Identifiable for Player {
fn id(&self) -> u32 {
self.id
}
}
// Normally, when instantiating a type, you get back exactly that type.
// This is because the type is known at compile time.
// We call this the "concrete" or "canonical" type.
let player: Player = Player { id: 123 };
// When working with reflected types, however, we often "erase" this type information
// using the `Reflect` trait object.
// The underlying type is still the same (in this case, `Player`),
// but now we've hidden that information from the compiler.
let reflected: Box<dyn Reflect> = Box::new(player);
// Because it's the same type under the hood, we can still downcast it back to the original type.
assert!(reflected.downcast_ref::<Player>().is_some());
// But now let's "clone" our type using `Reflect::clone_value`.
let cloned: Box<dyn Reflect> = reflected.clone_value();
// If we try to downcast back to `Player`, we'll get an error.
assert!(cloned.downcast_ref::<Player>().is_none());
// Why is this?
// Well the reason is that `Reflect::clone_value` actually creates a dynamic type.
// Since `Player` is a struct, we actually get a `DynamicStruct` back.
assert!(cloned.is::<DynamicStruct>());
// This dynamic type is used to represent (or "proxy") the original type,
// so that we can continue to access its fields and overall structure.
let ReflectRef::Struct(cloned_ref) = cloned.reflect_ref() else {
panic!("expected struct")
};
let id = cloned_ref.field("id").unwrap().downcast_ref::<u32>();
assert_eq!(id, Some(&123));
// It also enables us to create a representation of a type without having compile-time
// access to the actual type. This is how the reflection deserializers work.
// They generally can't know how to construct a type ahead of time,
// so they instead build and return these dynamic representations.
let input = "(id: 123)";
let mut registry = TypeRegistry::default();
registry.register::<Player>();
let registration = registry.get(std::any::TypeId::of::<Player>()).unwrap();
let deserialized = TypedReflectDeserializer::new(registration, ®istry)
.deserialize(&mut ron::Deserializer::from_str(input).unwrap())
.unwrap();
// Our deserialized output is a `DynamicStruct` that proxies/represents a `Player`.
assert!(deserialized.downcast_ref::<DynamicStruct>().is_some());
assert!(deserialized.represents::<Player>());
// And while this does allow us to access the fields and structure of the type,
// there may be instances where we need the actual type.
// For example, if we want to convert our `dyn Reflect` into a `dyn Identifiable`,
// we can't use the `DynamicStruct` proxy.
let reflect_identifiable = registration
.data::<ReflectIdentifiable>()
.expect("`ReflectIdentifiable` should be registered");
// This fails since the underlying type of `deserialized` is `DynamicStruct` and not `Player`.
assert!(reflect_identifiable
.get(deserialized.as_reflect())
.is_none());
// So how can we go from a dynamic type to a concrete type?
// There are two ways:
// 1. Using `Reflect::apply`.
{
// If you know the type at compile time, you can construct a new value and apply the dynamic
// value to it.
let mut value = Player::default();
value.apply(deserialized.as_reflect());
assert_eq!(value.id, 123);
// If you don't know the type at compile time, you need a dynamic way of constructing
// an instance of the type. One such way is to use the `ReflectDefault` type data.
let reflect_default = registration
.data::<ReflectDefault>()
.expect("`ReflectDefault` should be registered");
let mut value: Box<dyn Reflect> = reflect_default.default();
value.apply(deserialized.as_reflect());
let identifiable: &dyn Identifiable = reflect_identifiable.get(value.as_reflect()).unwrap();
assert_eq!(identifiable.id(), 123);
}
// 2. Using `FromReflect`
{
// If you know the type at compile time, you can use the `FromReflect` trait to convert the
// dynamic value into the concrete type directly.
let value: Player = Player::from_reflect(deserialized.as_reflect()).unwrap();
assert_eq!(value.id, 123);
// If you don't know the type at compile time, you can use the `ReflectFromReflect` type data
// to perform the conversion dynamically.
let reflect_from_reflect = registration
.data::<ReflectFromReflect>()
.expect("`ReflectFromReflect` should be registered");
let value: Box<dyn Reflect> = reflect_from_reflect
.from_reflect(deserialized.as_reflect())
.unwrap();
let identifiable: &dyn Identifiable = reflect_identifiable.get(value.as_reflect()).unwrap();
assert_eq!(identifiable.id(), 123);
}
// Lastly, while dynamic types are commonly generated via reflection methods like
// `Reflect::clone_value` or via the reflection deserializers,
// you can also construct them manually.
let mut my_dynamic_list = DynamicList::default();
my_dynamic_list.push(1u32);
my_dynamic_list.push(2u32);
my_dynamic_list.push(3u32);
// This is useful when you just need to apply some subset of changes to a type.
let mut my_list: Vec<u32> = Vec::new();
my_list.apply(&my_dynamic_list);
assert_eq!(my_list, vec![1, 2, 3]);
// And if you want it to actually proxy a type, you can configure it to do that as well:
assert!(!my_dynamic_list.as_reflect().represents::<Vec<u32>>());
my_dynamic_list.set_represented_type(Some(<Vec<u32>>::type_info()));
assert!(my_dynamic_list.as_reflect().represents::<Vec<u32>>());
// ============================= REFERENCE ============================= //
// For reference, here are all the available dynamic types:
// 1. `DynamicTuple`
{
let mut dynamic_tuple = DynamicTuple::default();
dynamic_tuple.insert(1u32);
dynamic_tuple.insert(2u32);
dynamic_tuple.insert(3u32);
let mut my_tuple: (u32, u32, u32) = (0, 0, 0);
my_tuple.apply(&dynamic_tuple);
assert_eq!(my_tuple, (1, 2, 3));
}
// 2. `DynamicArray`
{
let dynamic_array = DynamicArray::from_vec(vec![1u32, 2u32, 3u32]);
let mut my_array = [0u32; 3];
my_array.apply(&dynamic_array);
assert_eq!(my_array, [1, 2, 3]);
}
// 3. `DynamicList`
{
let mut dynamic_list = DynamicList::default();
dynamic_list.push(1u32);
dynamic_list.push(2u32);
dynamic_list.push(3u32);
let mut my_list: Vec<u32> = Vec::new();
my_list.apply(&dynamic_list);
assert_eq!(my_list, vec![1, 2, 3]);
}
// 4. `DynamicMap`
{
let mut dynamic_map = DynamicMap::default();
dynamic_map.insert("x", 1u32);
dynamic_map.insert("y", 2u32);
dynamic_map.insert("z", 3u32);
let mut my_map: HashMap<&str, u32> = HashMap::new();
my_map.apply(&dynamic_map);
assert_eq!(my_map.get("x"), Some(&1));
assert_eq!(my_map.get("y"), Some(&2));
assert_eq!(my_map.get("z"), Some(&3));
}
// 5. `DynamicStruct`
{
#[derive(Reflect, Default, Debug, PartialEq)]
struct MyStruct {
x: u32,
y: u32,
z: u32,
}
let mut dynamic_struct = DynamicStruct::default();
dynamic_struct.insert("x", 1u32);
dynamic_struct.insert("y", 2u32);
dynamic_struct.insert("z", 3u32);
let mut my_struct = MyStruct::default();
my_struct.apply(&dynamic_struct);
assert_eq!(my_struct, MyStruct { x: 1, y: 2, z: 3 });
}
// 6. `DynamicTupleStruct`
{
#[derive(Reflect, Default, Debug, PartialEq)]
struct MyTupleStruct(u32, u32, u32);
let mut dynamic_tuple_struct = DynamicTupleStruct::default();
dynamic_tuple_struct.insert(1u32);
dynamic_tuple_struct.insert(2u32);
dynamic_tuple_struct.insert(3u32);
let mut my_tuple_struct = MyTupleStruct::default();
my_tuple_struct.apply(&dynamic_tuple_struct);
assert_eq!(my_tuple_struct, MyTupleStruct(1, 2, 3));
}
// 7. `DynamicEnum`
{
#[derive(Reflect, Default, Debug, PartialEq)]
enum MyEnum {
#[default]
Empty,
Xyz(u32, u32, u32),
}
let mut values = DynamicTuple::default();
values.insert(1u32);
values.insert(2u32);
values.insert(3u32);
let dynamic_variant = DynamicVariant::Tuple(values);
let dynamic_enum = DynamicEnum::new("Xyz", dynamic_variant);
let mut my_enum = MyEnum::default();
my_enum.apply(&dynamic_enum);
assert_eq!(my_enum, MyEnum::Xyz(1, 2, 3));
}
}
pub fn from_bytes(input: &'de [u8]) -> Result<Deserializer<'de>, SpannedError>
pub fn from_str_with_options( input: &'de str, options: Options ) -> Result<Deserializer<'de>, SpannedError>
pub fn from_bytes_with_options( input: &'de [u8], options: Options ) -> Result<Deserializer<'de>, SpannedError>
pub fn remainder(&self) -> Cow<'_, str>
pub fn span_error(&self, code: Error) -> SpannedError
Trait Implementations§
source§impl<'de, 'a> Deserializer<'de> for &'a mut Deserializer<'de>
impl<'de, 'a> Deserializer<'de> for &'a mut Deserializer<'de>
source§fn deserialize_any<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_any<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Require the
Deserializer
to figure out how to drive the visitor based
on what data type is in the input. Read moresource§fn deserialize_bool<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_bool<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a bool
value.source§fn deserialize_i8<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_i8<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting an i8
value.source§fn deserialize_i16<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_i16<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting an i16
value.source§fn deserialize_i32<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_i32<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting an i32
value.source§fn deserialize_i64<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_i64<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting an i64
value.source§fn deserialize_u8<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_u8<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a u8
value.source§fn deserialize_u16<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_u16<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a u16
value.source§fn deserialize_u32<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_u32<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a u32
value.source§fn deserialize_u64<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_u64<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a u64
value.source§fn deserialize_f32<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_f32<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a f32
value.source§fn deserialize_f64<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_f64<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a f64
value.source§fn deserialize_char<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_char<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a char
value.source§fn deserialize_str<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_str<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a string value and does
not benefit from taking ownership of buffered data owned by the
Deserializer
. Read moresource§fn deserialize_string<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_string<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a string value and would
benefit from taking ownership of buffered data owned by the
Deserializer
. Read moresource§fn deserialize_bytes<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_bytes<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a byte array and does not
benefit from taking ownership of buffered data owned by the
Deserializer
. Read moresource§fn deserialize_byte_buf<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_byte_buf<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a byte array and would
benefit from taking ownership of buffered data owned by the
Deserializer
. Read moresource§fn deserialize_option<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_option<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting an optional value. Read moresource§fn deserialize_unit<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_unit<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a unit value.source§fn deserialize_unit_struct<V>(
self,
name: &'static str,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_unit_struct<V>(
self,
name: &'static str,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a unit struct with a
particular name.source§fn deserialize_newtype_struct<V>(
self,
name: &'static str,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_newtype_struct<V>(
self,
name: &'static str,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a newtype struct with a
particular name.source§fn deserialize_seq<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_seq<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a sequence of values.source§fn deserialize_tuple<V>(
self,
_len: usize,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_tuple<V>(
self,
_len: usize,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a sequence of values and
knows how many values there are without looking at the serialized data.source§fn deserialize_tuple_struct<V>(
self,
name: &'static str,
len: usize,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_tuple_struct<V>(
self,
name: &'static str,
len: usize,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a tuple struct with a
particular name and number of fields.source§fn deserialize_map<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_map<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a map of key-value pairs.source§fn deserialize_struct<V>(
self,
name: &'static str,
_fields: &'static [&'static str],
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_struct<V>(
self,
name: &'static str,
_fields: &'static [&'static str],
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting a struct with a particular
name and fields.source§fn deserialize_enum<V>(
self,
name: &'static str,
_variants: &'static [&'static str],
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_enum<V>(
self,
name: &'static str,
_variants: &'static [&'static str],
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting an enum value with a
particular name and possible variants.source§fn deserialize_identifier<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_identifier<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type is expecting the name of a struct
field or the discriminant of an enum variant.source§fn deserialize_ignored_any<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
fn deserialize_ignored_any<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Error>where
V: Visitor<'de>,
Hint that the
Deserialize
type needs to deserialize a value whose type
doesn’t matter because it is ignored. Read moresource§fn deserialize_i128<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Self::Error>where
V: Visitor<'de>,
fn deserialize_i128<V>(
self,
visitor: V
) -> Result<<V as Visitor<'de>>::Value, Self::Error>where
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