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serde.rs
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serde.rs
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use super::super::{
dictionary::serde::DictionaryVisitor, variant_array::serde::VariantArrayVisitor,
};
use super::*;
use ::serde::{
de::{EnumAccess, Error, MapAccess, SeqAccess, VariantAccess, Visitor},
ser::SerializeMap,
Deserialize, Deserializer, Serialize, Serializer,
};
use std::fmt::Formatter;
impl Serialize for Variant {
#[inline]
fn serialize<S>(&self, ser: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where
S: Serializer,
{
match self.dispatch() {
VariantDispatch::Nil => ser.serialize_none(),
VariantDispatch::Bool(v) => ser.serialize_bool(v),
VariantDispatch::I64(v) => ser.serialize_i64(v),
VariantDispatch::F64(v) => ser.serialize_f64(v),
VariantDispatch::GodotString(v) => ser.serialize_str(&v.to_string()),
VariantDispatch::Vector2(v) => v.serialize(ser),
VariantDispatch::Rect2(v) => v.serialize(ser),
VariantDispatch::Vector3(v) => v.serialize(ser),
VariantDispatch::Transform2D(v) => v.serialize(ser),
VariantDispatch::Plane(v) => v.serialize(ser),
VariantDispatch::Quat(v) => v.serialize(ser),
VariantDispatch::Aabb(v) => v.serialize(ser),
VariantDispatch::Basis(v) => v.serialize(ser),
VariantDispatch::Transform(v) => v.serialize(ser),
VariantDispatch::Color(v) => v.serialize(ser),
VariantDispatch::NodePath(v) => v.serialize(ser),
VariantDispatch::Rid(_rid) => ser.serialize_newtype_variant(
"Variant",
VariantType::Rid as u32,
VariantType::Rid.name(),
&(),
),
VariantDispatch::Object(_object) => ser.serialize_newtype_variant(
"Variant",
VariantType::Object as u32,
VariantType::Object.name(),
&(),
),
VariantDispatch::Dictionary(v) => v.serialize(ser),
VariantDispatch::VariantArray(v) => v.serialize(ser),
VariantDispatch::ByteArray(v) => v.serialize(ser),
VariantDispatch::Int32Array(v) => v.serialize(ser),
VariantDispatch::Float32Array(v) => v.serialize(ser),
VariantDispatch::StringArray(v) => v.serialize(ser),
VariantDispatch::Vector2Array(v) => v.serialize(ser),
VariantDispatch::Vector3Array(v) => v.serialize(ser),
VariantDispatch::ColorArray(v) => v.serialize(ser),
}
}
}
/// This allows (de)serializing to/from non-self-describing formats by avoiding serializing `Variant`s
// Can't just use a HashMap because VariantDispatch doesn't implement Hash, and this avoids cloning all of the entries anyway
struct DictionaryDispatch(Dictionary);
impl<'d> Serialize for DictionaryDispatch {
fn serialize<S>(&self, serializer: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where
S: Serializer,
{
let mut ser = serializer.serialize_map(Some(self.0.len() as usize))?;
for (key, value) in self.0.iter() {
ser.serialize_entry(&key.dispatch(), &value.dispatch())?
}
ser.end()
}
}
impl<'de> Deserialize<'de> for DictionaryDispatch {
fn deserialize<D>(deserializer: D) -> Result<Self, <D as Deserializer<'de>>::Error>
where
D: Deserializer<'de>,
{
struct DictionaryDispatchVisitor;
impl<'de> Visitor<'de> for DictionaryDispatchVisitor {
type Value = DictionaryDispatch;
fn expecting(&self, formatter: &mut Formatter) -> std::fmt::Result {
formatter.write_str("a map of VariantDispatch to VariantDispatch")
}
fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
where
A: MapAccess<'de>,
{
let dict = Dictionary::new();
while let Some((key, value)) =
map.next_entry::<VariantDispatch, VariantDispatch>()?
{
dict.insert(Variant::from(&key), Variant::from(&value))
}
Ok(DictionaryDispatch(dict.into_shared()))
}
}
deserializer.deserialize_map(DictionaryDispatchVisitor)
}
}
impl Serialize for VariantDispatch {
#[inline]
fn serialize<S>(&self, ser: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where
S: Serializer,
{
use VariantDispatch::*;
macro_rules! newtype_variant {
($t:expr, $v:expr) => {
ser.serialize_newtype_variant("VariantDispatch", $t as u32, $t.name(), $v)
};
}
match self {
Nil => ser.serialize_unit_variant(
"VariantDispatch",
VariantType::Nil as u32,
VariantType::Nil.name(),
),
Bool(v) => newtype_variant!(VariantType::Bool, v),
I64(v) => newtype_variant!(VariantType::I64, v),
F64(v) => newtype_variant!(VariantType::F64, v),
GodotString(v) => newtype_variant!(VariantType::GodotString, v),
Vector2(v) => newtype_variant!(VariantType::Vector2, v),
Rect2(v) => newtype_variant!(VariantType::Rect2, v),
Vector3(v) => newtype_variant!(VariantType::Vector3, v),
Transform2D(v) => newtype_variant!(VariantType::Transform2D, v),
Plane(v) => newtype_variant!(VariantType::Plane, v),
Quat(v) => newtype_variant!(VariantType::Quat, v),
Aabb(v) => newtype_variant!(VariantType::Aabb, v),
Basis(v) => newtype_variant!(VariantType::Basis, v),
Transform(v) => newtype_variant!(VariantType::Transform, v),
Color(v) => newtype_variant!(VariantType::Color, v),
NodePath(v) => newtype_variant!(VariantType::NodePath, v),
Rid(v) => newtype_variant!(VariantType::Rid, v),
Object(_) => newtype_variant!(VariantType::Object, &Variant::new()),
Dictionary(v) => {
newtype_variant!(VariantType::Dictionary, &DictionaryDispatch(v.new_ref()))
}
VariantArray(v) => {
//Allows serializing to non-self-describing formats by avoiding serializing `Variant`s
let vec = v.iter().map(|v| v.dispatch()).collect::<Vec<_>>();
newtype_variant!(VariantType::VariantArray, &vec)
}
ByteArray(v) => newtype_variant!(VariantType::ByteArray, v),
Int32Array(v) => newtype_variant!(VariantType::Int32Array, v),
Float32Array(v) => newtype_variant!(VariantType::Float32Array, v),
StringArray(v) => newtype_variant!(VariantType::StringArray, v),
Vector2Array(v) => newtype_variant!(VariantType::Vector2Array, v),
Vector3Array(v) => newtype_variant!(VariantType::Vector3Array, v),
ColorArray(v) => newtype_variant!(VariantType::ColorArray, v),
}
}
}
struct VariantDispatchVisitor;
impl<'de> Visitor<'de> for VariantDispatchVisitor {
type Value = VariantDispatch;
fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
formatter.write_str("enum VariantDispatch")
}
fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
where
A: EnumAccess<'de>,
{
use VariantType::*;
let (t, v) = data.variant()?;
Ok(match t {
Nil => {
v.unit_variant()?;
VariantDispatch::Nil
}
Bool => VariantDispatch::Bool(v.newtype_variant()?),
I64 => VariantDispatch::I64(v.newtype_variant()?),
F64 => VariantDispatch::F64(v.newtype_variant()?),
GodotString => VariantDispatch::GodotString(v.newtype_variant()?),
Vector2 => VariantDispatch::Vector2(v.newtype_variant()?),
Rect2 => VariantDispatch::Rect2(v.newtype_variant()?),
Vector3 => VariantDispatch::Vector3(v.newtype_variant()?),
Transform2D => VariantDispatch::Transform2D(v.newtype_variant()?),
Plane => VariantDispatch::Plane(v.newtype_variant()?),
Quat => VariantDispatch::Quat(v.newtype_variant()?),
Aabb => VariantDispatch::Aabb(v.newtype_variant()?),
Basis => VariantDispatch::Basis(v.newtype_variant()?),
Transform => VariantDispatch::Transform(v.newtype_variant()?),
Color => VariantDispatch::Color(v.newtype_variant()?),
NodePath => VariantDispatch::NodePath(v.newtype_variant()?),
Rid => VariantDispatch::Rid(v.newtype_variant()?),
Object => {
// should return None
VariantDispatch::Object(v.newtype_variant::<Option<()>>()?.to_variant())
}
Dictionary => VariantDispatch::Dictionary(v.newtype_variant::<DictionaryDispatch>()?.0),
VariantArray => VariantDispatch::VariantArray(
v.newtype_variant::<Vec<VariantDispatch>>()?
.iter()
.map(Into::<Variant>::into)
.collect::<variant_array::VariantArray<Unique>>()
.into_shared(),
),
ByteArray => VariantDispatch::ByteArray(v.newtype_variant()?),
Int32Array => VariantDispatch::Int32Array(v.newtype_variant()?),
Float32Array => VariantDispatch::Float32Array(v.newtype_variant()?),
StringArray => VariantDispatch::StringArray(v.newtype_variant()?),
Vector2Array => VariantDispatch::Vector2Array(v.newtype_variant()?),
Vector3Array => VariantDispatch::Vector3Array(v.newtype_variant()?),
ColorArray => VariantDispatch::ColorArray(v.newtype_variant()?),
})
}
}
impl<'de> Deserialize<'de> for VariantDispatch {
#[inline]
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_enum(
"VariantDispatch",
&VariantType::NAMES,
VariantDispatchVisitor,
)
}
}
struct VariantVisitor;
impl<'de> Visitor<'de> for VariantVisitor {
type Value = Variant;
fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
formatter.write_str("a Variant")
}
fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E>
where
E: Error,
{
Ok(v.to_variant())
}
fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
where
E: Error,
{
Ok(v.to_variant())
}
fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
where
E: Error,
{
self.visit_i64(v as i64)
}
fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E>
where
E: Error,
{
Ok(v.to_variant())
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: Error,
{
if v == "Nil" {
//`VariantDispatch::Nil` could be represented as the string "Nil"
return Ok(Variant::new());
}
Ok(v.to_variant())
}
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
where
E: Error,
{
Ok(ByteArray::from_slice(v).to_variant())
}
fn visit_none<E>(self) -> Result<Self::Value, E>
where
E: Error,
{
Ok(Variant::new())
}
fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, <D as Deserializer<'de>>::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_any(self)
}
fn visit_unit<E>(self) -> Result<Self::Value, E>
where
E: Error,
{
Ok(().to_variant())
}
fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_any(VariantVisitor)
}
fn visit_seq<A>(self, seq: A) -> Result<Self::Value, <A as SeqAccess<'de>>::Error>
where
A: SeqAccess<'de>,
{
let arr = VariantArrayVisitor.visit_seq(seq)?;
let len = arr.len();
if len == 1 {
if let VariantDispatch::VariantArray(arr) = arr.get(0).dispatch() {
if arr.len() == 3 {
if let Some(v) = arr.get(0).try_to_vector3() {
//assume format may have treated Basis as a sequence of one element
if let Some(basis) = basis_seq(&arr, v) {
return Ok(basis.to_variant());
}
}
}
}
} else if len == 2 {
let first = arr.get(0).dispatch();
match first {
VariantDispatch::F64(x) => {
let x = x as f32;
if let Some(y) = f32_field(&arr.get(1)) {
return Ok(Vector2 { x, y }.to_variant());
}
}
VariantDispatch::Vector2(position) => {
if let Some(size) = arr.get(1).try_to_vector2() {
return Ok(Rect2 { position, size }.to_variant());
}
}
VariantDispatch::Vector3(pos_or_norm) => {
let next = arr.get(1);
if let Some(d) = f32_field(&next) {
let normal = pos_or_norm;
return Ok(Plane { normal, d }.to_variant());
} else if let Some(size) = next.try_to_vector3() {
let position = pos_or_norm;
return Ok(Aabb { position, size }.to_variant());
}
}
_ => {}
}
} else if len == 3 {
let first = arr.get(0).dispatch();
match first {
VariantDispatch::F64(x) => {
let x = x as f32;
if let Some(y) = f32_field(&arr.get(1)) {
if let Some(z) = f32_field(&arr.get(2)) {
return Ok(Vector3 { x, y, z }.to_variant());
}
}
}
VariantDispatch::Vector2(x) => {
if let Some(y) = arr.get(1).try_to_vector2() {
if let Some(origin) = arr.get(2).try_to_vector2() {
return Ok(Transform2D { x, y, origin }.to_variant());
}
}
}
VariantDispatch::Vector3(v) => {
if let Some(basis) = basis_seq(&arr, v) {
return Ok(basis.to_variant());
}
}
_ => {}
}
} else if len == 4 {
if let Some(r) = f32_field(&arr.get(0)) {
if let Some(g) = f32_field(&arr.get(1)) {
if let Some(b) = f32_field(&arr.get(2)) {
if let Some(a) = f32_field(&arr.get(3)) {
//Assume it's a Color rather than a Quat since Godot calls arrays of
//4-float structs `ColorArray`s.
return Ok(Color { r, g, b, a }.to_variant());
}
}
}
}
}
Ok(arr.owned_to_variant())
}
fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error>
where
A: MapAccess<'de>,
{
let dict = DictionaryVisitor.visit_map(map)?;
let len = dict.len();
if len == 1 {
let (key, value) = dict.iter().next().unwrap();
if let Some(key) = key.try_to_string() {
if let Some(v) = string_tagged(&key, value) {
return Ok(v);
}
} else if let Some(key) = key.try_to_i64() {
if let Some(v) = int_tagged(key, value) {
return Ok(v);
}
}
} else if len == 2 {
if let Some(v) = vec2_plane_xform_rect2_or_aabb(&dict) {
return Ok(v);
}
} else if len == 3 {
if let Some(v) = vec3_or_xform2d(&dict) {
return Ok(v);
}
} else if len == 4 {
if let Some(v) = quat_or_color(&dict) {
return Ok(v);
}
}
Ok(dict.owned_to_variant())
}
}
impl<'de> Deserialize<'de> for Variant {
#[inline]
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_any(VariantVisitor)
}
}
fn basis_seq<Access: ThreadAccess>(arr: &VariantArray<Access>, first: Vector3) -> Option<Basis> {
if let Some(second) = arr.get(1).try_to_vector3() {
if let Some(third) = arr.get(2).try_to_vector3() {
return Some(Basis {
elements: [first, second, third],
});
}
}
None
}
fn string_tagged(key: &str, value: Variant) -> Option<Variant> {
let s = key;
let value_type = value.get_type();
if (s == value_type.name())
|| ((value_type == Option::<()>::None.to_variant().get_type()) && (s == "Object"))
|| ((value_type == ().to_variant().get_type()) && (s == "Rid"))
//maybe a Basis represented as a Map, in which case visit_seq will have assumed [Vector3; 3] was a Basis
|| ((value_type == VariantType::Basis) && (s == "elements"))
{
return Some(value);
} else if s == VariantType::NodePath.name() {
if let Some(path) = value.try_to_string() {
return Some(NodePath::from_str(&*path).to_variant());
}
} else if let Some(arr) = value.try_to_array() {
if let Some(s) = s.strip_suffix("Array") {
match s {
"Variant" => return Some(value), //for completeness, should have been handled by first condition
"Byte" => return Some(ByteArray::from_variant_array(&arr).to_variant()),
"Int32" => return Some(Int32Array::from_variant_array(&arr).to_variant()),
"Float32" => return Some(Float32Array::from_variant_array(&arr).to_variant()),
"Vector2" => return Some(Vector2Array::from_variant_array(&arr).to_variant()),
"Vector3" => return Some(Vector3Array::from_variant_array(&arr).to_variant()),
"Color" => return Some(ColorArray::from_variant_array(&arr).to_variant()),
_ => {}
}
}
}
None
}
fn int_tagged(key: i64, value: Variant) -> Option<Variant> {
//TODO: The field enums serde generates for structs could get stored as ints.
// We could either hand-write all the impls so we know what the int will be,
// or assume serde will keep the indices the same as the declaration order,
// or just not support deserializing Variants from formats that store the field
// identifier as an int (VariantDispatch should still work).
let i = key;
if i == value.get_type() as i64 {
return Some(value);
} else if (i == VariantType::Object as i64) && (value.get_type() == VariantType::Nil) {
return Some(Variant::new());
} else if (i == VariantType::Rid as i64) && (value.get_type() == ().to_variant().get_type()) {
return Some(Rid::new().to_variant());
} else if let Some(arr) = value.try_to_array() {
if i == VariantType::ByteArray as i64 {
return Some(ByteArray::from_variant_array(&arr).to_variant());
} else if i == VariantType::Int32Array as i64 {
return Some(Int32Array::from_variant_array(&arr).to_variant());
} else if i == VariantType::Float32Array as i64 {
return Some(Float32Array::from_variant_array(&arr).to_variant());
} else if i == VariantType::Vector2Array as i64 {
return Some(Vector2Array::from_variant_array(&arr).to_variant());
} else if i == VariantType::Vector3Array as i64 {
return Some(Vector3Array::from_variant_array(&arr).to_variant());
} else if i == VariantType::ColorArray as i64 {
return Some(ColorArray::from_variant_array(&arr).to_variant());
}
}
None
}
fn vec2_plane_xform_rect2_or_aabb(dict: &Dictionary<Unique>) -> Option<Variant> {
if let Some(x) = get_f32(&dict, "x") {
if let Some(y) = get_f32(&dict, "y") {
return Some(Vector2 { x, y }.to_variant());
}
} else if let Some(normal) = dict.get("normal").try_to_vector3() {
if let Some(d) = get_f32(&dict, "d") {
return Some(Plane { normal, d }.to_variant());
}
} else if let Some(basis) = dict.get("basis").try_to_basis() {
if let Some(origin) = dict.get("origin").try_to_vector3() {
return Some(Transform { basis, origin }.to_variant());
}
} else {
match dict.get("position").dispatch() {
VariantDispatch::Vector2(position) => {
if let Some(size) = dict.get("size").try_to_vector2() {
return Some(Rect2 { position, size }.to_variant());
}
}
VariantDispatch::Vector3(position) => {
if let Some(size) = dict.get("size").try_to_vector3() {
return Some(Aabb { position, size }.to_variant());
}
}
_ => {}
}
}
None
}
fn vec3_or_xform2d(dict: &Dictionary<Unique>) -> Option<Variant> {
if let Some(x) = get_f32(&dict, "x") {
if let Some(y) = get_f32(&dict, "y") {
if let Some(z) = get_f32(&dict, "z") {
return Some(Vector3 { x, y, z }.to_variant());
}
}
} else if let Some(x) = dict.get("x").try_to_vector2() {
if let Some(y) = dict.get("y").try_to_vector2() {
if let Some(origin) = dict.get("origin").try_to_vector2() {
return Some(Transform2D { x, y, origin }.to_variant());
}
}
}
None
}
fn quat_or_color(dict: &Dictionary<Unique>) -> Option<Variant> {
if let Some(x) = get_f32(&dict, "x") {
if let Some(y) = get_f32(&dict, "y") {
if let Some(z) = get_f32(&dict, "z") {
if let Some(w) = get_f32(&dict, "w") {
return Some(Quat { x, y, z, w }.to_variant());
}
}
}
} else if let Some(r) = get_f32(&dict, "r") {
if let Some(g) = get_f32(&dict, "g") {
if let Some(b) = get_f32(&dict, "b") {
if let Some(a) = get_f32(&dict, "a") {
return Some(Color { r, g, b, a }.to_variant());
}
}
}
}
None
}
fn get_f32<Access: ThreadAccess>(
dict: &Dictionary<Access>,
key: impl ToVariant + ToVariantEq,
) -> Option<f32> {
dict.try_get(key).as_ref().and_then(f32_field)
}
fn f32_field(v: &Variant) -> Option<f32> {
v.try_to_f64()
.map(|f| f as f32)
.or_else(|| v.try_to_i64().map(|i| i as f32))
}
#[cfg(feature = "gd_test")]
#[doc(hidden)]
pub mod tests {
use super::*;
#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct VariantSerdeTest {
some: Option<Variant>,
none: Option<Variant>,
b: Bool,
int: I64,
float: F64,
str: GodotString,
vec2: Vector2,
// rect2: Rect2, //TODO: PartialEq
vec3: Vector3,
// xform_2d: Transform2D, //TODO: PartialEq
plane: Plane,
quat: Quat,
aabb: Aabb,
basis: Basis,
xform: Transform,
color: Color,
path: NodePath,
rid: Rid,
// obj: Object, //TODO: how best to test this?
// dict: Dictionary, //TODO: PartialEq
// v_arr: VariantArray, //TODO: PartialEq
byte_arr: ByteArray,
int_arr: Int32Array,
float_arr: Float32Array,
str_arr: StringArray,
vec2_arr: Vector2Array,
vec3_arr: Vector3Array,
color_arr: ColorArray,
}
#[cfg(feature = "gd_test")]
impl VariantSerdeTest {
#[doc(hidden)]
fn new() -> Self {
Self {
some: Some(Variant::from_bool(true)),
none: None,
b: false,
int: 1,
float: 2.0,
str: "this is a str".into(),
vec2: Vector2::RIGHT,
vec3: Vector3::BACK,
plane: Plane {
normal: Vector3::ONE.normalized(),
d: 3.0,
},
quat: Quat::new(4.1, 5.2, 6.3, 7.5),
aabb: Aabb {
position: Default::default(),
size: Default::default(),
},
basis: Basis::identity().rotated(Vector3::UP, std::f32::consts::TAU / 3.0),
xform: Transform {
basis: Default::default(),
origin: Default::default(),
},
color: Color::from_rgb(0.549, 0.0, 1.0),
path: "/root/Node".into(),
rid: Rid::new(),
byte_arr: Default::default(),
int_arr: Default::default(),
float_arr: Default::default(),
str_arr: Default::default(),
vec2_arr: Default::default(),
vec3_arr: Default::default(),
color_arr: Default::default(),
}
}
}
pub fn test_ron_round_trip() -> bool {
let test = VariantSerdeTest::new();
let test_str = ron::to_string(&test);
if test_str.is_err() { return false }
let mut de = ron::Deserializer::from_str(test_str.as_ref().unwrap());
if de.is_err() { return false }
VariantSerdeTest::deserialize(de.as_mut().unwrap())
.map_or(false, |test_again| godot_dbg!(test_again == test))
}
}