mirror of
https://github.com/denoland/deno.git
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95 lines
3.2 KiB
Rust
95 lines
3.2 KiB
Rust
use rusty_v8 as v8;
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use std::any::TypeId;
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/// SerializablePkg exists to provide a fast path for op returns,
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/// allowing them to avoid boxing primtives (ints/floats/bool/unit/...)
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pub enum SerializablePkg {
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MinValue(MinValue),
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Serializable(Box<dyn serde_v8::Serializable>),
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}
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impl SerializablePkg {
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pub fn to_v8<'a>(
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&self,
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scope: &mut v8::HandleScope<'a>,
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) -> Result<v8::Local<'a, v8::Value>, serde_v8::Error> {
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match &*self {
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Self::MinValue(x) => serde_v8::to_v8(scope, x),
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Self::Serializable(x) => x.to_v8(scope),
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}
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}
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}
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/// MinValue serves as a lightweight serializable wrapper around primitives
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/// so that we can use them for async values
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#[derive(Clone, Copy)]
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pub enum MinValue {
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Unit(()),
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Bool(bool),
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Int8(i8),
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Int16(i16),
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Int32(i32),
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Int64(i64),
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UInt8(u8),
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UInt16(u16),
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UInt32(u32),
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UInt64(u64),
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Float32(f32),
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Float64(f64),
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}
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impl serde::Serialize for MinValue {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: serde::Serializer,
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{
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match *self {
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Self::Unit(_) => serializer.serialize_unit(),
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Self::Bool(x) => serializer.serialize_bool(x),
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Self::Int8(x) => serializer.serialize_i8(x),
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Self::Int16(x) => serializer.serialize_i16(x),
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Self::Int32(x) => serializer.serialize_i32(x),
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Self::Int64(x) => serializer.serialize_i64(x),
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Self::UInt8(x) => serializer.serialize_u8(x),
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Self::UInt16(x) => serializer.serialize_u16(x),
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Self::UInt32(x) => serializer.serialize_u32(x),
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Self::UInt64(x) => serializer.serialize_u64(x),
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Self::Float32(x) => serializer.serialize_f32(x),
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Self::Float64(x) => serializer.serialize_f64(x),
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}
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}
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}
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impl<T: serde::Serialize + 'static> From<T> for SerializablePkg {
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fn from(x: T) -> Self {
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let tid = TypeId::of::<T>();
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if tid == TypeId::of::<()>() {
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Self::MinValue(MinValue::Unit(()))
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} else if tid == TypeId::of::<bool>() {
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Self::MinValue(MinValue::Bool(unsafe { std::mem::transmute_copy(&x) }))
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} else if tid == TypeId::of::<i8>() {
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Self::MinValue(MinValue::Int8(unsafe { std::mem::transmute_copy(&x) }))
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} else if tid == TypeId::of::<i16>() {
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Self::MinValue(MinValue::Int16(unsafe { std::mem::transmute_copy(&x) }))
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} else if tid == TypeId::of::<i32>() {
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Self::MinValue(MinValue::Int32(unsafe { std::mem::transmute_copy(&x) }))
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} else if tid == TypeId::of::<i64>() {
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Self::MinValue(MinValue::Int64(unsafe { std::mem::transmute_copy(&x) }))
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} else if tid == TypeId::of::<u8>() {
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Self::MinValue(MinValue::UInt8(unsafe { std::mem::transmute_copy(&x) }))
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} else if tid == TypeId::of::<u16>() {
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Self::MinValue(MinValue::UInt16(unsafe { std::mem::transmute_copy(&x) }))
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} else if tid == TypeId::of::<u32>() {
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Self::MinValue(MinValue::UInt32(unsafe { std::mem::transmute_copy(&x) }))
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} else if tid == TypeId::of::<u64>() {
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Self::MinValue(MinValue::UInt64(unsafe { std::mem::transmute_copy(&x) }))
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} else if tid == TypeId::of::<f32>() {
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Self::MinValue(MinValue::Float32(unsafe { std::mem::transmute_copy(&x) }))
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} else if tid == TypeId::of::<f64>() {
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Self::MinValue(MinValue::Float64(unsafe { std::mem::transmute_copy(&x) }))
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} else {
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Self::Serializable(Box::new(x))
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}
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}
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}
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