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into_dart.rs
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into_dart.rs
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use std::{
ffi::{c_void, CString},
mem::ManuallyDrop,
};
use crate::{
dart_array::DartArray,
ffi::{DartHandleFinalizer, *},
};
/// A trait to convert between Rust types and Dart Types that could then
/// be sent to the isolate
///
/// see: [`crate::Isolate::post`]
pub trait IntoDart {
/// Consumes `Self` and Performs the conversion.
fn into_dart(self) -> DartCObject;
}
/// A trait that is [`IntoDart`] and is also not a primitive type. It is used to
/// avoid the ambiguity of whether types such as [`Vec<i32>`] should be
/// converted into [`Int32List`] or [`List<int>`]
pub trait IntoDartExceptPrimitive: IntoDart {}
impl<T> IntoDart for T
where
T: Into<DartCObject>,
{
fn into_dart(self) -> DartCObject { self.into() }
}
impl<T> IntoDartExceptPrimitive for T where T: IntoDart + Into<DartCObject> {}
impl IntoDart for () {
fn into_dart(self) -> DartCObject {
DartCObject {
ty: DartCObjectType::DartNull,
// I don't know what value should we send, so I send a false
// I guess dart vm check for the type first, so if it is null it
// return null and ignore the value
value: DartCObjectValue { as_bool: false },
}
}
}
impl IntoDart for i32 {
fn into_dart(self) -> DartCObject {
DartCObject {
ty: DartCObjectType::DartInt32,
value: DartCObjectValue { as_int32: self },
}
}
}
impl IntoDart for i64 {
fn into_dart(self) -> DartCObject {
DartCObject {
ty: DartCObjectType::DartInt64,
value: DartCObjectValue { as_int64: self },
}
}
}
impl IntoDart for f32 {
fn into_dart(self) -> DartCObject { (self as f64).into_dart() }
}
impl IntoDart for f64 {
fn into_dart(self) -> DartCObject {
DartCObject {
ty: DartCObjectType::DartDouble,
value: DartCObjectValue { as_double: self },
}
}
}
impl IntoDart for bool {
fn into_dart(self) -> DartCObject {
DartCObject {
ty: DartCObjectType::DartBool,
value: DartCObjectValue { as_bool: self },
}
}
}
impl IntoDart for String {
fn into_dart(self) -> DartCObject {
let s = CString::new(self).unwrap_or_default();
s.into_dart()
}
}
impl IntoDartExceptPrimitive for String {}
impl IntoDart for &'_ str {
fn into_dart(self) -> DartCObject { self.to_string().into_dart() }
}
impl IntoDartExceptPrimitive for &'_ str {}
impl IntoDart for CString {
fn into_dart(self) -> DartCObject {
DartCObject {
ty: DartCObjectType::DartString,
value: DartCObjectValue {
as_string: self.into_raw(),
},
}
}
}
impl IntoDartExceptPrimitive for CString {}
/// It is used when you want to write a generic function on different data types
/// and do not want to repeat yourself dozens of times.
/// For example, inside [Drop] of [DartCObject].
pub(crate) trait DartTypedDataTypeVisitor {
fn visit<T: DartTypedDataTypeTrait>(&self);
}
/// The Rust type for corresponding [DartTypedDataType]
pub trait DartTypedDataTypeTrait {
fn dart_typed_data_type() -> DartTypedDataType;
fn function_pointer_of_free_zero_copy_buffer() -> DartHandleFinalizer;
}
macro_rules! dart_typed_data_type_trait_impl {
($($dart_type:path => $rust_type:ident + $free_zero_copy_buffer_func:ident),+) => {
$(
impl DartTypedDataTypeTrait for $rust_type {
fn dart_typed_data_type() -> DartTypedDataType {
$dart_type
}
fn function_pointer_of_free_zero_copy_buffer() -> DartHandleFinalizer {
$free_zero_copy_buffer_func
}
}
impl IntoDart for Vec<$rust_type> {
fn into_dart(self) -> DartCObject {
let mut vec = ManuallyDrop::new(self);
let data = DartNativeTypedData {
ty: $rust_type::dart_typed_data_type(),
length: vec.len() as isize,
values: vec.as_mut_ptr() as *mut _,
};
DartCObject {
ty: DartCObjectType::DartTypedData,
value: DartCObjectValue {
as_typed_data: data,
},
}
}
}
#[doc(hidden)]
#[no_mangle]
unsafe extern "C" fn $free_zero_copy_buffer_func(
isolate_callback_data: *mut c_void,
peer: *mut c_void,
) {
let len = (isolate_callback_data as isize) as usize;
let ptr = peer as *mut $rust_type;
drop(Vec::from_raw_parts(ptr, len, len));
}
)+
pub(crate) fn visit_dart_typed_data_type<V: DartTypedDataTypeVisitor>(ty: DartTypedDataType, visitor: &V) {
match ty {
$(
$dart_type => visitor.visit::<$rust_type>(),
)+
_ => panic!("visit_dart_typed_data_type see unexpected DartTypedDataType={:?}", ty)
}
}
}
}
dart_typed_data_type_trait_impl!(
DartTypedDataType::Int8 => i8 + free_zero_copy_buffer_i8,
DartTypedDataType::Uint8 => u8 + free_zero_copy_buffer_u8,
DartTypedDataType::Int16 => i16 + free_zero_copy_buffer_i16,
DartTypedDataType::Uint16 => u16 + free_zero_copy_buffer_u16,
DartTypedDataType::Int32 => i32 + free_zero_copy_buffer_i32,
DartTypedDataType::Uint32 => u32 + free_zero_copy_buffer_u32,
DartTypedDataType::Int64 => i64 + free_zero_copy_buffer_i64,
DartTypedDataType::Uint64 => u64 + free_zero_copy_buffer_u64,
DartTypedDataType::Float32 => f32 + free_zero_copy_buffer_f32,
DartTypedDataType::Float64 => f64 + free_zero_copy_buffer_f64
);
impl<T> IntoDart for ZeroCopyBuffer<Vec<T>>
where
T: DartTypedDataTypeTrait,
{
fn into_dart(self) -> DartCObject {
let mut vec = ManuallyDrop::new(self.0);
vec.shrink_to_fit();
let length = vec.len();
assert_eq!(length, vec.capacity());
let ptr = vec.as_mut_ptr();
DartCObject {
ty: DartCObjectType::DartExternalTypedData,
value: DartCObjectValue {
as_external_typed_data: DartNativeExternalTypedData {
ty: T::dart_typed_data_type(),
length: length as isize,
data: ptr as *mut u8,
peer: ptr as *mut c_void,
callback: T::function_pointer_of_free_zero_copy_buffer(),
},
},
}
}
}
impl<T> IntoDartExceptPrimitive for ZeroCopyBuffer<Vec<T>> where
T: DartTypedDataTypeTrait
{
}
impl<T> IntoDart for Vec<T>
where
T: IntoDartExceptPrimitive,
{
fn into_dart(self) -> DartCObject { DartArray::from(self).into_dart() }
}
impl<T> IntoDart for Option<T>
where
T: IntoDart,
{
fn into_dart(self) -> DartCObject {
match self {
Some(v) => v.into_dart(),
None => ().into_dart(),
}
}
}
impl<T> IntoDartExceptPrimitive for Option<T> where T: IntoDart {}
impl<T, E> IntoDart for Result<T, E>
where
T: IntoDart,
E: ToString,
{
fn into_dart(self) -> DartCObject {
match self {
Ok(v) => v.into_dart(),
Err(e) => e.to_string().into_dart(),
}
}
}
impl<T, E> IntoDartExceptPrimitive for Result<T, E>
where
T: IntoDart,
E: ToString,
{
}
/// A workaround to send raw pointers to dart over the port.
/// it will be sent as int64 on 64bit targets, and as int32 on 32bit targets.
#[cfg(target_pointer_width = "64")]
impl<T> IntoDart for *const T {
fn into_dart(self) -> DartCObject {
DartCObject {
ty: DartCObjectType::DartInt64,
value: DartCObjectValue {
as_int64: self as _,
},
}
}
}
#[cfg(target_pointer_width = "64")]
impl<T> IntoDart for *mut T {
fn into_dart(self) -> DartCObject {
DartCObject {
ty: DartCObjectType::DartInt64,
value: DartCObjectValue {
as_int64: self as _,
},
}
}
}
#[cfg(target_pointer_width = "32")]
impl<T> IntoDart for *const T {
fn into_dart(self) -> DartCObject {
DartCObject {
ty: DartCObjectType::DartInt32,
value: DartCObjectValue {
as_int32: self as _,
},
}
}
}
#[cfg(target_pointer_width = "32")]
impl<T> IntoDart for *mut T {
fn into_dart(self) -> DartCObject {
DartCObject {
ty: DartCObjectType::DartInt32,
value: DartCObjectValue {
as_int32: self as _,
},
}
}
}