1use std::any::type_name;
2use std::ops::{Deref, DerefMut};
3use std::ptr;
4
5use super::Object;
6use crate::{
7 bindgen_runtime::{FromNapiValue, TypeName, ValidateNapiValue},
8 check_status, sys, Env, NapiRaw, NapiValue, ValueType,
9};
10
11pub type This<T = Object> = T;
12
13pub struct ClassInstance<T: 'static> {
14 pub value: sys::napi_value,
15 inner: &'static mut T,
16}
17
18impl<T: 'static> ClassInstance<T> {
19 #[doc(hidden)]
20 pub fn new(value: sys::napi_value, inner: &'static mut T) -> Self {
21 Self { value, inner }
22 }
23
24 pub fn as_object(&self, env: Env) -> Object {
25 unsafe { Object::from_raw_unchecked(env.raw(), self.value) }
26 }
27}
28
29impl<T: 'static> NapiRaw for ClassInstance<T> {
30 unsafe fn raw(&self) -> sys::napi_value {
31 self.value
32 }
33}
34
35impl<T: 'static> TypeName for ClassInstance<T>
36where
37 &'static T: TypeName,
38{
39 fn type_name() -> &'static str {
40 type_name::<&T>()
41 }
42
43 fn value_type() -> ValueType {
44 <&T>::value_type()
45 }
46}
47
48impl<T: 'static> ValidateNapiValue for ClassInstance<T>
49where
50 &'static T: ValidateNapiValue,
51{
52 unsafe fn validate(
53 env: sys::napi_env,
54 napi_val: sys::napi_value,
55 ) -> crate::Result<sys::napi_value> {
56 unsafe { <&T>::validate(env, napi_val) }
57 }
58}
59
60impl<T: 'static> FromNapiValue for ClassInstance<T> {
61 unsafe fn from_napi_value(env: sys::napi_env, napi_val: sys::napi_value) -> crate::Result<Self> {
62 let mut value: *mut c_void = ptr::null_mut();
63 check_status!(
64 unsafe { sys::napi_unwrap(env, napi_val, &mut value) },
65 "Unwrap value [{}] from class failed",
66 type_name::<T>(),
67 )?;
68 let value: Box = unsafe { Box::from_raw(value as *mut T) };
69 Ok(Self {
70 value: napi_val,
71 inner: Box::leak(value),
72 })
73 }
74}
75
76impl<T: 'static> Deref for ClassInstance<T> {
77 type Target = T;
78
79 fn deref(&self) -> &Self::Target {
80 self.inner
81 }
82}
83
84impl<T: 'static> DerefMut for ClassInstance<T> {
85 fn deref_mut(&mut self) -> &mut T {
86 self.inner
87 }
88}
89
90impl<T: 'static> AsRef<T> for ClassInstance<T> {
91 fn as_ref(&self) -> &T {
92 self.inner
93 }
94}
95
96impl<T: 'static> AsMut<T> for ClassInstance<T> {
97 fn as_mut(&mut self) -> &mut T {
98 self.inner
99 }
100}
101