convert_js/
from_js.rs

1use std::convert::Infallible;
2
3use wasm_bindgen::{JsCast, JsValue};
4
5pub trait FromJs: Sized {
6    type Error;
7    fn from_js(js_value: JsValue) -> Result<Self, Self::Error>;
8}
9
10impl FromJs for JsValue {
11    type Error = Infallible;
12
13    fn from_js(js_value: JsValue) -> Result<Self, Self::Error> {
14        Ok(js_value)
15    }
16}
17
18impl FromJs for () {
19    type Error = JsValue;
20
21    fn from_js(js_value: JsValue) -> Result<Self, Self::Error> {
22        if js_value.is_undefined() {
23            Ok(())
24        } else {
25            Err(js_value)
26        }
27    }
28}
29
30impl<T: FromJs> FromJs for Option<T> {
31    type Error = T::Error;
32
33    fn from_js(js_value: JsValue) -> Result<Self, Self::Error> {
34        if js_value.is_undefined() || js_value.is_null() {
35            Ok(None)
36        } else {
37            T::from_js(js_value).map(Some)
38        }
39    }
40}
41
42macro_rules! impl_from_js {
43    (
44        try_into:
45        $($t:ty)*
46    ) => {$(
47        impl FromJs for $t {
48            type Error = <$t as TryFrom<JsValue>>::Error;
49
50            fn from_js(js_value: JsValue) -> Result<Self, Self::Error> {
51                js_value.try_into()
52            }
53        }
54    )*};
55    (
56        dyn_into:
57            $($t:ty)+
58    ) => {$(
59        impl FromJs for $t {
60            type Error = JsValue;
61
62            fn from_js(js_value: JsValue) -> Result<Self, Self::Error> {
63                js_value.dyn_into()
64            }
65        }
66    )*};
67}
68
69impl_from_js! {
70    try_into:
71    f64
72}
73
74impl_from_js! {
75    dyn_into:
76    js_sys::Intl::Collator
77    js_sys::Intl::DateTimeFormat
78    js_sys::Intl::NumberFormat
79    js_sys::Intl::PluralRules
80    js_sys::WebAssembly::CompileError
81    js_sys::WebAssembly::Global
82    js_sys::WebAssembly::Instance
83    js_sys::WebAssembly::LinkError
84    js_sys::WebAssembly::Memory
85    js_sys::WebAssembly::Module
86    js_sys::WebAssembly::RuntimeError
87    js_sys::WebAssembly::Table
88    js_sys::Array
89    js_sys::ArrayBuffer
90    // js_sys::ArrayIter
91    js_sys::AsyncIterator
92    js_sys::BigInt
93    js_sys::BigInt64Array
94    js_sys::BigUint64Array
95    js_sys::Boolean
96    js_sys::DataView
97    js_sys::Date
98    js_sys::Error
99    js_sys::EvalError
100    js_sys::Float32Array
101    js_sys::Float64Array
102    js_sys::Function
103    js_sys::Generator
104    js_sys::Int8Array
105    js_sys::Int16Array
106    js_sys::Int32Array
107    // js_sys::IntoIter
108    // js_sys::Iter
109    js_sys::Iterator
110    js_sys::IteratorNext
111    js_sys::JsString
112    js_sys::Map
113    js_sys::Number
114    js_sys::Object
115    js_sys::Promise
116    js_sys::Proxy
117    js_sys::RangeError
118    js_sys::ReferenceError
119    js_sys::RegExp
120    js_sys::Set
121    js_sys::SharedArrayBuffer
122    js_sys::Symbol
123    js_sys::SyntaxError
124    js_sys::TypeError
125    js_sys::Uint8Array
126    js_sys::Uint8ClampedArray
127    js_sys::Uint16Array
128    js_sys::Uint32Array
129    js_sys::UriError
130    js_sys::WeakMap
131    js_sys::WeakSet
132}
convert_js/from_js.rs

convert_js/
from_js.rs
