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Implement support for Uint8ClampedArray

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This commit implements support for binding APIs that take
`Uint8ClampedArray` in JS. This is pretty rare but comes up in a
`web-sys` binding or two, and we're now able to bind these APIs instead
of having to omit the bindings.

The `Uint8ClampedArray` type is bound by using the `Clamped` marker
struct in Rust. For example this is declaring a JS API that takes
`Uint8ClampedArray`:

    use wasm_bindgen::Clamped;

    #[wasm_bindgen]
    extern {
        fn takes_clamped(a: Clamped<&[u8]>);
    }

The `Clamped` type currently only works when wrapping the `&[u8]`, `&mut
[u8]`, and `Vec<u8>` types. Everything else will produce an error at
`wasm-bindgen` time.

Closes #421
This commit is contained in:
Alex Crichton
2018-09-24 13:49:12 -07:00
parent d10ca579e4
commit 7b495468f6
15 changed files with 169 additions and 60 deletions
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4
crates/webidl/src/util.rs
View File

@ -63,10 +63,10 @@ pub fn mdn_doc(class: &str, method: Option<&str>) -> String {
}
// Array type is borrowed for arguments (`&[T]`) and owned for return value (`Vec<T>`).
pub(crate) fn array(base_ty: &str, pos: TypePosition, mutable: bool) -> syn::Type {
pub(crate) fn array(base_ty: &str, pos: TypePosition) -> syn::Type {
match pos {
TypePosition::Argument => {
shared_ref(slice_ty(ident_ty(raw_ident(base_ty))), mutable)
shared_ref(slice_ty(ident_ty(raw_ident(base_ty))), /*mutable =*/ true)
}
TypePosition::Return => {
vec_ty(ident_ty(raw_ident(base_ty)))