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conversions: Make a is_type_compatible method for ArrayBufferViews.

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This commit is contained in:
Emilio Cobos Álvarez 2016-01-04 15:51:01 +01:00
parent 43d395a682
commit d30f05554b
2 changed files with 67 additions and 21 deletions
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76
components/script/dom/bindings/conversions.rs
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@ -339,15 +339,62 @@ impl<T: Reflectable> ToJSValConvertible for Root<T> {
}
/// A JS ArrayBufferView contents can only be viewed as the types marked with this trait
pub unsafe trait ArrayBufferViewContents: Clone {}
unsafe impl ArrayBufferViewContents for u8 {}
unsafe impl ArrayBufferViewContents for i8 {}
unsafe impl ArrayBufferViewContents for u16 {}
unsafe impl ArrayBufferViewContents for i16 {}
unsafe impl ArrayBufferViewContents for u32 {}
unsafe impl ArrayBufferViewContents for i32 {}
unsafe impl ArrayBufferViewContents for f32 {}
unsafe impl ArrayBufferViewContents for f64 {}
pub unsafe trait ArrayBufferViewContents: Clone {
/// Check if the JS ArrayBufferView type is compatible with the implementor of the
/// trait
fn is_type_compatible(ty: Type) -> bool;
}
unsafe impl ArrayBufferViewContents for u8 {
fn is_type_compatible(ty: Type) -> bool {
match ty {
Type::Uint8 |
Type::Uint8Clamped => true,
_ => false,
}
}
}
unsafe impl ArrayBufferViewContents for i8 {
fn is_type_compatible(ty: Type) -> bool {
ty as i32 == Type::Int8 as i32
}
}
unsafe impl ArrayBufferViewContents for u16 {
fn is_type_compatible(ty: Type) -> bool {
ty as i32 == Type::Uint16 as i32
}
}
unsafe impl ArrayBufferViewContents for i16 {
fn is_type_compatible(ty: Type) -> bool {
ty as i32 == Type::Int16 as i32
}
}
unsafe impl ArrayBufferViewContents for u32 {
fn is_type_compatible(ty: Type) -> bool {
ty as i32 == Type::Uint32 as i32
}
}
unsafe impl ArrayBufferViewContents for i32 {
fn is_type_compatible(ty: Type) -> bool {
ty as i32 == Type::Int32 as i32
}
}
unsafe impl ArrayBufferViewContents for f32 {
fn is_type_compatible(ty: Type) -> bool {
ty as i32 == Type::Float32 as i32
}
}
unsafe impl ArrayBufferViewContents for f64 {
fn is_type_compatible(ty: Type) -> bool {
ty as i32 == Type::Float64 as i32
}
}
/// Returns a mutable slice of the Array Buffer View data, viewed as T, without checking the real
/// type of it.
@ -370,11 +417,10 @@ pub fn array_buffer_view_to_vec<T: ArrayBufferViewContents>(abv: *mut JSObject)
/// Returns a mutable slice of the Array Buffer View data, viewed as T, checking that the real type
/// of it is ty.
pub unsafe fn array_buffer_view_data_checked<'a, T: ArrayBufferViewContents>(abv: *mut JSObject,
ty: Type) -> Option<&'a mut [T]> {
pub unsafe fn array_buffer_view_data_checked<'a, T: ArrayBufferViewContents>(abv: *mut JSObject)
-> Option<&'a mut [T]> {
array_buffer_view_data::<T>(abv).and_then(|data| {
let real_ty = JS_GetArrayBufferViewType(abv);
if real_ty as i32 == ty as i32 {
if T::is_type_compatible(JS_GetArrayBufferViewType(abv)) {
Some(data)
} else {
None
@ -384,8 +430,8 @@ pub unsafe fn array_buffer_view_data_checked<'a, T: ArrayBufferViewContents>(abv
/// Returns a copy of the ArrayBufferView data, viewed as T, checking that the real type
/// of it is ty.
pub fn array_buffer_view_to_vec_checked<T: ArrayBufferViewContents>(abv: *mut JSObject, ty: Type) -> Option<Vec<T>> {
pub fn array_buffer_view_to_vec_checked<T: ArrayBufferViewContents>(abv: *mut JSObject) -> Option<Vec<T>> {
unsafe {
array_buffer_view_data_checked(abv, ty).map(|data| data.to_vec())
array_buffer_view_data_checked(abv).map(|data| data.to_vec())
}
}