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Add customisable is_type_of

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This commit is contained in:
Ingvar Stepanyan
2019-03-26 19:29:46 +00:00
parent 4211fcd992
commit cb880bdbff
6 changed files with 43 additions and 20 deletions
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16
src/cast.rs
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@ -30,14 +30,14 @@ where
/// Performs a dynamic cast (checked at runtime) of this value into the
/// target type `T`.
///
/// This method will return `Err(self)` if `self.is_instance_of::<T>()`
/// This method will return `Err(self)` if `T::is_type_of(self)`
/// returns `false`, and otherwise it will return `Ok(T)` manufactured with
/// an unchecked cast (verified correct via the `instanceof` operation).
fn dyn_into<T>(self) -> Result<T, Self>
where
T: JsCast,
{
if self.is_instance_of::<T>() {
if T::is_type_of(self.as_ref()) {
Ok(self.unchecked_into())
} else {
Err(self)
@ -47,14 +47,14 @@ where
/// Performs a dynamic cast (checked at runtime) of this value into the
/// target type `T`.
///
/// This method will return `None` if `self.is_instance_of::<T>()`
/// This method will return `None` if `T::is_type_of(self)`
/// returns `false`, and otherwise it will return `Some(&T)` manufactured
/// with an unchecked cast (verified correct via the `instanceof` operation).
fn dyn_ref<T>(&self) -> Option<&T>
where
T: JsCast,
{
if self.is_instance_of::<T>() {
if T::is_type_of(self.as_ref()) {
Some(self.unchecked_ref())
} else {
None
@ -100,6 +100,14 @@ where
/// won't need to call this.
fn instanceof(val: &JsValue) -> bool;
/// Performs a dynamic check to see whether the `JsValue` provided
/// is a value of this type.
///
/// Unlike `instanceof`, this can be specialised to use a custom check.
fn is_type_of(val: &JsValue) -> bool {
Self::instanceof(val)
}
/// Performs a zero-cost unchecked conversion from a `JsValue` into an
/// instance of `Self`
///