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use webcore::value::Reference;
use webcore::try_from::TryInto;
/// Used by the `dataset` HTML attribute to represent data for custom attributes added to elements.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/DOMStringMap)
pub struct StringMap( Reference );
reference_boilerplate! {
StringMap,
instanceof DOMStringMap
}
// The methods here are deliberately named exactly as those from Rust's HashMap.
impl StringMap {
/// Returns a value corresponding to the key.
pub fn get( &self, key: &str ) -> Option< String > {
js!( return @{self}[ @{key} ]; ).try_into().ok()
}
/// Inserts a key-value pair into the map.
pub fn insert( &self, key: &str, value: &str ) {
js!( @(no_return)
@{self}[ @{key} ] = @{value};
);
}
/// Removes a key from the map.
pub fn remove( &self, key: &str ) {
js!( @(no_return)
delete @{self}[ @{key} ];
);
}
/// Returns true if the map contains a value for the specified key.
pub fn contains_key( &self, key: &str ) -> bool {
js!( return @{key} in @{self}; ).try_into().unwrap()
}
}