Implement missing species getters (#1331)

* Implement get Array [ @@species ]

* Implement get Map [ @@species ]

* Adjust get Set [ @@species ]

boa/src/builtins/array/mod.rs

@@ -45,6 +45,12 @@ impl BuiltIn for Array {
 
         let symbol_iterator = WellKnownSymbols::iterator();
 
+        let get_species = FunctionBuilder::new(context, Self::get_species)
+            .name("get [Symbol.species]")
+            .constructable(false)
+            .callable(true)
+            .build();
+
         let values_function = FunctionBuilder::new(context, Self::values)
             .name("values")
             .length(0)
@@ -59,6 +65,12 @@ impl BuiltIn for Array {
         )
         .name(Self::NAME)
         .length(Self::LENGTH)
+        .static_accessor(
+            WellKnownSymbols::species(),
+            Some(get_species),
+            None,
+            Attribute::CONFIGURABLE,
+        )
         .property(
             "length",
             0,
@@ -263,6 +275,21 @@ impl Array {
         Ok(array_obj_ptr)
     }
 
+    /// `get Array [ @@species ]`
+    ///
+    /// The Array[@@species] accessor property returns the Array constructor.
+    ///
+    /// More information:
+    ///  - [ECMAScript reference][spec]
+    ///  - [MDN documentation][mdn]
+    ///
+    /// [spec]: https://tc39.es/ecma262/#sec-get-array-@@species
+    /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/@@species
+    fn get_species(this: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+        // 1. Return the this value.
+        Ok(this.clone())
+    }
+
     /// Utility function used to specify the creation of a new Array object using a constructor
     /// function that is derived from original_array.
     ///

boa/src/builtins/map/mod.rs

@@ -44,6 +44,12 @@ impl BuiltIn for Map {
         let to_string_tag = WellKnownSymbols::to_string_tag();
         let iterator_symbol = WellKnownSymbols::iterator();
 
+        let get_species = FunctionBuilder::new(context, Self::get_species)
+            .name("get [Symbol.species]")
+            .constructable(false)
+            .callable(true)
+            .build();
+
         let entries_function = FunctionBuilder::new(context, Self::entries)
             .name("entries")
             .length(0)
@@ -58,6 +64,12 @@ impl BuiltIn for Map {
         )
         .name(Self::NAME)
         .length(Self::LENGTH)
+        .static_accessor(
+            WellKnownSymbols::species(),
+            Some(get_species),
+            None,
+            Attribute::CONFIGURABLE,
+        )
         .property(
             "entries",
             entries_function.clone(),
@@ -160,6 +172,21 @@ impl Map {
         Ok(this)
     }
 
+    /// `get Map [ @@species ]`
+    ///
+    /// The Map[@@species] accessor property returns the Map constructor.
+    ///
+    /// More information:
+    ///  - [ECMAScript reference][spec]
+    ///  - [MDN documentation][mdn]
+    ///
+    /// [spec]: https://tc39.es/ecma262/#sec-get-map-@@species
+    /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/@@species
+    fn get_species(this: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+        // 1. Return the this value.
+        Ok(this.clone())
+    }
+
     /// `Map.prototype.entries()`
     ///
     /// Returns a new Iterator object that contains the [key, value] pairs for each element in the Map object in insertion order.

boa/src/builtins/set/mod.rs

@@ -39,12 +39,10 @@ impl BuiltIn for Set {
     fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
-        let species = WellKnownSymbols::species();
-
-        let species_getter = FunctionBuilder::new(context, Self::species_getter)
-            .callable(true)
-            .constructable(false)
+        let get_species = FunctionBuilder::new(context, Self::get_species)
             .name("get [Symbol.species]")
+            .constructable(false)
+            .callable(true)
             .build();
 
         let size_getter = FunctionBuilder::new(context, Self::size_getter)
@@ -71,7 +69,12 @@ impl BuiltIn for Set {
         )
         .name(Self::NAME)
         .length(Self::LENGTH)
-        .static_accessor(species, Some(species_getter), None, Attribute::CONFIGURABLE)
+        .static_accessor(
+            WellKnownSymbols::species(),
+            Some(get_species),
+            None,
+            Attribute::CONFIGURABLE,
+        )
         .method(Self::add, "add", 1)
         .method(Self::clear, "clear", 0)
         .method(Self::delete, "delete", 1)
@@ -178,13 +181,16 @@ impl Set {
 
     /// `get Set [ @@species ]`
     ///
-    /// get accessor for the @@species property of Set
+    /// The Set[Symbol.species] accessor property returns the Set constructor.
     ///
     /// More information:
     ///  - [ECMAScript reference][spec]
+    ///  - [MDN documentation][mdn]
     ///
     /// [spec]: https://tc39.es/ecma262/#sec-get-set-@@species
-    fn species_getter(this: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+    /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/@@species
+    fn get_species(this: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+        // 1. Return the this value.
         Ok(this.clone())
     }