Implement get RegExp[@@species] (#1326)

boa/src/builtins/regexp/mod.rs

@@ -72,6 +72,12 @@ impl BuiltIn for RegExp {
     fn init(context: &mut Context) -> (&'static str, Value, Attribute) {
         let _timer = BoaProfiler::global().start_event(Self::NAME, "init");
 
+        let get_species = FunctionBuilder::new(context, Self::get_species)
+            .name("get [Symbol.species]")
+            .constructable(false)
+            .callable(true)
+            .build();
+
         let flag_attributes = Attribute::CONFIGURABLE | Attribute::NON_ENUMERABLE;
 
         let get_global = FunctionBuilder::new(context, Self::get_global)
@@ -117,6 +123,12 @@ impl BuiltIn for RegExp {
         )
         .name(Self::NAME)
         .length(Self::LENGTH)
+        .static_accessor(
+            WellKnownSymbols::species(),
+            Some(get_species),
+            None,
+            Attribute::CONFIGURABLE,
+        )
         .property("lastIndex", 0, Attribute::all())
         .method(Self::test, "test", 1)
         .method(Self::exec, "exec", 1)
@@ -258,6 +270,21 @@ impl RegExp {
         Ok(this)
     }
 
+    /// `get RegExp[@@species]`
+    ///
+    /// The RegExp[@@species] accessor property returns the RegExp constructor.
+    ///
+    /// More information:
+    ///  - [ECMAScript reference][spec]
+    ///  - [MDN documentation][mdn]
+    ///
+    /// [spec]: https://tc39.es/ecma262/#sec-get-regexp-@@species
+    /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@species
+    fn get_species(this: &Value, _: &[Value], _: &mut Context) -> Result<Value> {
+        // 1. Return the this value.
+        Ok(this.clone())
+    }
+
     #[inline]
     fn regexp_has_flag(this: &Value, flag: char, context: &mut Context) -> Result<Value> {
         if let Some(object) = this.as_object() {

boa/src/builtins/regexp/tests.rs

@@ -15,6 +15,51 @@ fn constructors() {
     assert_eq!(forward(&mut context, "ctor_literal.test('1.0')"), "true");
 }
 
+#[test]
+fn species() {
+    let mut context = Context::new();
+
+    let init = r#"
+        var descriptor = Object.getOwnPropertyDescriptor(RegExp, Symbol.species);
+        var accessor = Object.getOwnPropertyDescriptor(RegExp, Symbol.species).get;
+        var name = Object.getOwnPropertyDescriptor(descriptor.get, "name");
+        var length = Object.getOwnPropertyDescriptor(descriptor.get, "length");
+        var thisVal = {};
+        "#;
+    eprintln!("{}", forward(&mut context, init));
+
+    // length
+    assert_eq!(forward(&mut context, "descriptor.get.length"), "0");
+    assert_eq!(forward(&mut context, "length.enumerable"), "false");
+    assert_eq!(forward(&mut context, "length.writable"), "false");
+    assert_eq!(forward(&mut context, "length.configurable"), "true");
+
+    // return-value
+    assert_eq!(
+        forward(&mut context, "Object.is(accessor.call(thisVal), thisVal)"),
+        "true"
+    );
+
+    // symbol-species-name
+    assert_eq!(
+        forward(&mut context, "descriptor.get.name"),
+        "\"get [Symbol.species]\""
+    );
+    assert_eq!(forward(&mut context, "name.enumerable"), "false");
+    assert_eq!(forward(&mut context, "name.writable"), "false");
+    assert_eq!(forward(&mut context, "name.configurable"), "true");
+
+    // symbol-species
+    assert_eq!(forward(&mut context, "descriptor.set"), "undefined");
+    assert_eq!(
+        forward(&mut context, "typeof descriptor.get"),
+        "\"function\""
+    );
+    assert_eq!(forward(&mut context, "descriptor.enumerable"), "false");
+    assert_eq!(forward(&mut context, "descriptor.writable"), "false");
+    assert_eq!(forward(&mut context, "descriptor.configurable"), "true");
+}
+
 // TODO: uncomment this test when property getters are supported
 
 //    #[test]