Libraries: Move to Userland/Libraries/

Userland/Libraries/LibJS/Tests/classes/class-advanced-extends.js

@@ -0,0 +1,35 @@
+test("extending function", () => {
+    class A extends function () {
+        this.foo = 10;
+    } {}
+
+    expect(new A().foo).toBe(10);
+});
+
+test("extending null", () => {
+    class A extends null {}
+
+    expect(Object.getPrototypeOf(A.prototype)).toBeNull();
+
+    expect(() => {
+        new A();
+    }).toThrowWithMessage(ReferenceError, "|this| has not been initialized");
+});
+
+test("extending String", () => {
+    class MyString extends String {}
+
+    const ms = new MyString("abc");
+    expect(ms).toBeInstanceOf(MyString);
+    expect(ms).toBeInstanceOf(String);
+    expect(ms.charAt(1)).toBe("b");
+
+    class MyString2 extends MyString {
+        charAt(i) {
+            return `#${super.charAt(i)}`;
+        }
+    }
+
+    const ms2 = new MyString2("abc");
+    expect(ms2.charAt(1)).toBe("#b");
+});

Userland/Libraries/LibJS/Tests/classes/class-basic.js

@@ -0,0 +1,5 @@
+test("class properties", () => {
+    class A {}
+    expect(A.name).toBe("A");
+    expect(A).toHaveLength(0);
+});

Userland/Libraries/LibJS/Tests/classes/class-constructor.js

@@ -0,0 +1,67 @@
+test("property initialization", () => {
+    class A {
+        constructor() {
+            this.x = 3;
+        }
+    }
+
+    expect(new A().x).toBe(3);
+});
+
+test("method initialization", () => {
+    class A {
+        constructor() {
+            this.x = () => 10;
+        }
+    }
+
+    expect(new A().x()).toBe(10);
+});
+
+test("initialize to class method", () => {
+    class A {
+        constructor() {
+            this.x = this.method;
+        }
+
+        method() {
+            return 10;
+        }
+    }
+
+    expect(new A().x()).toBe(10);
+});
+
+test("constructor length affects class length", () => {
+    class A {
+        constructor() {}
+    }
+
+    expect(A).toHaveLength(0);
+
+    class B {
+        constructor(a, b, c = 2) {}
+    }
+
+    expect(B).toHaveLength(2);
+});
+
+test("must be invoked with 'new'", () => {
+    class A {
+        constructor() {}
+    }
+
+    expect(() => {
+        A();
+    }).toThrowWithMessage(TypeError, "Class constructor A must be called with 'new'");
+
+    expect(() => {
+        A.prototype.constructor();
+    }).toThrowWithMessage(TypeError, "Class constructor A must be called with 'new'");
+});
+
+test("implicit constructor", () => {
+    class A {}
+
+    expect(new A()).toBeInstanceOf(A);
+});

Userland/Libraries/LibJS/Tests/classes/class-errors.js

@@ -0,0 +1,100 @@
+describe("non-syntax errors", () => {
+    test("super reference inside nested-but-same |this| scope with no base class", () => {
+        expect(`
+    class A {
+      foo() {
+        () => { super.bar; }
+      }
+    }`).toEval();
+    });
+
+    test("super reference property lookup with no base class", () => {
+        expect(`
+    class A {
+      constructor() {
+        super.foo;
+      }
+    }`).toEval();
+    });
+});
+
+describe("reference errors", () => {
+    test("derived class doesn't call super in constructor before using this", () => {
+        class Parent {}
+        class Child extends Parent {
+            constructor() {
+                this;
+            }
+        }
+
+        expect(() => {
+            new Child();
+        }).toThrowWithMessage(ReferenceError, "|this| has not been initialized");
+    });
+
+    test("derived class calls super twice in constructor", () => {
+        class Parent {}
+        class Child extends Parent {
+            constructor() {
+                super();
+                super();
+            }
+        }
+
+        expect(() => {
+            new Child();
+        }).toThrowWithMessage(ReferenceError, "|this| is already initialized");
+    });
+});
+
+describe("syntax errors", () => {
+    test("getter with argument", () => {
+        expect(`
+    class A {
+      get foo(v) {
+        return 0;
+      }
+    }`).not.toEval();
+    });
+
+    test("setter with no arguments", () => {
+        expect(`
+    class A {
+      set foo() {
+      }
+    }`).not.toEval();
+    });
+
+    test("setter with more than one argument", () => {
+        expect(`
+    class A {
+      set foo(bar, baz) {
+      }
+    }`).not.toEval();
+        expect(`
+    class A {
+      set foo(...bar) {
+      }
+    }`).not.toEval();
+    });
+
+    test("super reference inside different |this| scope", () => {
+        expect(`
+    class Parent {}
+
+    class Child extends Parent {
+      foo() {
+        function f() { super.foo; }
+      }
+    }`).not.toEval();
+    });
+
+    test("super reference call with no base class", () => {
+        expect(`
+    class A {
+      constructor() {
+        super();
+      }
+    }`).not.toEval();
+    });
+});

Userland/Libraries/LibJS/Tests/classes/class-expressions.js

@@ -0,0 +1,68 @@
+test("basic functionality", () => {
+    const A = class {
+        constructor(x) {
+            this.x = x;
+        }
+
+        getX() {
+            return this.x * 2;
+        }
+    };
+
+    expect(new A(10).getX()).toBe(20);
+});
+
+test("inline instantiation", () => {
+    // prettier-ignore
+    const a = new class {
+        constructor() {
+            this.x = 10;
+        }
+
+        getX() {
+            return this.x * 2;
+        }
+    };
+
+    expect(a.getX()).toBe(20);
+});
+
+test("inline instantiation with argument", () => {
+    // prettier-ignore
+    const a = new class {
+        constructor(x) {
+            this.x = x;
+        }
+
+        getX() {
+            return this.x * 2;
+        }
+    }(10);
+
+    expect(a.getX()).toBe(20);
+});
+
+test("extending class expressions", () => {
+    class A extends class {
+        constructor(x) {
+            this.x = x;
+        }
+    } {
+        constructor(y) {
+            super(y);
+            this.y = y * 2;
+        }
+    }
+
+    const a = new A(10);
+    expect(a.x).toBe(10);
+    expect(a.y).toBe(20);
+});
+
+test("class expression name", () => {
+    let A = class {};
+    expect(A.name).toBe("A");
+
+    let B = class C {};
+    expect(B.name).toBe("C");
+});

Userland/Libraries/LibJS/Tests/classes/class-getters.js

@@ -0,0 +1,75 @@
+test("basic functionality", () => {
+    class A {
+        get x() {
+            return 10;
+        }
+    }
+
+    expect(A).not.toHaveProperty("x");
+    expect(new A().x).toBe(10);
+});
+test("name", () => {
+    class A {
+        get x() {}
+    }
+
+    const d = Object.getOwnPropertyDescriptor(A.prototype, "x");
+    expect(d.get.name).toBe("get x");
+});
+
+test("extended name syntax", () => {
+    const s = Symbol("foo");
+
+    class A {
+        get "method with space"() {
+            return 1;
+        }
+
+        get 12() {
+            return 2;
+        }
+
+        get [`he${"llo"}`]() {
+            return 3;
+        }
+
+        get [s]() {
+            return 4;
+        }
+    }
+
+    const a = new A();
+    expect(a["method with space"]).toBe(1);
+    expect(a[12]).toBe(2);
+    expect(a.hello).toBe(3);
+    expect(a[s]).toBe(4);
+});
+
+test("inherited getter", () => {
+    class Parent {
+        get x() {
+            return 3;
+        }
+    }
+
+    class Child extends Parent {}
+
+    expect(Child).not.toHaveProperty("x");
+    expect(new Child().x).toBe(3);
+});
+
+test("inherited getter overriding", () => {
+    class Parent {
+        get x() {
+            return 3;
+        }
+    }
+
+    class Child extends Parent {
+        get x() {
+            return 10;
+        }
+    }
+
+    expect(new Child().x).toBe(10);
+});

Userland/Libraries/LibJS/Tests/classes/class-inheritance.js

@@ -0,0 +1,133 @@
+test("method inheritance", () => {
+    class Parent {
+        method() {
+            return 3;
+        }
+    }
+
+    class Child extends Parent {}
+
+    const p = new Parent();
+    const c = new Child();
+    expect(p.method()).toBe(3);
+    expect(c.method()).toBe(3);
+});
+
+test("method overriding", () => {
+    class Parent {
+        method() {
+            return 3;
+        }
+    }
+
+    class Child extends Parent {
+        method() {
+            return 10;
+        }
+    }
+
+    const p = new Parent();
+    const c = new Child();
+    expect(p.method()).toBe(3);
+    expect(c.method()).toBe(10);
+});
+
+test("parent method reference with super", () => {
+    class Parent {
+        method() {
+            return 3;
+        }
+    }
+
+    class Child extends Parent {
+        method() {
+            return super.method() * 2;
+        }
+    }
+
+    const p = new Parent();
+    const c = new Child();
+    expect(p.method()).toBe(3);
+    expect(c.method()).toBe(6);
+});
+
+test("child class access to parent class initialized properties", () => {
+    class Parent {
+        constructor() {
+            this.x = 3;
+        }
+    }
+
+    class Child extends Parent {}
+
+    const p = new Parent();
+    const c = new Child();
+    expect(p.x).toBe(3);
+    expect(c.x).toBe(3);
+});
+
+test("child class modification of parent class properties", () => {
+    class Parent {
+        constructor() {
+            this.x = 3;
+        }
+    }
+
+    class Child extends Parent {
+        change() {
+            this.x = 10;
+        }
+    }
+
+    const p = new Parent();
+    const c = new Child();
+    expect(p.x).toBe(3);
+    expect(c.x).toBe(3);
+
+    c.change();
+    expect(c.x).toBe(10);
+});
+
+test("inheritance and hasOwnProperty", () => {
+    class Parent {
+        constructor() {
+            this.x = 3;
+        }
+    }
+
+    class Child extends Parent {
+        method() {
+            this.y = 10;
+        }
+    }
+
+    const p = new Parent();
+    const c = new Child();
+    expect(p.hasOwnProperty("x")).toBeTrue();
+    expect(p.hasOwnProperty("y")).toBeFalse();
+    expect(c.hasOwnProperty("x")).toBeTrue();
+    expect(c.hasOwnProperty("y")).toBeFalse();
+
+    c.method();
+    expect(c.hasOwnProperty("x")).toBeTrue();
+    expect(c.hasOwnProperty("y")).toBeTrue();
+});
+
+test("super constructor call from child class with argument", () => {
+    class Parent {
+        constructor(x) {
+            this.x = x;
+        }
+    }
+
+    class Child extends Parent {
+        constructor() {
+            super(10);
+        }
+    }
+
+    const p = new Parent(3);
+    const c = new Child(3);
+    expect(p.x).toBe(3);
+    expect(c.x).toBe(10);
+});

Userland/Libraries/LibJS/Tests/classes/class-methods.js

@@ -0,0 +1,51 @@
+test("basic functionality", () => {
+    class A {
+        number() {
+            return 2;
+        }
+
+        string() {
+            return "foo";
+        }
+    }
+
+    const a = new A();
+    expect(a.number()).toBe(2);
+    expect(a.string()).toBe("foo");
+});
+
+test("length", () => {
+    class A {
+        method1() {}
+
+        method2(a, b, c, d) {}
+
+        method3(a, b, ...c) {}
+    }
+
+    const a = new A();
+    expect(a.method1).toHaveLength(0);
+    expect(a.method2).toHaveLength(4);
+    expect(a.method3).toHaveLength(2);
+});
+
+test("extended name syntax", () => {
+    class A {
+        "method with space"() {
+            return 1;
+        }
+
+        12() {
+            return 2;
+        }
+
+        [`he${"llo"}`]() {
+            return 3;
+        }
+    }
+
+    const a = new A();
+    expect(a["method with space"]()).toBe(1);
+    expect(a[12]()).toBe(2);
+    expect(a.hello()).toBe(3);
+});

Userland/Libraries/LibJS/Tests/classes/class-setters.js

@@ -0,0 +1,108 @@
+test("basic functionality", () => {
+    class A {
+        get x() {
+            return this._x;
+        }
+
+        set x(value) {
+            this._x = value * 2;
+        }
+    }
+
+    expect(A.x).toBeUndefined();
+    expect(A).not.toHaveProperty("_x");
+    const a = new A();
+    expect(a.x).toBeUndefined();
+    expect(a).not.toHaveProperty("_x");
+    a.x = 3;
+    expect(a.x).toBe(6);
+    expect(a).toHaveProperty("_x", 6);
+});
+
+test("name", () => {
+    class A {
+        set x(v) {}
+    }
+
+    const d = Object.getOwnPropertyDescriptor(A.prototype, "x");
+    expect(d.set.name).toBe("set x");
+});
+
+test("extended name syntax", () => {
+    const s = Symbol("foo");
+
+    class A {
+        set "method with space"(value) {
+            this.a = value;
+        }
+
+        set 12(value) {
+            this.b = value;
+        }
+
+        set [`he${"llo"}`](value) {
+            this.c = value;
+        }
+
+        set [s](value) {
+            this.d = value;
+        }
+    }
+
+    const a = new A();
+    a["method with space"] = 1;
+    a[12] = 2;
+    a.hello = 3;
+    a[s] = 4;
+    expect(a.a).toBe(1);
+    expect(a.b).toBe(2);
+    expect(a.c).toBe(3);
+    expect(a.d).toBe(4);
+});
+
+test("inherited setter", () => {
+    class Parent {
+        get x() {
+            return this._x;
+        }
+
+        set x(value) {
+            this._x = value * 2;
+        }
+    }
+
+    class Child extends Parent {}
+
+    const c = new Child();
+
+    expect(c.x).toBeUndefined();
+    c.x = 10;
+    expect(c.x).toBe(20);
+});
+
+test("inherited static setter overriding", () => {
+    class Parent {
+        get x() {
+            return this._x;
+        }
+
+        set x(value) {
+            this._x = value * 2;
+        }
+    }
+
+    class Child extends Parent {
+        get x() {
+            return this._x;
+        }
+
+        set x(value) {
+            this._x = value * 3;
+        }
+    }
+
+    const c = new Child();
+    expect(c.x).toBeUndefined();
+    c.x = 10;
+    expect(c.x).toBe(30);
+});

Userland/Libraries/LibJS/Tests/classes/class-static-getters.js

@@ -0,0 +1,87 @@
+describe("correct behavior", () => {
+    test("basic functionality", () => {
+        class A {
+            static get x() {
+                return 10;
+            }
+        }
+
+        expect(A.x).toBe(10);
+        expect(new A()).not.toHaveProperty("x");
+    });
+
+    test("name", () => {
+        class A {
+            static get x() {}
+        }
+
+        const d = Object.getOwnPropertyDescriptor(A, "x");
+        expect(d.get.name).toBe("get x");
+    });
+
+    test("extended name syntax", () => {
+        const s = Symbol("foo");
+
+        class A {
+            static get "method with space"() {
+                return 1;
+            }
+
+            static get 12() {
+                return 2;
+            }
+
+            static get [`he${"llo"}`]() {
+                return 3;
+            }
+
+            static get [s]() {
+                return 4;
+            }
+        }
+
+        expect(A["method with space"]).toBe(1);
+        expect(A[12]).toBe(2);
+        expect(A.hello).toBe(3);
+        expect(A[s]).toBe(4);
+    });
+
+    test("inherited static getter", () => {
+        class Parent {
+            static get x() {
+                return 3;
+            }
+        }
+
+        class Child extends Parent {}
+
+        expect(Parent.x).toBe(3);
+        expect(Child.x).toBe(3);
+    });
+
+    test("inherited static getter overriding", () => {
+        class Parent {
+            static get x() {
+                return 3;
+            }
+        }
+
+        class Child extends Parent {
+            static get x() {
+                return 10;
+            }
+        }
+
+        expect(Parent.x).toBe(3);
+        expect(Child.x).toBe(10);
+    });
+});
+
+describe("errors", () => {
+    test('"get static" is a syntax error', () => {
+        expect(`
+    class A {
+      get static foo() {}
+    }`).not.toEval();
+    });
+});

Userland/Libraries/LibJS/Tests/classes/class-static-setters.js

@@ -0,0 +1,112 @@
+describe("correct behavior", () => {
+    test("basic functionality", () => {
+        class A {
+            static get x() {
+                return this._x;
+            }
+
+            static set x(value) {
+                this._x = value * 2;
+            }
+        }
+
+        expect(A.x).toBeUndefined();
+        expect(A).not.toHaveProperty("_x");
+        A.x = 3;
+        expect(A.x).toBe(6);
+        expect(A).toHaveProperty("_x", 6);
+    });
+
+    test("name", () => {
+        class A {
+            static set x(v) {}
+        }
+
+        const d = Object.getOwnPropertyDescriptor(A, "x");
+        expect(d.set.name).toBe("set x");
+    });
+
+    test("extended name syntax", () => {
+        const s = Symbol("foo");
+
+        class A {
+            static set "method with space"(value) {
+                this.a = value;
+            }
+
+            static set 12(value) {
+                this.b = value;
+            }
+
+            static set [`he${"llo"}`](value) {
+                this.c = value;
+            }
+
+            static set [s](value) {
+                this.d = value;
+            }
+        }
+
+        A["method with space"] = 1;
+        A[12] = 2;
+        A.hello = 3;
+        A[s] = 4;
+        expect(A.a).toBe(1);
+        expect(A.b).toBe(2);
+        expect(A.c).toBe(3);
+        expect(A.d).toBe(4);
+    });
+
+    test("inherited static setter", () => {
+        class Parent {
+            static get x() {
+                return this._x;
+            }
+
+            static set x(value) {
+                this._x = value * 2;
+            }
+        }
+
+        class Child extends Parent {}
+
+        expect(Child.x).toBeUndefined();
+        Child.x = 10;
+        expect(Child.x).toBe(20);
+    });
+
+    test("inherited static setter overriding", () => {
+        class Parent {
+            static get x() {
+                return this._x;
+            }
+
+            static set x(value) {
+                this._x = value * 2;
+            }
+        }
+
+        class Child extends Parent {
+            static get x() {
+                return this._x;
+            }
+
+            static set x(value) {
+                this._x = value * 3;
+            }
+        }
+
+        expect(Child.x).toBeUndefined();
+        Child.x = 10;
+        expect(Child.x).toBe(30);
+    });
+});
+
+describe("errors", () => {
+    test('"set static" is a syntax error', () => {
+        expect(`
+    class A {
+      set static foo(value) {}
+    }`).not.toEval();
+    });
+});

Userland/Libraries/LibJS/Tests/classes/class-static.js

@@ -0,0 +1,72 @@
+test("basic functionality", () => {
+    class A {
+        static method() {
+            return 10;
+        }
+    }
+
+    expect(A.method()).toBe(10);
+    expect(new A().method).toBeUndefined();
+});
+
+test("extended name syntax", () => {
+    class A {
+        static method() {
+            return 1;
+        }
+
+        static 12() {
+            return 2;
+        }
+
+        static [`he${"llo"}`]() {
+            return 3;
+        }
+    }
+
+    expect(A.method()).toBe(1);
+    expect(A[12]()).toBe(2);
+    expect(A.hello()).toBe(3);
+});
+
+test("bound |this|", () => {
+    class A {
+        static method() {
+            expect(this).toBe(A);
+        }
+    }
+
+    A.method();
+});
+
+test("inherited static methods", () => {
+    class Parent {
+        static method() {
+            return 3;
+        }
+    }
+
+    class Child extends Parent {}
+
+    expect(Parent.method()).toBe(3);
+    expect(Child.method()).toBe(3);
+    expect(new Parent()).not.toHaveProperty("method");
+    expect(new Child()).not.toHaveProperty("method");
+});
+
+test("static method overriding", () => {
+    class Parent {
+        static method() {
+            return 3;
+        }
+    }
+
+    class Child extends Parent {
+        static method() {
+            return 10;
+        }
+    }
+
+    expect(Parent.method()).toBe(3);
+    expect(Child.method()).toBe(10);
+});

Userland/Libraries/LibJS/Tests/classes/class-strict-mode.js

@@ -0,0 +1,19 @@
+test("constructors are always strict mode", () => {
+    class A {
+        constructor() {
+            expect(isStrictMode()).toBeTrue();
+        }
+    }
+
+    new A();
+});
+
+test("methods are always strict mode", () => {
+    class A {
+        method() {
+            expect(isStrictMode()).toBeTrue();
+        }
+    }
+
+    new A().method();
+});