syntax.js - mozsearch

var BUGNUMBER = 1185106;

var summary = "async/await syntax";

print(BUGNUMBER + ": " + summary);

if (typeof Reflect !== "undefined" && Reflect.parse) {

    assertEq(Reflect.parse("function a() {}").body[0].async, false);

    assertEq(Reflect.parse("function* a() {}").body[0].async, false);

    assertEq(Reflect.parse("async function a() {}").body[0].async, true);

    assertEq(Reflect.parse("() => {}").body[0].async, undefined);

    // No line terminator after async

    assertEq(Reflect.parse("async\nfunction a(){}").body[0].expression.name, "async");

    // Async function expressions

    assertEq(Reflect.parse("(async function() {})()").body[0].expression.callee.async, true);

    assertEq(Reflect.parse("var k = async function() {}").body[0].declarations[0].init.async, true);

    assertEq(Reflect.parse("var nmd = async function named() {}").body[0].declarations[0].init.id.name, "named");

    // `await` handling for function declaration name inherits.

    assertEq(Reflect.parse("async function await() {}").body[0].id.name, "await");

    assertThrowsInstanceOf(() => Reflect.parse("async function f() { async function await() {} }"), SyntaxError);

    // `await` is not allowed in function expression name.

    assertThrowsInstanceOf(() => Reflect.parse("(async function await() {})"), SyntaxError);

    // Awaiting not directly inside an async function is not allowed

    assertThrowsInstanceOf(() => Reflect.parse("await 4;"), SyntaxError);

    assertThrowsInstanceOf(() => Reflect.parse("function a() { await 4; }"), SyntaxError);

    assertThrowsInstanceOf(() => Reflect.parse("function* a() { await 4; }"), SyntaxError);

    assertThrowsInstanceOf(() => Reflect.parse("async function k() { function a() { await 4; } }"), SyntaxError);

    // Await is not allowed as a default expr.

    assertThrowsInstanceOf(() => Reflect.parse("async function a(k = await 3) {}"), SyntaxError);

    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b(k = await 3) {} }"), SyntaxError);

    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b(k = [await 3]) {} }"), SyntaxError);

    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b([k = await 3]) {} }"), SyntaxError);

    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b([k = [await 3]]) {} }"), SyntaxError);

    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b({k = await 3}) {} }"), SyntaxError);

    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b({k = [await 3]}) {} }"), SyntaxError);

    // Await is not legal as an identifier in an async function.

    assertThrowsInstanceOf(() => Reflect.parse("async function a() { var await = 4; }"), SyntaxError);

    assertThrowsInstanceOf(() => Reflect.parse("async function a() { return await; }"), SyntaxError);

    // Await is still available as an identifier name in strict mode code.

    Reflect.parse("function a() { 'use strict'; var await = 3; }");

    Reflect.parse("'use strict'; var await = 3;");

    // Await is treated differently depending on context. Various cases.

    Reflect.parse("var await = 3; async function a() { await 4; }");

    Reflect.parse("async function a() { await 4; } var await = 5");

    Reflect.parse("async function a() { function b() { return await; } }");

    Reflect.parse("async function a() { var k = { async: 4 } }");

    Reflect.parse("function a() { await: 4 }");

    assertEq(Reflect.parse("async function a() { await 4; }")

        .body[0].body.body[0].expression.operator, "await");

    assertEq(Reflect.parse("async function a() { async function b() { await 4; } }")

        .body[0].body.body[0].body.body[0].expression.operator, "await");

    // operator priority test

    assertEq(Reflect.parse("async function a() { await 2 + 3; }")

        .body[0].body.body[0].expression.left.argument.value, 2);

    assertEq(Reflect.parse("async function a() { await 2 + 3; }")

        .body[0].body.body[0].expression.left.operator, "await");

    assertEq(Reflect.parse("async function a() { await 2 + 3; }")

        .body[0].body.body[0].expression.right.value, 3);

    // blocks and other constructions

    assertEq(Reflect.parse("{ async function a() { return 2; } }")

        .body[0].body[0].async, true);

    // Async function expression is primary expression.

    Reflect.parse("(async function a() {}.constructor)");

if (typeof reportCompare === "function")

    reportCompare(true, true);