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// This file was written by Andy Wingo <wingo@igalia.com> and originally
// contributed to V8 as generators-runtime.js, available here:
//
// http://code.google.com/p/v8/source/browse/branches/bleeding_edge/test/mjsunit/harmony/generators-runtime.js
// Test aspects of the generator runtime.
// See http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.19.3.
function assertSyntaxError(str) {
assertThrowsInstanceOf(Function(str), SyntaxError);
}
function f() { }
function* g() { yield 1; }
var GeneratorFunctionPrototype = Object.getPrototypeOf(g);
var GeneratorFunction = GeneratorFunctionPrototype.constructor;
var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
// A generator function should have the same set of properties as any
// other function.
function TestGeneratorFunctionInstance() {
var f_own_property_names = Object.getOwnPropertyNames(f);
var g_own_property_names = Object.getOwnPropertyNames(g);
f_own_property_names.sort();
g_own_property_names.sort();
assertDeepEq(f_own_property_names, g_own_property_names);
var i;
for (i = 0; i < f_own_property_names.length; i++) {
var prop = f_own_property_names[i];
var f_desc = Object.getOwnPropertyDescriptor(f, prop);
var g_desc = Object.getOwnPropertyDescriptor(g, prop);
assertEq(f_desc.configurable, g_desc.configurable, prop);
assertEq(f_desc.writable, g_desc.writable, prop);
assertEq(f_desc.enumerable, g_desc.enumerable, prop);
}
}
TestGeneratorFunctionInstance();
// Generators have an additional object interposed in the chain between
// themselves and Function.prototype.
function TestGeneratorFunctionPrototype() {
// Sanity check.
assertEq(Object.getPrototypeOf(f), Function.prototype);
assertNotEq(GeneratorFunctionPrototype, Function.prototype);
assertEq(Object.getPrototypeOf(GeneratorFunctionPrototype),
Function.prototype);
assertEq(Object.getPrototypeOf(function* () {}),
GeneratorFunctionPrototype);
}
TestGeneratorFunctionPrototype();
// Functions that we associate with generator objects are actually defined by
// a common prototype.
function TestGeneratorObjectPrototype() {
// %GeneratorPrototype% must inherit from %IteratorPrototype%.
var iterProto = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()));
assertEq(Object.getPrototypeOf(GeneratorObjectPrototype),
iterProto);
assertEq(Object.getPrototypeOf((function*(){yield 1}).prototype),
GeneratorObjectPrototype);
var expected_property_names = ["next", "return", "throw", "constructor"];
var found_property_names =
Object.getOwnPropertyNames(GeneratorObjectPrototype);
expected_property_names.sort();
found_property_names.sort();
assertDeepEq(found_property_names, expected_property_names);
assertDeepEq(Object.getOwnPropertySymbols(GeneratorObjectPrototype), [Symbol.toStringTag]);
}
TestGeneratorObjectPrototype();
// This tests the object that would be called "GeneratorFunction", if it were
// like "Function".
function TestGeneratorFunction() {
assertEq(GeneratorFunctionPrototype, GeneratorFunction.prototype);
assertTrue(g instanceof GeneratorFunction);
assertEq(Function, Object.getPrototypeOf(GeneratorFunction));
assertTrue(g instanceof Function);
assertEq("function* g() { yield 1; }", g.toString());
// Not all functions are generators.
assertTrue(f instanceof Function); // Sanity check.
assertFalse(f instanceof GeneratorFunction);
assertTrue((new GeneratorFunction()) instanceof GeneratorFunction);
assertTrue(GeneratorFunction() instanceof GeneratorFunction);
assertTrue(GeneratorFunction('yield 1') instanceof GeneratorFunction);
assertTrue(GeneratorFunction('return 1') instanceof GeneratorFunction);
assertTrue(GeneratorFunction('a', 'yield a') instanceof GeneratorFunction);
assertTrue(GeneratorFunction('a', 'return a') instanceof GeneratorFunction);
assertTrue(GeneratorFunction('a', 'return a') instanceof GeneratorFunction);
assertSyntaxError("GeneratorFunction('yield', 'return yield')");
assertTrue(GeneratorFunction('with (x) return foo;') instanceof GeneratorFunction);
assertSyntaxError("GeneratorFunction('\"use strict\"; with (x) return foo;')");
// Doesn't matter particularly what string gets serialized, as long
// as it contains "function*" and "yield 10".
assertEq(GeneratorFunction('yield 10').toString(),
"function* anonymous() {\nyield 10\n}");
}
TestGeneratorFunction();
function TestPerGeneratorPrototype() {
assertNotEq((function*(){}).prototype, (function*(){}).prototype);
assertNotEq((function*(){}).prototype, g.prototype);
assertEq(typeof GeneratorFunctionPrototype, "object");
assertEq(g.prototype.__proto__.constructor, GeneratorFunctionPrototype, "object");
assertEq(Object.getPrototypeOf(g.prototype), GeneratorObjectPrototype);
assertFalse(g.prototype instanceof Function);
assertEq(typeof (g.prototype), "object");
assertDeepEq(Object.getOwnPropertyNames(g.prototype), []);
}
TestPerGeneratorPrototype();
if (typeof reportCompare == "function")
reportCompare(true, true);
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