| // 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); |
| |
| // No symbol properties, at least until we have @@toStringTag. |
| assertEq(Object.getOwnPropertySymbols(GeneratorObjectPrototype).length, 0); |
| } |
| 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); |