[es6] implement spread calls

test/mjsunit/harmony/spread-call.js

Index: test/mjsunit/harmony/spread-call.js
diff --git a/test/mjsunit/harmony/spread-call.js b/test/mjsunit/harmony/spread-call.js
new file mode 100644
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+++ b/test/mjsunit/harmony/spread-call.js
@@ -0,0 +1,374 @@
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-spreadcalls
+
+(function testSpreadCallsStrict() {
+  "use strict"
+  function countArgs() { return arguments.length; }
+
+  // Test this argument
+  function returnThis() { return this; }
+  assertEquals(void 0, returnThis(..."test"));
+
+  // Test argument counting with different iterables
+  assertEquals(0, countArgs(...""));
+  assertEquals(4, countArgs(..."test"));
+  assertEquals(4, countArgs(..."tes", ..."t"));
+  assertEquals(4, countArgs("t", ..."es", "t"));
+  assertEquals(4, countArgs("tes", ..."t!!"));
+
+  assertEquals(1, countArgs(...[1]));
+  assertEquals(2, countArgs(...[1, 2]));
+  assertEquals(3, countArgs(...[1, 2, 3]));
+  assertEquals(4, countArgs(...[1, 2, 3, 4]));
+  assertEquals(5, countArgs(...[1, 2, 3, 4, 5]));
+  assertEquals(6, countArgs(...[1, 2, 3, 4, 5, 6]));
+
+  assertEquals(1, countArgs(...new Set([1])));
+  assertEquals(2, countArgs(...new Set([1, 2])));
+  assertEquals(3, countArgs(...new Set([1, 2, 3])));
+  assertEquals(4, countArgs(...new Set([1, 2, 3, 4])));
+  assertEquals(5, countArgs(...new Set([1, 2, 3, 4, 5])));
+  assertEquals(6, countArgs(...new Set([1, 2, 3, 4, 5, 6])));
+
+  assertEquals(3, countArgs(...(function*(){ yield 1; yield 2; yield 3; })()));
+
+  // Test values
+  function sum() {
+    var sum = arguments[0];
+    for (var i = 1; i < arguments.length; ++i) {
+      sum += arguments[i];
+    }
+    return sum;
+  }
+
+  assertEquals(void 0, sum(...""));
+  assertEquals(void 0, sum(...[]));
+  assertEquals(void 0, sum(...new Set));
+  assertEquals(void 0, sum(...(function*() { })()));
+
+  assertEquals("test", sum(..."test"));
+  assertEquals(10, sum(...[1, 2, 3, 4]));
+  assertEquals(10, sum(...[1, 2, 3], 4));
+  assertEquals(10, sum(1, ...[2, 3], 4));
+  assertEquals(10, sum(1, ...[2, 3], ...[4]));
+  assertEquals(10, sum(1, 2, ...[3, 4]));
+  assertEquals(10, sum(...new Set([1, 2, 3, 4])));
+  assertEquals(10, sum(...(function*() {
+    yield 1;
+    yield 2;
+    yield 3;
+    yield 4;
+  })()));
+
+  // nested spreads
+  function makeArray() {
+    var result = [];
+    for (var i = 0; i < arguments.length; ++i) {
+      result.push(arguments[i]);
+    }
+    return result;
+  }
+  assertEquals(10, sum(...makeArray(...[1, 2, 3, 4])));
+  assertEquals("test!!!", sum(...makeArray(..."test!!!")));
+
+  // Interleaved spread/unspread args
+  assertEquals(36, sum(0, ...[1], 2, 3, ...[4, 5], 6, 7, 8));
+  assertEquals(45, sum(0, ...[1], 2, 3, ...[4, 5], 6, 7, 8, ...[9]));
+
+  // Methods
+  var O = {
+    returnThis: returnThis,
+    countArgs: countArgs,
+    sum: sum,
+    makeArray: makeArray,
+
+    nested: {
+      returnThis: returnThis,
+      countArgs: countArgs,
+      sum: sum,
+      makeArray: makeArray
+    }
+  };
+
+  // Test this argument
+  assertEquals(O, O.returnThis(..."test"));
+  assertEquals(O, O["returnThis"](..."test"));
+  assertEquals(O.nested, O.nested.returnThis(..."test"));
+  assertEquals(O.nested, O.nested["returnThis"](..."test"));
+
+  // Test argument counting with different iterables
+  assertEquals(0, O.countArgs(...""));
+  assertEquals(4, O.countArgs(..."test"));
+  assertEquals(4, O.countArgs(..."tes", ..."t"));
+  assertEquals(4, O.countArgs("t", ..."es", "t"));
+  assertEquals(4, O.countArgs("tes", ..."t!!"));
+
+  assertEquals(1, O.countArgs(...[1]));
+  assertEquals(2, O.countArgs(...[1, 2]));
+  assertEquals(3, O.countArgs(...[1, 2, 3]));
+  assertEquals(4, O.countArgs(...[1, 2, 3, 4]));
+  assertEquals(5, O.countArgs(...[1, 2, 3, 4, 5]));
+  assertEquals(6, O.countArgs(...[1, 2, 3, 4, 5, 6]));
+
+  assertEquals(1, O.countArgs(...new Set([1])));
+  assertEquals(2, O.countArgs(...new Set([1, 2])));
+  assertEquals(3, O.countArgs(...new Set([1, 2, 3])));
+  assertEquals(4, O.countArgs(...new Set([1, 2, 3, 4])));
+  assertEquals(5, O.countArgs(...new Set([1, 2, 3, 4, 5])));
+  assertEquals(6, O.countArgs(...new Set([1, 2, 3, 4, 5, 6])));
+
+  assertEquals(3, O.countArgs(
+      ...(function*(){ yield 1; yield 2; yield 3; })()));
+
+  // Test values
+  assertEquals(void 0, O.sum(...""));
+  assertEquals(void 0, O.sum(...[]));
+  assertEquals(void 0, O.sum(...new Set));
+  assertEquals(void 0, O.sum(...(function*() { })()));
+
+  assertEquals("test", O.sum(..."test"));
+  assertEquals(10, O.sum(...[1, 2, 3, 4]));
+  assertEquals(10, O.sum(...[1, 2, 3], 4));
+  assertEquals(10, O.sum(1, ...[2, 3], 4));
+  assertEquals(10, O.sum(1, ...[2, 3], ...[4]));
+  assertEquals(10, O.sum(1, 2, ...[3, 4]));
+  assertEquals(10, O.sum(...new Set([1, 2, 3, 4])));
+  assertEquals(10, O.sum(...(function*() {
+    yield 1;
+    yield 2;
+    yield 3;
+    yield 4;
+  })()));
+
+  // nested spreads
+  assertEquals(10, O.sum(...O.makeArray(...[1, 2, 3, 4])));
+  assertEquals("test!!!", O.sum(...O.makeArray(..."test!!!")));
+
+  // Interleaved spread/unspread args
+  assertEquals(36, O.sum(0, ...[1], 2, 3, ...[4, 5], 6, 7, 8));
+  assertEquals(45, O.sum(0, ...[1], 2, 3, ...[4, 5], 6, 7, 8, ...[9]));
+})();
+
+
+(function testSpreadCallsSloppy() {
+  // Test this argument
+  function returnThis() { return this; }
+  assertEquals(this, returnThis(..."test"));
+
+  function countArgs() { return arguments.length; }
+
+  // Test argument counting with different iterables
+  assertEquals(0, countArgs(...""));
+  assertEquals(4, countArgs(..."test"));
+  assertEquals(4, countArgs(..."tes", ..."t"));
+  assertEquals(4, countArgs("t", ..."es", "t"));
+  assertEquals(4, countArgs("tes", ..."t!!"));
+
+  assertEquals(1, countArgs(...[1]));
+  assertEquals(2, countArgs(...[1, 2]));
+  assertEquals(3, countArgs(...[1, 2, 3]));
+  assertEquals(4, countArgs(...[1, 2, 3, 4]));
+  assertEquals(5, countArgs(...[1, 2, 3, 4, 5]));
+  assertEquals(6, countArgs(...[1, 2, 3, 4, 5, 6]));
+
+  assertEquals(1, countArgs(...new Set([1])));
+  assertEquals(2, countArgs(...new Set([1, 2])));
+  assertEquals(3, countArgs(...new Set([1, 2, 3])));
+  assertEquals(4, countArgs(...new Set([1, 2, 3, 4])));
+  assertEquals(5, countArgs(...new Set([1, 2, 3, 4, 5])));
+  assertEquals(6, countArgs(...new Set([1, 2, 3, 4, 5, 6])));
+
+  assertEquals(3, countArgs(...(function*(){
+    yield 1;
+    yield 2;
+    yield 3;
+  })()));
+
+  // Test values
+  function sum() {
+    var sum = arguments[0];
+    for (var i = 1; i < arguments.length; ++i) {
+      sum += arguments[i];
+    }
+    return sum;
+  }
+
+  assertEquals(void 0, sum(...""));
+  assertEquals(void 0, sum(...[]));
+  assertEquals(void 0, sum(...new Set));
+  assertEquals(void 0, sum(...(function*() { })()));
+
+  assertEquals("test", sum(..."test"));
+  assertEquals(10, sum(...[1, 2, 3, 4]));
+  assertEquals(10, sum(...[1, 2, 3], 4));
+  assertEquals(10, sum(1, ...[2, 3], 4));
+  assertEquals(10, sum(1, ...[2, 3], ...[4]));
+  assertEquals(10, sum(1, 2, ...[3, 4]));
+  assertEquals(10, sum(...new Set([1, 2, 3, 4])));
+  assertEquals(10, sum(...(function*() {
+    yield 1;
+    yield 2;
+    yield 3;
+    yield 4;
+  })()));
+
+  // nested spreads
+  function makeArray() {
+    var result = [];
+    for (var i = 0; i < arguments.length; ++i) {
+      result.push(arguments[i]);
+    }
+    return result;
+  }
+  assertEquals(10, sum(...makeArray(...[1, 2, 3, 4])));
+  assertEquals("test!!!", sum(...makeArray(..."test!!!")));
+
+  // Interleaved spread/unspread args
+  assertEquals(36, sum(0, ...[1], 2, 3, ...[4, 5], 6, 7, 8));
+  assertEquals(45, sum(0, ...[1], 2, 3, ...[4, 5], 6, 7, 8, ...[9]));
+
+  // Methods
+  var O = {
+    returnThis: returnThis,
+    countArgs: countArgs,
+    sum: sum,
+    makeArray: makeArray,
+
+    nested: {
+      returnThis: returnThis,
+      countArgs: countArgs,
+      sum: sum,
+      makeArray: makeArray
+    }
+  };
+
+  // Test this argument
+  assertEquals(O, O.returnThis(..."test"));
+  assertEquals(O, O["returnThis"](..."test"));
+  assertEquals(O.nested, O.nested.returnThis(..."test"));
+  assertEquals(O.nested, O.nested["returnThis"](..."test"));
+
+  // Test argument counting with different iterables
+  assertEquals(0, O.countArgs(...""));
+  assertEquals(4, O.countArgs(..."test"));
+  assertEquals(4, O.countArgs(..."tes", ..."t"));
+  assertEquals(4, O.countArgs("t", ..."es", "t"));
+  assertEquals(4, O.countArgs("tes", ..."t!!"));
+
+  assertEquals(1, O.countArgs(...[1]));
+  assertEquals(2, O.countArgs(...[1, 2]));
+  assertEquals(3, O.countArgs(...[1, 2, 3]));
+  assertEquals(4, O.countArgs(...[1, 2, 3, 4]));
+  assertEquals(5, O.countArgs(...[1, 2, 3, 4, 5]));
+  assertEquals(6, O.countArgs(...[1, 2, 3, 4, 5, 6]));
+
+  assertEquals(1, O.countArgs(...new Set([1])));
+  assertEquals(2, O.countArgs(...new Set([1, 2])));
+  assertEquals(3, O.countArgs(...new Set([1, 2, 3])));
+  assertEquals(4, O.countArgs(...new Set([1, 2, 3, 4])));
+  assertEquals(5, O.countArgs(...new Set([1, 2, 3, 4, 5])));
+  assertEquals(6, O.countArgs(...new Set([1, 2, 3, 4, 5, 6])));
+
+  assertEquals(3, O.countArgs(...(function*(){
+    yield 1;
+    yield 2;
+    yield 3;
+  })()));
+
+  // Test values
+  assertEquals(void 0, O.sum(...""));
+  assertEquals(void 0, O.sum(...[]));
+  assertEquals(void 0, O.sum(...new Set));
+  assertEquals(void 0, O.sum(...(function*() { })()));
+
+  assertEquals("test", O.sum(..."test"));
+  assertEquals(10, O.sum(...[1, 2, 3, 4]));
+  assertEquals(10, O.sum(...[1, 2, 3], 4));
+  assertEquals(10, O.sum(1, ...[2, 3], 4));
+  assertEquals(10, O.sum(1, ...[2, 3], ...[4]));
+  assertEquals(10, O.sum(1, 2, ...[3, 4]));
+  assertEquals(10, O.sum(...new Set([1, 2, 3, 4])));
+  assertEquals(10, O.sum(...(function*() {
+    yield 1;
+    yield 2;
+    yield 3;
+    yield 4;
+  })()));
+
+  // nested spreads
+  assertEquals(10, O.sum(...O.makeArray(...[1, 2, 3, 4])));
+  assertEquals("test!!!", O.sum(...O.makeArray(..."test!!!")));
+
+  // Interleaved spread/unspread args
+  assertEquals(36, O.sum(0, ...[1], 2, 3, ...[4, 5], 6, 7, 8));
+  assertEquals(45, O.sum(0, ...[1], 2, 3, ...[4, 5], 6, 7, 8, ...[9]));
+})();
+
+
+(function testSpreadEvaluationOrder() {
+  "use strict";
+  var log = "";
+  function* gen() { log += "X"; yield 0; log += "Y"; }
+  function a() { log += "A"; }
+  function b() { log += "B"; return gen(); }
+  function* c() { log += 'C1'; yield 1; log += 'C2'; }
+  function d() { log += "D"; }
+  function e() { log += "E"; }
+  function fn() {
+    var args = [];
+    for (var i = 0; i < arguments.length; ++i) args.push(arguments[i]);
+    return args;
+  }
+
+  var result = fn(a(), ...b(), d());
+  assertEquals([undefined, 0, undefined], result);
+  assertEquals("ABXYD", log);
+
+  log = "";
+  result = fn(...b(), d());
+  assertEquals([0, undefined], result);
+  assertEquals("BXYD", log);
+
+  log = "";
+  result = fn(a(), ...b());
+  assertEquals([undefined, 0], result);
+  assertEquals("ABXY", log);
+
+  log = "";
+  result = fn(a(), ...b(), ...c(), d(), e());
+  assertEquals([undefined, 0, 1, undefined, undefined], result);
+  assertEquals("ABXYC1C2DE", log);
+
+  log = "";
+  result = fn(a(), ...b(), ...c(), d(), e(), ...b(), ...c());
+  assertEquals([undefined, 0, 1, undefined, undefined, 0, 1], result);
+  assertEquals("ABXYC1C2DEBXYC1C2", log);
+})();
+
+
+(function testCustomArrayPrototypeIterator() {
+  var origIterator =
+      Object.getOwnPropertyDescriptor(Array.prototype, Symbol.iterator);
+  Object.defineProperty(Array.prototype, Symbol.iterator, {
+    value: function*() {
+      yield 1;
+      yield 2;
+      yield 3;
+    },
+    configurable: true
+  });
+  function returnCountStrict() { 'use strict'; return arguments.length; }
+  function returnCountSloppy() { return arguments.length; }
+
+  assertEquals(3, returnCountStrict(...[1]));
+  assertEquals(4, returnCountStrict(1, ...[2]));
+  assertEquals(5, returnCountStrict(1, ...[2], 3));
+  assertEquals(3, returnCountSloppy(...[1]));
+  assertEquals(4, returnCountSloppy(1, ...[2]));
+  assertEquals(5, returnCountSloppy(1, ...[2], 3));
+
+  Object.defineProperty(Array.prototype, Symbol.iterator, origIterator);
+})();