WIP: Implement ES6 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
index 0000000000000000000000000000000000000000..8d1ea0d396fc0e53a1eec8de879b016ce1c12809
--- /dev/null
+++ b/test/mjsunit/harmony/spread-call.js
@@ -0,0 +1,149 @@
+// Copyright 2014 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.
+
+(function testSpreadCallsStrict() {
+  "use strict"
+  function countArgs() { return arguments.length; }
+
+  // Test argument counting with different iterables
+  assertEquals(0, countArgs(...""));
+  assertEquals(1, countArgs(..."t"));
+  assertEquals(2, countArgs(..."te"));
+  assertEquals(3, countArgs(..."tes"));
+  assertEquals(4, countArgs(..."test"));
+  assertEquals(4, countArgs(..."tes", ..."t"));
+  assertEquals(4, countArgs("t", ..."es", "t"));
+  assertEquals(5, countArgs(..."test!"));
+  assertEquals(5, countArgs(..."tes", ..."t!"));
+  assertEquals(6, countArgs(..."test!!"));
+  assertEquals(6, 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!!!")));
+})();
+
+
+(function testSpreadCallsSloppy() {
+  function countArgs() { return arguments.length; }
+
+  // Test argument counting with different iterables
+  assertEquals(0, countArgs(...""));
+  assertEquals(1, countArgs(..."t"));
+  assertEquals(2, countArgs(..."te"));
+  assertEquals(3, countArgs(..."tes"));
+  assertEquals(4, countArgs(..."test"));
+  assertEquals(4, countArgs(..."tes", ..."t"));
+  assertEquals(4, countArgs("t", ..."es", "t"));
+  assertEquals(5, countArgs(..."test!"));
+  assertEquals(5, countArgs(..."tes", ..."t!"));
+  assertEquals(6, countArgs(..."test!!"));
+  assertEquals(6, 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!!!")));
+})();