[es7] implement exponentiation operator proposal

test/cctest/test-parsing.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1493 matching lines @@
   kAllowLazy,
   kAllowNatives,
   kAllowHarmonyDefaultParameters,
   kAllowHarmonySloppy,
   kAllowHarmonySloppyLet,
   kAllowHarmonyDestructuring,
   kAllowHarmonyDestructuringAssignment,
   kAllowHarmonyNewTarget,
   kAllowStrongMode,
   kNoLegacyConst,
-  kAllowHarmonyFunctionSent
+  kAllowHarmonyFunctionSent,
+  kAllowHarmonyExponentiationOperator
 };
 
 enum ParserSyncTestResult {
   kSuccessOrError,
   kSuccess,
   kError
 };
 
 template <typename Traits>
 void SetParserFlags(i::ParserBase<Traits>* parser,
                     i::EnumSet<ParserFlag> flags) {
   parser->set_allow_lazy(flags.Contains(kAllowLazy));
   parser->set_allow_natives(flags.Contains(kAllowNatives));
   parser->set_allow_harmony_default_parameters(
       flags.Contains(kAllowHarmonyDefaultParameters));
   parser->set_allow_harmony_sloppy(flags.Contains(kAllowHarmonySloppy));
   parser->set_allow_harmony_sloppy_let(flags.Contains(kAllowHarmonySloppyLet));
   parser->set_allow_harmony_destructuring_bind(
       flags.Contains(kAllowHarmonyDestructuring));
   parser->set_allow_harmony_destructuring_assignment(
       flags.Contains(kAllowHarmonyDestructuringAssignment));
   parser->set_allow_strong_mode(flags.Contains(kAllowStrongMode));
   parser->set_allow_legacy_const(!flags.Contains(kNoLegacyConst));
   parser->set_allow_harmony_function_sent(
       flags.Contains(kAllowHarmonyFunctionSent));
+  parser->set_allow_harmony_exponentiation_operator(
+      flags.Contains(kAllowHarmonyExponentiationOperator));
 }
 
 
 void TestParserSyncWithFlags(i::Handle<i::String> source,
                              i::EnumSet<ParserFlag> flags,
                              ParserSyncTestResult result,
                              bool is_module = false) {
   i::Isolate* isolate = CcTest::i_isolate();
   i::Factory* factory = isolate->factory();
 
@@ skipping 6431 matching lines @@
     { NULL, NULL }
   };
   const char* error_data[] = {
     "var x = new.target",
     "function f() { return new.t\\u0061rget; }",
     NULL
   };
   // clang-format on
   RunParserSyncTest(context_data, error_data, kError);
 }
+
+TEST(ExponentiationOperator) {
+  // clang-format off
+  const char* context_data[][2] = {
+    { "var O = { p: 1 }, x = 10; ; if (", ") { foo(); }" },
+    { "var O = { p: 1 }, x = 10; ; (", ")" },
+    { "var O = { p: 1 }, x = 10; foo(", ")" },
+    { NULL, NULL }
+  };
+  const char* data[] = {
+    "(delete O.p) ** 10",
+    "(delete x) ** 10",
+    "(~O.p) ** 10",
+    "(~x) ** 10",
+    "(!O.p) ** 10",
+    "(!x) ** 10",
+    "(+O.p) ** 10",
+    "(+x) ** 10",
+    "(-O.p) ** 10",
+    "(-x) ** 10",
+    "(typeof O.p) ** 10",
+    "(typeof x) ** 10",
+    "(void 0) ** 10",
+    "(void O.p) ** 10",
+    "(void x) ** 10",
+    "++O.p ** 10",
+    "++x ** 10",
+    "--O.p ** 10",
+    "--x ** 10",
+    "O.p++ ** 10",
+    "x++ ** 10",
+    "O.p-- ** 10",
+    "x-- ** 10",
+    NULL
+  };
+  // clang-format on
+
+  static const ParserFlag always_flags[] = {
+      kAllowHarmonyExponentiationOperator};
+  RunParserSyncTest(context_data, data, kSuccess, NULL, 0, always_flags,
+                    arraysize(always_flags));
+}
+
+TEST(ExponentiationOperatorErrors) {
+  // clang-format off
+  const char* context_data[][2] = {
+    { "var O = { p: 1 }, x = 10; ; if (", ") { foo(); }" },
+    { "var O = { p: 1 }, x = 10; ; (", ")" },
+    { "var O = { p: 1 }, x = 10; foo(", ")" },
+    { NULL, NULL }
+  };
+  const char* error_data[] = {
+    "delete O.p ** 10",
+    "delete x ** 10",
+    "~O.p ** 10",
+    "~x ** 10",
+    "!O.p ** 10",
+    "!x ** 10",
+    "+O.p ** 10",
+    "+x ** 10",
+    "-O.p ** 10",
+    "-x ** 10",
+    "typeof O.p ** 10",
+    "typeof x ** 10",
+    "void ** 10",
+    "void O.p ** 10",
+    "void x ** 10",
+    "++delete O.p ** 10",
+    "--delete O.p ** 10",
+    "++~O.p ** 10",
+    "++~x ** 10",
+    "--!O.p ** 10",
+    "--!x ** 10",
+    "++-O.p ** 10",
+    "++-x ** 10",
+    "--+O.p ** 10",
+    "--+x ** 10",
+    NULL
+  };
+  // clang-format on
+
+  static const ParserFlag always_flags[] = {
+      kAllowHarmonyExponentiationOperator};
+  RunParserSyncTest(context_data, error_data, kError, NULL, 0, always_flags,
+                    arraysize(always_flags));
+}