[tracing] Add support for TracedValue JSON serializer.

test/cctest/test-traced-value.cc

+// Copyright 2016 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.
+
+#include "src/tracing/traced-value.h"
+#include "test/cctest/cctest.h"
+
+using v8::tracing::TracedValue;
+
+TEST(FlatDictionary) {
+  auto value = TracedValue::Create();
+  value->SetInteger("int", 2014);
+  value->SetDouble("double", 0.0);
+  value->SetBoolean("bool", true);
+  value->SetString("string", "string");
+  std::string json = "PREFIX";
+  value->AppendAsTraceFormat(&json);
+  CHECK_EQ(
+      "PREFIX{\"int\":2014,\"double\":0.000000,\"bool\":true,\"string\":"
+      "\"string\"}",
+      json);
+}
+
+TEST(NoDotPathExpansion) {
+  auto value = TracedValue::Create();
+  value->SetInteger("in.t", 2014);
+  value->SetDouble("doub.le", 0.0);
+  value->SetBoolean("bo.ol", true);
+  value->SetString("str.ing", "str.ing");
+  std::string json;
+  value->AppendAsTraceFormat(&json);
+  CHECK_EQ(
+      "{\"in.t\":2014,\"doub.le\":0.000000,\"bo.ol\":true,\"str.ing\":\"str."
+      "ing\"}",
+      json);
+}
+
+TEST(Hierarchy) {
+  auto value = TracedValue::Create();
+  value->SetInteger("i0", 2014);
+  value->BeginDictionary("dict1");
+  value->SetInteger("i1", 2014);
+  value->BeginDictionary("dict2");
+  value->SetBoolean("b2", false);
+  value->EndDictionary();
+  value->SetString("s1", "foo");
+  value->EndDictionary();
+  value->SetDouble("d0", 0.0);
+  value->SetBoolean("b0", true);
+  value->BeginArray("a1");
+  value->AppendInteger(1);
+  value->AppendBoolean(true);
+  value->BeginDictionary();
+  value->SetInteger("i2", 3);
+  value->EndDictionary();
+  value->EndArray();
+  value->SetString("s0", "foo");
+
+  value->BeginArray("arr1");
+  value->BeginDictionary();
+  value->EndDictionary();
+  value->BeginArray();
+  value->EndArray();
+  value->BeginDictionary();
+  value->EndDictionary();
+  value->EndArray();
+
+  std::string json;
+  value->AppendAsTraceFormat(&json);
+  CHECK_EQ(
+      "{\"i0\":2014,\"dict1\":{\"i1\":2014,\"dict2\":{\"b2\":false},"
+      "\"s1\":\"foo\"},\"d0\":0.000000,\"b0\":true,\"a1\":[1,true,{\"i2\":3}],"
+      "\"s0\":\"foo\",\"arr1\":[{},[],{}]}",
+      json);
+}
+
+TEST(LongStrings) {
+  std::string long_string = "supercalifragilisticexpialidocious";
+  std::string long_string2 = "0123456789012345678901234567890123456789";
+  char long_string3[4096];
+  for (size_t i = 0; i < sizeof(long_string3); ++i)
+    long_string3[i] = static_cast<char>('a' + (i % 26));
+  long_string3[sizeof(long_string3) - 1] = '\0';
+
+  auto value = TracedValue::Create();
+  value->SetString("a", "short");
+  value->SetString("b", long_string);
+  value->BeginArray("c");
+  value->AppendString(long_string2);
+  value->AppendString("");
+  value->BeginDictionary();
+  value->SetString("a", long_string3);
+  value->EndDictionary();
+  value->EndArray();
+
+  std::string json;
+  value->AppendAsTraceFormat(&json);
+  CHECK_EQ("{\"a\":\"short\",\"b\":\"" + long_string + "\",\"c\":[\"" +
+               long_string2 + "\",\"\",{\"a\":\"" + long_string3 + "\"}]}",
+           json);
+}
+
+TEST(Escaping) {
+  const char* string1 = "abc\"\'\\\\x\"y\'z\n\x09\x17";
+  std::string chars127;
+  for (int i = 1; i <= 127; ++i) {
+    chars127 += static_cast<char>(i);
+  }
+  auto value = TracedValue::Create();
+  value->SetString("a", string1);
+  value->SetString("b", chars127);
+
+  std::string json;
+  value->AppendAsTraceFormat(&json);
+  // Cannot use the expected value literal directly in CHECK_EQ
+  // as it fails to process # character on Windows.
+  const char* expected =
+      "{\"a\":\"abc\\\"\'\\\\\\\\x\\\"y\'z\\n\\t\\u0017\",\"b\":"
+      "\"\\u0001\\u0002\\u0003\\u0004\\u0005\\u0006\\u0007\\u0008\\t\\n\\u000B"
+      "\\u000C\\u000D\\u000E\\u000F\\u0010\\u0011\\u0012\\u0013\\u0014\\u0015\\"
+      "u0016\\u0017\\u0018\\u0019\\u001A\\u001B\\u001C\\u001D\\u001E\\u001F "
+      "!\\\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`"
+      "abcdefghijklmnopqrstuvwxyz{|}~\177\"}";
+  CHECK_EQ(expected, json);
+}