Move rtc_json code from API dir, enable unit test, unmark testonly

This change does three things:
 - Move rtc_json into rtc_base/strings/, a non-API directory more fitting to
   its purpose.
 - Make a target for the currently unused json_unittest.
 - Make the code available for use in non-test code again.

Bug: webrtc:9802
Change-Id: Id964a8a4b47b732a962a364894a4dbd3e7f4650f
Reviewed-on: https://webrtc-review.googlesource.com/103126
Commit-Queue: Sam Zackrisson <saza@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24932}
diff --git a/rtc_base/strings/json_unittest.cc b/rtc_base/strings/json_unittest.cc
new file mode 100644
index 0000000..2215769
--- /dev/null
+++ b/rtc_base/strings/json_unittest.cc
@@ -0,0 +1,283 @@
+/*
+ *  Copyright 2009 The WebRTC 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 in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rtc_base/strings/json.h"
+
+#include <vector>
+
+#include "rtc_base/gunit.h"
+
+namespace rtc {
+
+static Json::Value in_s("foo");
+static Json::Value in_sn("99");
+static Json::Value in_si("-99");
+static Json::Value in_sb("true");
+static Json::Value in_sd("1.2");
+static Json::Value in_n(12);
+static Json::Value in_i(-12);
+static Json::Value in_u(34U);
+static Json::Value in_b(true);
+static Json::Value in_d(1.2);
+static Json::Value big_sn("12345678901234567890");
+static Json::Value big_si("-12345678901234567890");
+static Json::Value big_u(0xFFFFFFFF);
+static Json::Value bad_a(Json::arrayValue);
+static Json::Value bad_o(Json::objectValue);
+
+TEST(JsonTest, GetString) {
+  std::string out;
+  EXPECT_TRUE(GetStringFromJson(in_s, &out));
+  EXPECT_EQ("foo", out);
+  EXPECT_TRUE(GetStringFromJson(in_sn, &out));
+  EXPECT_EQ("99", out);
+  EXPECT_TRUE(GetStringFromJson(in_si, &out));
+  EXPECT_EQ("-99", out);
+  EXPECT_TRUE(GetStringFromJson(in_i, &out));
+  EXPECT_EQ("-12", out);
+  EXPECT_TRUE(GetStringFromJson(in_n, &out));
+  EXPECT_EQ("12", out);
+  EXPECT_TRUE(GetStringFromJson(in_u, &out));
+  EXPECT_EQ("34", out);
+  EXPECT_TRUE(GetStringFromJson(in_b, &out));
+  EXPECT_EQ("true", out);
+  // Not supported here yet.
+  EXPECT_FALSE(GetStringFromJson(bad_a, &out));
+  EXPECT_FALSE(GetStringFromJson(bad_o, &out));
+}
+
+TEST(JsonTest, GetInt) {
+  int out;
+  EXPECT_TRUE(GetIntFromJson(in_sn, &out));
+  EXPECT_EQ(99, out);
+  EXPECT_TRUE(GetIntFromJson(in_si, &out));
+  EXPECT_EQ(-99, out);
+  EXPECT_TRUE(GetIntFromJson(in_n, &out));
+  EXPECT_EQ(12, out);
+  EXPECT_TRUE(GetIntFromJson(in_i, &out));
+  EXPECT_EQ(-12, out);
+  EXPECT_TRUE(GetIntFromJson(in_u, &out));
+  EXPECT_EQ(34, out);
+  EXPECT_TRUE(GetIntFromJson(in_b, &out));
+  EXPECT_EQ(1, out);
+  EXPECT_FALSE(GetIntFromJson(in_s, &out));
+  EXPECT_FALSE(GetIntFromJson(big_sn, &out));
+  EXPECT_FALSE(GetIntFromJson(big_si, &out));
+  EXPECT_FALSE(GetIntFromJson(big_u, &out));
+  EXPECT_FALSE(GetIntFromJson(bad_a, &out));
+  EXPECT_FALSE(GetIntFromJson(bad_o, &out));
+}
+
+TEST(JsonTest, GetUInt) {
+  unsigned int out;
+  EXPECT_TRUE(GetUIntFromJson(in_sn, &out));
+  EXPECT_EQ(99U, out);
+  EXPECT_TRUE(GetUIntFromJson(in_n, &out));
+  EXPECT_EQ(12U, out);
+  EXPECT_TRUE(GetUIntFromJson(in_u, &out));
+  EXPECT_EQ(34U, out);
+  EXPECT_TRUE(GetUIntFromJson(in_b, &out));
+  EXPECT_EQ(1U, out);
+  EXPECT_TRUE(GetUIntFromJson(big_u, &out));
+  EXPECT_EQ(0xFFFFFFFFU, out);
+  EXPECT_FALSE(GetUIntFromJson(in_s, &out));
+  // TODO(bugs.webrtc.org/9804): Fail reading negative strings.
+  // EXPECT_FALSE(GetUIntFromJson(in_si, &out));
+  EXPECT_FALSE(GetUIntFromJson(in_i, &out));
+  EXPECT_FALSE(GetUIntFromJson(big_sn, &out));
+  EXPECT_FALSE(GetUIntFromJson(big_si, &out));
+  EXPECT_FALSE(GetUIntFromJson(bad_a, &out));
+  EXPECT_FALSE(GetUIntFromJson(bad_o, &out));
+}
+
+TEST(JsonTest, GetBool) {
+  bool out;
+  EXPECT_TRUE(GetBoolFromJson(in_sb, &out));
+  EXPECT_EQ(true, out);
+  EXPECT_TRUE(GetBoolFromJson(in_n, &out));
+  EXPECT_EQ(true, out);
+  EXPECT_TRUE(GetBoolFromJson(in_i, &out));
+  EXPECT_EQ(true, out);
+  EXPECT_TRUE(GetBoolFromJson(in_u, &out));
+  EXPECT_EQ(true, out);
+  EXPECT_TRUE(GetBoolFromJson(in_b, &out));
+  EXPECT_EQ(true, out);
+  EXPECT_TRUE(GetBoolFromJson(big_u, &out));
+  EXPECT_EQ(true, out);
+  EXPECT_FALSE(GetBoolFromJson(in_s, &out));
+  EXPECT_FALSE(GetBoolFromJson(in_sn, &out));
+  EXPECT_FALSE(GetBoolFromJson(in_si, &out));
+  EXPECT_FALSE(GetBoolFromJson(big_sn, &out));
+  EXPECT_FALSE(GetBoolFromJson(big_si, &out));
+  EXPECT_FALSE(GetBoolFromJson(bad_a, &out));
+  EXPECT_FALSE(GetBoolFromJson(bad_o, &out));
+}
+
+TEST(JsonTest, GetDouble) {
+  double out;
+  EXPECT_TRUE(GetDoubleFromJson(in_sn, &out));
+  EXPECT_EQ(99, out);
+  EXPECT_TRUE(GetDoubleFromJson(in_si, &out));
+  EXPECT_EQ(-99, out);
+  EXPECT_TRUE(GetDoubleFromJson(in_sd, &out));
+  EXPECT_EQ(1.2, out);
+  EXPECT_TRUE(GetDoubleFromJson(in_n, &out));
+  EXPECT_EQ(12, out);
+  EXPECT_TRUE(GetDoubleFromJson(in_i, &out));
+  EXPECT_EQ(-12, out);
+  EXPECT_TRUE(GetDoubleFromJson(in_u, &out));
+  EXPECT_EQ(34, out);
+  EXPECT_TRUE(GetDoubleFromJson(in_b, &out));
+  EXPECT_EQ(1, out);
+  EXPECT_TRUE(GetDoubleFromJson(in_d, &out));
+  EXPECT_EQ(1.2, out);
+  EXPECT_FALSE(GetDoubleFromJson(in_s, &out));
+}
+
+TEST(JsonTest, GetFromArray) {
+  Json::Value a, out;
+  a.append(in_s);
+  a.append(in_i);
+  a.append(in_u);
+  a.append(in_b);
+  EXPECT_TRUE(GetValueFromJsonArray(a, 0, &out));
+  EXPECT_TRUE(GetValueFromJsonArray(a, 3, &out));
+  EXPECT_FALSE(GetValueFromJsonArray(a, 99, &out));
+  EXPECT_FALSE(GetValueFromJsonArray(a, 0xFFFFFFFF, &out));
+}
+
+TEST(JsonTest, GetFromObject) {
+  Json::Value o, out;
+  o["string"] = in_s;
+  o["int"] = in_i;
+  o["uint"] = in_u;
+  o["bool"] = in_b;
+  EXPECT_TRUE(GetValueFromJsonObject(o, "int", &out));
+  EXPECT_TRUE(GetValueFromJsonObject(o, "bool", &out));
+  EXPECT_FALSE(GetValueFromJsonObject(o, "foo", &out));
+  EXPECT_FALSE(GetValueFromJsonObject(o, "", &out));
+}
+
+namespace {
+template <typename T>
+std::vector<T> VecOf3(const T& a, const T& b, const T& c) {
+  std::vector<T> in;
+  in.push_back(a);
+  in.push_back(b);
+  in.push_back(c);
+  return in;
+}
+template <typename T>
+Json::Value JsonVecOf3(const T& a, const T& b, const T& c) {
+  Json::Value in(Json::arrayValue);
+  in.append(a);
+  in.append(b);
+  in.append(c);
+  return in;
+}
+}  // unnamed namespace
+
+TEST(JsonTest, ValueVectorToFromArray) {
+  std::vector<Json::Value> in = VecOf3<Json::Value>("a", "b", "c");
+  Json::Value out = ValueVectorToJsonArray(in);
+  EXPECT_EQ(in.size(), out.size());
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); ++i) {
+    EXPECT_EQ(in[i].asString(), out[i].asString());
+  }
+  Json::Value inj = JsonVecOf3<Json::Value>("a", "b", "c");
+  EXPECT_EQ(inj, out);
+  std::vector<Json::Value> outj;
+  EXPECT_TRUE(JsonArrayToValueVector(inj, &outj));
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); i++) {
+    EXPECT_EQ(in[i], outj[i]);
+  }
+}
+
+TEST(JsonTest, IntVectorToFromArray) {
+  std::vector<int> in = VecOf3<int>(1, 2, 3);
+  Json::Value out = IntVectorToJsonArray(in);
+  EXPECT_EQ(in.size(), out.size());
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); ++i) {
+    EXPECT_EQ(in[i], out[i].asInt());
+  }
+  Json::Value inj = JsonVecOf3<int>(1, 2, 3);
+  EXPECT_EQ(inj, out);
+  std::vector<int> outj;
+  EXPECT_TRUE(JsonArrayToIntVector(inj, &outj));
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); i++) {
+    EXPECT_EQ(in[i], outj[i]);
+  }
+}
+
+TEST(JsonTest, UIntVectorToFromArray) {
+  std::vector<unsigned int> in = VecOf3<unsigned int>(1, 2, 3);
+  Json::Value out = UIntVectorToJsonArray(in);
+  EXPECT_EQ(in.size(), out.size());
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); ++i) {
+    EXPECT_EQ(in[i], out[i].asUInt());
+  }
+  Json::Value inj = JsonVecOf3<unsigned int>(1, 2, 3);
+  EXPECT_EQ(inj, out);
+  std::vector<unsigned int> outj;
+  EXPECT_TRUE(JsonArrayToUIntVector(inj, &outj));
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); i++) {
+    EXPECT_EQ(in[i], outj[i]);
+  }
+}
+
+TEST(JsonTest, StringVectorToFromArray) {
+  std::vector<std::string> in = VecOf3<std::string>("a", "b", "c");
+  Json::Value out = StringVectorToJsonArray(in);
+  EXPECT_EQ(in.size(), out.size());
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); ++i) {
+    EXPECT_EQ(in[i], out[i].asString());
+  }
+  Json::Value inj = JsonVecOf3<std::string>("a", "b", "c");
+  EXPECT_EQ(inj, out);
+  std::vector<std::string> outj;
+  EXPECT_TRUE(JsonArrayToStringVector(inj, &outj));
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); i++) {
+    EXPECT_EQ(in[i], outj[i]);
+  }
+}
+
+TEST(JsonTest, BoolVectorToFromArray) {
+  std::vector<bool> in = VecOf3<bool>(false, true, false);
+  Json::Value out = BoolVectorToJsonArray(in);
+  EXPECT_EQ(in.size(), out.size());
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); ++i) {
+    EXPECT_EQ(in[i], out[i].asBool());
+  }
+  Json::Value inj = JsonVecOf3<bool>(false, true, false);
+  EXPECT_EQ(inj, out);
+  std::vector<bool> outj;
+  EXPECT_TRUE(JsonArrayToBoolVector(inj, &outj));
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); i++) {
+    EXPECT_EQ(in[i], outj[i]);
+  }
+}
+
+TEST(JsonTest, DoubleVectorToFromArray) {
+  std::vector<double> in = VecOf3<double>(1.0, 2.0, 3.0);
+  Json::Value out = DoubleVectorToJsonArray(in);
+  EXPECT_EQ(in.size(), out.size());
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); ++i) {
+    EXPECT_EQ(in[i], out[i].asDouble());
+  }
+  Json::Value inj = JsonVecOf3<double>(1.0, 2.0, 3.0);
+  EXPECT_EQ(inj, out);
+  std::vector<double> outj;
+  EXPECT_TRUE(JsonArrayToDoubleVector(inj, &outj));
+  for (Json::Value::ArrayIndex i = 0; i < in.size(); i++) {
+    EXPECT_EQ(in[i], outj[i]);
+  }
+}
+
+}  // namespace rtc