Don't use JsonBuffer to create or parse objects and arrays.

* Added DynamicJsonArray and StaticJsonArray
* Added DynamicJsonObject and StaticJsonObject
* Added DynamicJsonVariant and StaticJsonVariant
* Added deserializeJson()
* Removed JsonBuffer::parseArray(), parseObject() and parse()
* Removed JsonBuffer::createArray() and createObject()

test/JsonParser/nestingLimit.cpp

@@ -0,0 +1,48 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+bool tryParseArray(const char *json, uint8_t nestingLimit) {
+  DynamicJsonArray array;
+  return deserializeJson(array, json, nestingLimit);
+}
+
+bool tryParseObject(const char *json, uint8_t nestingLimit) {
+  DynamicJsonObject obj;
+  return deserializeJson(obj, json, nestingLimit);
+}
+
+TEST_CASE("JsonParser nestingLimit") {
+  SECTION("ParseArrayWithNestingLimit0") {
+    REQUIRE(true == tryParseArray("[]", 0));
+    REQUIRE(false == tryParseArray("[[]]", 0));
+  }
+
+  SECTION("ParseArrayWithNestingLimit1") {
+    REQUIRE(true == tryParseArray("[[]]", 1));
+    REQUIRE(false == tryParseArray("[[[]]]", 1));
+  }
+
+  SECTION("ParseArrayWithNestingLimit2") {
+    REQUIRE(true == tryParseArray("[[[]]]", 2));
+    REQUIRE(false == tryParseArray("[[[[]]]]", 2));
+  }
+
+  SECTION("ParseObjectWithNestingLimit0") {
+    REQUIRE(true == tryParseObject("{}", 0));
+    REQUIRE(false == tryParseObject("{\"key\":{}}", 0));
+  }
+
+  SECTION("ParseObjectWithNestingLimit1") {
+    REQUIRE(true == tryParseObject("{\"key\":{}}", 1));
+    REQUIRE(false == tryParseObject("{\"key\":{\"key\":{}}}", 1));
+  }
+
+  SECTION("ParseObjectWithNestingLimit2") {
+    REQUIRE(true == tryParseObject("{\"key\":{\"key\":{}}}", 2));
+    REQUIRE(false == tryParseObject("{\"key\":{\"key\":{\"key\":{}}}}", 2));
+  }
+}