Add jsoncons library as third-party dependency

src/CMakeLists.txt

@@ -15,6 +15,19 @@ add_third_party(
   LIB libdouble-conversion.a
 )
 
+add_third_party(
+  jsoncons
+  URL https://github.com/danielaparker/jsoncons/archive/refs/tags/v0.168.7.tar.gz
+  CMAKE_PASS_FLAGS "-DJSONCONS_BUILD_TESTS=OFF"
+  
+  LIB "none"
+)
+
+add_library(TRDP::jsoncons INTERFACE IMPORTED)
+add_dependencies(TRDP::jsoncons jsoncons_project)
+set_target_properties(TRDP::jsoncons PROPERTIES
+                      INTERFACE_INCLUDE_DIRECTORIES "${JSONCONS_INCLUDE_DIR}")
+
 Message(STATUS "THIRD_PARTY_LIB_DIR ${THIRD_PARTY_LIB_DIR}")
 
 

src/core/CMakeLists.txt

@@ -14,3 +14,4 @@ cxx_test(extent_tree_test dfly_core LABELS DFLY)
 cxx_test(external_alloc_test dfly_core LABELS DFLY)
 cxx_test(dash_test dfly_core LABELS DFLY)
 cxx_test(interpreter_test dfly_core LABELS DFLY)
+cxx_test(json_test dfly_core TRDP::jsoncons LABELS DFLY)

src/core/json_test.cc

@@ -0,0 +1,43 @@
+// Copyright 2022, Roman Gershman.  All rights reserved.
+// See LICENSE for licensing terms.
+//
+
+#include <jsoncons/json.hpp>
+#include <jsoncons_ext/jsonpath/jsonpath.hpp>
+
+#include "base/gtest.h"
+#include "base/logging.h"
+
+namespace dfly {
+using namespace std;
+using namespace jsoncons;
+
+class JsonTest : public ::testing::Test {
+ protected:
+  JsonTest() {
+  }
+};
+
+TEST_F(JsonTest, Basic) {
+  string data = R"(
+    {
+       "application": "hiking",
+       "reputons": [
+       {
+           "rater": "HikingAsylum",
+           "assertion": "advanced",
+           "rated": "Marilyn C",
+           "rating": 0.90,
+           "confidence": 0.99
+         }
+       ]
+    }
+)";
+
+  json j = json::parse(data);
+  EXPECT_TRUE(j.contains("reputons"));
+  jsonpath::json_replace(j, "$.reputons[*].rating", 1.1);
+  EXPECT_EQ(1.1, j["reputons"][0]["rating"].as_double());
+}
+
+}  // namespace dfly