Add new C37.118 Synchrophasor node-type (reloaded)

CMakeLists.txt

@@ -78,6 +78,7 @@ find_package(OpenSSL 1.0.0 REQUIRED)
 find_package(PkgConfig REQUIRED)
 find_package(spdlog REQUIRED)
 find_package(Threads REQUIRED)
+find_package(nlohmann_json REQUIRED)
 find_package(OpenMP)
 find_package(IBVerbs)
 find_package(RDMACM)

common/include/villas/json.hpp

@@ -0,0 +1,47 @@
+/* Json parsing and support code.
+ *
+ * Author: Philipp Jungkamp <philipp.jungkamp@rwth-aachen.de>
+ * SPDX-FileCopyrightText: 2024-2025 Institute for Automation of Complex Power Systems, RWTH Aachen University
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <fmt/ostream.h>
+#include <nlohmann/json.hpp>
+
+#include <villas/fs.hpp>
+
+extern template class nlohmann::basic_json<>;
+
+namespace villas {
+
+using Json = nlohmann::json;
+using JsonPointer = Json::json_pointer;
+
+// forward declaration for villas/jansson.hpp compatibility header
+class JanssonPtr;
+void to_json(Json &json, JanssonPtr const &jansson);
+void from_json(Json const &json, JanssonPtr &jansson);
+
+struct LoadConfigFileOptions {
+  bool allow_libconfig = false;
+  bool allow_environment = false;
+  bool allow_include = false;
+};
+
+// load a configuration file
+Json load_config_file(fs::path const &path, LoadConfigFileOptions const &opts);
+
+}; // namespace villas
+
+// forward declaration for libjansson's json_t
+struct json_t;
+
+// convert borrowed libjansson
+void to_json(villas::Json &json, json_t const *jansson);
+
+template <> // format nlohmann::json using operator<<
+struct fmt::formatter<villas::Json> : ostream_formatter {};
+
+template <> // format json_pointer using operator<<
+struct fmt::formatter<villas::JsonPointer> : ostream_formatter {};

common/include/villas/utils.hpp

@@ -131,6 +131,10 @@ template <class... Ts> struct overloaded : Ts... {
 // Explicit deduction guide (not needed as of C++20)
 template <class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
 
+// glob-style filesystem pattern matching
+std::vector<fs::path> glob(fs::path const &pattern,
+                           std::span<const fs::path> searchDirectories);
+
 void write_to_file(std::string data, const fs::path file);
 
 namespace base64 {

common/lib/CMakeLists.txt

@@ -15,6 +15,7 @@ add_library(villas-common SHARED
     cpuset.cpp
     dsp/pid.cpp
     hist.cpp
+    json.cpp
     kernel/kernel.cpp
     kernel/rt.cpp
     list.cpp
@@ -55,6 +56,7 @@ target_include_directories(villas-common PUBLIC
 )
 
 target_link_libraries(villas-common PUBLIC
+    nlohmann_json::nlohmann_json
     PkgConfig::JANSSON
     PkgConfig::UUID
     ${OPENSSL_LIBRARIES}