Extracted json_utils.hpp from utils.hpp (#975)

To avoid utils.hpp dependency on nlohmann_json

Author: ilya-lavrenov

src/cpp/src/generation_config.cpp

@@ -7,6 +7,7 @@
 #include <nlohmann/json.hpp>
 #include <openvino/runtime/core.hpp>
 #include "openvino/genai/generation_config.hpp"
+#include "json_utils.hpp"
 #include "utils.hpp"
 
 

src/cpp/src/group_beam_searcher.cpp

@@ -3,9 +3,10 @@
 
 #include <openvino/runtime/tensor.hpp>
 
+#include <cassert>
+
 #include "openvino/genai/llm_pipeline.hpp"
 #include "utils.hpp"
-
 namespace {
 
 // Modifyed Knuth–Morris–Pratt algorithm which returns tokens following after every needle occurance in haystack

src/cpp/src/json_utils.hpp

@@ -0,0 +1,45 @@
+
+// Copyright (C) 2023-2024 Intel Corporation
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <nlohmann/json.hpp>
+
+namespace ov {
+namespace genai {
+namespace utils {
+
+/// @brief reads value to param if T argument type is aligned with value stores in json
+/// if types are not compatible leave param unchanged
+template <typename T>
+void read_json_param(const nlohmann::json& data, const std::string& name, T& param) {
+    if (data.contains(name)) {
+        if (data[name].is_number() || data[name].is_boolean() || data[name].is_string() || data[name].is_object()) {
+            param = data[name].get<T>();
+        }
+    } else if (name.find(".") != std::string::npos) {
+        size_t delimiter_pos = name.find(".");
+        std::string key = name.substr(0, delimiter_pos);
+        if (!data.contains(key)) {
+            return;
+        }
+        std::string rest_key = name.substr(delimiter_pos + 1);
+
+        read_json_param(data[key], rest_key, param);
+    }
+}
+
+template <typename V>
+void read_json_param(const nlohmann::json& data, const std::string& name, std::vector<V>& param) {
+    if (data.contains(name) && data[name].is_array()) {
+        param.resize(0);
+        for (const auto elem : data[name]) {
+            param.push_back(elem.get<V>());
+        }
+    }
+}
+
+}  // namespace utils
+}  // namespace genai
+}  // namespace ov

src/cpp/src/llm_pipeline_static.cpp

@@ -13,6 +13,7 @@
 #include <jinja2cpp/user_callable.h>
 
 #include "text_callback_streamer.hpp"
+#include "json_utils.hpp"
 #include "utils.hpp"
 
 namespace {

src/cpp/src/text2image/diffusion_pipeline.hpp

@@ -8,8 +8,7 @@
 #include "text2image/schedulers/ischeduler.hpp"
 #include "openvino/genai/text2image/pipeline.hpp"
 
-#include "utils.hpp"
-
+#include "json_utils.hpp"
 namespace {
 
 void batch_copy(ov::Tensor src, ov::Tensor dst, size_t src_batch, size_t dst_batch, size_t batch_size = 1) {

src/cpp/src/text2image/models/autoencoder_kl.cpp

@@ -13,9 +13,8 @@
 #include "openvino/op/multiply.hpp"
 #include "openvino/op/constant.hpp"
 
-#include "utils.hpp"
+#include "json_utils.hpp"
 #include "lora_helper.hpp"
-
 namespace ov {
 namespace genai {
 

src/cpp/src/text2image/models/clip_text_model.cpp

@@ -7,7 +7,7 @@
 
 #include "openvino/runtime/core.hpp"
 
-#include "utils.hpp"
+#include "json_utils.hpp"
 #include "lora_helper.hpp"
 
 namespace ov {

src/cpp/src/text2image/models/clip_text_model_with_projection.cpp

@@ -7,7 +7,7 @@
 
 #include "openvino/runtime/core.hpp"
 
-#include "utils.hpp"
+#include "json_utils.hpp"
 
 namespace ov {
 namespace genai {

src/cpp/src/text2image/models/unet2d_condition_model.cpp

@@ -7,7 +7,7 @@
 
 #include "openvino/runtime/core.hpp"
 
-#include "utils.hpp"
+#include "json_utils.hpp"
 #include "lora_helper.hpp"
 
 namespace ov {

src/cpp/src/text2image/schedulers/ddim.cpp

@@ -7,7 +7,6 @@
 #include <iterator>
 
 #include "text2image/schedulers/ddim.hpp"
-#include "utils.hpp"
 #include "text2image/numpy_utils.hpp"
 
 namespace ov {