From 1d055261b4144dbf86b2658437015b15d4dd9bff Mon Sep 17 00:00:00 2001
From: Richard <q@1bpm.net>
Date: Sun, 4 Sep 2022 00:32:56 +0100
Subject: initial

---
 include/jsoncons_ext/jsonpath/json_query.hpp | 115 +++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 include/jsoncons_ext/jsonpath/json_query.hpp

(limited to 'include/jsoncons_ext/jsonpath/json_query.hpp')

diff --git a/include/jsoncons_ext/jsonpath/json_query.hpp b/include/jsoncons_ext/jsonpath/json_query.hpp
new file mode 100644
index 0000000..8facfa9
--- /dev/null
+++ b/include/jsoncons_ext/jsonpath/json_query.hpp
@@ -0,0 +1,115 @@
+// Copyright 2021 Daniel Parker
+// Distributed under the Boost license, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See https://github.com/danielaparker/jsoncons for latest version
+
+#ifndef JSONCONS_JSONPATH_JSON_QUERY_HPP
+#define JSONCONS_JSONPATH_JSON_QUERY_HPP
+
+#include <jsoncons/json.hpp>
+#include <jsoncons_ext/jsonpath/jsonpath_expression.hpp>
+
+namespace jsoncons { 
+namespace jsonpath {
+     
+    template<class Json>
+    Json json_query(const Json& instance,
+                    const typename Json::string_view_type& path, 
+                    result_options options = result_options(),
+                    const custom_functions<Json>& functions = custom_functions<Json>())
+    {
+        auto expr = make_expression<Json>(path, functions);
+        return expr.evaluate(instance, options);
+    }
+
+    template<class Json,class Callback>
+    typename std::enable_if<type_traits::is_binary_function_object<Callback,const std::basic_string<typename Json::char_type>&,const Json&>::value,void>::type
+    json_query(const Json& instance, 
+               const typename Json::string_view_type& path, 
+               Callback callback,
+               result_options options = result_options(),
+               const custom_functions<Json>& functions = custom_functions<Json>())
+    {
+        auto expr = make_expression<Json>(path, functions);
+        expr.evaluate(instance, callback, options);
+    }
+
+    template<class Json, class T>
+    typename std::enable_if<is_json_type_traits_specialized<Json,T>::value,void>::type
+        json_replace(Json& instance, const typename Json::string_view_type& path, T&& new_value,
+                     result_options options = result_options::nodups,
+                     const custom_functions<Json>& funcs = custom_functions<Json>())
+    {
+        using evaluator_t = typename jsoncons::jsonpath::detail::jsonpath_evaluator<Json, Json&>;
+        //using string_type = typename evaluator_t::string_type;
+        using value_type = typename evaluator_t::value_type;
+        using reference = typename evaluator_t::reference;
+        using json_selector_t = typename evaluator_t::path_expression_type;
+        using json_location_type = typename evaluator_t::json_location_type;
+
+        jsoncons::jsonpath::detail::static_resources<value_type,reference> static_resources(funcs);
+        evaluator_t e;
+        json_selector_t expr = e.compile(static_resources, path);
+
+        jsoncons::jsonpath::detail::dynamic_resources<Json,reference> resources;
+        auto callback = [&new_value](const json_location_type&, reference v)
+        {
+            v = std::forward<T>(new_value);
+        };
+        expr.evaluate(resources, instance, resources.root_path_node(), instance, callback, options);
+    }
+
+    template<class Json, class UnaryCallback>
+    typename std::enable_if<type_traits::is_unary_function_object<UnaryCallback,Json>::value,void>::type
+    json_replace(Json& instance, const typename Json::string_view_type& path , UnaryCallback callback)
+    {
+        using evaluator_t = typename jsoncons::jsonpath::detail::jsonpath_evaluator<Json, Json&>;
+        //using string_type = typename evaluator_t::string_type;
+        using value_type = typename evaluator_t::value_type;
+        using reference = typename evaluator_t::reference;
+        using json_selector_t = typename evaluator_t::path_expression_type;
+        using json_location_type = typename evaluator_t::json_location_type;
+
+        jsoncons::jsonpath::detail::static_resources<value_type,reference> static_resources;
+        evaluator_t e;
+        json_selector_t expr = e.compile(static_resources, path);
+
+        jsoncons::jsonpath::detail::dynamic_resources<Json,reference> resources;
+        auto f = [callback](const json_location_type&, reference v)
+        {
+            v = callback(v);
+        };
+        expr.evaluate(resources, instance, resources.root_path_node(), instance, f, result_options::nodups);
+    }
+
+    template<class Json, class BinaryCallback>
+    typename std::enable_if<type_traits::is_binary_function_object<BinaryCallback,const std::basic_string<typename Json::char_type>&,Json&>::value,void>::type
+    json_replace(Json& instance, const typename Json::string_view_type& path , BinaryCallback callback, 
+                 result_options options = result_options::nodups,
+                 const custom_functions<Json>& funcs = custom_functions<Json>())
+    {
+        using evaluator_t = typename jsoncons::jsonpath::detail::jsonpath_evaluator<Json, Json&>;
+        //using string_type = typename evaluator_t::string_type;
+        using value_type = typename evaluator_t::value_type;
+        using reference = typename evaluator_t::reference;
+        using json_selector_t = typename evaluator_t::path_expression_type;
+        using json_location_type = typename evaluator_t::json_location_type;
+
+        jsoncons::jsonpath::detail::static_resources<value_type,reference> static_resources(funcs);
+        evaluator_t e;
+        json_selector_t expr = e.compile(static_resources, path);
+
+        jsoncons::jsonpath::detail::dynamic_resources<Json,reference> resources;
+
+        auto f = [&callback](const json_location_type& path, reference val)
+        {
+            callback(path.to_string(), val);
+        };
+        expr.evaluate(resources, instance, resources.root_path_node(), instance, f, options);
+    }
+
+} // namespace jsonpath
+} // namespace jsoncons
+
+#endif
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