jsonpath jsonpath_expression

test/CMakeLists.txt

@@ -89,6 +89,7 @@ add_executable(unit_tests
                jsonpath/src/jsonpath_flatten_tests.cpp
                jsonpath/src/jsonpath_custom_function_tests.cpp
                jsonpath/src/jsonpath_json_query_tests.cpp
+               jsonpath/src/jsonpath_make_expression_tests.cpp
                jsonpath/src/jsonpath_json_replace_tests.cpp
                jsonpath/src/jsonpath_test_suite.cpp
                jsonpath/src/jsonpath_stateful_allocator_tests.cpp

test/jsonpath/src/jsonpath_make_expression_tests.cpp

@@ -0,0 +1,111 @@
+// Copyright 2013-2023 Daniel Parker
+// Distributed under Boost license
+
+#if defined(_MSC_VER)
+#include "windows.h" // test no inadvertant macro expansions
+#endif
+#include <jsoncons/json.hpp>
+#include <jsoncons_ext/jsonpath/json_query.hpp>
+#include <catch/catch.hpp>
+#include <iostream>
+#include <sstream>
+#include <vector>
+#include <map>
+#include <utility>
+#include <ctime>
+#include <new>
+#include <unordered_set> // std::unordered_set
+#include <fstream>
+
+using namespace jsoncons;
+
+TEST_CASE("jsonpath make_expression test")
+{
+    std::string input = R"(
+    {
+        "books":
+        [
+            {
+                "category": "fiction",
+                "title" : "A Wild Sheep Chase",
+                "author" : "Haruki Murakami",
+                "price" : 22.72
+            },
+            {
+                "category": "fiction",
+                "title" : "The Night Watch",
+                "author" : "Sergei Lukyanenko",
+                "price" : 23.58
+            },
+            {
+                "category": "fiction",
+                "title" : "The Comedians",
+                "author" : "Graham Greene",
+                "price" : 21.99
+            },
+            {
+                "category": "memoir",
+                "title" : "The Night Watch",
+                "author" : "Phillips, David Atlee"
+            }
+        ]
+    }
+    )";
+
+    SECTION("test 1")
+    {
+        int count = 0;
+
+        const json doc = json::parse(input);
+
+        auto expr = jsoncons::jsonpath::make_expression_for_update<json>("$.books[*]");
+
+        auto callback = [&](const std::string& /*path*/, const json& book)
+        {
+            if (book.at("category") == "memoir" && !book.contains("price"))
+            {
+                ++count;
+            }
+        };
+
+        expr.evaluate(doc, callback);
+
+        CHECK(count == 1);
+        CHECK_FALSE(doc["books"][3].contains("price"));
+    }
+
+    SECTION("test 2")
+    {
+        int count = 0;
+
+        json doc = json::parse(input);
+
+        auto expr = jsoncons::jsonpath::make_expression_for_update<json, json&>("$.books[*]");
+
+        auto callback1 = [&](const std::string& /*path*/, const json& book)
+        {
+            if (book.at("category") == "memoir" && !book.contains("price"))
+            {
+                ++count;
+            }
+        };
+
+        auto callback2 = [](const std::string& /*path*/, json& book)
+        {
+            if (book.at("category") == "memoir" && !book.contains("price"))
+            {
+                book.try_emplace("price", 140.0);
+            }
+        };
+
+        expr.evaluate(doc, callback1);
+
+        CHECK(count == 1);
+
+        CHECK_FALSE(doc["books"][3].contains("price"));
+        expr.evaluate_and_update(doc, callback2);
+        CHECK(doc["books"][3].contains("price"));
+        CHECK(doc["books"][3].at("price") == 140);
+    }
+}
+