Fixed json parsing with hexadecimal characters

* replace \x with \u00 to follow JSON spec
* fixes #2475 and #2495
* added unit tests for json parsing

test/JsonParser.cpp

@@ -0,0 +1,45 @@
+#include "util/json.hpp"
+
+#if __has_include(<catch2/catch_test_macros.hpp>)
+#include <catch2/catch_test_macros.hpp>
+#else
+#include <catch2/catch.hpp>
+#endif
+
+TEST_CASE("Simple json", "[json]") {
+  SECTION("Parse simple json") {
+    std::string stringToTest = R"({"number": 5, "string": "test"})";
+    waybar::util::JsonParser parser;
+    Json::Value jsonValue = parser.parse(stringToTest);
+    REQUIRE(jsonValue["number"].asInt() == 5);
+    REQUIRE(jsonValue["string"].asString() == "test");
+  }
+}
+
+TEST_CASE("Json with unicode", "[json]") {
+  SECTION("Parse json with unicode") {
+    std::string stringToTest = R"({"test": "\xab"})";
+    waybar::util::JsonParser parser;
+    Json::Value jsonValue = parser.parse(stringToTest);
+    // compare with "\u00ab" because "\xab" is replaced with "\u00ab" in the parser
+    REQUIRE(jsonValue["test"].asString() == "\u00ab");
+  }
+}
+
+TEST_CASE("Json with emoji", "[json]") {
+  SECTION("Parse json with emoji") {
+    std::string stringToTest = R"({"test": "😊"})";
+    waybar::util::JsonParser parser;
+    Json::Value jsonValue = parser.parse(stringToTest);
+    REQUIRE(jsonValue["test"].asString() == "😊");
+  }
+}
+
+TEST_CASE("Json with chinese characters", "[json]") {
+  SECTION("Parse json with chinese characters") {
+    std::string stringToTest = R"({"test": "你好"})";
+    waybar::util::JsonParser parser;
+    Json::Value jsonValue = parser.parse(stringToTest);
+    REQUIRE(jsonValue["test"].asString() == "你好");
+  }
+}

test/meson.build

@@ -8,6 +8,7 @@ test_dep = [
 ]
 test_src = files(
     'main.cpp',
+    'JsonParser.cpp',
     'SafeSignal.cpp',
     'config.cpp',
     '../src/config.cpp',