From 13d063915e404b7488dcea5162ad85d717759961 Mon Sep 17 00:00:00 2001
From: sha512sum <linuxnyasha@tutanota.com>
Date: Sun, 10 Nov 2024 14:56:41 +0000
Subject: [PATCH] Add serialization and deserialization for vector

---
 library/include/larra/serialization.hpp      | 43 +++++++++++++++++++-
 library/include/larra/serialization/auto.hpp | 20 +++++++++
 tests/serialization.cpp                      | 27 ++++++++++++
 3 files changed, 88 insertions(+), 2 deletions(-)

diff --git a/library/include/larra/serialization.hpp b/library/include/larra/serialization.hpp
index a24e0a8..25a0bd6 100644
--- a/library/include/larra/serialization.hpp
+++ b/library/include/larra/serialization.hpp
@@ -4,6 +4,7 @@
 
 #include <larra/serialization/error.hpp>
 #include <nameof.hpp>
+#include <ranges>
 #include <string>
 #include <utempl/utils.hpp>
 
@@ -169,8 +170,8 @@ struct Serialization<std::variant<Ts...>> : SerializationBase<> {
   }
   static constexpr auto Serialize(xmlpp::Element* element, const std::variant<Ts...>& object) -> void {
     std::visit(
-        [&](const auto& object) {
-          element << object;
+        [&]<typename T>(const T& object) {
+          Serialization<T>::Serialize(element, object);
         },
         object);
   }
@@ -191,4 +192,42 @@ struct Serialization<std::monostate> : SerializationBase<> {
   }
 };
 
+template <typename T>
+struct Serialization<std::vector<T>> : SerializationBase<> {
+  static constexpr auto Parse(xmlpp::Element* element) -> std::vector<T> {
+    return element->get_children(Serialization<T>::kDefaultName) | std::views::transform([](xmlpp::Node* node) {
+             auto itemElement = dynamic_cast<xmlpp::Element*>(node);
+             if(!itemElement) {
+               throw serialization::ParsingError{"Can't convert xmlpp::Node to xmlpp::Element ]"};
+             }
+             return Serialization<T>::Parse(itemElement);
+           }) |
+           std::ranges::to<std::vector<T>>();
+  }
+  static constexpr auto TryParse(xmlpp::Element* element) -> std::optional<std::vector<T>> {
+    auto chd = element->get_children(Serialization<T>::kDefaultName);
+    auto range = chd | std::views::transform([](xmlpp::Node* node) -> std::optional<T> {
+                   auto itemElement = dynamic_cast<xmlpp::Element*>(node);
+                   if(!itemElement) {
+                     return std::nullopt;
+                   }
+                   return Serialization<T>::TryParse(itemElement);
+                 });
+    std::vector<T> response;
+    response.reserve(chd.size());
+    for(auto& value : range) {
+      if(!value) {
+        return std::nullopt;
+      }
+      response.push_back(std::move(*value));
+    }
+    return response;
+  }
+  static constexpr auto Serialize(xmlpp::Element* node, const std::vector<T>& value) -> void {
+    for(const T& element : value) {
+      Serialization<T>::Serialize(node->add_child_element(Serialization<T>::kDefaultName), element);
+    }
+  }
+};
+
 }  // namespace larra::xmpp
diff --git a/library/include/larra/serialization/auto.hpp b/library/include/larra/serialization/auto.hpp
index 6d85d72..83dc3ab 100644
--- a/library/include/larra/serialization/auto.hpp
+++ b/library/include/larra/serialization/auto.hpp
@@ -4,6 +4,7 @@
 #include <boost/pfr.hpp>
 #include <larra/serialization.hpp>
 #include <larra/serialization/error.hpp>
+#include <ranges>
 #include <utempl/constexpr_string.hpp>
 #include <utempl/tuple.hpp>
 #include <utempl/utils.hpp>
@@ -154,6 +155,25 @@ struct ElementSerializer {
   }
 };
 
+template <typename T, auto& Config, typename Info>
+struct ElementSerializer<std::vector<T>, Config, Info> {
+  static constexpr auto Parse(xmlpp::Element* element) {
+    try {
+      return Serialization<std::vector<T>>::Parse(element);
+    } catch(const std::exception& error) {
+      throw ElementParsingError(
+          std::format("[{}: {}] parsing error: [ {} ]", Info::kName, nameof::nameof_full_type<std::vector<T>>(), error.what()));
+    }
+  }
+  static constexpr auto Serialize(xmlpp::Element* node, const std::vector<T>& element) {
+    try {
+      return Serialization<std::vector<T>>::Serialize(node, element);
+    } catch(const std::exception& error) {
+      throw ElementSerializaionError(
+          std::format("[{}: {}] serialization error: [ {} ]", Info::kName, nameof::nameof_full_type<std::vector<T>>(), error.what()));
+    }
+  }
+};
 namespace impl {
 
 template <typename T>
diff --git a/tests/serialization.cpp b/tests/serialization.cpp
index 3e724a9..7221a49 100644
--- a/tests/serialization.cpp
+++ b/tests/serialization.cpp
@@ -37,6 +37,7 @@ struct SomeStruct {
   std::string value;
   [[nodiscard]] static auto Parse(xmlpp::Element* element) -> SomeStruct;
   friend auto operator<<(xmlpp::Element* element, const SomeStruct& self);
+  constexpr auto operator==(const SomeStruct&) const -> bool = default;
 };
 
 struct SomeStruct2 {
@@ -65,6 +66,12 @@ struct SomeStruct5 {
   friend auto operator<<(xmlpp::Element* element, const SomeStruct5& self);
 };
 
+struct SomeStruct6 {
+  static constexpr auto kDefaultName = "some6";
+  std::vector<SomeStruct> some;
+  [[nodiscard]] static auto Parse(xmlpp::Element* element) -> SomeStruct6;
+};
+
 }  // namespace tests::serialization
 
 namespace serialization {
@@ -81,6 +88,9 @@ constexpr auto kSerializationConfig<tests::serialization::SomeStruct4> = Seriali
 template <>
 constexpr auto kSerializationConfig<tests::serialization::SomeStruct5> = SerializationConfig<tests::serialization::SomeStruct5>{};
 
+template <>
+constexpr auto kSerializationConfig<tests::serialization::SomeStruct6> =
+    SerializationConfig<tests::serialization::SomeStruct6>{}.With<"some">({Config<std::vector<tests::serialization::SomeStruct>>{}});
 }  // namespace serialization
 
 namespace tests::serialization {
@@ -105,6 +115,10 @@ auto SomeStruct5::Parse(xmlpp::Element* element) -> SomeStruct5 {
   return ::larra::xmpp::serialization::Parse<tests::serialization::SomeStruct5>(element);
 }
 
+auto SomeStruct6::Parse(xmlpp::Element* element) -> SomeStruct6 {
+  return ::larra::xmpp::serialization::Parse<tests::serialization::SomeStruct6>(element);
+}
+
 auto operator<<(xmlpp::Element* element, const SomeStruct& self) {
   ::larra::xmpp::serialization::Serialize(element, self);
 }
@@ -144,6 +158,19 @@ TEST(AutoParse, Attribute) {
   EXPECT_EQ(a.value.username, "user"sv);
 }
 
+TEST(AutoParse, Vector) {
+  xmlpp::Document doc;
+  auto node = doc.create_root_node("some6");
+  for(auto i : std::views::iota(0, 10)) {
+    auto child = node->add_child_element("some");
+    child->set_attribute("value", std::format("Hello {}", i));
+  }
+  auto value = Serialization<tests::serialization::SomeStruct6>::Parse(node);
+  EXPECT_EQ(value.some, std::views::iota(0, 10) | std::views::transform([](auto i) -> tests::serialization::SomeStruct {
+                          return {.value = std::format("Hello {}", i)};
+                        }) | std::ranges::to<std::vector<tests::serialization::SomeStruct>>());
+}
+
 TEST(AutoSerialize, Basic) {
   xmlpp::Document doc;
   auto node = doc.create_root_node("some2");