From 3ab1e4c504f2175227fdf408db52a7dc3f490b7d Mon Sep 17 00:00:00 2001
From: qicosmos <qicosmos@linux.alibaba.com>
Date: Sat, 15 Jul 2023 22:38:05 +0800
Subject: [PATCH] Update iguana (#368)

---
 include/ylt/struct_xml/xml_reader.h          |  10 ++
 include/ylt/struct_xml/xml_writer.h          |   4 +-
 include/ylt/thirdparty/iguana/reflection.hpp |   2 +-
 include/ylt/thirdparty/iguana/xml_reader.hpp |   2 +-
 include/ylt/thirdparty/iguana/xml_writer.hpp | 100 +++++++++++--------
 src/struct_xml/examples/main.cpp             |  20 +++-
 6 files changed, 92 insertions(+), 46 deletions(-)

diff --git a/include/ylt/struct_xml/xml_reader.h b/include/ylt/struct_xml/xml_reader.h
index 05b9f5540..d5488e0c3 100644
--- a/include/ylt/struct_xml/xml_reader.h
+++ b/include/ylt/struct_xml/xml_reader.h
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 #pragma once
+#include <iguana/util.hpp>
 #include <iguana/xml_reader.hpp>
 
 namespace struct_xml {
@@ -32,4 +33,13 @@ template <typename T, typename map_type = std::unordered_map<std::string_view,
                                                              std::string_view>>
 using xml_attr_t = iguana::xml_attr_t<T, map_type>;
 
+template <typename T>
+inline constexpr std::string_view type_string() {
+  return iguana::type_string<T>();
+}
+
+template <auto T>
+inline constexpr std::string_view enum_string() {
+  return iguana::enum_string<T>();
+}
 }  // namespace struct_xml
\ No newline at end of file
diff --git a/include/ylt/struct_xml/xml_writer.h b/include/ylt/struct_xml/xml_writer.h
index c8c3f75ce..dbe964e3c 100644
--- a/include/ylt/struct_xml/xml_writer.h
+++ b/include/ylt/struct_xml/xml_writer.h
@@ -17,9 +17,9 @@
 #include <iguana/xml_writer.hpp>
 
 namespace struct_xml {
-template <typename Stream, typename T>
+template <bool pretty = false, typename Stream, typename T>
 inline void to_xml(T &&t, Stream &s) {
-  iguana::to_xml(std::forward<T>(t), s);
+  iguana::to_xml<pretty>(std::forward<T>(t), s);
 }
 
 }  // namespace struct_xml
\ No newline at end of file
diff --git a/include/ylt/thirdparty/iguana/reflection.hpp b/include/ylt/thirdparty/iguana/reflection.hpp
index 42ed4bb59..5712c786b 100644
--- a/include/ylt/thirdparty/iguana/reflection.hpp
+++ b/include/ylt/thirdparty/iguana/reflection.hpp
@@ -17,10 +17,10 @@
 #include <variant>
 #include <vector>
 
-#include "../frozen/string.h"
 #include "detail/itoa.hpp"
 #include "detail/string_stream.hpp"
 #include "detail/traits.hpp"
+#include "frozen/string.h"
 #include "frozen/unordered_map.h"
 
 namespace iguana::detail {
diff --git a/include/ylt/thirdparty/iguana/xml_reader.hpp b/include/ylt/thirdparty/iguana/xml_reader.hpp
index e5e8d0ae6..a65e1f549 100644
--- a/include/ylt/thirdparty/iguana/xml_reader.hpp
+++ b/include/ylt/thirdparty/iguana/xml_reader.hpp
@@ -306,7 +306,7 @@ IGUANA_INLINE void parse_item(T &value, It &&it, It &&end,
         key_set.append(key).append(", ");
       }
     }
-    if (skip_till_key<cdata_idx>(value, it, end)) {
+    if (skip_till_key<cdata_idx>(value, it, end)) [[unlikely]] {
       match_close_tag(it, end, name);
       parse_done = true;
       return;
diff --git a/include/ylt/thirdparty/iguana/xml_writer.hpp b/include/ylt/thirdparty/iguana/xml_writer.hpp
index 6084f893e..e5bb10c67 100644
--- a/include/ylt/thirdparty/iguana/xml_writer.hpp
+++ b/include/ylt/thirdparty/iguana/xml_writer.hpp
@@ -6,19 +6,28 @@
 
 namespace iguana {
 
-template <typename Stream, refletable T>
+template <bool pretty, size_t spaces, typename Stream, refletable T>
 IGUANA_INLINE void render_xml_value(Stream &ss, T &&t, std::string_view name);
 
-template <typename Stream>
-inline void render_tail(Stream &ss, std::string_view str) {
+template <bool pretty, size_t spaces, typename Stream>
+IGUANA_INLINE void render_tail(Stream &ss, std::string_view str) {
+  if constexpr (pretty) {
+    ss.append(spaces, '\t');
+  }
   ss.push_back('<');
   ss.push_back('/');
   ss.append(str.data(), str.size());
   ss.push_back('>');
+  if constexpr (pretty) {
+    ss.push_back('\n');
+  }
 }
 
-template <typename Stream>
+template <bool pretty, size_t spaces, typename Stream>
 inline void render_head(Stream &ss, std::string_view str) {
+  if constexpr (pretty) {
+    ss.append(spaces, '\t');
+  }
   ss.push_back('<');
   ss.append(str.data(), str.size());
   ss.push_back('>');
@@ -48,8 +57,11 @@ IGUANA_INLINE void render_value(Stream &ss, const T &value) {
   }
 }
 
-template <typename Stream, map_container T>
+template <bool pretty, size_t spaces, typename Stream, map_container T>
 inline void render_xml_attr(Stream &ss, const T &value, std::string_view name) {
+  if constexpr (pretty) {
+    ss.append(spaces, '\t');
+  }
   ss.push_back('<');
   ss.append(name.data(), name.size());
   for (auto [k, v] : value) {
@@ -63,61 +75,62 @@ inline void render_xml_attr(Stream &ss, const T &value, std::string_view name) {
   ss.push_back('>');
 }
 
-template <typename Stream, attr_t T>
-IGUANA_INLINE void render_xml_value(Stream &ss, const T &value,
-                                    std::string_view name) {
-  render_xml_attr(ss, value.attr(), name);
-  render_xml_value(ss, value.value(), name);
-  render_tail(ss, name);
-}
-
-template <typename Stream, plain_t T>
+template <bool pretty, size_t spaces, typename Stream, plain_t T>
 IGUANA_INLINE void render_xml_value(Stream &ss, const T &value,
                                     std::string_view name) {
   render_value(ss, value);
-  render_tail(ss, name);
+  render_tail<pretty, 0>(ss, name);
 }
 
-template <typename Stream, optional_t T>
+template <bool pretty, size_t spaces, typename Stream, optional_t T>
 IGUANA_INLINE void render_xml_value(Stream &ss, const T &value,
                                     std::string_view name) {
   if (value) {
-    render_xml_value(ss, *value, name);
+    render_xml_value<pretty, spaces>(ss, *value, name);
   }
   else {
-    render_tail(ss, name);
+    render_tail<pretty, 0>(ss, name);
   }
 }
 
-template <typename Stream, unique_ptr_t T>
+template <bool pretty, size_t spaces, typename Stream, unique_ptr_t T>
 IGUANA_INLINE void render_xml_value(Stream &ss, const T &value,
                                     std::string_view name) {
   if (value) {
-    render_xml_value(ss, *value, name);
+    render_xml_value<pretty, spaces>(ss, *value, name);
   }
   else {
-    render_tail(ss, name);
+    render_tail<pretty, 0>(ss, name);
   }
 }
 
-template <typename Stream, sequence_container_t T>
+template <bool pretty, size_t spaces, typename Stream, attr_t T>
+IGUANA_INLINE void render_xml_value(Stream &ss, const T &value,
+                                    std::string_view name) {
+  render_xml_attr<pretty, spaces>(ss, value.attr(), name);
+  render_xml_value<pretty, spaces>(ss, value.value(), name);
+}
+
+template <bool pretty, size_t spaces, typename Stream, sequence_container_t T>
 IGUANA_INLINE void render_xml_value(Stream &ss, const T &value,
                                     std::string_view name) {
   using value_type = typename std::remove_cvref_t<T>::value_type;
   for (const auto &v : value) {
     if constexpr (attr_t<value_type>) {
-      render_xml_attr(ss, v.attr(), name);
-      render_xml_value(ss, v.value(), name);
+      render_xml_value<pretty, spaces>(ss, v, name);
     }
     else {
-      render_head(ss, name);
-      render_xml_value(ss, v, name);
+      render_head<pretty, spaces>(ss, name);
+      render_xml_value<pretty, spaces>(ss, v, name);
     }
   }
 }
 
-template <typename Stream, refletable T>
+template <bool pretty, size_t spaces, typename Stream, refletable T>
 IGUANA_INLINE void render_xml_value(Stream &ss, T &&t, std::string_view name) {
+  if constexpr (pretty) {
+    ss.push_back('\n');
+  }
   for_each(std::forward<T>(t),
            [&](const auto &v, auto i) IGUANA__INLINE_LAMBDA {
              using M = decltype(iguana_reflect_members(std::forward<T>(t)));
@@ -129,38 +142,43 @@ IGUANA_INLINE void render_xml_value(Stream &ss, T &&t, std::string_view name) {
                                   get_name<std::decay_t<T>, Idx>().size());
              static_assert(Idx < Count);
              if constexpr (sequence_container_t<value_type>) {
-               render_xml_value(ss, t.*v, tag_name);
+               render_xml_value<pretty, spaces + 1>(ss, t.*v, tag_name);
              }
              else if constexpr (attr_t<value_type>) {
-               render_xml_attr(ss, (t.*v).attr(), tag_name);
-               render_xml_value(ss, (t.*v).value(), tag_name);
+               render_xml_value<pretty, spaces + 1>(ss, t.*v, tag_name);
              }
              else if constexpr (cdata_t<value_type>) {
-               ss.append("<![CDATA[").append((t.*v).value()).append("]]>");
+               if constexpr (pretty) {
+                 ss.append(spaces + 1, '\t');
+                 ss.append("<![CDATA[").append((t.*v).value()).append("]]>\n");
+               }
+               else {
+                 ss.append("<![CDATA[").append((t.*v).value()).append("]]>");
+               }
              }
              else {
-               render_head(ss, tag_name);
-               render_xml_value(ss, t.*v, tag_name);
+               render_head<pretty, spaces + 1>(ss, tag_name);
+               render_xml_value<pretty, spaces + 1>(ss, t.*v, tag_name);
              }
            });
-  render_tail(ss, name);
+  render_tail<pretty, spaces>(ss, name);
 }
 
-template <typename Stream, attr_t T>
+template <bool pretty = false, typename Stream, attr_t T>
 IGUANA_INLINE void to_xml(T &&t, Stream &s) {
   using value_type = typename std::decay_t<T>::value_type;
+  static_assert(refletable<value_type>, "value_type must be refletable");
   constexpr std::string_view root_name = std::string_view(
       get_name<value_type>().data(), get_name<value_type>().size());
-  render_xml_attr(s, std::forward<T>(t).attr(), root_name);
-  render_xml_value(s, std::forward<T>(t).value(), root_name);
+  render_xml_value<pretty, 0>(s, std::forward<T>(t), root_name);
 }
 
-template <typename Stream, refletable T>
+template <bool pretty = false, typename Stream, refletable T>
 IGUANA_INLINE void to_xml(T &&t, Stream &s) {
   constexpr std::string_view root_name = std::string_view(
       get_name<std::decay_t<T>>().data(), get_name<std::decay_t<T>>().size());
-  render_head(s, root_name);
-  render_xml_value(s, std::forward<T>(t), root_name);
+  render_head<pretty, 0>(s, root_name);
+  render_xml_value<pretty, 0>(s, std::forward<T>(t), root_name);
 }
 
-}  // namespace iguana
\ No newline at end of file
+}  // namespace iguana
diff --git a/src/struct_xml/examples/main.cpp b/src/struct_xml/examples/main.cpp
index 2815b2712..24b48d517 100644
--- a/src/struct_xml/examples/main.cpp
+++ b/src/struct_xml/examples/main.cpp
@@ -165,7 +165,24 @@ void basic_usage() {
   std::string str;
   struct_xml::to_xml(p, str);
 
-  std::cout << str;
+  std::cout << str << "\n";
+
+  std::string pretty_xml_str;
+  struct_xml::to_xml</*pretty=*/true>(p, pretty_xml_str);
+
+  std::cout << pretty_xml_str;
+}
+
+enum class Color { red, black };
+
+enum Size { small, large };
+
+class my_message {};
+
+void type_to_string() {
+  static_assert(struct_xml::type_string<my_message>() == "my_message");
+  static_assert(struct_xml::enum_string<Color::red>() == "Color::red");
+  static_assert(struct_xml::enum_string<Size::small>() == "small");
 }
 
 void get_error() {
@@ -216,6 +233,7 @@ void required_field() {
 
 int main() {
   basic_usage();
+  type_to_string();
   nested_xml();
   attribute();
   get_error();