Add Nameof helper utility

2021-06-17 14:09:01 +02:00
parent 4de3d134c9
commit f0cb979c5e
1 changed files with 95 additions and 0 deletions
--- a/Source/Engine/Utilities/Nameof.h
+++ b/Source/Engine/Utilities/Nameof.h
@@ -0,0 +1,95 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Core/Types/StringView.h"
+
+// Helper utility to get type name at compile time. Example:
+// constexpr StringAnsiView name = Nameof::Get<PlatformType>()
+
+namespace Nameof
+{
+    // [Reference: https://github.com/Neargye/nameof]
+    constexpr StringAnsiView PrettyName(StringAnsiView name) noexcept
+    {
+        if (name.Length() >= 1 && (name.Get()[0] == '"' || name.Get()[0] == '\''))
+            return {};
+        if (name.Length() >= 2 && name.Get()[0] == 'R' && (name.Get()[1] == '"' || name.Get()[1] == '\''))
+            return {};
+        if (name.Length() >= 2 && name.Get()[0] == 'L' && (name.Get()[1] == '"' || name.Get()[1] == '\''))
+            return {};
+        if (name.Length() >= 2 && name.Get()[0] == 'U' && (name.Get()[1] == '"' || name.Get()[1] == '\''))
+            return {};
+        if (name.Length() >= 2 && name.Get()[0] == 'u' && (name.Get()[1] == '"' || name.Get()[1] == '\''))
+            return {};
+        if (name.Length() >= 3 && name.Get()[0] == 'u' && name.Get()[1] == '8' && (name.Get()[2] == '"' || name.Get()[2] == '\''))
+            return {};
+        if (name.Length() >= 1 && (name.Get()[0] >= '0' && name.Get()[0] <= '9'))
+            return {};
+        for (int32 i = name.Length(), h = 0, s = 0; i > 0; --i)
+        {
+            if (name.Get()[i - 1] == ')')
+            {
+                ++h;
+                ++s;
+                continue;
+            }
+            if (name.Get()[i - 1] == '(')
+            {
+                --h;
+                ++s;
+                continue;
+            }
+            if (h == 0)
+            {
+                name = StringAnsiView(*name, name.Length() - s);
+                break;
+            }
+            ++s;
+        }
+        int32 s = 0;
+        for (int32 i = name.Length(), h = 0; i > 0; --i)
+        {
+            if (name.Get()[i - 1] == '>')
+            {
+                ++h;
+                ++s;
+                continue;
+            }
+            if (name.Get()[i - 1] == '<')
+            {
+                --h;
+                ++s;
+                continue;
+            }
+            if (h == 0)
+                break;
+            ++s;
+        }
+        for (int32 i = name.Length() - s; i > 0; --i)
+        {
+            if (!((name.Get()[i - 1] >= '0' && name.Get()[i - 1] <= '9') || (name.Get()[i - 1] >= 'a' && name.Get()[i - 1] <= 'z') || (name.Get()[i - 1] >= 'A' && name.Get()[i - 1] <= 'Z') || (name.Get()[i - 1] == '_')))
+            {
+                name = StringAnsiView(*name + i, name.Length() - i);
+                break;
+            }
+        }
+        name = StringAnsiView(*name, name.Length() - s);
+        if (name.Length() > 0 && ((name.Get()[0] >= 'a' && name.Get()[0] <= 'z') || (name.Get()[0] >= 'A' && name.Get()[0] <= 'Z') || (name.Get()[0] == '_')))
+            return name;
+        return {};
+    }
+
+    // Gets the type name as constant expression (compile-time string)
+    template<typename T>
+    constexpr StringAnsiView Get() noexcept
+    {
+#if defined(__clang__) || defined(__GNUC__)
+        return PrettyName(StringAnsiView(__PRETTY_FUNCTION__, sizeof(__PRETTY_FUNCTION__) - 2));
+#elif defined(_MSC_VER)
+        return PrettyName(StringAnsiView(__FUNCSIG__, sizeof(__FUNCSIG__) - 17));
+#else
+#error "Unsupported compiler."
+#endif
+    }
+}