Core/StringExt: Add IterateOnCodepoints to remove std::u32string allocations

src/Nazara/Core/StringExt.cpp

@@ -259,6 +259,29 @@ namespace Nz
 		return {};
 	}
 
+	void IterateOnCodepoints(std::string_view str, FunctionRef<bool(const char32_t* characters, std::size_t characterCount)> callback)
+	{
+		std::array<char32_t, 32> buffer;
+		std::size_t charCount = 0;
+
+		utf8::unchecked::iterator<const char*> it(str.data());
+		utf8::unchecked::iterator<const char*> end(str.data() + str.size());
+		for (; it != end; ++it)
+		{
+			buffer[charCount++] = *it;
+			if (charCount == buffer.size())
+			{
+				if (!callback(&buffer[0], charCount))
+					return;
+
+				charCount = 0;
+			}
+		}
+
+		if (charCount != 0)
+			callback(&buffer[0], charCount);
+	}
+
 	bool MatchPattern(std::string_view str, std::string_view pattern)
 	{
 		if (str.empty() || pattern.empty())