Use dedicated AssetIdentifier instead of string

GlitchyEngine/src/Content/AssetIdentifier.bf

@@ -0,0 +1,84 @@
+using System;
+
+namespace GlitchyEngine.Content;
+
+public class AssetIdentifier
+{
+	private String _fullIdentifier ~ delete:append _;
+
+	private int _subassetSeperator;
+
+	public StringView FullIdentifier => _fullIdentifier;
+	public StringView AssetIdentifier => _subassetSeperator > 0 ? StringView(_fullIdentifier, 0, _subassetSeperator) : _fullIdentifier;
+	public StringView SubassetIdentifier => _subassetSeperator > 0 ? StringView(_fullIdentifier, _subassetSeperator + 1) : .();
+
+	[AllowAppend]
+	public this(StringView assetIdentifier)
+	{
+		String identifier = append String(assetIdentifier);
+		_fullIdentifier = identifier;
+
+		Fixup(_fullIdentifier);
+
+		_subassetSeperator = _fullIdentifier.IndexOf(':', 0);
+	}
+
+	[AllowAppend]
+	public this(StringView assetIdentifier, StringView subAssetIdentifier)
+	{
+		String identifier = append String(assetIdentifier.Length + 1 + subAssetIdentifier.Length);
+		identifier.AppendF($"{assetIdentifier}:{subAssetIdentifier}");
+
+		Fixup(identifier);
+
+		_subassetSeperator = _fullIdentifier.IndexOf(':', 0);
+
+	}
+
+	public static StringView operator implicit(AssetIdentifier identifier) => identifier.FullIdentifier;
+
+	public const char8 DirectorySeparatorChar = '/';
+
+	/// Removes or unifies potential platform specific or file-path related stuff in the given asset identifier
+	public static void Fixup(String assetIdentifier)
+	{
+		int dotIndex = 0;
+
+		assetIdentifier.Replace('\\', DirectorySeparatorChar);
+		
+		// Replace /./ stuff
+		while ((dotIndex = assetIdentifier.IndexOf('.', dotIndex)) != -1)
+		{
+			char8 lastChar = '\0';
+			char8 nextChar = '\0';
+
+			int nextIndex = dotIndex + 1;
+			if (nextIndex < assetIdentifier.Length)
+				nextChar = assetIdentifier[nextIndex];
+
+			int lastIndex = dotIndex - 1;
+			if (lastIndex < assetIdentifier.Length)
+				lastChar = assetIdentifier[nextIndex];
+
+			// We either need to have a slash on both sides, or we have to be at the start or end of the string
+			if ((lastChar == '\0' || lastChar == DirectorySeparatorChar) &&
+				(lastChar == '\0' || lastChar == DirectorySeparatorChar))
+			{
+				if (lastChar != '\0')
+					assetIdentifier.Remove(lastIndex, 2);
+				else
+					assetIdentifier.Remove(dotIndex, 2);
+			}
+			else
+			{
+				// Skip the dot
+				dotIndex++;
+			}
+		}
+
+		if (assetIdentifier.StartsWith(DirectorySeparatorChar))
+			assetIdentifier.Remove(0, 1);
+
+		assetIdentifier.EnsureNullTerminator();
+	}
+}