patterns/nbt: Added NBT pattern

patterns/nbt.hexpat

@@ -0,0 +1,70 @@
+#include <std/sys.pat>
+
+#pragma endian big
+
+enum Tag : u8 {
+    End = 0,
+    Byte = 1,
+    Short = 2,
+    Int = 3,
+    Long = 4,
+    Float = 5,
+    Double = 6,
+    ByteArray = 7,
+    String = 8,
+    List = 9,
+    Compound = 10,
+    IntArray = 11,
+    LongArray = 12
+};
+
+using Element;
+
+struct Value {
+    if (parent.tag == Tag::Byte)
+        s8 value;
+    else if (parent.tag == Tag::Short)
+        s16 value;
+    else if (parent.tag == Tag::Int)
+        s32 value;
+    else if (parent.tag == Tag::Long)
+        s64 value;
+    else if (parent.tag == Tag::Float)
+        float value;
+    else if (parent.tag == Tag::Double)
+        double value;
+    else if (parent.tag == Tag::ByteArray) {
+        s32 arrayLength;
+        s8 value[arrayLength] [[sealed]];
+    } else if (parent.tag == Tag::String) {
+        u16 stringLength;
+        char value[stringLength];
+    } else if (parent.tag == Tag::List) {
+        Tag tag;
+        s32 listLength;
+        Value values[listLength] [[static]];
+    } else if (parent.tag == Tag::Compound) {       
+        Element values[while(true)];
+    } else {
+        std::error(std::format("Invalid tag {:02X}", TypeTag));
+    }
+} [[inline]];
+
+struct Element {
+    Tag tag;
+    if (tag == Tag::End)
+        break;
+    else {
+
+        u16 nameLength;
+        char name[nameLength];
+            
+        Value value;
+    }
+};
+
+struct NBT {
+    Element element[while(true)] [[inline]];
+};
+
+NBT nbt @ 0x00;