Initial SNBT implementation

lib/nbt/Tag.dart

@@ -82,6 +82,38 @@ abstract class Tag {
     }
   }
 
+  static void writeStringifiedNamedTag(
+      Tag tag, StringBuilder builder, int indents) {
+    if (tag.getType() != 0) {
+      if (builder != "") {
+        // Write name
+        if (tag.shouldQuoteName()) {
+          builder.append("${"".padLeft(indents, "\t")}\"${tag.getKey()}\": ");
+        } else
+          builder.append("${"".padLeft(indents, '\t')}${tag.getKey()}: ");
+      }
+
+      tag.writeStringifiedValue(builder, indents + 1);
+    }
+  }
+
+  bool shouldQuoteName() {
+    if (getKey() == "") {
+      return false;
+    } else {
+      String letters = "abcdefghijklmnopqrstuvwxyz";
+      for (int i = 0; i < getKey().length; i++) {
+        String digit = getKey().substring(i, i + 1);
+        if (letters.indexOf(digit) == -1) {
+          return true;
+        }
+      }
+      return false;
+    }
+  }
+
+  void writeStringifiedValue(StringBuilder builder, int indent);
+
   bool equals(dynamic object) {
     if (object == null || object is! Tag) return false;