Initial SNBT implementation

lib/nbt/Stream.dart

@@ -377,3 +377,22 @@ class ByteLayer {
     setBit(position, maskToSet);
   }
 }
+
+class StringBuilder {
+  String _buffer = "";
+
+  StringBuilder();
+
+  void append(String value) {
+    _buffer += value;
+  }
+
+  void clear() {
+    _buffer = "";
+  }
+
+  @override
+  String toString() {
+    return "${_buffer}";
+  }
+}

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;
 

lib/nbt/impl/ByteArrayTag.dart

@@ -46,4 +46,9 @@ class ByteArrayTag extends Tag {
     print(
         "${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}: [$array]");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("[B; ${value.join("B, ")}B]");
+  }
 }

lib/nbt/impl/ByteTag.dart

@@ -34,4 +34,9 @@ class ByteTag extends Tag {
     print(
         "${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}: $value");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("${value}b");
+  }
 }

lib/nbt/impl/CompoundTag.dart

@@ -85,4 +85,22 @@ class CompoundTag extends Tag {
   void endPrettyPrint(int indent) {
     print("${"".padLeft(indent, '\t')}}");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    Iterator<Tag> it = value.values.iterator;
+    builder.append("{\n");
+
+    bool firstEntry = true;
+    while (it.moveNext()) {
+      Tag t = it.current;
+      if (firstEntry) {
+        firstEntry = false;
+      } else {
+        builder.append(",\n");
+      }
+      Tag.writeStringifiedNamedTag(t, builder, indent);
+    }
+    builder.append("\n${"".padLeft(indent - 1, '\t')}}\n");
+  }
 }

lib/nbt/impl/DoubleTag.dart

@@ -34,4 +34,9 @@ class DoubleTag extends Tag {
     print(
         "${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}: $value");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("${value}d");
+  }
 }

lib/nbt/impl/EndTag.dart

@@ -19,4 +19,7 @@ class EndTag extends Tag {
   void prettyPrint(int indent, bool recurse) {
     print("${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {}
 }

lib/nbt/impl/FloatTag.dart

@@ -33,4 +33,9 @@ class FloatTag extends Tag {
     print(
         "${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}: $value");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("${value}f");
+  }
 }

lib/nbt/impl/IntArrayTag.dart

@@ -45,4 +45,9 @@ class IntArrayTag extends Tag {
     print(
         "${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}: [$array]");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("[I; ${value.join('I, ')}I]");
+  }
 }

lib/nbt/impl/IntTag.dart

@@ -33,4 +33,9 @@ class IntTag extends Tag {
     print(
         "${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}: $value");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("${value}i");
+  }
 }

lib/nbt/impl/ListTag.dart

@@ -86,4 +86,9 @@ class ListTag extends Tag {
   void endPrettyPrint(int indent) {
     print("${"".padLeft(indent, '\t')}]");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("[\n");
+  }
 }

lib/nbt/impl/LongArrayTag.dart

@@ -49,4 +49,9 @@ class LongArrayTag extends Tag {
     print(
         "${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}: [$array]");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("[L; ${value.join('L, ')}L]");
+  }
 }

lib/nbt/impl/LongTag.dart

@@ -33,4 +33,9 @@ class LongTag extends Tag {
     print(
         "${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}: $value");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("${value}L");
+  }
 }

lib/nbt/impl/ShortTag.dart

@@ -33,4 +33,9 @@ class ShortTag extends Tag {
     print(
         "${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}: $value");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("${value}S");
+  }
 }

lib/nbt/impl/StringTag.dart

@@ -33,4 +33,9 @@ class StringTag extends Tag {
     print(
         "${"".padLeft(indent, '\t')}${Tag.getCanonicalName(getTagType())}: $value");
   }
+
+  @override
+  void writeStringifiedValue(StringBuilder builder, int indent) {
+    builder.append("\"${value}\"");
+  }
 }

test/nbt_test.dart

@@ -3,6 +3,8 @@ import 'dart:io';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:libac_flutter/nbt/NbtIo.dart';
 import 'package:libac_flutter/nbt/NbtUtils.dart';
+import 'package:libac_flutter/nbt/Stream.dart';
+import 'package:libac_flutter/nbt/Tag.dart';
 import 'package:libac_flutter/nbt/impl/CompoundTag.dart';
 import 'package:libac_flutter/nbt/impl/StringTag.dart';
 import 'package:libac_flutter/utils/uuid/UUID.dart';
@@ -55,4 +57,12 @@ void main() {
     var newID = NbtUtils.readUUID(tag, "test");
     expect(id.toString(), newID.toString());
   });
+
+  test("Read HelloWorld, Output to SNBT", () async {
+    CompoundTag ct =
+        await NbtIo.read("${Directory.current.path}/test/hello_world.nbt");
+    StringBuilder sb = StringBuilder();
+    Tag.writeStringifiedNamedTag(ct, sb, 0);
+    print(sb.toString());
+  });
 }