Implement basic SNBT reader and testsuite

lib/nbt/impl/ByteArrayTag.dart

@@ -52,4 +52,16 @@ class ByteArrayTag extends Tag {
     builder.append(
         "${isList ? "".padLeft(indent, '\t') : ""}[B; ${value.join("B, ")}B]");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    reader.expect("[");
+    while (reader.peek() != "]") {
+      value.add(int.parse(reader.readNumber()));
+      reader.expect("b");
+
+      if (reader.peek() == ",") reader.next();
+    }
+    reader.expect("]");
+  }
 }

lib/nbt/impl/ByteTag.dart

@@ -39,4 +39,12 @@ class ByteTag extends Tag {
   void writeStringifiedValue(StringBuilder builder, int indent, bool isList) {
     builder.append("${value}b");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    String val = reader.readNumber();
+    value = int.parse(val);
+
+    reader.expect("b");
+  }
 }

lib/nbt/impl/CompoundTag.dart

@@ -190,4 +190,16 @@ class CompoundTag extends Tag implements Map<String, Tag> {
 
   @override
   Iterable<Tag> get values => value.values;
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    reader.expect("{");
+
+    while (reader.peek() != "}") {
+      Tag tag = Tag.readStringifiedNamedTag(reader);
+      put(tag.getKey(), tag);
+    }
+
+    reader.expect("}");
+  }
 }

lib/nbt/impl/DoubleTag.dart

@@ -39,4 +39,12 @@ class DoubleTag extends Tag {
   void writeStringifiedValue(StringBuilder builder, int indent, bool isList) {
     builder.append("${isList ? "".padLeft(indent, '\t') : ""}${value}d");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    double val = double.parse(reader.readNumber());
+    value = val;
+
+    reader.expect("d");
+  }
 }

lib/nbt/impl/EndTag.dart

@@ -22,4 +22,7 @@ class EndTag extends Tag {
 
   @override
   void writeStringifiedValue(StringBuilder builder, int indent, bool isList) {}
+
+  @override
+  void readStringifiedValue(StringReader reader) {}
 }

lib/nbt/impl/FloatTag.dart

@@ -38,4 +38,12 @@ class FloatTag extends Tag {
   void writeStringifiedValue(StringBuilder builder, int indent, bool isList) {
     builder.append("${isList ? "".padLeft(indent, '\t') : ""}${value}f");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    double val = double.parse(reader.readNumber());
+    value = val;
+
+    reader.expect("f");
+  }
 }

lib/nbt/impl/IntArrayTag.dart

@@ -51,4 +51,15 @@ class IntArrayTag extends Tag {
     builder.append(
         "${isList ? "".padLeft(indent, '\t') : ""}[I; ${value.join('I, ')}I]");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    reader.expect("[");
+    while (reader.peek() != "]") {
+      value.add(int.parse(reader.readNumber()));
+
+      if (reader.peek() == ",") reader.next();
+    }
+    reader.expect("]");
+  }
 }

lib/nbt/impl/IntTag.dart

@@ -38,4 +38,10 @@ class IntTag extends Tag {
   void writeStringifiedValue(StringBuilder builder, int indent, bool isList) {
     builder.append("${isList ? "".padLeft(indent, '\t') : ""}${value}i");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    String val = reader.readNumber();
+    value = int.parse(val);
+  }
 }

lib/nbt/impl/ListTag.dart

@@ -103,4 +103,15 @@ class ListTag extends Tag {
     }
     builder.append("\n${"".padLeft(indent - 1, '\t')}]");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    reader.expect("[");
+    while (reader.peek() != "]") {
+      value.add(Tag.readStringifiedNamedTag(reader));
+
+      if (reader.peek() == ",") reader.next();
+    }
+    reader.expect("]");
+  }
 }

lib/nbt/impl/LongArrayTag.dart

@@ -55,4 +55,16 @@ class LongArrayTag extends Tag {
     builder.append(
         "${isList ? "".padLeft(indent, '\t') : ""}[L; ${value.join('L, ')}L]");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    reader.expect("[");
+    while (reader.peek() != "]") {
+      value.add(int.parse(reader.readNumber()));
+      reader.expect("l");
+
+      if (reader.peek() == ",") reader.next();
+    }
+    reader.expect("]");
+  }
 }

lib/nbt/impl/LongTag.dart

@@ -38,4 +38,12 @@ class LongTag extends Tag {
   void writeStringifiedValue(StringBuilder builder, int indent, bool isList) {
     builder.append("${isList ? "".padLeft(indent, '\t') : ""}${value}L");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    int val = int.parse(reader.readNumber());
+    value = val;
+
+    reader.expect("l");
+  }
 }

lib/nbt/impl/ShortTag.dart

@@ -38,4 +38,12 @@ class ShortTag extends Tag {
   void writeStringifiedValue(StringBuilder builder, int indent, bool isList) {
     builder.append("${isList ? "".padLeft(indent, '\t') : ""}${value}S");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    int val = int.parse(reader.readNumber());
+    value = val;
+
+    reader.expect("s");
+  }
 }

lib/nbt/impl/StringTag.dart

@@ -38,4 +38,10 @@ class StringTag extends Tag {
   void writeStringifiedValue(StringBuilder builder, int indent, bool isList) {
     builder.append("${isList ? "".padLeft(indent, '\t') : ""}\"${value}\"");
   }
+
+  @override
+  void readStringifiedValue(StringReader reader) {
+    String str = reader.readString();
+    value = str;
+  }
 }