1 files changed, 51 insertions, 0 deletions
diff --git a/JPratt/src/main/java/bjc/pratt/commands/GroupingCommand.java b/JPratt/src/main/java/bjc/pratt/commands/GroupingCommand.java
new file mode 100644
index 0000000..1a8d3c8
--- /dev/null
+++ b/JPratt/src/main/java/bjc/pratt/commands/GroupingCommand.java
@@ -0,0 +1,51 @@
+package bjc.pratt.commands;
+
+import bjc.pratt.ParseBlock;
+import bjc.pratt.ParserContext;
+import bjc.pratt.Token;
+import bjc.utils.data.ITree;
+import bjc.utils.data.Tree;
+import bjc.utils.parserutils.ParserException;
+
+/**
+ * A grouping operator.
+ * 
+ * @author bjculkin
+ *
+ * @param <K>
+ *                The key type of the tokens.
+ * 
+ * @param <V>
+ *                The value type of the tokens.
+ * 
+ * @param <C>
+ *                The state type of the parser.
+ */
+public class GroupingCommand<K, V, C> extends AbstractInitialCommand<K, V, C> {
+	private ParseBlock<K, V, C> innerBlock;
+
+	private Token<K, V> mark;
+
+	/**
+	 * Create a new grouping command.
+	 * 
+	 * @param inner
+	 *                The inner block.
+	 * 
+	 * @param marker
+	 *                The token to use as the node in the AST.
+	 */
+	public GroupingCommand(ParseBlock<K, V, C> inner, Token<K, V> marker) {
+		innerBlock = inner;
+
+		mark = marker;
+	}
+
+	@Override
+	protected ITree<Token<K, V>> intNullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
+			throws ParserException {
+		ITree<Token<K, V>> opr = innerBlock.parse(ctx);
+
+		return new Tree<>(mark, opr);
+	}
+}
+\ No newline at end of file