1 files changed, 55 insertions, 0 deletions
diff --git a/JPratt/src/main/java/com/ashardalon/pratt/commands/impls/GroupingCommand.java b/JPratt/src/main/java/com/ashardalon/pratt/commands/impls/GroupingCommand.java
new file mode 100644
index 0000000..284c1e9
--- /dev/null
+++ b/JPratt/src/main/java/com/ashardalon/pratt/commands/impls/GroupingCommand.java
@@ -0,0 +1,55 @@
+package com.ashardalon.pratt.commands.impls;
+
+import bjc.data.Tree;
+
+import com.ashardalon.pratt.ParserContext;
+import com.ashardalon.pratt.blocks.ParseBlock;
+import com.ashardalon.pratt.commands.AbstractInitialCommand;
+import com.ashardalon.pratt.commands.CommandResult;
+import com.ashardalon.pratt.tokens.Token;
+
+import bjc.data.SimpleTree;
+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 final ParseBlock<K, V, C> innerBlock;
+
+	private final 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(final ParseBlock<K, V, C> inner, final Token<K, V> marker) {
+		innerBlock = inner;
+
+		mark = marker;
+	}
+
+	@Override
+	protected CommandResult<K, V> intNullDenotation(final Token<K, V> operator, final ParserContext<K, V, C> ctx)
+			throws ParserException {
+		final CommandResult<K,V> resOpr = innerBlock.parse(ctx);
+		Tree<Token<K, V>> opr = resOpr.success();
+		return CommandResult.success(new SimpleTree<>(mark, opr));
+	}
+}
+\ No newline at end of file