Merge branch 'master' of https://github.com/bculkin2442/JPratt.git

1 files changed, 52 insertions, 0 deletions

diff --git a/JPratt/src/main/java/bjc/pratt/commands/impls/GroupingCommand.java b/JPratt/src/main/java/bjc/pratt/commands/impls/GroupingCommand.java
new file mode 100644
index 0000000..28f1299
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+++ b/JPratt/src/main/java/bjc/pratt/commands/impls/GroupingCommand.java
@@ -0,0 +1,52 @@
+package bjc.pratt.commands.impls;
+
+import bjc.pratt.ParserContext;
+import bjc.pratt.blocks.ParseBlock;
+import bjc.pratt.commands.AbstractInitialCommand;
+import bjc.pratt.tokens.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 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 ITree<Token<K, V>> intNullDenotation(final Token<K, V> operator, final ParserContext<K, V, C> ctx)
+			throws ParserException {
+		final ITree<Token<K, V>> opr = innerBlock.parse(ctx);
+
+		return new Tree<>(mark, opr);
+	}
+}
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