1 files changed, 50 insertions, 0 deletions
diff --git a/JPratt/src/main/java/com/ashardalon/pratt/commands/impls/DenestingCommand.java b/JPratt/src/main/java/com/ashardalon/pratt/commands/impls/DenestingCommand.java
new file mode 100644
index 0000000..438101e
--- /dev/null
+++ b/JPratt/src/main/java/com/ashardalon/pratt/commands/impls/DenestingCommand.java
@@ -0,0 +1,50 @@
+package com.ashardalon.pratt.commands.impls;
+
+import com.ashardalon.pratt.ParserContext;
+import com.ashardalon.pratt.commands.AbstractInitialCommand;
+import com.ashardalon.pratt.commands.CommandResult;
+import com.ashardalon.pratt.commands.InitialCommand;
+import com.ashardalon.pratt.commands.CommandResult.Status;
+import com.ashardalon.pratt.tokens.Token;
+
+import bjc.utils.parserutils.ParserException;
+
+/**
+ * A command that denests a input tree.
+ *
+ * Useful for processing the result of passing a complex parse group to a
+ * command.
+ *
+ * @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 DenestingCommand<K, V, C> extends AbstractInitialCommand<K, V, C> {
+	private final InitialCommand<K, V, C> wrapped;
+
+	/**
+	 * Create a new transforming initial command.
+	 *
+	 * @param internal
+	 *        The initial command to delegate to.
+	 */
+	public DenestingCommand(final InitialCommand<K, V, C> internal) {
+		wrapped = internal;
+	}
+
+	@Override
+	protected CommandResult<K, V> intNullDenotation(final Token<K, V> operator, final ParserContext<K, V, C> ctx)
+			throws ParserException {
+		CommandResult<K, V> res = wrapped.denote(operator, ctx);
+		if (res.status != Status.SUCCESS) return res;
+		return CommandResult.success(res.success().getChild(0));
+	}
+}
+\ No newline at end of file