Move Pratt Parser to new project

1 files changed, 45 insertions, 0 deletions

diff --git a/JPratt/src/main/java/bjc/utils/parserutils/pratt/commands/DenestingCommand.java b/JPratt/src/main/java/bjc/utils/parserutils/pratt/commands/DenestingCommand.java
new file mode 100644
index 0000000..567e608
--- /dev/null
+++ b/JPratt/src/main/java/bjc/utils/parserutils/pratt/commands/DenestingCommand.java
@@ -0,0 +1,45 @@
+package bjc.utils.parserutils.pratt.commands;
+
+import bjc.utils.data.ITree;
+import bjc.utils.parserutils.ParserException;
+import bjc.utils.parserutils.pratt.InitialCommand;
+import bjc.utils.parserutils.pratt.ParserContext;
+import bjc.utils.parserutils.pratt.Token;
+
+/**
+ * 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 InitialCommand<K, V, C> wrapped;
+
+	/**
+	 * Create a new transforming initial command.
+	 * 
+	 * @param internal
+	 *                The initial command to delegate to.
+	 */
+	public DenestingCommand(InitialCommand<K, V, C> internal) {
+		wrapped = internal;
+	}
+
+	@Override
+	protected ITree<Token<K, V>> intNullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
+			throws ParserException {
+		return wrapped.denote(operator, ctx).getChild(0);
+	}
+}
\ No newline at end of file