Tweak

1 files changed, 28 insertions, 1 deletions

diff --git a/JPratt/src/main/java/bjc/pratt/commands/impls/InitialCommands.java b/JPratt/src/main/java/bjc/pratt/commands/impls/InitialCommands.java
index bfc4e4f..6af6954 100644
--- a/JPratt/src/main/java/bjc/pratt/commands/impls/InitialCommands.java
+++ b/JPratt/src/main/java/bjc/pratt/commands/impls/InitialCommands.java
@@ -7,9 +7,10 @@ import static bjc.pratt.blocks.ParseBlocks.trigger;
 import java.util.function.UnaryOperator;
 
 import bjc.pratt.blocks.ParseBlock;
-import bjc.pratt.commands.InitialCommand;
+import bjc.pratt.commands.*;
 import bjc.pratt.tokens.Token;
 import bjc.data.Tree;
+import bjc.functypes.MapBuilder;
 
 /**
  * * Contains factory methods for producing common implementations of
@@ -211,4 +212,30 @@ public class InitialCommands {
 	public static <K, V, C> InitialCommand<K, V, C> panfix(final int precedence, final K term, final Token<K, V> marker) {
 		return new PanfixCommand<>(marker, term, precedence);
 	}
+
+	/**
+	 * Create a command that unconditionally returns a failure result.
+	 * 
+	 * @param <K> Token key type
+	 * @param <V> Token value type
+	 * @param <C> Context type
+	 * 
+	 * @return A command that unconditionally fails
+	 */
+	public static <K, V, C> InitialCommand<K, V, C> fail() {
+		return (operator, ctx) -> CommandResult.fail();
+	}
+	
+	/**
+	 * Create a new builder for branching/sub-command style commands.
+	 * 
+	 * @param <K> Token key type
+	 * @param <V> Value key type
+	 * @param <C> Context type
+	 * 
+	 * @return A builder for branching/sub-command style commands
+	 */
+	public static <K, V, C> MapBuilder<K, InitialCommand<K, V, C>, InitialCommand<K, V, C>> branch() {
+		return MapBuilder.from(BranchInitialCommand::new);
+	}
 }
\ No newline at end of file