Update Pratt parser

1 files changed, 26 insertions, 2 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/UnaryCommand.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/UnaryCommand.java
index 9a79d21..c608362 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/UnaryCommand.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/UnaryCommand.java
@@ -6,11 +6,35 @@ import bjc.utils.parserutils.ParserException;
 import bjc.utils.parserutils.pratt.ParserContext;
 import bjc.utils.parserutils.pratt.Token;
 
+/**
+ * A unary 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 UnaryCommand<K, V, C> extends AbstractInitialCommand<K, V, C> {
 	private final int nullPwer;
 
-	public UnaryCommand(int nullPower) {
-		nullPwer = nullPower;
+	/**
+	 * Create a new unary command.
+	 * 
+	 * @param precedence
+	 *                The precedence of this operator.
+	 */
+	public UnaryCommand(int precedence) {
+		if(precedence < 0) {
+			throw new IllegalArgumentException("Precedence must be non-negative");
+		}
+		
+		nullPwer = precedence;
 	}
 
 	@Override