Update Pratt parser

1 files changed, 25 insertions, 4 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/BinaryPostCommand.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/BinaryPostCommand.java
index 7aaf735..806f2f3 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/BinaryPostCommand.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/BinaryPostCommand.java
@@ -2,14 +2,35 @@ package bjc.utils.parserutils.pratt.commands;
 
 import bjc.utils.parserutils.pratt.NonInitialCommand;
 
-/*
- * A command with constant binding power.
+/**
+ * A operator with fixed precedence.
+ * 
+ * @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 abstract class BinaryPostCommand<K, V, C> extends NonInitialCommand<K, V, C> {
 	private final int leftPower;
 
-	public BinaryPostCommand(int power) {
-		leftPower = power;
+	/**
+	 * Create a new operator with fixed precedence.
+	 * 
+	 * @param precedence
+	 *                The precedence of the operator.
+	 */
+	public BinaryPostCommand(int precedence) {
+		if (precedence < 0) {
+			throw new IllegalArgumentException("Precedence must be non-negative");
+		}
+
+		leftPower = precedence;
 	}
 
 	@Override