Implement Pratt parser.

1 files changed, 25 insertions, 0 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/DefaultNullCommand.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/DefaultNullCommand.java
new file mode 100644
index 0000000..04216f9
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/DefaultNullCommand.java
@@ -0,0 +1,25 @@
+package bjc.utils.parserutils.pratt;
+
+import bjc.utils.data.ITree;
+import bjc.utils.parserutils.ParserException;
+
+/**
+ * Default implementation of null command.
+ * 
+ * @author EVE
+ *
+ * @param <K>
+ *                The key type of the token.
+ * @param <V>
+ *                The value type of the token.
+ * 
+ * @param <C>
+ *                The state type of the parser.
+ */
+public class DefaultNullCommand<K, V, C> extends NullCommand<K, V, C> {
+	@Override
+	public ITree<Token<K, V>> nullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
+			throws ParserException {
+		throw new ParserException("Unexpected token " + operator);
+	}
+}