1 files changed, 84 insertions, 0 deletions
diff --git a/JPratt/src/main/java/bjc/pratt/blocks/ParseBlocks.java b/JPratt/src/main/java/bjc/pratt/blocks/ParseBlocks.java
new file mode 100644
index 0000000..e0dea48
--- /dev/null
+++ b/JPratt/src/main/java/bjc/pratt/blocks/ParseBlocks.java
@@ -0,0 +1,84 @@
+package bjc.pratt.blocks;
+
+import java.util.function.Predicate;
+import java.util.function.UnaryOperator;
+
+import bjc.pratt.ParseBlock;
+import bjc.pratt.Token;
+import bjc.utils.data.ITree;
+
+/**
+ * Utility class for creating common implementations of {@link ParseBlock}
+ * 
+ * @author bjculkin
+ *
+ */
+public class ParseBlocks {
+	/**
+	 * Create a new repeating parse block.
+	 * 
+	 * @param inner
+	 *                The parse block to repeat.
+	 * 
+	 * @param delim
+	 *                The token type that seperates repetitions.
+	 * 
+	 * @param term
+	 *                The token type that terminates repititions.
+	 * 
+	 * @param mark
+	 *                The token to use as the node in the AST.
+	 * 
+	 * @param action
+	 *                The action to perform on the state after every
+	 *                repitition.
+	 * 
+	 * @return A configured repeating parse block.
+	 */
+	public static <K, V, C> ParseBlock<K, V, C> repeating(ParseBlock<K, V, C> inner, K delim, K term,
+			Token<K, V> mark, UnaryOperator<C> action) {
+		return new RepeatingParseBlock<>(inner, delim, term, mark, action);
+	}
+
+	/**
+	 * Create a new triggered parse block.
+	 * 
+	 * @param source
+	 *                The block to trigger around.
+	 * 
+	 * @param onEnter
+	 *                The action to perform upon the state before entering
+	 *                the block.
+	 * 
+	 * @param onExit
+	 *                The action to perform upon the state after exiting the
+	 *                block.
+	 * 
+	 * @return A configured trigger parse block.
+	 */
+	public static <K, V, C> ParseBlock<K, V, C> trigger(ParseBlock<K, V, C> source, UnaryOperator<C> onEnter,
+			UnaryOperator<C> onExit) {
+		return new TriggeredParseBlock<>(onEnter, onExit, source);
+	}
+
+	/**
+	 * Create a new simple parse block.
+	 * 
+	 * @param precedence
+	 *                The precedence of the expression inside the block.
+	 * 
+	 * @param terminator
+	 *                The key type of the token expected after this block,
+	 *                or null if none is expected.
+	 * 
+	 * @param validator
+	 *                The predicate to use to validate parsed expressions,
+	 *                or null if none is used.
+	 * 
+	 * @return A configured simple parse block.
+	 */
+	public static <K, V, C> ParseBlock<K, V, C> simple(int precedence, K terminator,
+			Predicate<ITree<Token<K, V>>> validator) {
+		return new SimpleParseBlock<>(precedence, terminator, validator);
+	}
+}
+\ No newline at end of file