From 79d3a4a47cbc1fcf17c77c6fc12ff826a3077bac Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Wed, 6 Apr 2016 13:50:00 -0400
Subject: Minor bugfixes/changes, as well as beginnings of CLI systems

---
 .../src/main/java/bjc/utils/parserutils/AST.java   | 157 +++++++++++----------
 1 file changed, 81 insertions(+), 76 deletions(-)

(limited to 'BJC-Utils2/src/main/java/bjc/utils/parserutils')

diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/AST.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/AST.java
index 4b00b63..90961d5 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/parserutils/AST.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/AST.java
@@ -67,6 +67,57 @@ public class AST<T> {
 		right = rght;
 	}
 
+	/**
+	 * Apply an action to the head node of this AST
+	 * 
+	 * @param <E>
+	 *            The type of the returned value
+	 * @param headAction
+	 *            The action to apply to the head node
+	 * @return The result of applying the action
+	 */
+	public <E> E applyToHead(Function<T, E> headAction) {
+		if (headAction == null) {
+			throw new NullPointerException("Action must not be null");
+		}
+
+		return headAction.apply(token);
+	}
+
+	/**
+	 * Apply an action to the left side of this AST
+	 * 
+	 * @param <E>
+	 *            The type of the returned value
+	 * @param leftAction
+	 *            The action to apply to the left side
+	 * @return The result of applying the action
+	 */
+	public <E> E applyToLeft(Function<AST<T>, E> leftAction) {
+		if (leftAction == null) {
+			throw new NullPointerException("Action must not be null");
+		}
+
+		return leftAction.apply(left);
+	}
+
+	/**
+	 * Apply an action to the right side of this AST
+	 * 
+	 * @param <E>
+	 *            The type of the returned value
+	 * @param rightAction
+	 *            The action to apply to the right side
+	 * @return The result of applying the action
+	 */
+	public <E> E applyToRight(Function<AST<T>, E> rightAction) {
+		if (rightAction == null) {
+			throw new NullPointerException("Action must not be null");
+		}
+
+		return rightAction.apply(right);
+	}
+
 	/**
 	 * Collapse this tree into a single node
 	 * 
@@ -97,12 +148,36 @@ public class AST<T> {
 		if (resultTransformer != null) {
 			return resultTransformer.apply(
 					internalCollapse(tokenTransformer, nodeTransformer));
+		}
+
+		// This is valid because if the user passes null as the last
+		// parameter, E will be inferred as Object, but will actually
+		// be T2
+		return (E) internalCollapse(tokenTransformer, nodeTransformer);
+	}
+
+	private <T2> T2 collapseBranches(Function<T, T2> tokenTransformer,
+			Function<T, BinaryOperator<T2>> nodeTransformer) {
+		T2 leftCollapsed;
+
+		if (left == null) {
+			leftCollapsed = null;
 		} else {
-			// This is valid because if the user passes null as the last
-			// parameter, E will be inferred as Object, but will actually
-			// be T2
-			return (E) internalCollapse(tokenTransformer, nodeTransformer);
+			leftCollapsed = left.internalCollapse(tokenTransformer,
+					nodeTransformer);
 		}
+
+		T2 rightCollapsed;
+
+		if (right == null) {
+			rightCollapsed = null;
+		} else {
+			rightCollapsed = right.internalCollapse(tokenTransformer,
+					nodeTransformer);
+		}
+
+		return nodeTransformer.apply(token).apply(leftCollapsed,
+				rightCollapsed);
 	}
 
 	/**
@@ -129,28 +204,9 @@ public class AST<T> {
 			Function<T, BinaryOperator<T2>> nodeTransformer) {
 		if (left == null && right == null) {
 			return tokenTransformer.apply(token);
-		} else {
-			T2 leftCollapsed;
-
-			if (left == null) {
-				leftCollapsed = null;
-			} else {
-				leftCollapsed = left.internalCollapse(tokenTransformer,
-						nodeTransformer);
-			}
-
-			T2 rightCollapsed;
-
-			if (right == null) {
-				rightCollapsed = null;
-			} else {
-				rightCollapsed = right.internalCollapse(tokenTransformer,
-						nodeTransformer);
-			}
-
-			return nodeTransformer.apply(token).apply(leftCollapsed,
-					rightCollapsed);
 		}
+
+		return collapseBranches(tokenTransformer, nodeTransformer);
 	}
 
 	/**
@@ -302,55 +358,4 @@ public class AST<T> {
 			action.accept(token);
 		}
 	}
-
-	/**
-	 * Apply an action to the head node of this AST
-	 * 
-	 * @param <E>
-	 *            The type of the returned value
-	 * @param headAction
-	 *            The action to apply to the head node
-	 * @return The result of applying the action
-	 */
-	public <E> E applyToHead(Function<T, E> headAction) {
-		if (headAction == null) {
-			throw new NullPointerException("Action must not be null");
-		}
-
-		return headAction.apply(token);
-	}
-
-	/**
-	 * Apply an action to the left side of this AST
-	 * 
-	 * @param <E>
-	 *            The type of the returned value
-	 * @param leftAction
-	 *            The action to apply to the left side
-	 * @return The result of applying the action
-	 */
-	public <E> E applyToLeft(Function<AST<T>, E> leftAction) {
-		if (leftAction == null) {
-			throw new NullPointerException("Action must not be null");
-		}
-
-		return leftAction.apply(left);
-	}
-
-	/**
-	 * Apply an action to the right side of this AST
-	 * 
-	 * @param <E>
-	 *            The type of the returned value
-	 * @param rightAction
-	 *            The action to apply to the right side
-	 * @return The result of applying the action
-	 */
-	public <E> E applyToRight(Function<AST<T>, E> rightAction) {
-		if (rightAction == null) {
-			throw new NullPointerException("Action must not be null");
-		}
-
-		return rightAction.apply(right);
-	}
 }
-- 
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