From 01cb9f504c860bc1c037a44f3a76bf342a293d46 Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Tue, 22 Mar 2016 12:28:35 -0400
Subject: General formatting cleanup and documentation update

---
 .../java/bjc/utils/dice/ast/DiceASTExpression.java | 142 ++++++++++++++-------
 1 file changed, 95 insertions(+), 47 deletions(-)

(limited to 'BJC-Utils2/src/main/java/bjc/utils/dice/ast/DiceASTExpression.java')

diff --git a/BJC-Utils2/src/main/java/bjc/utils/dice/ast/DiceASTExpression.java b/BJC-Utils2/src/main/java/bjc/utils/dice/ast/DiceASTExpression.java
index 3b81888..aceeed0 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/dice/ast/DiceASTExpression.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/dice/ast/DiceASTExpression.java
@@ -12,48 +12,22 @@ import bjc.utils.dice.CompoundDice;
 import bjc.utils.dice.IDiceExpression;
 import bjc.utils.parserutils.AST;
 
+/**
+ * An implementation of {@link IDiceExpression} backed by an AST of
+ * {@link IDiceASTNode}s
+ * 
+ * @author ben
+ *
+ */
 public class DiceASTExpression implements IDiceExpression {
-	private AST<IDiceASTNode>				ast;
-	private Map<String, DiceASTExpression>	env;
-
-	public DiceASTExpression(AST<IDiceASTNode> ast,
-			Map<String, DiceASTExpression> env) {
-		this.ast = ast;
-		this.env = env;
-	}
-
-	private Pair<Integer, AST<IDiceASTNode>> evalLeaf(IDiceASTNode tokn) {
-		if (tokn instanceof VariableDiceNode) {
-			String varName = ((VariableDiceNode) tokn).getVariable();
-			
-			if (env.containsKey(varName)) {
-				return new Pair<>(env.get(varName).roll(), new AST<>(tokn));
-			} else {
-				// Handle special case for defining variables
-				return new Pair<>(0, new AST<>(tokn));
-			}
-		} else {
-			LiteralDiceNode lnod = (LiteralDiceNode) tokn;
-			String dat = lnod.getData();
-
-			if (StringUtils.countMatches(dat, 'c') == 1
-					&& !dat.equalsIgnoreCase("c")) {
-				String[] strangs = dat.split("c");
-				return new Pair<>(new CompoundDice(strangs).roll(),
-						new AST<>(tokn));
-			} else if (StringUtils.countMatches(dat, 'd') == 1
-					&& !dat.equalsIgnoreCase("d")) {
-				/*
-				 * Handle dice groups
-				 */
-				return new Pair<>(ComplexDice.fromString(dat).roll(),
-						new AST<>(tokn));
-			} else {
-				return new Pair<>(Integer.parseInt(dat), new AST<>(tokn));
-			}
-		}
-	}
 
+	/**
+	 * Build the map of operations to use when collapsing the AST
+	 * 
+	 * @param env
+	 *            The enviroment to evaluate bindings and such against
+	 * @return The operations to use when collapsing the AST
+	 */
 	private static
 			Map<IDiceASTNode, BinaryOperator<Pair<Integer, AST<IDiceASTNode>>>>
 			buildOperations(Map<String, DiceASTExpression> env) {
@@ -121,6 +95,83 @@ public class DiceASTExpression implements IDiceExpression {
 		return opCollapsers;
 	}
 
+	/**
+	 * The AST this expression will evaluate
+	 */
+	private AST<IDiceASTNode>				ast;
+
+	/**
+	 * The enviroment to evaluate bindings and such against
+	 */
+	private Map<String, DiceASTExpression>	env;
+
+	/**
+	 * Create a new dice expression backed by an AST
+	 * 
+	 * @param ast
+	 *            The AST backing this expression
+	 * @param env
+	 *            The enviroment to evaluate bindings against
+	 */
+	public DiceASTExpression(AST<IDiceASTNode> ast,
+			Map<String, DiceASTExpression> env) {
+		this.ast = ast;
+		this.env = env;
+	}
+
+	/**
+	 * Expand a leaf AST token into a pair for evaluation
+	 * 
+	 * @param tokn
+	 *            The token to evaluate
+	 * @return A pair consisting of the token's value and the AST it
+	 *         represents
+	 */
+	private Pair<Integer, AST<IDiceASTNode>> evalLeaf(IDiceASTNode tokn) {
+		if (tokn instanceof VariableDiceNode) {
+			String varName = ((VariableDiceNode) tokn).getVariable();
+
+			if (env.containsKey(varName)) {
+				return new Pair<>(env.get(varName).roll(),
+						new AST<>(tokn));
+			} else {
+				// Handle special case for defining variables
+				return new Pair<>(0, new AST<>(tokn));
+			}
+		} else {
+			LiteralDiceNode lnod = (LiteralDiceNode) tokn;
+			String dat = lnod.getData();
+
+			if (StringUtils.countMatches(dat, 'c') == 1
+					&& !dat.equalsIgnoreCase("c")) {
+				String[] strangs = dat.split("c");
+				return new Pair<>(new CompoundDice(strangs).roll(),
+						new AST<>(tokn));
+			} else if (StringUtils.countMatches(dat, 'd') == 1
+					&& !dat.equalsIgnoreCase("d")) {
+				/*
+				 * Handle dice groups
+				 */
+				return new Pair<>(ComplexDice.fromString(dat).roll(),
+						new AST<>(tokn));
+			} else {
+				return new Pair<>(Integer.parseInt(dat), new AST<>(tokn));
+			}
+		}
+	}
+
+	/**
+	 * Get the AST bound to this expression
+	 * @return the ast
+	 */
+	public AST<IDiceASTNode> getAst() {
+		return ast;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see bjc.utils.dice.IDiceExpression#roll()
+	 */
 	@Override
 	public int roll() {
 		Map<IDiceASTNode, BinaryOperator<Pair<Integer, AST<IDiceASTNode>>>> operations =
@@ -130,15 +181,12 @@ public class DiceASTExpression implements IDiceExpression {
 				(r) -> r.merge((left, right) -> left));
 	}
 
+	/*
+	 * (non-Javadoc)
+	 * @see java.lang.Object#toString()
+	 */
 	@Override
 	public String toString() {
 		return ast.toString();
 	}
-
-	/**
-	 * @return the ast
-	 */
-	public AST<IDiceASTNode> getAst() {
-		return ast;
-	}
 }
-- 
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