From e7413128ff4e376997de6e94e4bea5eca14811ef Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Thu, 27 Oct 2016 21:56:18 -0400
Subject: Moved examples

---
 .../dicelang/examples/DiceExpressionPreparer.java  | 93 ++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 dice-lang/src/bjc/dicelang/examples/DiceExpressionPreparer.java

(limited to 'dice-lang/src/bjc/dicelang/examples/DiceExpressionPreparer.java')

diff --git a/dice-lang/src/bjc/dicelang/examples/DiceExpressionPreparer.java b/dice-lang/src/bjc/dicelang/examples/DiceExpressionPreparer.java
new file mode 100644
index 0000000..5488b5d
--- /dev/null
+++ b/dice-lang/src/bjc/dicelang/examples/DiceExpressionPreparer.java
@@ -0,0 +1,93 @@
+package bjc.dicelang.examples;
+
+import java.util.Deque;
+import java.util.LinkedList;
+
+import bjc.utils.data.IPair;
+import bjc.utils.data.Pair;
+import bjc.utils.funcdata.FunctionalStringTokenizer;
+import bjc.utils.funcdata.IList;
+import bjc.utils.funcutils.ListUtils;
+import bjc.utils.parserutils.ShuntingYard;
+
+/**
+ * Prepare a dice expression to be parsed
+ * 
+ * @author ben
+ *
+ */
+public class DiceExpressionPreparer {
+	/**
+	 * The yard to use for shunting expressions
+	 */
+	private static ShuntingYard<String>	yard;
+
+	private static final int			MATH_PREC	= 20;
+	private static final int			DICE_PREC	= 10;
+	private static final int			EXPR_PREC	= 0;
+
+	// Do initialization for all parsers
+	static {
+		// The shunter we're going to use
+		yard = new ShuntingYard<>(false);
+
+		// Configure the shunters operators
+		// Basic mathematical operators
+		yard.addOp("+", 0 + MATH_PREC);
+		yard.addOp("-", 0 + MATH_PREC);
+
+		yard.addOp("*", 1 + MATH_PREC);
+		yard.addOp("/", 1 + MATH_PREC);
+
+		yard.addOp("d", 0 + DICE_PREC); // dice operator: use for creating
+		// variable size dice groups
+		yard.addOp("c", 1 + DICE_PREC); // compound operator: use for
+		// creating compound dice from expressions
+
+		yard.addOp("=>", 0 + EXPR_PREC); // let operator: evaluate an
+		// expression in the context of another
+		yard.addOp(":=", 1 + EXPR_PREC); // binding operator: Bind a name
+		// to a variable expression
+	}
+
+	// Prepare a command, turning raw tokens into input for the tree builder
+	public static IList<String> prepareCommand(String currentLine) {
+			// Split the command into tokens
+		IList<String> tokens = FunctionalStringTokenizer
+				.fromString(currentLine).toList();
+
+		// The linked list to use for handling tokens
+		Deque<IPair<String, String>> ops = new LinkedList<>();
+
+		// Prepare the list for operator expansion
+		ops.add(new Pair<>("+", "\\+"));
+		ops.add(new Pair<>("-", "-"));
+		ops.add(new Pair<>("*", "\\*"));
+		ops.add(new Pair<>("/", "/"));
+		ops.add(new Pair<>(":=", ":="));
+		ops.add(new Pair<>("=>", "=>"));
+
+		// Expand infix single tokens to multiple infix tokens
+		IList<String> semiExpandedTokens = ListUtils.splitTokens(tokens,
+				ops);
+
+		// Reinitialize the list
+		ops = new LinkedList<>();
+
+		// Prepare the list for deaffixation
+		ops.add(new Pair<>("(", "\\("));
+		ops.add(new Pair<>(")", "\\)"));
+		ops.add(new Pair<>("[", "\\["));
+		ops.add(new Pair<>("]", "\\]"));
+
+		// Deaffix ('s and ['s from tokens
+		IList<String> fullyExpandedTokens = ListUtils
+				.deAffixTokens(semiExpandedTokens, ops);
+
+		// Remove blank tokens
+		fullyExpandedTokens.removeIf((strang) -> strang.equals(""));
+
+		// Shunt the tokens, and hand them back
+		return yard.postfix(fullyExpandedTokens, (token) -> token);
+	}
+}
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