1 files changed, 77 insertions, 0 deletions
diff --git a/dice-lang/src/main/java/bjc/dicelang/BindingDiceExpression.java b/dice-lang/src/main/java/bjc/dicelang/BindingDiceExpression.java
new file mode 100644
index 0000000..94dd761
--- /dev/null
+++ b/dice-lang/src/main/java/bjc/dicelang/BindingDiceExpression.java
@@ -0,0 +1,77 @@
+package bjc.dicelang;
+
+import java.util.Map;
+
+/**
+ * A variable expression that represents binding a variable to a name in an
+ * enviroment
+ * 
+ * @author ben
+ *
+ */
+public class BindingDiceExpression implements IDiceExpression {
+	/**
+	 * The expression being bound to a name
+	 */
+	private IDiceExpression	exp;
+
+	/**
+	 * The name to bind the expression to
+	 */
+	private String			name;
+
+	/**
+	 * Create a new dice expression binder from two expressions and an
+	 * enviroment
+	 * 
+	 * @param left
+	 *            The left side expression to get a name from. Must be a
+	 *            ReferenceDiceExpression
+	 * @param right
+	 *            The right side to bind to the name
+	 * @param env
+	 *            The enviroment to bind into
+	 */
+	public BindingDiceExpression(IDiceExpression left,
+			IDiceExpression right, Map<String, IDiceExpression> env) {
+		this(((ReferenceDiceExpression) left).getName(), right, env);
+	}
+
+	/**
+	 * Create a new dice expression binder
+	 * 
+	 * @param name
+	 *            The name of the variable to bind
+	 * @param exp
+	 *            The expression to bind to the variable
+	 * @param env
+	 *            The enviroment to bind it in
+	 */
+	public BindingDiceExpression(String name, IDiceExpression exp,
+			Map<String, IDiceExpression> env) {
+		this.name = name;
+		this.exp = exp;
+
+		env.put(name, exp);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see bjc.utils.dice.IDiceExpression#roll()
+	 */
+	@Override
+	public int roll() {
+		return exp.roll();
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see java.lang.Object#toString()
+	 */
+	@Override
+	public String toString() {
+		return "assign[n=" + name + ", exp=" + exp.toString() + "]";
+	}
+}