Pacakge reorganization

1 files changed, 93 insertions, 0 deletions

diff --git a/dice-lang/src/bjc/dicelang/v1/BindingDiceExpression.java b/dice-lang/src/bjc/dicelang/v1/BindingDiceExpression.java
new file mode 100644
index 0000000..019f5ee
--- /dev/null
+++ b/dice-lang/src/bjc/dicelang/v1/BindingDiceExpression.java
@@ -0,0 +1,93 @@
+package bjc.dicelang.v1;
+
+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	expression;
+
+	/*
+	 * 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 enviroment
+	 *            The enviroment to bind into
+	 */
+	public BindingDiceExpression(IDiceExpression left,
+			IDiceExpression right,
+			Map<String, IDiceExpression> enviroment) {
+		if (!(left instanceof ReferenceDiceExpression)) {
+			throw new UnsupportedOperationException(
+					"Error: Binding an expression to something that is not a variable reference,"
+					+ " or array thereof. is unsupported."
+					+ " Problematic expression is " + left);
+		}
+
+		String varName = ((ReferenceDiceExpression) left).getName();
+
+		initialize(varName, right, enviroment);
+	}
+
+	/**
+	 * Create a new dice expression binder
+	 * 
+	 * @param name
+	 *            The name of the variable to bind
+	 * @param expression
+	 *            The expression to bind to the variable
+	 * @param enviroment
+	 *            The enviroment to bind it in
+	 */
+	public BindingDiceExpression(String name, IDiceExpression expression,
+			Map<String, IDiceExpression> enviroment) {
+		initialize(name, expression, enviroment);
+	}
+
+	private void initialize(String name, IDiceExpression expr,
+			Map<String, IDiceExpression> enviroment) {
+		this.name = name;
+		this.expression = expr;
+
+		enviroment.put(name, expr);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see bjc.utils.dice.IDiceExpression#roll()
+	 */
+	@Override
+	public int roll() {
+		return expression.roll();
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see java.lang.Object#toString()
+	 */
+	@Override
+	public String toString() {
+		return "assign[n=" + name + ", exp="
+			+ expression.toString() + "]";
+	}
+}