Begin Implementation of Binary Operator Support

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>

Sources/P4Runtime/Expressions.swift

@@ -86,3 +86,30 @@ extension TypedIdentifier: EvaluatableExpression {
     return execution.scopes.lookup(identifier: self)
   }
 }
+
+public func binary_equal_operator_evaluator(left: P4Value, right: P4Value) -> P4Value {
+  if left.eq(rhs: right) {
+    return P4BooleanValue(withValue: true)
+  }
+  return P4BooleanValue(withValue: false)
+}
+
+extension BinaryOperatorExpression: EvaluatableExpression {
+    public func evaluate(execution: Common.ProgramExecution) -> Common.Result<any Common.P4Value> {
+        let maybe_evaluated_left = self.left.evaluate(execution: execution)
+        guard case Result.Ok(let evaluated_left) = maybe_evaluated_left else {
+          return maybe_evaluated_left
+        }
+
+        let maybe_evaluated_right = self.right.evaluate(execution: execution)
+        guard case Result.Ok(let evaluated_right) = maybe_evaluated_right else {
+          return maybe_evaluated_right
+        }
+
+        return Result.Ok(self.evaluator.2(evaluated_left, evaluated_right))
+    }
+
+    public func type() -> any Common.P4Type {
+        return self.evaluator.1 
+    }
+}