1 files changed, 30 insertions, 0 deletions
diff --git a/plotter/view/puzzletree/nodes/binaryoperator.py b/plotter/view/puzzletree/nodes/binaryoperator.py
new file mode 100755
index 0000000..97208e5
--- /dev/null
+++ b/plotter/view/puzzletree/nodes/binaryoperator.py
@@ -0,0 +1,30 @@
+from .node import Node as _Node
+
+
+class BinaryOperator(_Node):
+    """BinaryOperators have at most two children."""
+
+    def __init__(self, leftchild=None, rightchild=None):
+        """Create binary operator (possibly with children)."""
+        _Node.__init__(self)
+        self.children = [leftchild, rightchild]
+
+
+    @classmethod
+    def load(nodeclass, settings):
+        """Creates a new BinaryOperator of type nodeclass.
+
+        Default BinaryOperators don't have any parameters,
+        so this just returns a new node.
+        """
+        return nodeclass()
+
+
+    def get_equation_string(self, variable):
+        """Returns a string representing the current equation."""
+
+        return "(%s %s %s)" % (
+            _Node.get_equation_string(self.children[0], variable),
+            self.operatorstring,
+            _Node.get_equation_string(self.children[1], variable))
+