started implementing interpreter pattern.

pypatterns/behavioral/interpreter.py

@@ -0,0 +1,59 @@
+from abc import ABCMeta, abstractmethod
+
+
+class Context(object):
+    """
+    Context class as part of the Interpreter design pattern.
+    """
+    def __init__(self, in_data):
+        self.in_data = in_data
+        self.out_data = None
+
+
+class Expression(object, metaclass=ABCMeta):
+    """
+    Abstract Expression class as part of the Interpreter design pattern.
+    """
+    @abstractmethod
+    def interpret(self, context):
+        """
+        Abstract interpret method.
+
+        @param context: The context to interpret.
+        @type context: Context
+        """
+        pass
+
+
+class NonTerminalExpression(Expression, metaclass=ABCMeta):
+    """
+    Base class for the NonTerminalExpression class as part of the Interpreter design pattern.
+    """
+    def __init__(self, **expressions):
+        """
+        Initialize a new NonTerminalExpression instance.
+
+        @param expressions: A dict of Expressions that are used in this NonTerminalExpressions production.
+        @type expressions: dict
+        """
+        self.expressions = expressions
+
+
+class TerminalExpression(Expression, metaclass=ABCMeta):
+    """
+    Base class for the TerminalExpression class as part of the Interpreter design pattern.
+    """
+    def __init__(self, literal):
+        """
+        Initialize a new TerminalExpression instance.
+
+        @param literal: A literal representing this TerminalExpression.
+        """
+        self.literal = literal
+
+
+
+
+
+
+