Added cdp parser.

Author: zshaheen

cdp/cdp_parser.py

@@ -0,0 +1,49 @@
+import argparse
+import abc
+
+
+class CDPParser(argparse.ArgumentParser):
+    __metaclass__ = abc.ABCMeta
+
+    def __init__(self, parameter_cls, *args, **kwargs):
+        # conflict_handler='resolve' lets new args override older ones
+        super(CDPParser, self).__init__(conflict_handler='resolve',
+                                        *args, **kwargs)
+        self.load_default_args()
+        self.parameter = parameter_cls()
+        self.args_namespace = None∂
+
+    def get_parameter(self):
+        """ Returns the parameter created by
+        the command line inputs """
+
+        if self.args_namespace is None:
+            self.args_namespace = self.parse_args()
+        print self.args_namespace
+
+        if self.args_namespace.parameter is not None:
+            self.parameter.load_parameter_from_py(self.args_namespace.parameter)
+
+        # Overwrite the values of the parameter with the user's args
+        for arg_name, arg_value in vars(self.args_namespace).iteritems():
+            if arg_value is not None:
+                # Add it to the parameter
+                setattr(self.parameter, arg_name, arg_value)
+
+        self.parameter.check_values()
+        return self.parameter
+
+    def load_default_args(self):
+        """ Load the default arguments for
+        the parser. """
+        self.add_argument(
+            '-p', '--parameters',
+            type=str,
+            dest='parameter',
+            help='Path to the user-defined parameter file',
+            required=False)
+
+    def add_args_and_values(self, arg_list):
+        """ Used for testing. Can test args input as if they
+        were inputted from the command line. """
+        self.args_namespace = self.parse_args(arg_list)