Source code for plugin_std

# Copyright (c) 2013, System Engineering Software Society
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import collections

from sylib.calculator import plugins
from sylib.calculator.std_plugin import (
    basics, logics, event_detection, plugin_matlab)


class PluginWrapper(object):
    """Merge two or more module-like objects into one.

    getattr calls on PluginWrapper objects are passed on to the module-like
    objects and the first one which doesn't raise AttributeError gets to return
    its result.
    """
    def __init__(self, *namespaces):
        self._namespaces = list(namespaces)

    def __getattr__(self, attr):
        for ns in self._namespaces:
            try:
                return getattr(ns, attr)
            except AttributeError:
                pass

        raise AttributeError(attr)


class StdPlugin(plugins.ICalcPlugin):
    """Standard plugin for calculator node."""

    # This plugin should be listed first:
    WEIGHT = -1

    @staticmethod
    def gui_dict():
        gui_dict = collections.OrderedDict()
        gui_dict.update(basics.GUI_DICT)
        gui_dict.update(logics.GUI_DICT)
        gui_dict.update(event_detection.GUI_DICT)
        return gui_dict

    @staticmethod
    def globals_dict():
        return {'ca': PluginWrapper(basics.LogicOperator,
                                    logics.Logics,
                                    event_detection.EventDetection)}


class MatlabPlugin(plugins.MatlabCalcPlugin):
    """Standard plugin for calculator node."""

    # This plugin should be listed first:
    WEIGHT = -1

    @staticmethod
    def gui_dict():
        gui_dict = collections.OrderedDict()
        gui_dict.update(plugin_matlab.GUI_DICT)

        return gui_dict

    @staticmethod
    def globals_dict():
        return {'ca': PluginWrapper(plugin_matlab.GUI_DICT)}