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# -*- coding: utf-8 -*-
from functions import contain, collect_digits, make_line, make_input
from functions import make_line_remainder, make_input_remainder
class Exercise:
"""This is the base class for the individual exercises.
An exercise is characterized by a topic. A topic determines the
fields of the settings self._sett and public methods of Exercise.
The values of self._sett may vary from exercise to exercise.
"""
def __init__(self):
""" An Exercise has a title, i.e. short textual description,
set by the author for display in the Collection. """
self._title = None
""" An Exercise has a detailed textual description
set by the author. """
self._description = None
""" An Exercise is characterized by an icon set by the author. """
self._icon = None
""" An Exercise stores data on evaluation, i.e. on how often the
Exercise has been done, what errors have been made TODO """
self._eval = None
""" The settings determine the generation of calculations.
The fields of the settings are determined by self._sett['topic'];
the values of the settings are different for different Exercises.
self._sett['calclines'] determines the # of lines in a calculation."""
self._sett = None
""" Calculations are generated according to the settings. """
self._calcs = None
""" An Exercise needs the Display for updating the settings"""
self._display = None
def get_topic(self):
"""The topic is preliminarily used to identify an exercise."""
return (self._sett)['topic']
def get_setting(self):
return self._sett
def update_setting(self, sett):
""" Update the settings and generate calculations accordingly. """
self._sett = sett
self._calcs = self._generate_calcs()
def get_calcs(self):
""" Get all calculations generated by the current settings. """
return self._calcs
def get_next_calc(self):
""" Get the next calculation from the Exercise.
TODO.WN091123: handle exception after last exercise. """
return (self._calcs).pop()
def count(self):
""" Return the number of calculations generated by
the current settings """
return len(self._calcs)
def format_addsub_simp(self, (calc, linepos)):
""" Prepare the representation of a calculation for Display
on 1 line. Used within several subclasses. """
#@print('in Display.format_addsub_simp: calc=', (calc, linepos))#@
_ccs = collect_digits(calc)
#print('in Exercise.format_addsub_simp: _ccs=',_ccs )
_l0 = make_line(_ccs, linepos)
_ip = make_input(_ccs, linepos)
#@print('in Display.format_addsub_simp: return=', ([_l0], _ip)) #@
return ([_l0], _ip)
#return ([[' ', '1', '0', ' ', '-', ' ', '7', ' ', '=', ' ', '_', ' ']], [(0, 10, '3', ' 10 - 7 = _ ', ' 10 - 7 = 3 ', [' ', '1', '0', ' ', '-', ' ', '7', ' ', '=', ' ', '3', ' '])])
#===== methods of subclasses different for topic-specific settings
def format(self, calc):
""" Prepare the representation of a calculation for Display.
This method is public for eventual use on calculations
coming through the net (TODO cooperative games, etc)"""
pass
def _generate_calcs(self):
""" Generate calculations according to topic-specific settings.
Called on each call of update_setting"""
pass
def define_buttons(self):
""" Define buttons for update settings. """
pass
def set_buttons(self, sett):
""" Display buttons according to the current setting. """
pass
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