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# This file contains functions and classes necessary for the operation of backends.
class Food :
def __init__(self,name, price="", category="Essen", veggie=False, desc=None, ingredients={}) :
self.name = name
self.price = price
self.category = category
self.veggie = veggie
self.desc=desc
self.ingredients=ingredients
class NoMenuError(Exception) :
""" gets raised if there's no menu"""
class Renderer(object) :
def __init__(self, name, human_name, module, description="", optional_args=[]) :
self.name = name
self.human_name = human_name
self.description = description
self.optional_args = []
self.module = module
def render(self, foods, **options) :
self.module.render(foods, **options)
def formt (food) :
cat = []
vegkeys = [ "", "Vegetarian", "Vegan" ]
r = ""
food.sort(key=lambda foo: foo.category)
for i in food:
if not i.category in cat :
cat.append(i.category)
if not i.category == None :
r=r+ i.category+"\n"
r=r+"\t" + i.name.ljust(80) + "\t"+ i.price.ljust(20) + vegkeys[i.veggie]+"\n"
if i.desc :
r = r+"\t "+i.desc+"\n"
return r
from math import acos, radians, pi, cos, sin
def dist(pos1, pos2) :
# gives a rough estimate of the distance Accuracy: +/- cos(angle
# between coordinates)*37/2pi. (about +/- 50 m for distances).
# Distance is returned in km
if pos1 is None or pos2 is None :
return float("Inf")
lat1, long1 = pos1
lat2, long2 = pos2
a = radians(90 - lat1);
b = radians(90 - lat2);
C = radians(abs(long1-long2));
return acos(cos(a)*cos(b)+sin(a)*sin(b)*cos(C))*40040/(2*pi);
foodsources = {}
renderers = {}
class Restaurant(object):
def __init__(self, name, human_name, module, optional_args=[], obligatory_args=(), pos=None):
self.name = name
self.human_name = human_name
self.module = module
self.optional_args = optional_args
self.obligatory_args = obligatory_args
self.pos = pos
def get_food(self,**opt_args) :
return self.module.get_food_items(*self.obligatory_args, **opt_args)
def register_restaurant(restaurant):
global foodsources
foodsources[restaurant.name] = restaurant
def register_renderer(renderer) :
global renderers
renderers[renderer.name] = renderer
def only_student_prices(price):
return price.split("/")[0]
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