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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# Shopping cart implementation
import uuid
import sys
# Convert a particular host and user email to a cart id
def cartid(host, email):
return ("cart", host.eval(), email.eval())
# Get the shopping cart from the cache
# Return an empty cart if not found
def getcart(id, cache):
cart = cache.get(id)
if cart is None:
return ()
return cart
# Post a new item to the cart, create a new cart if necessary
def post(collection, item, cache, host, email):
id = str(uuid.uuid1())
cart = (("'entry", item[0][1], ("'id", id), item[0][3]),) + getcart(cartid(host, email), cache)
cache.put(cartid(host, email), cart)
return (id,)
# Find an item in the cart
def find(id, cart):
if cart == ():
return (("'entry", ("'title", "Item"), ("'id", 0)),)
elif id == cart[0][2][1]:
return (cart[0],)
else:
return find(id, cart[1:])
# Get items from the cart
def get(id, cache, host, email):
if id == ():
return ((("'feed", ("'title", "Your Cart"), ("'id", email.eval())) + getcart(cartid(host,email), cache)),)
return find(id[0], getcart(cartid(host, email), cache))
# Delete items from the cart
def delete(id, cache, host, email):
if id == ():
return cache.delete(cartid(host, email))
return True
# Return the price of an item
def price(item):
return float(filter(lambda x: x[0] == "'price", item[3][1][1:])[0][1])
# Sum the prices of a list of items
def sum(items):
if items == ():
return 0
return price(items[0]) + sum(items[1:])
# Return the total price of the items in the cart
def total(cache, host, email):
return sum(getcart(cartid(host, email), cache))
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