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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 = ((item[0], id, item[2]),) + 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 ("Item", "0", ())
+ elif id == cart[0][1]:
+ return cart[0]
+ else:
+ return find(id, cart[1:])
+
+# Get items from the cart
+def get(id, cache, host, email):
+ if id == ():
+ return ("Your Cart", 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[2])[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))
+