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import datetime
from google.appengine.ext import db
from google.appengine.tools import bulkloader
from google.appengine.api import datastore_types
from equations.models import *
dstr = '%m/%d/%Y'
class SymbolLoader(bulkloader.Loader):
def __init__(self):
bulkloader.Loader.__init__(self, 'Symbol',
[('name', str),
('latex', str),
('unicode', str),
])
class SymbolExporter(bulkloader.Exporter):
def __init__(self):
bulkloader.Exporter.__init__(self, 'Symbol',
[('name', str, None),
('latex', str, None),
('unicode', str, None),
])
class VariableLoader(bulkloader.Loader):
def __init__(self):
bulkloader.Loader.__init__(self, 'Variable',
[('name', str),
('latex', str),
('unicode', str),
('description', str),
('symbol', str),
('references', str.split),
('isgeneric', boolean),
])
def HandleEntity(self, entity):
f = Symbol.all().filter("name =", entity['symbol']).get()
entity['symbol'] = f.key()
reflist = []
refstr = eval(entity['references'][0])
for ref in refstr:
r = datastore_types.Link(ref)
reflist.append(r)
entity['references'] = reflist
class VariableExporter(bulkloader.Exporter):
def __init__(self):
bulkloader.Exporter.__init__(self, 'Variable',
[('name', str, None),
('latex', str, None),
('unicode', str, None),
('description', str, None),
('symbol', str, None),
('references', str, None),
('isgeneric', str, None),
])
class EquationLoader(bulkloader.Loader):
def __init__(self):
bulkloader.Loader.__init__(self, 'Equation',
[('name', str),
('latex', str),
('unicode', str),
('description', str),
('created',
lambda x: datetime.datetime.strptime(x, dstr).date()),
('updated',
lambda x: datetime.datetime.strptime(x, dstr).date()),
('variables', str.split),
('references', str.split),
('userurl', datastore_types.Link),
])
def HandleEntity(self, entity):
vlist = []
vstr = eval(entity['variables'][0])
for var in vstr:
v = Variable.all().filter("name =", var).get()
vlist.append(v.key())
entity['variables'] = vlist
reflist = []
refstr = eval(entity['references'][0])
for ref in refstr:
r = datastore_types.Link(ref)
reflist.append(r)
entity['references'] = reflist
class EquationExporter(bulkloader.Exporter):
def __init__(self):
bulkloader.Exporter.__init__(self, 'Equation',
[('name', str, None),
('latex', str, None),
('unicode', str, None),
('description', str, None),
('created', str, None),
('updated', str, None),
('variables', str, None),
('references', str, None),
('userurl', str, None),
])
loaders = [SymbolLoader, VariableLoader, EquationLoader]
exporters= [SymbolExporter, VariableExporter, EquationExporter]
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