PyNesca/core/communication/ConvertTable.py

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class ConvertTable():
'''The class is used to store and find the right function to convert value from
one key to another'''
def __init__(self):
self.convert_functions = []
def add_function(self, function):
'''Here you can add function to ConvertTable.'''
#TODO: make this method produce new functions, that will be able to
#create converter chains
self.convert_functions.append(function)
def all_possible_conversions(self, from_keys):
result = set()
from_keys = set(from_keys)
for function in self.convert_functions:
input_args = set(value for key, value in
function.__annotations__.items() if
key!='return')
if input_args.issubset(from_keys):
result = result.union(set(function.__annotations__['return']))
return result
def get_converter(self, from_keys, to_key):
'''This function returns converter function, that can convert one key
to another'''
to_key = {to_key}
for function in self.convert_functions:
input_args = set(value for key, value in
function.__annotations__.items() if
key!='return')
if input_args.issubset(from_keys) and to_key.issubset(function.__annotations__['return']):
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print("found converter for %s!!!" % to_key)
return input_args, function
raise Exception("There is no converter for %s to %s" % (from_keys,
to_key))
return None, None
def get_metaconverter(self, from_keys, to_keys):
'''This function constructs and returns new function used to provide fast
conversion from from_keys to to_keys'''
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print("from_keys",from_keys)
print("to_keys",to_keys)
converters_args = []
converters = []
for key in to_keys:
keys_to_convert, converter = None, None
if key in from_keys:
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print("%s is in from_keys" % key)
keys_to_convert = [key]
converter = lambda x : {key: x}
else:
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print("getting converter for %s." % key)
keys_to_convert, converter = self.get_converter(from_keys, key)
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print("needed keys: %s" % " ".join(keys_to_convert))
converters_args.append(keys_to_convert)
converters.append(converter)
def metaconverter(args_dict):
if args_dict == None:
return [None] * len(converters)
res = []
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print(converters)
print(converters_args)
for i,conv in enumerate(converters):
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print(converters_args[i])
print(args_dict)
args = [args_dict[arg] for arg in converters_args[i]]
res.append(*[value for key, value in conv(*args).items()])
return res
return metaconverter