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58 lines
2.1 KiB
Python
58 lines
2.1 KiB
Python
import itertools
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class Parameters:
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def __init__( self, mandatoryParameters, optionalParameters ):
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self.__mandatoryParameters = mandatoryParameters
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self.__optionalParameters = optionalParameters
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def check( self, args, kwds ):
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data = dict( kwds )
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for arg, argumentName in itertools.izip( args, itertools.chain( self.__mandatoryParameters, self.__optionalParameters ) ):
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if argumentName in kwds:
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raise TypeError()
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else:
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data[ argumentName ] = arg
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for argumentName in data:
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if argumentName not in itertools.chain( self.__mandatoryParameters, self.__optionalParameters ):
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raise TypeError()
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for argumentName in self.__mandatoryParameters:
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if argumentName not in data:
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raise TypeError()
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return data
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def documentParameters( self ):
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mandatory = ", ".join( self.__mandatoryParameters )
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optional = "[" + ", ".join( self.__optionalParameters ) + "]"
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if len( self.__mandatoryParameters ) == 0:
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if len( self.__optionalParameters ) == 0:
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return ""
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else:
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return " " + optional + " "
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else:
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if len( self.__optionalParameters ) == 0:
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return " " + mandatory + " "
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else:
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return " " + mandatory + ", " + optional + " "
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def NoParameters():
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return Parameters( [], [] )
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class Alternative:
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def __init__( self, *checkers ):
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self.__checkers = checkers
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def check( self, args, kwds ):
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# Try the n - 1 first checkers
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for checker in self.__checkers[ : -1 ]:
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try:
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return checker.check( args, kwds )
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except TypeError:
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pass
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# Use the last checker
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# This way, the call stack will point to an actual validation failure
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return self.__checkers[ -1 ].check( args, kwds )
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def documentParameters( self ):
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return " <" + "> or <".join( checker.documentParameters() for checker in self.__checkers ) + "> "
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