Class: Surrogate::ArgumentErrorizer

Inherits:
Object
  • Object
show all
Defined in:
lib/surrogate/argument_errorizer.rb

Overview

Give it a name and lambda, it will raise an argument error if they don’t match, without actually invoking the method. Its error message includes the signature of the message (maybe should also show what was passed in?)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, lambda_or_method) ⇒ ArgumentErrorizer

Returns a new instance of ArgumentErrorizer.



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# File 'lib/surrogate/argument_errorizer.rb', line 8

def initialize(name, lambda_or_method)
  must_be_lambda_or_method lambda_or_method
  self.name, self.empty_lambda = name.to_s, lambda_with_same_params_as(lambda_or_method)
end

Instance Attribute Details

#empty_lambda ⇒ Object

Returns the value of attribute empty_lambda.



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# File 'lib/surrogate/argument_errorizer.rb', line 6

def empty_lambda
  @empty_lambda
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/surrogate/argument_errorizer.rb', line 6

def name
  @name
end

Instance Method Details

#match!(*args) ⇒ Object 



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# File 'lib/surrogate/argument_errorizer.rb', line 13

def match!(*args)
  empty_lambda.call *args
rescue ArgumentError => e
  raise ArgumentError, e.message + " in #{name}(#{lambda_signature empty_lambda})"
end