Module: Gecode::Constraints::Util::Extensional

Defined in:
lib/gecoder/interface/constraints.rb

Overview

A module that contains utility-methods for extensional constraints.

Class Method Summary collapse

Class Method Details

.perform_tuple_checks(tuples, expected_size, &additional_test) ⇒ Object

Checks that the specified enumeration is an enumeration containing one or more tuples of the specified size. It also allows the caller to define additional tests by providing a block, which is given each tuple. If a test fails then an appropriate error is raised.



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# File 'lib/gecoder/interface/constraints.rb', line 228

def perform_tuple_checks(tuples, expected_size, &additional_test)
  unless tuples.respond_to?(:each)
    raise TypeError, 'Expected an enumeration with tuples, got ' + 
      "#{tuples.class}."
  end
  
  if tuples.empty?
    raise ArgumentError, 'One or more tuples must be specified.'
  end
  
  tuples.each do |tuple|
    unless tuple.respond_to?(:each)
      raise TypeError, 'Expected an enumeration containing enumeraions, ' +
        "got #{tuple.class}."
    end
    
    unless tuple.size == expected_size
      raise ArgumentError, 'All tuples must be of the same size as the ' + 
        'number of variables in the array.'
    end
    
    yield tuple
  end
end