Class: Yargi::AndPredicate

Inherits:
Predicate show all
Defined in:
lib/yargi/predicate.rb

Overview

Conjunction predicate

Constant Summary

Constants inherited from Predicate

Predicate::ALL, Predicate::NONE

Instance Method Summary collapse

Methods inherited from Predicate

#not, to_predicate, #|

Constructor Details

#initialize(*anded) ⇒ AndPredicate

Builds a AND predicate

Raises:

  • (ArgumentError) 


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# File 'lib/yargi/predicate.rb', line 159

def initialize(*anded)
  raise ArgumentError, "Predicates expected" unless anded.all?{|p| Predicate===p}
  @anded = anded
end

Instance Method Details

#&(right) ⇒ Object

Pushes right in the anded array



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# File 'lib/yargi/predicate.rb', line 170

def &(right)
  @anded << Predicate.to_predicate(right)
  self
end

#===(elm) ⇒ Object

Predicate implementation



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# File 'lib/yargi/predicate.rb', line 165

def ===(elm)
  @anded.all?{|p| p===elm}
end

#inspect ⇒ Object

Helps debugging predicates



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# File 'lib/yargi/predicate.rb', line 176

def inspect
  @anded.inject('') do |memo,p|
    if memo.empty?
      p.inspect
    else
      "#{memo} and #{p.inspect}"
    end
  end
end