Class: RBS::VarianceCalculator::Result

Inherits:
Object
  • Object
show all
Defined in:
lib/rbs/variance_calculator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(variables:) ⇒ Result

Returns a new instance of Result.



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# File 'lib/rbs/variance_calculator.rb', line 6

def initialize(variables:)
  @result = {}
  variables.each do |x|
    result[x] = :unused
  end
end

Instance Attribute Details

#result ⇒ Object (readonly)

Returns the value of attribute result.



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# File 'lib/rbs/variance_calculator.rb', line 4

def result
  @result
end

Instance Method Details

#compatible?(var, with_annotation:) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rbs/variance_calculator.rb', line 43

def compatible?(var, with_annotation:)
  variance = result[var]

  case
  when variance == :unused
    true
  when with_annotation == :invariant
    true
  when variance == with_annotation
    true
  else
    false
  end
end

#contravariant(x) ⇒ Object 



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# File 'lib/rbs/variance_calculator.rb', line 22

def contravariant(x)
  case result[x]
  when :unused
    result[x] = :contravariant
  when :covariant
    result[x] = :invariant
  end
end

#covariant(x) ⇒ Object 



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# File 'lib/rbs/variance_calculator.rb', line 13

def covariant(x)
  case result[x]
  when :unused
    result[x] = :covariant
  when :contravariant
    result[x] = :invariant
  end
end

#each(&block) ⇒ Object 



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# File 'lib/rbs/variance_calculator.rb', line 35

def each(&block)
  result.each(&block)
end

#include?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rbs/variance_calculator.rb', line 39

def include?(name)
  result.key?(name)
end

#incompatible?(params) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rbs/variance_calculator.rb', line 58

def incompatible?(params)
  # @type set: Hash[Symbol]
  set = Set[]

  params.each do |param|
    unless compatible?(param.name, with_annotation: param.variance)
      set << param.name
    end
  end

  unless set.empty?
    set
  end
end

#invariant(x) ⇒ Object 



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# File 'lib/rbs/variance_calculator.rb', line 31

def invariant(x)
  result[x] = :invariant
end