Class: TRuby::PredicateConstraint

Inherits:
Constraint show all
Defined in:
lib/t_ruby/constraint_checker.rb

Overview

Predicate constraint: Type where predicate_method

Instance Attribute Summary collapse

Attributes inherited from Constraint

#condition, #message, #type

Instance Method Summary collapse

Methods inherited from Constraint

#to_s

Constructor Details

#initialize(base_type:, predicate:) ⇒ PredicateConstraint

Returns a new instance of PredicateConstraint.



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# File 'lib/t_ruby/constraint_checker.rb', line 109

def initialize(base_type:, predicate:)
  @base_type = base_type
  @predicate = predicate
  super(type: :predicate, condition: predicate.to_s)
end

Instance Attribute Details

#base_type ⇒ Object (readonly)

Returns the value of attribute base_type.



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# File 'lib/t_ruby/constraint_checker.rb', line 107

def base_type
  @base_type
end

#predicate ⇒ Object (readonly)

Returns the value of attribute predicate.



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# File 'lib/t_ruby/constraint_checker.rb', line 107

def predicate
  @predicate
end

Instance Method Details

#satisfied?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/t_ruby/constraint_checker.rb', line 115

def satisfied?(value)
  if @predicate.is_a?(Proc)
    @predicate.call(value)
  elsif @predicate.is_a?(Symbol)
    value.respond_to?(@predicate) && value.send(@predicate)
  else
    false
  end
end

#validation_code(var_name) ⇒ Object 



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# File 'lib/t_ruby/constraint_checker.rb', line 125

def validation_code(var_name)
  if @predicate.is_a?(Symbol)
    "#{var_name}.#{@predicate}"
  else
    "true" # Proc constraints require runtime evaluation
  end
end