Class: SetBuilder::Constraint

Inherits:
Object
  • Object
show all
Defined in:
lib/set_builder/constraint.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(trait, *args, &block) ⇒ Constraint

Sample constraints:

[:awesome],
[:attended, "school"],
[:died],
[:name, {:is => "Jerome"}]]



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# File 'lib/set_builder/constraint.rb', line 16

def initialize(trait, *args, &block)
  @trait, @block = trait, block
  @direct_object = args.shift if trait.requires_direct_object?
  @modifiers = trait.modifiers.collect {|modifier_type| modifier_type.new(args.shift)}
end

Instance Attribute Details

#direct_object ⇒ Object (readonly)

Returns the value of attribute direct_object.



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# File 'lib/set_builder/constraint.rb', line 24

def direct_object
  @direct_object
end

#modifiers ⇒ Object (readonly)

Returns the value of attribute modifiers.



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# File 'lib/set_builder/constraint.rb', line 24

def modifiers
  @modifiers
end

#negative ⇒ Object (readonly)

Returns the value of attribute negative.



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# File 'lib/set_builder/constraint.rb', line 24

def negative
  @negative
end

#trait ⇒ Object (readonly)

Returns the value of attribute trait.



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# File 'lib/set_builder/constraint.rb', line 24

def trait
  @trait
end

Instance Method Details

#negate(value) ⇒ Object 



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# File 'lib/set_builder/constraint.rb', line 52

def negate(value)
  @negative = value
  @negative = false if trait.noun?
  self
end

#perform(scope) ⇒ Object 



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# File 'lib/set_builder/constraint.rb', line 60

def perform(scope)
  scope.scoped(@block.call(self, scope))
end

#to_s ⇒ Object 



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# File 'lib/set_builder/constraint.rb', line 40

def to_s
  # p "ValueMap.to_s(#{direct_object_type} (#{direct_object_type.class}), #{direct_object} (#{direct_object.class}))"
  @description ||= begin
    description = trait.to_s(@negative)
    description << " #{ValueMap.to_s(direct_object_type, direct_object)}" if direct_object_required?
    description << " #{modifiers.collect{|m| m.to_s(@negative)}.join(" ")}" unless modifiers.empty?
    description
  end
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/set_builder/constraint.rb', line 34

def valid?
  (!direct_object_required? or !direct_object.nil?) and modifiers.all?(&:valid?)
end