Module: Bali::Objector::Statics

Defined in:
lib/bali/objector.rb

Instance Method Summary collapse

Instance Method Details

#can?(subtarget, operation, record = self) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bali/objector.rb', line 18

def can?(subtarget, operation, record = self)
  # if performed on a class-level, don't call its class or it will return
  # Class. That's not what is expected.
  if self.is_a?(Class)
    rule_group = Bali.rule_group_for(self, subtarget)
  else
    rule_group = Bali.rule_group_for(self.class, subtarget)
  end

  # default of can? is false whenever RuleClass for that class is undefined
  # or RuleGroup for that subtarget is not defined
  return false if rule_group.nil?

  # get the specific rule
  rule = rule_group.get_rule(:can, operation)

  # godly subtarget is allowed to do as he wishes
  # so long that the rule is not specificly defined
  return true if rule_group.zeus? && rule.nil?
  
  # plan subtarget is not allowed unless spesificly defined
  return false if rule_group.plant? && rule.nil?

  # default to false when asked about can? but no rule to be found
  return false if rule.nil?

  if rule.has_decider?
    # must test first
    decider = rule.decider
    if decider.arity == 0
      decider.() == true
    else
      decider.(record) == true
    end
  else
    # rule is properly defined
    return true
  end
end

#cant?(subtarget, operation, record = self) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bali/objector.rb', line 58

def cant?(subtarget, operation, record = self)
  if self.is_a?(Class)
    rule_group = Bali.rule_group_for(self, subtarget)
  else
    rule_group = Bali.rule_group_for(self.class, subtarget)
  end

  # default of cant? is true whenever RuleClass for that class is undefined
  # or RuleGroup for that subtarget is not defined
  return true if rule_group.nil?

  rule = rule_group.get_rule(:cant, operation)

  # godly subtarget is not to be prohibited in his endeavours
  # so long that no specific rule about this operation is defined
  return false if rule_group.zeus? && rule.nil?

  # plant subtarget is not allowed to do things unless specificly defined
  return true if rule_group.plant? && rule.nil?

  # default to true when asked about cant? but no rule to be found
  return true if rule.nil?

  if rule.has_decider?
    decider = rule.decider
    if decider.arity == 0
      decider.() == true
    else
      decider.(record) == true
    end
  end
end