Module: JSONLogic

Defined in:
lib/json_logic.rb,
lib/json_logic/version.rb,
lib/json_logic/operation.rb

Defined Under Namespace

Classes: Operation

Constant Summary collapse

VERSION = 
'0.4.5'

Class Method Summary collapse

Class Method Details

.add_operation(operator, function) ⇒ Object 


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# File 'lib/json_logic.rb', line 39

def self.add_operation(operator, function)
  Operation.class.send(:define_method, operator) do |v, d|
    function.call(v, d)
  end
end

.apply(logic, data) ⇒ Object 


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# File 'lib/json_logic.rb', line 6

def self.apply(logic, data)
  if logic.is_a?(Array)
    return logic.map { |val| apply(val, data) }
  end

  return logic unless logic.is_a?(Hash)                  # pass-thru

  data = data.stringify_keys if data.is_a?(Hash)         # Stringify keys to keep out problems with symbol/string mismatch
  operator, values = logic.first                         # unwrap single-key hash
  values = [values] unless values.is_a?(Array)           # syntactic sugar
  Operation.perform(operator, values, data || {})
end

.filter(logic, data) ⇒ Object 


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# File 'lib/json_logic.rb', line 35

def self.filter(logic, data)
  data.select { |d| apply(logic, d) }
end

.uses_data(logic) ⇒ Object 


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# File 'lib/json_logic.rb', line 19

def self.uses_data(logic)
  collection = []

  operator, values = logic.first
  values = [values] unless values.is_a?(Array)
  if operator == 'var'
    collection.append(values[0])
  else
    values.each { |val|
      collection.concat(uses_data(val))
    }
  end

  return collection.uniq
end