module JSONLogic
Constants
- ITERABLE_KEY
- VERSION
Public Class Methods
add_operation(operator, function)
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# File lib/json_logic.rb, line 63 def self.add_operation(operator, function) Operation.class.send(:define_method, operator) do |v, d| function.call(v, d) end end
apply(logic, data)
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# File lib/json_logic.rb, line 6 def self.apply(logic, data) if logic.is_a?(Array) logic.map do |val| apply(val, data) end elsif !logic.is_a?(Hash) # Pass-thru logic else if data.is_a?(Hash) data = data.stringify_keys end data ||= {} operator, values = operator_and_values_from_logic(logic) Operation.perform(operator, values, data) end end
filter(logic, data)
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# File lib/json_logic.rb, line 59 def self.filter(logic, data) data.select { |d| apply(logic, d) } end
operator_and_values_from_logic(logic)
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# File lib/json_logic.rb, line 47 def self.operator_and_values_from_logic(logic) # Unwrap single-key hash operator, values = logic.first # Ensure values is an array if !values.is_a?(Array) values = [values] end [operator, values] end
uses_data(logic)
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Return a list of the non-literal data used. Eg, if the logic contains a {'var' => 'bananas'} operation, the result of uses_data
on this logic will be a collection containing 'bananas'
# File lib/json_logic.rb, line 27 def self.uses_data(logic) collection = [] if logic.kind_of?(Hash) || logic.kind_of?(Array) # If we are still dealing with logic, keep going. Else it's a value. operator, values = operator_and_values_from_logic(logic) if operator == 'var' # TODO: It may be that non-var operators use data so we may want a flag or collection that indicates data use. if values[0] != JSONLogic::ITERABLE_KEY collection << values[0] end else values.each do |val| collection.concat(uses_data(val)) end end end return collection.uniq end