Contents

module Granite
  module Form
    module Util
      extend ActiveSupport::Concern

      # Evaluates value and returns result based on what was passed:
      # - if Proc was passed, then executes it in context of self
      # - if Symbol was passed, then calls a method with that name and returns result
      # - otherwise just returns the value itself
      # @param value [Object] value to evaluate
      # @return [Object] result of evaluation
      def evaluate(value, *args)
        value.is_a?(Symbol) ? evaluate_symbol(value, *args) : evaluate_if_proc(value, *args)
      end

      # Evaluates value and returns result based on what was passed:
      # - if Proc was passed, then executes it in context of self
      # - otherwise just returns the value itself
      # @param value [Object] value to evaluate
      # @return [Object] result of evaluation
      def evaluate_if_proc(value, *args)
        value.is_a?(Proc) ? evaluate_proc(value, *args) : value
      end

      # Evaluates `if` or `unless` conditions present in the supplied
      # `options` being it a symbol or callable.
      #
      # @param [Hash] options The method options to evaluate.
      # @option options :if method name or callable
      # @option options :unless method name or callable
      # @return [Boolean] whether conditions are satisfied
      def conditions_satisfied?(**options)
        raise ArgumentError, 'You cannot specify both if and unless' if options.key?(:if) && options.key?(:unless)

        if options.key?(:if)
          evaluate(options[:if])
        elsif options.key?(:unless)
          !evaluate(options[:unless])
        else
          true
        end
      end

      private

      def evaluate_proc(value, *args)
        instance_exec(*args, &value)
      end

      def evaluate_symbol(value, *args)
        __send__(value, *args)
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
granite-form-0.6.0	lib/granite/form/util.rb