Class: TreeFilter::Slice

Inherits:
Struct
  • Object
show all
Defined in:
lib/tree_filter.rb

Instance Method Summary collapse

Constructor Details

#initialize(attrs = {}) ⇒ Slice

Returns a new instance of Slice.



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# File 'lib/tree_filter.rb', line 93

def initialize(attrs = {})
  super
  @attrs = attrs
end

Instance Method Details

#filter(value) ⇒ Object 



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# File 'lib/tree_filter.rb', line 98

def filter(value)
  # With activesupport this will always be evaluated, because `as_json` is
  # monkey-patched on to Object.
  value = value.as_json if value.respond_to?(:as_json)

  case value
  when Hash
    slices = @attrs.dup

    if @attrs.keys.include?('*')
      slices.delete("*")
      extra = value.keys - slices.keys - ['*']
      extra.each do |k|
        slices[k] = nil
      end
    end

    slices.each_with_object({}) do |(attr, slice), ret|
      slice ||= NullSlice.new

      val = value[attr]

      filtered = case val
      when Array
        val.map {|x| slice.filter(x) }
      else
        slice.filter(val)
      end

      ret[attr] = filtered
    end
  when Array
    value.map {|x| filter(x) }
  when Defer
    filter(value.call)
  when Leaf
    filter(value.right)
  else
    value
  end
end

#inspect ⇒ Object 



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# File 'lib/tree_filter.rb', line 89

def inspect
  "<Slice #{@attrs.inspect}>"
end