Class: Marty::DataGrid::DataGridValidator

Inherits:
ActiveModel::Validator
  • Object
show all
Defined in:
app/models/marty/data_grid.rb

Instance Method Summary collapse

Instance Method Details

#validate(dg) ⇒ Object 



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# File 'app/models/marty/data_grid.rb', line 19

def validate(dg)
  dg.errors.add(:base, "'#{dg.data_type}' not a defined type or class") unless
    Marty::DataGrid.convert_data_type(dg.data_type)

  dg.errors.add(:base, 'data must be array of arrays') unless
    dg.data.is_a?(Array) && dg.data.all? { |a| a.is_a? Array }

  dg.errors.add(:base, 'metadata must be an array of hashes') unless
    dg.metadata.is_a?(Array) && dg.metadata.all? { |a| a.is_a? Hash }

  dg.errors.add(:base, 'metadata must contain only h/v dirs') unless
    dg.metadata.all? { |h| ['h', 'v'].member? h['dir'] }

  dg.errors.add(:base, 'metadata item attrs must be unique') unless
    dg.metadata.map { |h| h['attr'] }.uniq.length == dg.metadata.length

  dg.metadata.each do |inf|
    attr, type, keys, rs_keep =
      inf['attr'], inf['type'], inf['keys'], inf['rs_keep']

    if rs_keep.present?
      m = /\A *(<|<=|>|>=)? *([a-z][a-z_0-9]+) *\z/.match(rs_keep)
      unless m
        dg.errors.add(:base, "invalid grid modifier expression: #{rs_keep}")
        next
      end
    end

    dg.errors.add(:base, 'metadata elements must have attr/type/keys') unless
      attr && type && keys

    # enforce Delorean attr syntax (a bit Draconian)
    dg.errors.add(:base, "bad attribute '#{attr}'") unless
      /^[a-z][A-Za-z0-9_]*$/.match?(attr)

    dg.errors.add(:base, "unknown metadata type #{type}") unless
      Marty::DataGrid.type_to_index(type)

    dg.errors.add(:base, 'bad metadata keys') unless
      keys.is_a?(Array) && !keys.empty?
  end

  # Check key uniqueness of vertical/horizontal key
  # combinations. FIXME: ideally, we should also check for
  # array/range key subsumption.  Those will result in runtime
  # errors anyway when multiple hits are produced.
  v_keys = dg.dir_infos('v').map { |inf| inf['keys'] }
  h_keys = dg.dir_infos('h').map { |inf| inf['keys'] }

  v_zip_keys = v_keys.empty? ? [] : v_keys[0].zip(*v_keys[1..-1])
  h_zip_keys = h_keys.empty? ? [] : h_keys[0].zip(*h_keys[1..-1])

  dg.errors.add(:base, 'duplicate horiz. key combination') unless
    h_zip_keys.uniq.length == h_zip_keys.length

  dg.errors.add(:base, 'duplicate vertical key combination') unless
    v_zip_keys.uniq.length == v_zip_keys.length

  con_chk = []
  begin
    con_chk = Marty::DataGrid::Constraint.parse(dg.data_type, dg.constraint)
  rescue StandardError => e
    dg.errors.add(:base, "Error in constraint: #{e.message}")
  end
  data_check = Marty::DataGrid::Constraint.check_data(dg.data_type,
                                                      dg.data, con_chk)
  return if data_check.blank?

  data_check.each do |(err, x, y)|
    dg.errors.add(:base, "cell #{x}, #{y} fails constraint check") if
      err == :constraint
    dg.errors.add(:base, "cell #{x}, #{y} incorrect type") if
      err == :type
  end
end