Class: Arel::SqlToArel::PgQueryVisitor::FrameOptions

Inherits:
Object
  • Object
show all
Defined in:
lib/arel/sql_to_arel/pg_query_visitor/frame_options.rb

Class Method Summary collapse

Class Method Details

.arel(frame_options, start_offset, end_offset) ⇒ Object 



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# File 'lib/arel/sql_to_arel/pg_query_visitor/frame_options.rb', line 6

def arel(frame_options, start_offset, end_offset)
  frame_option_names = calculate_frame_option_names(frame_options)
  return unless frame_option_names.include?('FRAMEOPTION_NONDEFAULT')

  range_klass = if frame_option_names.include?('FRAMEOPTION_RANGE')
                  Arel::Nodes::Range
                else
                  Arel::Nodes::Rows
                end

  start_node = calculate_frame_node(
    'FRAMEOPTION_START_',
    frame_option_names,
    start_offset,
  )
  end_node = calculate_frame_node(
    'FRAMEOPTION_END_',
    frame_option_names,
    end_offset,
  )

  if frame_option_names.include?('FRAMEOPTION_BETWEEN')
    Arel::Nodes::Between.new(
      range_klass.new,
      Arel::Nodes::And.new([start_node, end_node]),
    )
  else
    range_klass.new start_node
  end
end