module Tnql
  grammar Dates
    rule fuzzy_date
      date:(between_dates / on_dates) word_break <Nodes::FuzzyDateNode>
    end

    rule on_dates
      space ('on' / 'in') space date_fragment <Nodes::SpecificDateNode>
    end

    rule between_dates
      space 'between' space start:date_fragment space 'and' space finish:date_fragment <Nodes::FragmentedDateRangeNode>
    end

    rule date_fragment
     fragment:(daterange / chronic_date) word_break <Nodes::DateFragmentNode>
    end

    rule daterange
      day_or_month? day_or_month? year <Nodes::DateRangeNode>
    end

    rule day_or_month
      [0-9] 1..2 ('.' / '/')
    end

    rule year
      [0-9] 4..4
    end

    rule chronic_date
      (!(space ('and' / 'at' / 'with' / 'who')) .)+ <Nodes::ChronicDateNode>
    end
  end
end