text_stemmer

# Generated by Snowball.Generator — do not edit by hand.
defmodule Text.Stemmer.Stemmers.Norwegian do
  @moduledoc """
  Snowball stemmer for norwegian.

  Generated from the canonical Snowball algorithm source.
  """

  alias Snowball.Runtime
  alias Snowball.Grouping


  # Groupings
  @g_s_ending Grouping.from_string("bcdfghjlmnoptvyz")
  @g_v Grouping.from_string("aeêioòóôuyæåø")


  # Among tables
  @a_0 [
    {"leg", -1, 1, nil},
    {"eleg", 0, 1, nil},
    {"ig", -1, 1, nil},
    {"eig", 2, 1, nil},
    {"lig", 2, 1, nil},
    {"elig", 4, 1, nil},
    {"els", -1, 1, nil},
    {"lov", -1, 1, nil},
    {"elov", 7, 1, nil},
    {"slov", 7, 1, nil},
    {"hetslov", 9, 1, nil}
  ]
  @a_1 [
    {"dt", -1, -1, nil},
    {"vt", -1, -1, nil}
  ]
  @a_2 [
    {"", -1, 1, nil},
    {"ind", 0, -1, nil},
    {"kk", 0, -1, nil},
    {"nk", 0, -1, nil},
    {"amm", 0, -1, nil},
    {"omm", 0, -1, nil},
    {"kap", 0, -1, nil},
    {"skap", 6, 1, nil},
    {"pp", 0, -1, nil},
    {"lt", 0, -1, nil},
    {"ast", 0, -1, nil},
    {"øst", 0, -1, nil},
    {"v", 0, -1, nil},
    {"hav", 12, 1, nil},
    {"giv", 12, 1, nil}
  ]
  @a_3 [
    {"a", -1, 1, nil},
    {"e", -1, 1, nil},
    {"ede", 1, 1, nil},
    {"ande", 1, 1, nil},
    {"ende", 1, 1, nil},
    {"ane", 1, 1, nil},
    {"ene", 1, 1, nil},
    {"hetene", 6, 1, nil},
    {"erte", 1, 4, nil},
    {"en", -1, 1, nil},
    {"heten", 9, 1, nil},
    {"ar", -1, 1, nil},
    {"er", -1, 1, nil},
    {"heter", 12, 1, nil},
    {"s", -1, 3, nil},
    {"as", 14, 1, nil},
    {"es", 14, 1, nil},
    {"edes", 16, 1, nil},
    {"endes", 16, 1, nil},
    {"enes", 16, 1, nil},
    {"hetenes", 19, 1, nil},
    {"ens", 14, 1, nil},
    {"hetens", 21, 1, nil},
    {"ers", 14, 2, nil},
    {"ets", 14, 1, nil},
    {"et", -1, 1, nil},
    {"het", 25, 1, nil},
    {"ert", -1, 4, nil},
    {"ast", -1, 1, nil}
  ]

  @doc """
  Stem a word.

  ### Arguments

  * `word` is a UTF-8 binary.

  ### Returns

  * The stemmed UTF-8 binary.

  """
  @spec stem(binary()) :: binary()
  def stem(word) when is_binary(word) do
    state = Runtime.new(word) |> init_vars()
    state = run_stem(state)
    Runtime.assign_to(state)
  end

  defp init_vars(state), do: %{state | vars: %{p1: 0, x: 0}}

  defp run_stem(%Runtime{} = state) do
    {_, state} = r_stem(state)
    state
  end

  # Snowball runtime helpers.
  defp snowball_do_f(state, fun) do
    saved_c = state.cursor
    {_, s} = fun.(state)
    %{s | cursor: saved_c}
  end

  defp snowball_do_b(state, fun) do
    rel = state.limit - state.cursor
    {_, s} = fun.(state)
    %{s | cursor: s.limit - rel}
  end

  defp snowball_test_f(state, fun) do
    saved_c = state.cursor
    case fun.(state) do
      {:ok, s} -> {:ok, %{s | cursor: saved_c}}
      {:fail, s} -> {:fail, %{s | cursor: saved_c}}
    end
  end

  defp snowball_test_b(state, fun) do
    rel = state.limit - state.cursor
    case fun.(state) do
      {:ok, s} -> {:ok, %{s | cursor: s.limit - rel}}
      {:fail, s} -> {:fail, %{s | cursor: s.limit - rel}}
    end
  end

  defp snowball_try(state, fun) do
    rel = state.limit - state.cursor
    case fun.(state) do
      {:ok, s} -> s
      {:fail, s} -> %{s | cursor: s.limit - rel}
    end
  end

  defp snowball_or(state, fun1, fun2) do
    rel = state.limit - state.cursor
    case fun1.(state) do
      {:ok, s} -> {:ok, s}
      {:fail, s} -> fun2.(%{s | cursor: s.limit - rel})
    end
  end

  defp lift(state, :fail), do: {:fail, state}
  defp lift(_state, %Runtime{} = s), do: {:ok, s}

  defp next_codepoint(%Runtime{cursor: c, limit: lim, current: cur} = state) do
    case Runtime.codepoint_at(cur, c, lim) do
      {_cp, size} -> {:ok, %{state | cursor: c + size}}
      :error -> {:fail, state}
    end
  end

  defp next_codepoint_b(%Runtime{cursor: c, limit_backward: lb, current: cur} = state) do
    case Runtime.codepoint_before(cur, c, lb) do
      {_cp, size} -> {:ok, %{state | cursor: c - size}}
      :error -> {:fail, state}
    end
  end

  defp r_other_suffix(%Runtime{} = state) do
    (fn ->
      old_limit = state.limit_backward
      case (fn state ->
        (fn ->
          target = state.vars[:p1]
          if target < state.limit_backward or target > state.limit do
            {:fail, state}
          else
            {:ok, %{state | cursor: target}}
          end
        end).()
      end).(state) do
        {:fail, _} -> {:fail, state}
        {:ok, limit_state} ->
          state = %{state | ket: state.cursor, limit_backward: limit_state.cursor}
          case Runtime.find_among_b(state, @a_0) do
            :fail -> {:fail, %{state | limit_backward: old_limit}}
            {%Runtime{} = s, result} ->
              state = %{s | bra: s.cursor, limit_backward: old_limit}
          case result do
                    1 ->
                      {:ok, Runtime.slice_del(state)}
            _ -> {:ok, state}
          end
          end
      end
    end).()
  end

  defp r_consonant_pair(%Runtime{} = state) do
    case (fn state ->
      snowball_test_b(state, fn state ->
        (fn ->
          old_limit = state.limit_backward
          case (fn state ->
            (fn ->
              target = state.vars[:p1]
              if target < state.limit_backward or target > state.limit do
                {:fail, state}
              else
                {:ok, %{state | cursor: target}}
              end
            end).()
          end).(state) do
            {:fail, _} -> {:fail, state}
            {:ok, limit_state} ->
              state = %{state | ket: state.cursor, limit_backward: limit_state.cursor}
              case Runtime.find_among_b(state, @a_1) do
                :fail -> {:fail, %{state | limit_backward: old_limit}}
                {%Runtime{} = s, _result} ->
                  state = %{s | bra: s.cursor, limit_backward: old_limit}
              {:ok, state}
              end
          end
        end).()
      end)
    end).(state) do
      {:ok, state} ->
      case (fn state ->
        next_codepoint_b(state)
      end).(state) do
        {:ok, state} ->
        case (fn state ->
          {:ok, %{state | bra: state.cursor}}
        end).(state) do
          {:ok, state} ->
          {:ok, Runtime.slice_del(state)}
        end
        r -> r
      end
      r -> r
    end
  end

  defp r_main_suffix(%Runtime{} = state) do
    (fn ->
      old_limit = state.limit_backward
      case (fn state ->
        (fn ->
          target = state.vars[:p1]
          if target < state.limit_backward or target > state.limit do
            {:fail, state}
          else
            {:ok, %{state | cursor: target}}
          end
        end).()
      end).(state) do
        {:fail, _} -> {:fail, state}
        {:ok, limit_state} ->
          state = %{state | ket: state.cursor, limit_backward: limit_state.cursor}
          case Runtime.find_among_b(state, @a_3) do
            :fail -> {:fail, %{state | limit_backward: old_limit}}
            {%Runtime{} = s, result} ->
              state = %{s | bra: s.cursor, limit_backward: old_limit}
          case result do
                    1 ->
                      {:ok, Runtime.slice_del(state)}
                    2 ->
                      (fn ->
                        case Runtime.find_among_b(state, @a_2) do
                          :fail -> {:fail, state}
                          {%Runtime{} = s, result} ->
                            state = s
                            case result do
                              1 ->
                                {:ok, Runtime.slice_del(state)}
                              _ -> {:ok, s}
                            end
                        end
                      end).()
                    3 ->
                      case (fn state ->
                        snowball_or(state,
                          fn state ->
                            snowball_or(state,
                              fn state ->
                                lift(state, Runtime.in_grouping_b(state, @g_s_ending))
                              end,
                              fn state ->
                                case (fn state ->
                                  lift(state, Runtime.eq_s_b(state, "r"))
                                end).(state) do
                                  {:ok, state} ->
                                  (fn state ->
                                    saved_c = state.cursor
                                    case (fn state ->
                                    lift(state, Runtime.eq_s_b(state, "e"))
                                    end).(state) do
                                      {:ok, s} -> {:fail, %{s | cursor: saved_c}}
                                      {:fail, s} -> {:ok, %{s | cursor: saved_c}}
                                    end
                                  end).(state)
                                  r -> r
                                end
                              end)
                          end,
                          fn state ->
                            case (fn state ->
                              lift(state, Runtime.eq_s_b(state, "k"))
                            end).(state) do
                              {:ok, state} ->
                              lift(state, Runtime.out_grouping_b(state, @g_v))
                              r -> r
                            end
                          end)
                      end).(state) do
                        {:ok, state} ->
                        {:ok, Runtime.slice_del(state)}
                        r -> r
                      end
                    4 ->
                      {:ok, Runtime.slice_from(state, "er")}
            _ -> {:ok, state}
          end
          end
      end
    end).()
  end

  defp r_mark_regions(%Runtime{} = state) do
    case (fn state ->
      {:ok, put_in(state.vars[:p1], state.limit)}
    end).(state) do
      {:ok, state} ->
      case (fn state ->
        snowball_test_f(state, fn state ->
          case (fn state ->
            (fn ->
              n = 3
              Enum.reduce_while(1..max(n, 0)//1, {:ok, state}, fn _, {:ok, s} ->
                case next_codepoint(s) do
                  {:ok, s2} -> {:cont, {:ok, s2}}
                  {:fail, _} -> {:halt, {:fail, state}}
                end
              end)
            end).()
          end).(state) do
            {:ok, state} ->
            {:ok, put_in(state.vars[:x], state.cursor)}
            r -> r
          end
        end)
      end).(state) do
        {:ok, state} ->
        case (fn state ->
          case Runtime.go_out_grouping(state, @g_v) do
            :fail -> {:fail, state}
            %Runtime{} = s -> next_codepoint(s)
          end
        end).(state) do
          {:ok, state} ->
          case (fn state ->
            case Runtime.go_in_grouping(state, @g_v) do
              :fail -> {:fail, state}
              %Runtime{} = s -> next_codepoint(s)
            end
          end).(state) do
            {:ok, state} ->
            case (fn state ->
              {:ok, put_in(state.vars[:p1], state.cursor)}
            end).(state) do
              {:ok, state} ->
              {:ok, snowball_try(state, fn state ->
                case (fn state ->
                  if state.vars[:p1] < state.vars[:x], do: {:ok, state}, else: {:fail, state}
                end).(state) do
                  {:ok, state} ->
                  {:ok, put_in(state.vars[:p1], state.vars[:x])}
                  r -> r
                end
              end)}
            end
            r -> r
          end
          r -> r
        end
        r -> r
      end
    end
  end

  defp r_stem(%Runtime{} = state) do
    case (fn state ->
      {:ok, snowball_do_f(state, fn state ->
        r_mark_regions(state)
      end)}
    end).(state) do
      {:ok, state} ->
      (fn state ->
        old_cursor = state.cursor
        old_lb = state.limit_backward
        state = %{state | cursor: state.limit, limit_backward: old_cursor}
        {tag, s} = (fn state ->
          case (fn state ->
            {:ok, snowball_do_b(state, fn state ->
              r_main_suffix(state)
            end)}
          end).(state) do
            {:ok, state} ->
            case (fn state ->
              {:ok, snowball_do_b(state, fn state ->
                r_consonant_pair(state)
              end)}
            end).(state) do
              {:ok, state} ->
              {:ok, snowball_do_b(state, fn state ->
                r_other_suffix(state)
              end)}
            end
          end
        end).(state)
        {tag, %{s | cursor: old_cursor, limit_backward: old_lb}}
      end).(state)
    end
  end

end