text_stemmer

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

  Generated from the canonical Snowball algorithm source.
  """

  alias Snowball.Runtime
  alias Snowball.Grouping


  # Groupings
  @g_c Grouping.from_string("bcdfghjklmnpqrstvwxz")
  @g_s_ending Grouping.from_string("abcdfghjklmnoprtvyzå")
  @g_v Grouping.from_string("aeiouyæåø")


  # Among tables
  @a_0 [
    {"ig", -1, 1, nil},
    {"lig", 0, 1, nil},
    {"elig", 1, 1, nil},
    {"els", -1, 1, nil},
    {"løst", -1, 2, nil}
  ]
  @a_1 [
    {"gd", -1, -1, nil},
    {"dt", -1, -1, nil},
    {"gt", -1, -1, nil},
    {"kt", -1, -1, nil}
  ]
  @a_2 [
    {"hed", -1, 1, nil},
    {"ethed", 0, 1, nil},
    {"ered", -1, 1, nil},
    {"e", -1, 1, nil},
    {"erede", 3, 1, nil},
    {"ende", 3, 1, nil},
    {"erende", 5, 1, nil},
    {"ene", 3, 1, nil},
    {"erne", 3, 1, nil},
    {"ere", 3, 1, nil},
    {"en", -1, 1, nil},
    {"heden", 10, 1, nil},
    {"eren", 10, 1, nil},
    {"er", -1, 1, nil},
    {"heder", 13, 1, nil},
    {"erer", 13, 1, nil},
    {"s", -1, 2, nil},
    {"heds", 16, 1, nil},
    {"es", 16, 1, nil},
    {"endes", 18, 1, nil},
    {"erendes", 19, 1, nil},
    {"enes", 18, 1, nil},
    {"ernes", 18, 1, nil},
    {"eres", 18, 1, nil},
    {"ens", 16, 1, nil},
    {"hedens", 24, 1, nil},
    {"erens", 24, 1, nil},
    {"ers", 16, 1, nil},
    {"ets", 16, 1, nil},
    {"erets", 28, 1, nil},
    {"et", -1, 1, nil},
    {"eret", 30, 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, ch: ""}}

  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 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_undouble(%Runtime{} = state) do
    case (fn state ->
      (fn ->
        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} ->
            old_lb = state.limit_backward
            state = %{state | limit_backward: limit_state.cursor}
            case (fn state ->
          case (fn state ->
            {:ok, %{state | ket: state.cursor}}
          end).(state) do
            {:ok, state} ->
            case (fn state ->
              lift(state, Runtime.in_grouping_b(state, @g_c))
            end).(state) do
              {:ok, state} ->
              case (fn state ->
                {:ok, %{state | bra: state.cursor}}
              end).(state) do
                {:ok, state} ->
                {:ok, put_in(state.vars[:ch], Runtime.slice_to(state))}
              end
              r -> r
            end
          end
            end).(state) do
              {:ok, s} -> {:ok, %{s | limit_backward: old_lb}}
              {:fail, s} -> {:fail, %{s | limit_backward: old_lb}}
            end
        end
      end).()
    end).(state) do
      {:ok, state} ->
      case (fn state ->
        lift(state, Runtime.eq_s_b(state, state.vars[:ch]))
      end).(state) do
        {:ok, state} ->
        {:ok, Runtime.slice_del(state)}
        r -> r
      end
      r -> r
    end
  end

  defp r_other_suffix(%Runtime{} = state) do
    case (fn state ->
      {:ok, snowball_do_b(state, fn state ->
        case (fn state ->
          {:ok, %{state | ket: state.cursor}}
        end).(state) do
          {:ok, state} ->
          case (fn state ->
            lift(state, Runtime.eq_s_b(state, "st"))
          end).(state) do
            {:ok, state} ->
            case (fn state ->
              {:ok, %{state | bra: state.cursor}}
            end).(state) do
              {:ok, state} ->
              case (fn state ->
                lift(state, Runtime.eq_s_b(state, "ig"))
              end).(state) do
                {:ok, state} ->
                {:ok, Runtime.slice_del(state)}
                r -> r
              end
            end
            r -> r
          end
        end
      end)}
    end).(state) do
      {:ok, 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_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 ->
                        case (fn state ->
                          {:ok, Runtime.slice_del(state)}
                        end).(state) do
                          {:ok, state} ->
                          {:ok, snowball_do_b(state, fn state ->
                            r_consonant_pair(state)
                          end)}
                        end
                      2 ->
                        {:ok, Runtime.slice_from(state, "løs")}
              _ -> {:ok, state}
            end
            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_2) 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 ->
                      case (fn state ->
                        lift(state, Runtime.in_grouping_b(state, @g_s_ending))
                      end).(state) do
                        {:ok, state} ->
                        {:ok, Runtime.slice_del(state)}
                        r -> r
                      end
            _ -> {: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} ->
              case (fn state ->
                {:ok, snowball_do_b(state, fn state ->
                  r_other_suffix(state)
                end)}
              end).(state) do
                {:ok, state} ->
                {:ok, snowball_do_b(state, fn state ->
                  r_undouble(state)
                end)}
              end
            end
          end
        end).(state)
        {tag, %{s | cursor: old_cursor, limit_backward: old_lb}}
      end).(state)
    end
  end

end