class Reline::Unicode

# File reline/unicode.rb, line 98
def self.calculate_width(str, allow_escape_code = false)
  if allow_escape_code
    width = 0
    rest = str.encode(Encoding::UTF_8)
    in_zero_width = false
    rest.scan(WIDTH_SCANNER) do |non_printing_start, non_printing_end, csi, osc, gc|
      case
      when non_printing_start
        in_zero_width = true
      when non_printing_end
        in_zero_width = false
      when csi, osc
      when gc
        unless in_zero_width
          width += get_mbchar_width(gc)
        end
      end
    end
    width
  else
    str.encode(Encoding::UTF_8).grapheme_clusters.inject(0) { |w, gc|
      w + get_mbchar_width(gc)
    }
  end
end

# File reline/unicode.rb, line 352
def self.ed_transpose_words(line, byte_pointer)
  right_word_start = nil
  size = get_next_mbchar_size(line, byte_pointer)
  mbchar = line.byteslice(byte_pointer, size)
  if size.zero?
    # ' aaa bbb [cursor]'
    byte_size = 0
    while 0 < (byte_pointer + byte_size)
      size = get_prev_mbchar_size(line, byte_pointer + byte_size)
      mbchar = line.byteslice(byte_pointer + byte_size - size, size)
      break if mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
      byte_size -= size
    end
    while 0 < (byte_pointer + byte_size)
      size = get_prev_mbchar_size(line, byte_pointer + byte_size)
      mbchar = line.byteslice(byte_pointer + byte_size - size, size)
      break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
      byte_size -= size
    end
    right_word_start = byte_pointer + byte_size
    byte_size = 0
    while line.bytesize > (byte_pointer + byte_size)
      size = get_next_mbchar_size(line, byte_pointer + byte_size)
      mbchar = line.byteslice(byte_pointer + byte_size, size)
      break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
      byte_size += size
    end
    after_start = byte_pointer + byte_size
  elsif mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
    # ' aaa bb[cursor]b'
    byte_size = 0
    while 0 < (byte_pointer + byte_size)
      size = get_prev_mbchar_size(line, byte_pointer + byte_size)
      mbchar = line.byteslice(byte_pointer + byte_size - size, size)
      break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
      byte_size -= size
    end
    right_word_start = byte_pointer + byte_size
    byte_size = 0
    while line.bytesize > (byte_pointer + byte_size)
      size = get_next_mbchar_size(line, byte_pointer + byte_size)
      mbchar = line.byteslice(byte_pointer + byte_size, size)
      break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
      byte_size += size
    end
    after_start = byte_pointer + byte_size
  else
    byte_size = 0
    while (line.bytesize - 1) > (byte_pointer + byte_size)
      size = get_next_mbchar_size(line, byte_pointer + byte_size)
      mbchar = line.byteslice(byte_pointer + byte_size, size)
      break if mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
      byte_size += size
    end
    if (byte_pointer + byte_size) == (line.bytesize - 1)
      # ' aaa bbb [cursor] '
      after_start = line.bytesize
      while 0 < (byte_pointer + byte_size)
        size = get_prev_mbchar_size(line, byte_pointer + byte_size)
        mbchar = line.byteslice(byte_pointer + byte_size - size, size)
        break if mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
        byte_size -= size
      end
      while 0 < (byte_pointer + byte_size)
        size = get_prev_mbchar_size(line, byte_pointer + byte_size)
        mbchar = line.byteslice(byte_pointer + byte_size - size, size)
        break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
        byte_size -= size
      end
      right_word_start = byte_pointer + byte_size
    else
      # ' aaa [cursor] bbb '
      right_word_start = byte_pointer + byte_size
      while line.bytesize > (byte_pointer + byte_size)
        size = get_next_mbchar_size(line, byte_pointer + byte_size)
        mbchar = line.byteslice(byte_pointer + byte_size, size)
        break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
        byte_size += size
      end
      after_start = byte_pointer + byte_size
    end
  end
  byte_size = right_word_start - byte_pointer
  while 0 < (byte_pointer + byte_size)
    size = get_prev_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size - size, size)
    break if mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
    byte_size -= size
  end
  middle_start = byte_pointer + byte_size
  byte_size = middle_start - byte_pointer
  while 0 < (byte_pointer + byte_size)
    size = get_prev_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size - size, size)
    break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
    byte_size -= size
  end
  left_word_start = byte_pointer + byte_size
  [left_word_start, middle_start, right_word_start, after_start]
end

# File reline/unicode.rb, line 312
def self.em_backward_word(line, byte_pointer)
  width = 0
  byte_size = 0
  while 0 < (byte_pointer - byte_size)
    size = get_prev_mbchar_size(line, byte_pointer - byte_size)
    mbchar = line.byteslice(byte_pointer - byte_size - size, size)
    break if mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  while 0 < (byte_pointer - byte_size)
    size = get_prev_mbchar_size(line, byte_pointer - byte_size)
    mbchar = line.byteslice(byte_pointer - byte_size - size, size)
    break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [byte_size, width]
end

# File reline/unicode.rb, line 332
def self.em_big_backward_word(line, byte_pointer)
  width = 0
  byte_size = 0
  while 0 < (byte_pointer - byte_size)
    size = get_prev_mbchar_size(line, byte_pointer - byte_size)
    mbchar = line.byteslice(byte_pointer - byte_size - size, size)
    break if mbchar =~ /\S/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  while 0 < (byte_pointer - byte_size)
    size = get_prev_mbchar_size(line, byte_pointer - byte_size)
    mbchar = line.byteslice(byte_pointer - byte_size - size, size)
    break if mbchar =~ /\s/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [byte_size, width]
end

# File reline/unicode.rb, line 263
def self.em_forward_word(line, byte_pointer)
  width = 0
  byte_size = 0
  while line.bytesize > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    break if mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  while line.bytesize > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [byte_size, width]
end

# File reline/unicode.rb, line 283
def self.em_forward_word_with_capitalization(line, byte_pointer)
  width = 0
  byte_size = 0
  new_str = String.new
  while line.bytesize > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    break if mbchar.encode(Encoding::UTF_8) =~ /\p{Word}/
    new_str += mbchar
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  first = true
  while line.bytesize > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    break if mbchar.encode(Encoding::UTF_8) =~ /\P{Word}/
    if first
      new_str += mbchar.upcase
      first = false
    else
      new_str += mbchar.downcase
    end
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [byte_size, width, new_str]
end

# File reline/unicode.rb, line 44
def self.escape_for_print(str)
  str.chars.map! { |gr|
    case gr
    when -"\n"
      gr
    when -"\t"
      -'  '
    else
      EscapedPairs[gr.ord] || gr
    end
  }.join
end

# File reline/unicode.rb, line 75
def self.get_mbchar_width(mbchar)
  ord = mbchar.ord
  if ord <= 0x1F # in EscapedPairs
    return 2
  elsif ord <= 0x7E # printable ASCII chars
    return 1
  end
  utf8_mbchar = mbchar.encode(Encoding::UTF_8)
  ord = utf8_mbchar.ord
  chunk_index = EastAsianWidth::CHUNK_LAST.bsearch_index { |o| ord <= o }
  size = EastAsianWidth::CHUNK_WIDTH[chunk_index]
  if size == -1
    Reline.ambiguous_width
  elsif size == 1 && utf8_mbchar.size >= 2
    second_char_ord = utf8_mbchar[1].ord
    # Halfwidth Dakuten Handakuten
    # Only these two character has Letter Modifier category and can be combined in a single grapheme cluster
    (second_char_ord == 0xFF9E || second_char_ord == 0xFF9F) ? 2 : 1
  else
    size
  end
end

# File reline/unicode.rb, line 249
def self.get_next_mbchar_size(line, byte_pointer)
  grapheme = line.byteslice(byte_pointer..-1).grapheme_clusters.first
  grapheme ? grapheme.bytesize : 0
end

# File reline/unicode.rb, line 254
def self.get_prev_mbchar_size(line, byte_pointer)
  if byte_pointer.zero?
    0
  else
    grapheme = line.byteslice(0..(byte_pointer - 1)).grapheme_clusters.last
    grapheme ? grapheme.bytesize : 0
  end
end

# File reline/unicode.rb, line 57
def self.safe_encode(str, encoding)
  # Reline only supports utf-8 convertible string.
  converted = str.encode(encoding, invalid: :replace, undef: :replace)
  return converted if str.encoding == Encoding::UTF_8 || converted.encoding == Encoding::UTF_8 || converted.ascii_only?

  # This code is essentially doing the same thing as
  # `str.encode(utf8, **replace_options).encode(encoding, **replace_options)`
  # but also avoids unneccesary irreversible encoding conversion.
  converted.gsub(/\X/) do |c|
    c.encode(Encoding::UTF_8)
    c
  rescue Encoding::UndefinedConversionError
    '?'
  end
end

# File reline/unicode.rb, line 124
def self.split_by_width(str, max_width, encoding = str.encoding, offset: 0)
  lines = [String.new(encoding: encoding)]
  height = 1
  width = offset
  rest = str.encode(Encoding::UTF_8)
  in_zero_width = false
  seq = String.new(encoding: encoding)
  rest.scan(WIDTH_SCANNER) do |non_printing_start, non_printing_end, csi, osc, gc|
    case
    when non_printing_start
      in_zero_width = true
      lines.last << NON_PRINTING_START
    when non_printing_end
      in_zero_width = false
      lines.last << NON_PRINTING_END
    when csi
      lines.last << csi
      unless in_zero_width
        if csi == -"\e[m" || csi == -"\e[0m"
          seq.clear
        else
          seq << csi
        end
      end
    when osc
      lines.last << osc
      seq << osc
    when gc
      unless in_zero_width
        mbchar_width = get_mbchar_width(gc)
        if (width += mbchar_width) > max_width
          width = mbchar_width
          lines << nil
          lines << seq.dup
          height += 1
        end
      end
      lines.last << gc
    end
  end
  # The cursor moves to next line in first
  if width == max_width
    lines << nil
    lines << String.new(encoding: encoding)
    height += 1
  end
  [lines, height]
end

# File reline/unicode.rb, line 178
def self.take_mbchar_range(str, start_col, width, cover_begin: false, cover_end: false, padding: false)
  chunk = String.new(encoding: str.encoding)

  end_col = start_col + width
  total_width = 0
  rest = str.encode(Encoding::UTF_8)
  in_zero_width = false
  chunk_start_col = nil
  chunk_end_col = nil
  has_csi = false
  rest.scan(WIDTH_SCANNER) do |non_printing_start, non_printing_end, csi, osc, gc|
    case
    when non_printing_start
      in_zero_width = true
      chunk << NON_PRINTING_START
    when non_printing_end
      in_zero_width = false
      chunk << NON_PRINTING_END
    when csi
      has_csi = true
      chunk << csi
    when osc
      chunk << osc
    when gc
      if in_zero_width
        chunk << gc
        next
      end

      mbchar_width = get_mbchar_width(gc)
      prev_width = total_width
      total_width += mbchar_width

      if (cover_begin || padding ? total_width <= start_col : prev_width < start_col)
        # Current character haven't reached start_col yet
        next
      elsif padding && !cover_begin && prev_width < start_col && start_col < total_width
        # Add preceding padding. This padding might have background color.
        chunk << ' '
        chunk_start_col ||= start_col
        chunk_end_col = total_width
        next
      elsif (cover_end ? prev_width < end_col : total_width <= end_col)
        # Current character is in the range
        chunk << gc
        chunk_start_col ||= prev_width
        chunk_end_col = total_width
        break if total_width >= end_col
      else
        # Current character exceeds end_col
        if padding && end_col < total_width
          # Add succeeding padding. This padding might have background color.
          chunk << ' '
          chunk_start_col ||= prev_width
          chunk_end_col = end_col
        end
        break
      end
    end
  end
  chunk_start_col ||= start_col
  chunk_end_col ||= start_col
  if padding && chunk_end_col < end_col
    # Append padding. This padding should not include background color.
    chunk << "\e[0m" if has_csi
    chunk << ' ' * (end_col - chunk_end_col)
    chunk_end_col = end_col
  end
  [chunk, chunk_start_col, chunk_end_col - chunk_start_col]
end

# File reline/unicode.rb, line 174
def self.take_range(str, start_col, max_width)
  take_mbchar_range(str, start_col, max_width).first
end

# File reline/unicode.rb, line 641
def self.vi_backward_word(line, byte_pointer)
  width = 0
  byte_size = 0
  while 0 < (byte_pointer - byte_size)
    size = get_prev_mbchar_size(line, byte_pointer - byte_size)
    mbchar = line.byteslice(byte_pointer - byte_size - size, size)
    if mbchar =~ /\S/
      if mbchar =~ /\w/
        started_by = :word
      else
        started_by = :non_word_printable
      end
      break
    end
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  while 0 < (byte_pointer - byte_size)
    size = get_prev_mbchar_size(line, byte_pointer - byte_size)
    mbchar = line.byteslice(byte_pointer - byte_size - size, size)
    case started_by
    when :word
      break if mbchar =~ /\W/
    when :non_word_printable
      break if mbchar =~ /[\w\s]/
    end
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [byte_size, width]
end

# File reline/unicode.rb, line 503
def self.vi_big_backward_word(line, byte_pointer)
  width = 0
  byte_size = 0
  while 0 < (byte_pointer - byte_size)
    size = get_prev_mbchar_size(line, byte_pointer - byte_size)
    mbchar = line.byteslice(byte_pointer - byte_size - size, size)
    break if mbchar =~ /\S/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  while 0 < (byte_pointer - byte_size)
    size = get_prev_mbchar_size(line, byte_pointer - byte_size)
    mbchar = line.byteslice(byte_pointer - byte_size - size, size)
    break if mbchar =~ /\s/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [byte_size, width]
end

# File reline/unicode.rb, line 473
def self.vi_big_forward_end_word(line, byte_pointer)
  if (line.bytesize - 1) > byte_pointer
    size = get_next_mbchar_size(line, byte_pointer)
    mbchar = line.byteslice(byte_pointer, size)
    width = get_mbchar_width(mbchar)
    byte_size = size
  else
    return [0, 0]
  end
  while (line.bytesize - 1) > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    break if mbchar =~ /\S/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  prev_width = width
  prev_byte_size = byte_size
  while line.bytesize > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    break if mbchar =~ /\s/
    prev_width = width
    prev_byte_size = byte_size
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [prev_byte_size, prev_width]
end

# File reline/unicode.rb, line 453
def self.vi_big_forward_word(line, byte_pointer)
  width = 0
  byte_size = 0
  while (line.bytesize - 1) > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    break if mbchar =~ /\s/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  while (line.bytesize - 1) > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    break if mbchar =~ /\S/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [byte_size, width]
end

# File reline/unicode.rb, line 673
def self.vi_first_print(line)
  width = 0
  byte_size = 0
  while (line.bytesize - 1) > byte_size
    size = get_next_mbchar_size(line, byte_size)
    mbchar = line.byteslice(byte_size, size)
    if mbchar =~ /\S/
      break
    end
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [byte_size, width]
end

# File reline/unicode.rb, line 564
def self.vi_forward_end_word(line, byte_pointer)
  if (line.bytesize - 1) > byte_pointer
    size = get_next_mbchar_size(line, byte_pointer)
    mbchar = line.byteslice(byte_pointer, size)
    if mbchar =~ /\w/
      started_by = :word
    elsif mbchar =~ /\s/
      started_by = :space
    else
      started_by = :non_word_printable
    end
    width = get_mbchar_width(mbchar)
    byte_size = size
  else
    return [0, 0]
  end
  if (line.bytesize - 1) > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    if mbchar =~ /\w/
      second = :word
    elsif mbchar =~ /\s/
      second = :space
    else
      second = :non_word_printable
    end
    second_width = get_mbchar_width(mbchar)
    second_byte_size = size
  else
    return [byte_size, width]
  end
  if second == :space
    width += second_width
    byte_size += second_byte_size
    while (line.bytesize - 1) > (byte_pointer + byte_size)
      size = get_next_mbchar_size(line, byte_pointer + byte_size)
      mbchar = line.byteslice(byte_pointer + byte_size, size)
      if mbchar =~ /\S/
        if mbchar =~ /\w/
          started_by = :word
        else
          started_by = :non_word_printable
        end
        break
      end
      width += get_mbchar_width(mbchar)
      byte_size += size
    end
  else
    case [started_by, second]
    when [:word, :non_word_printable], [:non_word_printable, :word]
      started_by = second
    else
      width += second_width
      byte_size += second_byte_size
      started_by = second
    end
  end
  prev_width = width
  prev_byte_size = byte_size
  while line.bytesize > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    case started_by
    when :word
      break if mbchar =~ /\W/
    when :non_word_printable
      break if mbchar =~ /[\w\s]/
    end
    prev_width = width
    prev_byte_size = byte_size
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [prev_byte_size, prev_width]
end

# File reline/unicode.rb, line 523
def self.vi_forward_word(line, byte_pointer, drop_terminate_spaces = false)
  if line.bytesize > byte_pointer
    size = get_next_mbchar_size(line, byte_pointer)
    mbchar = line.byteslice(byte_pointer, size)
    if mbchar =~ /\w/
      started_by = :word
    elsif mbchar =~ /\s/
      started_by = :space
    else
      started_by = :non_word_printable
    end
    width = get_mbchar_width(mbchar)
    byte_size = size
  else
    return [0, 0]
  end
  while line.bytesize > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    case started_by
    when :word
      break if mbchar =~ /\W/
    when :space
      break if mbchar =~ /\S/
    when :non_word_printable
      break if mbchar =~ /\w|\s/
    end
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  return [byte_size, width] if drop_terminate_spaces
  while line.bytesize > (byte_pointer + byte_size)
    size = get_next_mbchar_size(line, byte_pointer + byte_size)
    mbchar = line.byteslice(byte_pointer + byte_size, size)
    break if mbchar =~ /\S/
    width += get_mbchar_width(mbchar)
    byte_size += size
  end
  [byte_size, width]
end