module RuboCop::Cop::RangeHelp

def column_offset_between(base_range, range)
  effective_column(base_range) - effective_column(range)
end

def directions(side)
  if side == :both
    [true, true]
  else
    [side == :left, side == :right]
  end
end

def effective_column(range)
  if range.line == 1 &&
     @processed_source.raw_source.codepoints.first == BYTE_ORDER_MARK
    range.column - 1
  else
    range.column
  end
end

def final_pos(src, pos, increment, newlines, whitespace)
  pos = move_pos(src, pos, increment, true, /[ \t]/)
  pos = move_pos(src, pos, increment, newlines, /\n/)
  move_pos(src, pos, increment, whitespace, /\s/)
end

def move_pos(src, pos, step, condition, regexp)
  offset = step == -1 ? -1 : 0
  pos += step while condition && src[pos + offset] =~ regexp
  pos.negative? ? 0 : pos
end

def range_between(start_pos, end_pos)
  Parser::Source::Range.new(processed_source.buffer, start_pos, end_pos)
end

def range_by_whole_lines(range, include_final_newline: false)
  buffer = @processed_source.buffer
  last_line = buffer.source_line(range.last_line)
  end_offset = last_line.length - range.last_column
  end_offset += 1 if include_final_newline
  range
    .adjust(begin_pos: -range.column, end_pos: end_offset)
    .intersect(buffer.source_range)
end

def range_with_surrounding_comma(range, side = :both)
  buffer = @processed_source.buffer
  src = buffer.source
  go_left, go_right = directions(side)
  begin_pos = range.begin_pos
  end_pos = range.end_pos
  begin_pos = move_pos(src, begin_pos, -1, go_left, /,/)
  end_pos = move_pos(src, end_pos, 1, go_right, /,/)
  Parser::Source::Range.new(buffer, begin_pos, end_pos)
end

def range_with_surrounding_space(range:, side: :both,
                                 newlines: true, whitespace: false)
  buffer = @processed_source.buffer
  src = buffer.source
  go_left, go_right = directions(side)
  begin_pos = range.begin_pos
  if go_left
    begin_pos =
      final_pos(src, begin_pos, -1, newlines, whitespace)
  end
  end_pos = range.end_pos
  end_pos = final_pos(src, end_pos, 1, newlines, whitespace) if go_right
  Parser::Source::Range.new(buffer, begin_pos, end_pos)
end

def source_range(source_buffer, line_number, column, length = 1)
  if column.is_a?(Range)
    column_index = column.begin
    length = column.size
  else
    column_index = column
  end
  line_begin_pos = if line_number.zero?
                     0
                   else
                     source_buffer.line_range(line_number).begin_pos
                   end
  begin_pos = line_begin_pos + column_index
  end_pos = begin_pos + length
  Parser::Source::Range.new(source_buffer, begin_pos, end_pos)
end