module RuboCop::Cop::RangeHelp

def add_range(range1, range2)
  range1.with(
    begin_pos: [range1.begin_pos, range2.begin_pos].min,
    end_pos: [range1.end_pos, range2.end_pos].max
  )
end

def arguments_range(node)
  node.first_argument.source_range.join(node.last_argument.source_range)
end

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

def contents_range(node)
  range_between(node.loc.begin.end_pos, node.loc.end.begin_pos)
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, continuations, newlines, whitespace)
  pos = move_pos(src, pos, increment, true, /[ \t]/)
  pos = move_pos_str(src, pos, increment, continuations, "\\\n")
  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 && regexp.match?(src[pos + offset])
  pos.negative? ? 0 : pos
end

def move_pos_str(src, pos, step, condition, needle)
  size = needle.length
  offset = step == -1 ? -size : 0
  pos += size * step while condition && src[pos + offset, size] == needle
  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_comments(node)
  ranges = [node, *@processed_source.ast_with_comments[node]].map(&:source_range)
  ranges.reduce do |result, range|
    add_range(result, range)
  end
end

def range_with_comments_and_lines(node)
  range_by_whole_lines(range_with_comments(node), include_final_newline: true)
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_positional = NOT_GIVEN, # rubocop:disable Metrics/ParameterLists
                                 range: NOT_GIVEN, side: :both, newlines: true,
                                 whitespace: false, continuations: false,
                                 buffer: @processed_source.buffer)
  range = range_positional unless range_positional == NOT_GIVEN
  src = buffer.source
  go_left, go_right = directions(side)
  begin_pos = range.begin_pos
  begin_pos = final_pos(src, begin_pos, -1, continuations, newlines, whitespace) if go_left
  end_pos = range.end_pos
  end_pos = final_pos(src, end_pos, 1, continuations, 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