class CodeStatisticsCalculator

def add_by_io(io, file_type)
  patterns = PATTERNS[file_type] || {}
  comment_started = false
  while line = io.gets
    @lines += 1
    if comment_started
      if patterns[:end_block_comment] && patterns[:end_block_comment].match?(line)
        comment_started = false
      end
      next
    else
      if patterns[:begin_block_comment] && patterns[:begin_block_comment].match?(line)
        comment_started = true
        next
      end
    end
    @classes   += 1 if patterns[:class] && patterns[:class].match?(line)
    @methods   += 1 if patterns[:method] && patterns[:method].match?(line)
    if !line.match?(/^\s*$/) && (patterns[:line_comment].nil? || !line.match?(patterns[:line_comment]))
      @code_lines += 1
    end
  end
end