add_by_io

# File railties/lib/rails/code_statistics_calculator.rb, line 61
  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