Ruby 中有类似空流的东西吗？

发布于 2024-12-24 01:57:02 字数 147 浏览 1 评论 0原文

我可以在 Unix 系统上使用：

File.open('/dev/null', 'w')

，但如果有 Ruby 方法可以实现这一点，我想使用它。我只是在寻找一个 I/O 流，它会立即“丢弃”所有写入，有点像空对象。

原文

I could use:

File.open('/dev/null', 'w')

on Unix systems, but if there is a Ruby way to achieve this, I'd like to use it. I am just looking for an I/O stream, that immediately "trashes" all writes, kind of like a null-object.

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爱冒险 2024-12-31 01:57:02

如果您想要流的完整行为，最好的方法可能是使用：

File.open(File::NULL, "w")

请注意，File::NULL 是 Ruby 1.9.3 中的新增功能；你可以使用我的 backports gem：

require 'backports/1.9.3/file/null' # => Won't do anything in 1.9.3+
File.open(File::NULL, "w")          # => works even in Ruby 1.8.6

你也可以复制相关代码（如果您愿意）。

If you want the full behavior of streams, the best is probably to use:

File.open(File::NULL, "w")

Note that File::NULL is new to Ruby 1.9.3; you can use my backports gem:

require 'backports/1.9.3/file/null' # => Won't do anything in 1.9.3+
File.open(File::NULL, "w")          # => works even in Ruby 1.8.6

You could also copy the relevant code if you prefer.

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佼人 2024-12-31 01:57:02

有 stringIO，当我想引入虚拟文件流时，我发现它很有用：

require "stringio"
f = StringIO.new
f.gets # => nil

下面是来自 heckle 的一些代码，它可以找到适用于 Unix 和 Windows 的位桶，稍作修改：

# Is this platform MS Windows-like?
# Actually, I suspect the following line is not very reliable.
WINDOWS = RUBY_PLATFORM =~ /mswin/
# Path to the bit bucket.
NULL_PATH = WINDOWS ? 'NUL:' : '/dev/null'

There's stringIO, which I find useful when I want to introduce a dummy filestream:

require "stringio"
f = StringIO.new
f.gets # => nil

And here's some code from heckle that finds the bit bucket for both Unix and Windows, slightly modified:

# Is this platform MS Windows-like?
# Actually, I suspect the following line is not very reliable.
WINDOWS = RUBY_PLATFORM =~ /mswin/
# Path to the bit bucket.
NULL_PATH = WINDOWS ? 'NUL:' : '/dev/null'

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迟到的我 2024-12-31 01:57:02

不，我不相信 Ruby 中存在类似空流的东西，至少在早期版本中是这样。在这种情况下，您必须自己制作一个。根据它将调用的方法，您需要编写
空流类上的存根方法，如下所示：

class NullStream
   def <<(o); self; end
end

上面的示例绝不完整。例如，某些流可能需要调用 write、puts 或其他方法。此外，某些方法应该通过在其方法中返回 self 来实现，例如 <<，而其他方法则不然。

No, I don't believe there is anything like a null stream in Ruby, at least in earlier versions. In that case, you must make one yourself. Depending on the methods that it will call, you will need to write
stub methods on the null stream class, like this:

class NullStream
   def <<(o); self; end
end

The above example is by no means complete. For example, some streams may require calling the write, puts or other methods. Moreover, some methods should be implemented by returning self in their methods, like <<, others not.

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