Ruby 1.9.2：irb 抛出 ArgumentError：输入德语变音符号时 UTF-8 中的字节序列无效
我想在我的 irb 中输入德语变音符号，但出现奇怪的错误。我可以毫无问题地输入 äöü 的任何字符，但是每个 äÖÜß 都会导致以下错误：
$ irb
ruby-1.9.2-p136 :001 > ? # here I entered Ü but it displays only ?
/Users/lorenz/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/irb/ruby-lex.rb:728:in
`block in lex_int2': invalid byte sequence in UTF-8 (ArgumentError)
我已经查看了很多有关 Ruby、rvm 和 UTF 的问题-8 但没有任何帮助。大多数都与 Rails 或数据库配置相关。我专门检查了以下内容：
locale 设置正确
$ locale
LANG="de_DE.UTF-8"
LC_COLLATE="de_DE.UTF-8"
LC_CTYPE="de_DE.UTF-8"
LC_MESSAGES="de_DE.UTF-8"
LC_MONETARY="de_DE.UTF-8"
LC_NUMERIC="de_DE.UTF-8"
LC_TIME="de_DE.UTF-8"
LC_ALL="de_DE.UTF-8"
Terminal.app 设置为 Unicode (UTF-8) 并且 Encoding.default_external 设置正确：
$ irb
ruby-1.9.2-p136 :001 > Encoding.default_external
=> #<Encoding:UTF-8>
为什么这在 Ruby 中仍然如此困难？
I want to enter German Umlauts in my irb but get a weird error. I can enter any character of äöü without problems, but each of ÄÖÜß leads to the following error:
$ irb
ruby-1.9.2-p136 :001 > ? # here I entered Ü but it displays only ?
/Users/lorenz/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/irb/ruby-lex.rb:728:in
`block in lex_int2': invalid byte sequence in UTF-8 (ArgumentError)
I have looked at a lot of SO questions regarding Ruby, rvm, and UTF-8 but none helped. Most are tied to rails or database configuration. I specifically checked the following:
locale is set correctly
$ locale
LANG="de_DE.UTF-8"
LC_COLLATE="de_DE.UTF-8"
LC_CTYPE="de_DE.UTF-8"
LC_MESSAGES="de_DE.UTF-8"
LC_MONETARY="de_DE.UTF-8"
LC_NUMERIC="de_DE.UTF-8"
LC_TIME="de_DE.UTF-8"
LC_ALL="de_DE.UTF-8"
Terminal.app is set to Unicode (UTF-8) and Encoding.default_external is set correctly:
$ irb
ruby-1.9.2-p136 :001 > Encoding.default_external
=> #<Encoding:UTF-8>
Why is this still so difficult in Ruby?
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通常您可以使用
#coding: UTF-8为文件设置编码。如果是 irb，可能需要提前明确设置：
irb -E UTF-8:UTF-8
这会将内部和外部编码设置为 UTF -8 在
irb上。或者另外尝试
irb -U将内部编码设置为 UTF-8。
Usually you set encoding with
# coding: UTF-8for a file.In case of
irbit might be necessary to set it in advance and explicitly:irb -E UTF-8:UTF-8This will set both internal and external encoding to UTF-8 on
irb.Or additionally try
irb -Uwhich sets the internal encoding to UTF-8.
我不知道如何解决这个问题，但可以肯定的是，这是 irb 独有的事情，我注意到很多时候 irb 有自己独特的处理用户输入的方法（它甚至可能是 readline 的限制），而且它只与某些角色配合得很好。
您可以做一个简单的测试来检查，使用以下命令创建一个新的 rb 文件
并执行它，它是否有效？
虽然这仍然是一个麻烦，但到目前为止，这对我来说还不是一个足够大的问题，不需要真正寻找解决方案。
I don't know how to solve the problem but the sure thing is this is an irb only thing, I noticed many times irb has its own unique of dealing with user's inputs (it may even well be a limitation in readline) and it only works well with some characters.
You can do a simple test to check that, create a new rb file with:
and execute it, does it works ?
While it is still a nuisance, it is not a big enough problem for me until now to bother really looking for a solution.
如果您在 Mac 操作系统上运行，则可能是读取行问题。请参阅http://henrik.nyh.se/2008/03/irb-readline .
If you're running on Mac OS, it might be a readline issue. See http://henrik.nyh.se/2008/03/irb-readline .