Ruby 1.9:我如何正确地大写 &小写多字节字符串? [英] Ruby 1.9: how can I properly upcase & downcase multibyte strings?

问题描述

因此 matz 决定在 ruby​​ 1.9.1 中将 upcase 和 downcase 限制为 /[AZ]/i.>

ActiveSupport::Multibyte 长期以来一直通过 String#mb_chars 在 ruby​​ 1.8.x 中进行出色的 i18n 案例抖动.

但是，在 ruby​​ 1.9.1 下尝试时，它似乎不起作用.这是我编写的一个简单的测试脚本，以及我得到的输出:

$ cat test.rb# 编码:UTF-8puts("@ #{RUBY_VERSION} " + (__ENCODING__ rescue $KCODE).to_s)sd, su = "Iñtërnâtiônàlizætiøn", "IÑTËRNÂTIÔNÀLIZÆTIØN"def ps(u, d, k);puts "%-30s: %24s/%-24s" % [k, u, d] 结束ps sd.upcase, su.downcase, "普通红宝石"需要红宝石"；需要'active_support'ps sd.upcase, su.downcase, "使用 active_support"ps sd.mb_chars.upcase.to_s, su.mb_chars.downcase.to_s, 使用 active_support mb_chars"$ ruby​​ -KU test.rb@ 1.8.7 UTF8普通红宝石 : IñTëRNâTIôNàLIZæTIøN/iÑtËrnÂtiÔnÀlizÆtiØn使用 active_support : IñTëRNâTIôNàLIZæTIøN/iÑtËrnÂtiÔnÀlizÆtiØn使用 active_support mb_chars : IÑTËRNÂTIÔNÀLIZÆTIØN/iñtërnâtiônàlizætiøn$ ruby​​1.9 test.rb@ 1.9.1 UTF-8普通红宝石 : IñTëRNâTIôNàLIZæTIøN/iÑtËrnÂtiÔnÀlizÆtiØn使用 active_support : IñTëRNâTIôNàLIZæTIøN/iÑtËrnÂtiÔnÀlizÆtiØn使用 active_support mb_chars : IñTëRNâTIôNàLIZæTIøN/iÑtËrnÂtiÔnÀlizÆtiØn

那么，如何使用 ruby​​ 1.9.1 获得国际化的 upcase 和 downcase?

更新

我应该补充一点，我还使用当前 master、2-3-* 和 3-0-unstable 导轨的 ActiveSupport 进行了测试GitHub 上的分支.相同的结果.

解决方案

大小写转换取决于区域设置，并不总是往返，这就是 Ruby 1.9 没有涵盖它的原因(请参阅 这里 和 这里)

unicode-util gem 应该可以满足您的需求.

So matz made the decision to keep upcase and downcase limited to /[A-Z]/i in ruby 1.9.1.

ActiveSupport::Multibyte has long had great i18n case jiggering in ruby 1.8.x via String#mb_chars.

However, when tried under ruby 1.9.1, it doesn't seem to work. Here's a simple test script I wrote, along with the output I'm getting:

$ cat test.rb
# encoding: UTF-8

puts("@ #{RUBY_VERSION} " + (__ENCODING__ rescue $KCODE).to_s)
sd, su = "Iñtërnâtiônàlizætiøn", "IÑTËRNÂTIÔNÀLIZÆTIØN"
def ps(u, d, k); puts "%-30s:  %24s / %-24s" % [k, u, d] end
ps sd.upcase, su.downcase, "Plain ruby"

require 'rubygems'; require 'active_support'
ps sd.upcase, su.downcase, "With active_support"
ps sd.mb_chars.upcase.to_s, su.mb_chars.downcase.to_s, "With active_support mb_chars"

$ ruby -KU test.rb
@ 1.8.7 UTF8
Plain ruby                    :  IñTëRNâTIôNàLIZæTIøN / iÑtËrnÂtiÔnÀlizÆtiØn
With active_support           :  IñTëRNâTIôNàLIZæTIøN / iÑtËrnÂtiÔnÀlizÆtiØn
With active_support mb_chars  :  IÑTËRNÂTIÔNÀLIZÆTIØN / iñtërnâtiônàlizætiøn

$ ruby1.9 test.rb
@ 1.9.1 UTF-8
Plain ruby                    :      IñTëRNâTIôNàLIZæTIøN / iÑtËrnÂtiÔnÀlizÆtiØn
With active_support           :      IñTëRNâTIôNàLIZæTIøN / iÑtËrnÂtiÔnÀlizÆtiØn
With active_support mb_chars  :      IñTëRNâTIôNàLIZæTIøN / iÑtËrnÂtiÔnÀlizÆtiØn

So, how do I get internationalized upcase and downcase with ruby 1.9.1?

update

I should add that I also tested with ActiveSupport from the current master, 2-3-* and 3-0-unstable rails branches at GitHub. Same results.

解决方案

Case conversion is locale dependent and doesn't always round-trip, which is why Ruby 1.9 doesn't cover it (see here and here)

The unicode-util gem should address your needs.

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