将 unicode 字符转换为小写的标准算法是什么？
我想知道 unicode.org 提出的将 unicode 字符转换为小写的标准算法。
另外，大多数编程语言都遵循这个提议的标准吗？
I want to know the standard algorithm for converting unicode characters into lowercase as proposed by unicode.org.
Also, do most programming languages follow this proposed standard?
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基本算法只是连接每个单独字符的小写字母（由 UnicodeData 中的倒数第二列定义）。 txt）。还有一些特殊规则来处理多字符映射（Ç → i̇ 带有额外的组合 i 上方的点）、条件映射（词尾有 Σ → ς，否则为 σ）以及语言敏感规则（如土耳其语无点 ı）。
Java 确实如此。 Python 实现了基本规则，但没有实现特殊规则。而且 C 根本没有标准化的 Unicode 支持。
The basic algorithm is simply to concatenate the lowercase of each individual character (as defined by the penultimate column in UnicodeData.txt). There are also some special rules to handle multiple-character mappings (İ → i̇ with an extra COMBINING DOT ABOVE the i), conditional mappings (Σ → ς at the end of a word, but σ otherwise), and language-sensitive rules (like Turkish dotless ı).
Java does. Python implements the basic rules, but not the special rules. And C has no standardized Unicode support at all.
.NET 确实支持 unicode，并提供了在大小写之间切换的内置函数。对于其他一些语言来说可能也是如此。
.NET does have unicode support and offers built-in functions to switch between upper and lower case. This is probably true with some other languages, as well.
编程语言对 unicode 的支持程度各不相同。大多数没有 unicode 字符作为内置类型。通常，它要么在库中处理，要么通过操作系统调用处理。
例如，C++ 没有本机 unicode 字符类型，但在 stl 中具有语言环境支持（它被定义为语言的一部分）。 Ada 确实有一个本机类型 Wide_Character，以及用于操作它的库支持。
Programming languages vary in how well they support unicode. Most do not have unicode characters as a built-in type. Typically it is either handled in a library, or by OS calls.
For instance, C++ doesn't have a native unicode character type, but does have locale support in the stl (which is defined as part of the language). Ada does have a native type Wide_Character, as well as library support for manipulating it.