在 Unicode 中，为什么阿拉伯数字有两种表示形式? [英] In Unicode, why are there two representations for the Arabic digits?

问题描述

我正在阅读 Unicode @ Wikipedia 的规范(阿拉伯 Unicode)我看到每个阿拉伯数字都有 2 个 Unicode 代码点.例如 1 定义为 U+0661 和 U+06F1.

I was reading the specification of Unicode @ Wikipedia (Arabic Unicode) and I see that each of the Arabic digits has 2 Unicode code points. For example 1 is defined as U+0661 and as U+06F1.

我应该使用哪个?

推荐答案

根据代码图表, U+0660 .. U+0669 是 ARABIC-INDIC DIGIT 值 0 到 9，而 U+06F0 .. U+06F9 是 EXTENDED ARABIC-INDIC DIGIT 值 0 到 9.

According to the code charts, U+0660 .. U+0669 are ARABIC-INDIC DIGIT values 0 through 9, while U+06F0 .. U+06F9 are EXTENDED ARABIC-INDIC DIGIT values 0 through 9.

在 Unicode 3.0 书中(5.2 是当前版本，但这些东西一旦设置就没有太大变化)，U+066n 系列字形被标记为Arabic-Indic 数字"和 U+06Fn 系列字形标有东方阿拉伯-印度数字(波斯语和乌尔都语)".它还指出:

In the Unicode 3.0 book (5.2 is the current version, but these things don't change much once set), the U+066n series of glyphs are marked 'Arabic-Indic digits' and the U+06Fn series of glyphs are marked 'Eastern Arabic-Indic digits (Persian and Urdu)'. It also notes:

• U+06F4 - '波斯语和乌尔都语的不同字形'
• U+06F5 - '波斯语和乌尔都语共享不同于阿拉伯语的字形'
• U+06F6 - '不同于阿拉伯语的波斯字形'
• U+06F7 - '与阿拉伯语不同的乌尔都语字形'

比较:

• U+066n:٠١٢٣٤٥٦٧٨٩
• U+06Fn: ۰۱۲۳۴۵۶۷۸۹

或者，通过将信息变成标题来放大:

Or, enlarged by making the information into a title:

或者:

     U+066n    U+06Fn
0      ٠         ۰
1      ١         ۱
2      ٢         ۲
3      ٣         ۳
4      ٤         ۴
5      ٥         ۵
6      ٦         ۶
7      ٧         ۷
8      ٨         ۸
9      ٩         ۹

(您是否可以看到其中任何一个，以及它们的区分程度可能取决于您的浏览器和机器上安装的字体以及其他任何东西.我可以清楚地看到 4 和 6 的区别；5 看起来很两者都一样.)

(Whether you can see any of those, and how clearly they are differentiated may depend on your browser and the fonts installed on your machine as much as anything else. I can see the difference on 4 and 6 clearly; 5 looks much the same in both.)

根据此信息，如果您使用的是来自中东的阿拉伯语，请使用 U+066n 系列数字；如果您使用波斯语或乌尔都语，请使用 U+06Fn 系列数字.作为 Unicode 应用程序，您应该接受任何一组代码作为有效数字(但您可能会对混合这两组数字的序列产生怀疑 - 或者您可能只是不理会).

Based on this information, if you are working with Arabic from the Middle East, use the U+066n series of digits; if you are working with Persian or Urdu, use the U+06Fn series of digits. As a Unicode application, you should accept either set of codes as valid digits (but you might look askance at a sequence that mixed the two sets of digits - or you might just leave well alone).

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