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(阿拉伯语) 而且我看到每个阿拉伯数字都有2个Unicode代码点. 例如，将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0到9的阿拉伯数字索引值，而U + 06F0 .. U + 06F9是0到9的扩展阿拉伯数字值.

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(当前版本为5.2，但设置后这些内容并没有太大变化)，U + 066n系列字形被标记为阿拉伯-印度数字"，而U + 06Fn系列字形被标记为被标记为东部阿拉伯语-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-波斯语和乌尔都语中的不同字形"
• U + 06F5-波斯语和乌尔都语具有与阿拉伯语不同的字形"
• U + 06F6-'波斯字形与阿拉伯字不同'
• U + 06F7-乌尔都语字形不同于阿拉伯语"

为进行比较:

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

或者，通过将信息制成标题来进行放大:

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

(是否可以看到其中的任何一个，以及它们之间的区别有多清晰，可能取决于您的浏览器和计算机上安装的字体以及其他内容.我可以清楚地看到4和6的区别； 5看起来很多两者都一样.)

(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，如果您正在使用中东的阿拉伯语，请使用U + 066n系列数字；如果您使用的是波斯语或乌尔都语，请使用U + 06Fn系列数字.作为Unicode应用程序，您应该接受其中一组代码作为有效数字(但是您可能会对混合了两组数字的序列存有疑问-或者您可能会独自呆着).

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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