问题描述

在编写格式和解析引擎时，我想知道 - 给定 j.u.Locale，如果一般文本方向是从右到左(字母字符).我看到的是:

While I am writing a format and parse engine, I would like to find out - given a j.u.Locale, if the general text orientation is right-to-left (letter chars). What I have seen is:

1.) Character#getDirectionality(char) 这需要了解要解析的具体字符，由于可能存在填充字符，这并不总是容易的.

1.) Character#getDirectionality(char) This requires the knowledge of the concrete char to be parsed which is not always easy due to possible fill chars.

2.) java.awt.ComponentOrientation#getOrientation(Locale) 这个方法对我来说有两个问题.首先，我不想依赖 awt 或其他 gui 库(预计 Java 以后可能会模块化).第二个也是更重要的:这个方法在 OpenJDK 和 Android 中的实现只是使用了一种非常简单的方法，即:如果语言是 (ar, fa, iw, ur) 之一，那么方法就是 RIGHT_TO_LEFT.但是看看 Wikipedia-ISO-639 似乎有更多的语言有权利-to-left-orientation，例如 ISO-639 代码he"(希伯来语).

2.) java.awt.ComponentOrientation#getOrientation(Locale) This method has two problems for me. First I would not like to be dependent on awt or other gui libraries (anticipating a possible later modularization of Java). Second and more important: The implementation of this method in OpenJDK and Android just use a very simple approach, namely: If the language is one of (ar, fa, iw, ur) then the method says RIGHT_TO_LEFT. But looking at Wikipedia-ISO-639 it appears that there are more languages which have a right-to-left-orientation, for example the ISO-639-code 'he' (hebrew).

所以我现在的问题是，你知道更好的方法吗?目前我倾向于只使用 Wikipedia 列表，即使用更好的语言列表来改进 java.awt.ComponentOrientation 方法.

So my question now is, do you know a better approach? At the moment I tend just to use the Wikipedia list, that is, to refine the java.awt.ComponentOrientation approach with a better language list.

推荐答案

经过进一步研究，我发现语言代码'iw'只是'he'的旧形式.而表达式 new Locale("he").getLanguage() 将提供结果iw"！

After some further research I have found out that the language code 'iw' is just the old form for 'he'. And the expression new Locale("he").getLanguage() would provide the result "iw"!

尽管如此，ComponentOrientation 方法显然不是最新的，因为根据 Wikipedia，它缺少以下语言:

Nevertheless the ComponentOrientation-method is obviously not up to date, since it is missing the following languages according to Wikipedia:

yi(意第绪语加旧形式 ji)、dv(马尔代夫语)、ps(普什图语)和 ha(豪萨语)

yi (yiddish plus old form ji), dv (maldivian), ps (pashto) and ha (hausa)

所以我改进了 ComponentOrientation 的方法并添加了这些缺失的语言.最终代码如下所示:

So I have refined the approach of ComponentOrientation and added these missing languages. The final code looks like this:

private static final Set<String> RTL;

static {
  Set<String> lang = new HashSet<String>();
  lang.add("ar");
  lang.add("dv");
  lang.add("fa");
  lang.add("ha");
  lang.add("he");
  lang.add("iw");
  lang.add("ji");
  lang.add("ps");
  lang.add("sd");
  lang.add("ug");
  lang.add("ur");
  lang.add("yi");
  RTL = Collections.unmodifiableSet(lang);
}

public static boolean isTextRTL(Locale locale) {
  return RTL.contains(locale.getLanguage());
}

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