Java、JavaCC：如何解析BMP之外的字符？
我指的是XML 1.1 规范。
看一下NameStartChar的定义：
NameStartChar ::= ":" | [AZ] | “_” | [阿兹] | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]
如果我正确解释这一点，最后一个范围 (#x10000-#xEFFFF) 超出了 Java 的 UTF16 范围 >char 类型。所以它一定是UTF32，对吗？因此，我需要根据此范围检查成对的 char，而不是单个 char，对吗？
我的问题是：
- 如何使用标准 Java 方法检查此类字符范围？
- 如何在 JavaCC 中定义这样的范围？
- JavaCC 抱怨
\u10000和\uEFFFF
- JavaCC 抱怨
谢谢！
注意： 别担心，我不会尝试编写自己的 XML 解析器。
编辑： 我正在编写一个解析器，它将检查来自其他（非 XML）文本格式的文本输入是否与有效的 XML 名称匹配。
I am referring to the XML 1.1 spec.
Look at the definition of NameStartChar:
NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]
If I interpret this correctly, the last range (#x10000-#xEFFFF) goes beyond the UTF16 range of Java's char type. So it must be UTF32, right? So, I need to check pairs of char against this range, instead of single chars, right?
My questions are:
- How do I check for such character ranges using standard Java methods?
- How is it possible to define such ranges in JavaCC?
- JavaCC complains about
\u10000and\uEFFFF
- JavaCC complains about
Thank you!
NOTE: Don't worry, I am not trying to write an own XML-parser.
EDIT: I am writing a parser, which would check if text input from miscellaneous (non-XML) text formats would match valid XML names.
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看一下
Character.toCodePoint(char, char)，它会将代理对转换为全范围代码点。String.codePointAt可能对您也很有用。字符和字符串中还有许多其他代理支持。要确切知道要调用哪些方法，我们需要了解您情况的具体细节。
Have a look at
Character.toCodePoint(char, char)which will convert a surrogate pair into a full range code point.String.codePointAtmay well be useful to you, too.There's a lot of other surrogate support within Character and String. To know exactly which methods to call, we'd need to know the exact details of your situation.
我发现 http://www.fileformat.info/info/unicode /char/10000/index.htm 是一个了解 Unicode 字符的便捷站点。
例如，u+10000 和 u+10FFFF 是
I've found http://www.fileformat.info/info/unicode/char/10000/index.htm to be a handy site for learning about Unicode characters.
For example, u+10000 and u+10FFFF are