哪些库将使用PHP解析DTD [英] What libraries will parse a DTD using PHP

问题描述

我需要使用PHP解析DTD，并希望有一个简单库来提供帮助.每个DTD都有许多<!ENTITY...和<!-- Comment...元素，我需要对其进行操作.

I need to parse DTDs using PHP and am hoping there's a simple library to help out. Each DTD has numerous <!ENTITY... and <!-- Comment... elements, which I need to act upon.

请注意，我不需要针对这些DTD进行任何验证，只需将它们解析为数据文件本身即可.

Note that I do not need to validate anything against these DTDs, simply parse them as data files themselves.

我看过的一些选项:

詹姆斯·克拉克的SD ，这是不得已的选择，但我想避免构建/安装/配置PHP外部代码的复杂性.我不确定这种情况是否有可能.

James Clarke's SD, which is an option of last resort, but I'd like to avoid the complexity of building/installing/configuring code external to PHP. I'm not sure it's even possible in my situation.

PEAR具有 XML_DTD_Parser ，它需要安装/配置PEAR和许多pear模块，我也不确定是否可以，并且宁愿避免.有没有人成功使用它? 编辑:从那以后，我了解到XML_DTD_Parser会丢弃注释，因此这不是满足我需要的有效选项.

PEAR has an XML_DTD_Parser, which requires installing/configuring PEAR and a number of pear modules, which I'm also not sure is possible, and would rather avoid. Has anyone used it with success? I've since learned that XML_DTD_Parser discards comments, so is not a valid option for my needs.

PHP XML类具有class_path_parser，另一个站点建议使用该类，但是它无法读取ENTITY元素.它似乎正在使用PHP的内置XML解析功能，该功能使用EXPAT.

PHP XML Classes has the class_path_parser, which another site suggested, but it fails to read ENTITY elements. It appears to be using PHP's built in XML parsing capabilities, which use EXPAT.

PHP的 DOMDocument将针对DTD进行验证，因此必须能够读取它们，尽管我乍看之下看不到如何直接使用DTD解析器.

PHP's DOMDocument will validate against a DTD, so must be able to read them, though I don't see how to get at the DTD parser directly at first glance.

推荐答案

PHP的标准XML解析器都没有访问 general 实体*的权限，很少有访问注释的权限. PHP内置 XML解析器使用 PHP错误来添加.

None of the standard XML parsers for PHP give access to general entities*, and few give access to comments. PHP's built in XML Parser uses Expat, but does not expose the full expat API; in particular, a handler for entities cannot be set. There is a PHP bug filed to add this.

AFAICT，在DTD解析器中处理注释和一般实体的唯一方法是编写自己的解析器；可以手动操作，也可以使用可用于php的词法分析器和解析器生成器之一(例如 PHP_LexerGenerator 和 PHP_ParserGenerator 等.

AFAICT, the only way to handle comments and general entities in a DTD parser is to write your own parser; either by hand, or using one of the lexers and parser generators available for php (e.g. PHP_LexerGenerator and PHP_ParserGenerator among others).

*  PHP的expat包装器(XML Parser)确实提供了对符号声明的访问，这些符号声明与通用实体相似，但不相同.

* PHP's expat wrapper (XML Parser) does give access to notation declarations, which are similar to, but not the same as general entities.

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