[ruby-core:104448] [Ruby master Feature#17992] Upstreaming the htmlentities gem into CGI#.(un)escape_html

Issue #17992 has been updated by duerst (Martin Dst).


It is difficult to make this complete without overdoing it because there are many different kinds of entity sets. The htmlentities gem distinguishes three (html4, xhtml1, and expanded). Both html4 and xhtml1 come in at around 250 entities; expanded is around 1000. But it doesn't include the html5 set, which seems to be even bigger (https://html.spec.whatwg.org/entities.json contains 2231 entries, although some of them are duplicates (with and without semicolon)). It is highly unclear what the correct set would be if we expand the coverage of CGI.escapeHTML and friends.

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Feature #17992: Upstreaming the htmlentities gem into CGI#.(un)escape_html
https://bugs.ruby-lang.org/issues/17992#change-92701

* Author: AMomchilov (Alexander Momchilov)
* Status: Feedback
* Priority: Normal
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Hi there,

I was looking to unescape some HTML entities in a String, and I discovered that `CGI#.(un)escape_html` is **really** limited. Many StackOverflow questions share a similar disappointment, and point users to using the [htmlentities gem](https://github.com/threedaymonk/htmlentities):

1. https://stackoverflow.com/a/383561/3141234
2. https://stackoverflow.com/a/22926384/3141234

This solved my problem, but I feel like something this standard/universal should be built-in. To that end, I'm interested in working on merging the htmlentities gem into CGI's repo. Would this be a welcome change?

* I've e-mailed the author (Paul Battley) privately, and got his blessing to do so.
* It's MIT licensed, so that should be OK.




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