Bug 258603 – Harmonize the hosts/domain name testing in Quirks

• Component: New Bugs
• Status: NEW

[Karl Dubost]

Currently the Quirks.cpp file has a couple of different ways of testing for the domain name of a site where the Quirk should apply. 
https://github.com/WebKit/WebKit/blame/main/Source/WebCore/page/Quirks.cpp

This is probably due to layer of history. 
It would probably be better to choose a "better"/more recent way of doing things. 

top domain equality
   equalLettersIgnoringASCIICase(host, domain)
   host == domain

partial_domain end
   host.endsWithIgnoringASCIICase(partial_domain)
   host.endsWith(partial_domain)

partial_domain start
   startsWithLettersIgnoringASCIICase(host, domain)
   host.toString()).startsWith(partial_domain)


There is also 
   topPrivatelyControlledDomain(host.toString()).startsWith("expedia."_s))


The recommended way is probably to use
   class WebCore::RegistrableDomain and its methods

see
https://github.com/WebKit/WebKit/blob/main/Source/WebCore/platform/RegistrableDomain.h
https://github.com/WebKit/WebKit/blob/main/Tools/TestWebKitAPI/Tests/WebCore/RegistrableDomain.cpp

[Radar WebKit Bug Importer]

<rdar://problem/111433802>

[Karl Dubost]

How do we improve this a bit more. 
In Bug 260938 isDomain() was created
but probably, there is a need for more generic functions.