Improved element register

[joeldrapper]

Listing registered elements

Phlex::Element classes (such as Phlex::HTML::StandardElements) now respond to registered_elements with a Concurrent::Map(method_name => Symbol, tag => String) of all their registered elements.

Checking if a method is a registered element

Phlex::SGML classes (Phlex::HTML and Phlex::SGML) now also respond to registered_element?(method_name => Symbol) => bool. This works by looking up the method and asking its owner if it's a registered element.

Note: this second method is part of Phlex’ private API.

[joeldrapper]

@marcoroth the registered_elements method should be a lot better than slow_registered_elements as it includes the tag name as well as the method name.

[marcoroth]

Nice, thank you!

[marcoroth]

I just updated phlexing to use 1.6.1 in marcoroth/phlexing@8ff882e in order to make use of this method. Works flawlessly, thank you!