WIP: Fix handling of right angle bracket (`>`) in attributes

[andyw8]

This is the fix suggested by @jon-sully in https://github.com/threedaymonk/htmlbeautifier/issues/78#issuecomment-2369219951

It may need further work and verification, so I'm only opening it as a draft for now to allow for discussion.

Also, it breaks one of the current tests: HtmlBeautifier indents general self-closing tags

[phyzical]

i couldnt really come up with a more clever regex but testing in regex101 the following still matched,

%r{ (?:<%.*?%>|(?:[^"]*?->[^"]*?)|[^>])* }mx

its a bit dumber but just allows > within quotes

Hmm actually it lead me to adjust it once more to the following

%r{ (?:[^"]?[-%]>[^"]?|[^>])* }mx

moved the erb tag or - check together [-%]

im not sure if this is correct but, ill fork sometime next week and see for myself

[phyzical]

So i gave it a try, neither of my queries were perfect %r{ (?:[^"]?[-%]>[^"]?|[^>])* }mx is close.. but it breaks it "stays indented within <details> with Boolean attribute handled by ERB" do

@andyw8 i did notice if your revert all tests will pass, was this change intentional?

[andyw8]

It was copied from https://github.com/threedaymonk/htmlbeautifier/issues/78#issuecomment-2369219951 but I haven't yet looked into it.