[openstreetmap/openstreetmap-website] Auto-linkify markdown text (Issue #7122)

[Pablo Brasero]

pablobm left a comment (openstreetmap/openstreetmap-website#7122)

Idea: perhaps we can use a stream HTML parser, avoiding the linkification when we are inside an inappropriate element. Something like this:

```
UNLINKABLE_ELEMENTS = ["pre", "code", "a"]

unlinkable_elements_stack = []

parser = StreamingParser.new(html) do |events|
  events.on_opening_element do |element|
    unlinkable_elements_stag.push(element.tag_name) if UNLINKABLE_ELEMENTS.include?(element.tag_name)
  end
  
  events.on_closing_element do |element|
    element.text = linkify(text) if inappropriate_elements_stack.empty?
    
    unlinkable_elements_stag.pop if UNLINKABLE_ELEMENTS.include?(element.tag_name)
  end
end

parser.run
```

I'm totally making up the API above. Nokogiri has something like it, but I don't remember the detail now. LibXML probably has it too.

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