Use directory as layout structure

[giautm]

Consider another approach for layout structure: https://docs.expo.dev/router/layouts Instead of parsing the marker at beginning of files

app
 _layout.html
 home
  _layout.html
  index.html

[cnlangzi]

Xun's Page Router is inspired by Nextjs's Page Router. It is same as expo's as you mentioned. But there are 3 problems.

• directory is used in layout setup and routing
• override layout issue on page level
• layout might be mixed when host precedence is there.

re 1st, he has to keep an eye on directory when developers define their API routing. Because there is a directory limitation on its html viewer from Page Router.
re 2nd, a workaround is required.
re 3rd, a workaround is required too.

In Xun's design pattern, Handler Routing is a first-class citizen. Developers should feel free to define their API routing, with the Page Router following suit as merely an HTML viewer.

This is why the <!--layout:xx--> marker is introduced, allowing developers the freedom to apply any pattern to their APIs.