ASDL is around here for a long time, and it was showed as raw text on documentation (under library/ast), IMHO it would be great to highlight it.

+1

New changeset d60040ba226bd2e3b6f58d074015aa2499dc1cb8 by Batuhan Taskaya in branch 'master':
bpo-40517: Implement syntax highlighting support for ASDL (#19928)
https://github.com/python/cpython/commit/d60040ba226bd2e3b6f58d074015aa2499dc1cb8

New changeset eff870b618ca6f6b7a60a271f15af7e54b8a1b97 by Raymond Hettinger in branch 'master':
Revert "bpo-40517: Implement syntax highlighting support for ASDL (#19928)" (#19950)
https://github.com/python/cpython/commit/eff870b618ca6f6b7a60a271f15af7e54b8a1b97

I really like this idea but it needs different styling.  Attaching a screen shot will significant readability and beauty issues.

Suggest:
* Boldfacethe class names (Module, Interactive, etc)
* Unboldface the fields names (body, types_ignores, argtypes, etc)
* The tinted grape color does not work well on the green background.
* Perhaps have a graphic designer take a look.

Oh, sorry for that bad look :/ I just want it to look consistent, let me see what I can do further (I'll probably consult a friend of mine who understand this things). By the way, I could've just adjust the values over the existing code if you didn't revert, the core logic would be same we just need to change token types.

Sorry about the commit/revert. I fat fingered a comment.  Please do resubmit the PR.  In general, this is a nice idea.  The look just needs to be tweaked a bit.

Hey Raymond, can you give me your feedback on asdl.png (the screenshot of new theme)?

The new screenshot looks nice.  The colors are much better.  Can you post another run with the class names in bold.

Unfortunately there aren't many `bold` type tokens I can use, so I had to change color of module <Python>. If you wish I can make both class names and `Python` bold, or keep it in this way.

(by the way, I did not push this change. I'll push it when you think it is ready)

I don't like the red Python in asdl2.  Just black, perhaps bold, would be better.  Also I like the darker blue in asdl.py, bold or not.  Better contrast to me from the greens.  But I agree that grape is too clashy.

Attaching 2 different styles python_bold.png (module <Python> is bold) and asdl_no_style.png (module <Python> has no style)

I tried both a laptop and desktop and slightly prefer unbolded.  How about a darker blue?

> I tried both a laptop and desktop and slightly prefer unbolded.  How about a darker blue?

Sorry but I have no control over styles. They are pre-defined, I only change the token type and pygments handles the rest of it. I dont know if such a color exists.

Thanks for producing the comparison panel.  In side-by-side views, python_bold.png looks best to me with asdl2.png as a close second.

I've found a bold dark blue, which I guess suits both your and @terry.reedy recommendations. How does bold_dark_blue.png looks?

I say merge it :)

I've updated the PR with bold_dark_blue.png changes.

New changeset b7a78ca74ab539943ab11b5c4c9cfab7f5b7ff5a by Batuhan Taskaya in branch 'master':
bpo-40517: Implement syntax highlighting support for ASDL (GH-19967)
https://github.com/python/cpython/commit/b7a78ca74ab539943ab11b5c4c9cfab7f5b7ff5a

Thanks for the contribution.  It looks much nicer than what we had before.

Thank you all for your reviews for styling, also I have to thank https://github.com/CyberSaxosTiGER for his external reviews on the color scheme.