Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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Playing with contextual links between abstract syntax definitions and usagepic.twitter.com/U53wmrW4XK
Trying to visually represent the hierarchy of a parse tree, as well as support disambiguation. For example, if you have "1 + 2" and you click on "1", you could either show "1 is a number" or "1 + 2 is a binary op". Anyone have good refs for similar visualizations?pic.twitter.com/GEU7I9j3sY
Not a huge fan of this approach b/c it requires careful mouse positioning in the gutters to select an outer object instead of an inner one. But it's less of a change than e.g. replacing the string with a node-link tree diagram.
An alternative might be to always diagram the entire syntax object? For example this is @drewmikehead's equation diagram from https://chi2021demo.scholarphi.org/ . This also uses increasingly dark background colors to represent hierarchy without modifying space.pic.twitter.com/6tqTmKSIHQ
Current best idea: color effects on hover by default, then a toggleable x-ray mode which adds padding+borders to show the syntax tree more clearly (but changes document layout).pic.twitter.com/kX2dFaPOxH
Cool! I've definitely wondered if you could make CS Metanotation easier on digital devices.
I've also wondered is you could somehow render nonterminal vs terminal symbols in a different way, eg. rendering nonterminals in a 'well' to show that they need to be filled in… 
The Swift reference doesn't use a 'dimensional' rendering style like I was imagining, but it does use 'pills' for missing bits of code, which is neat: https://docs.swift.org/swift-book/ReferenceManual/Statements.html …pic.twitter.com/iEj71Nqcsu
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