Teaching Domain Specific Languages in Scala

on YouTube ↗41m

" summary

Course-style report on teaching DSLs using Scala 3 that shows concrete tools, assignments and outcomes: covers external DSLs with parser combinators (Parsley/parboiled discussion), internal DSLs via extension methods, symbolic operators and fluent builders, and Scala 3 metaprogramming using quotes/splices to generate compile‑time checks (examples: four‑letter command literals, duplicate initial‑state errors). Students implement parser+semantic model, optional generative macros, and VS Code integration via Scala.js for VS Code extensions (breadcrumbs, rename, go‑to, code lenses). Expect demos, library choices, and one or two high‑effort student projects per year.

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" chapters (27)

1. 0:00Introduction
2. 1:25What are DSLs
3. 2:51External DSLs and workbenches
4. 3:55Focus on internal DSLs in Scala
5. 5:42Teaching Scala via domain modeling
6. 7:08Security system domain model
7. 9:57Semantic models in Scala
8. 11:04External DSLs with combinators
9. 12:28Parsing DSL syntax and semantics
10. 14:15Advanced Scala features
11. 15:41Internal DSLs and fluent APIs
12. 16:22Operator overloading and extensions
13. 18:11Builder patterns and fluency
14. 19:16Call-by-name and guards
15. 20:39Contextual abstractions
16. 22:47Generative DSLs and metaprogramming
17. 24:10Macros for compile-time DSLs
18. 26:19Rewriting syntax to semantic model
19. 28:50Type-dependent assertions
20. 30:39Type providers for DSLs
21. 32:29Advanced assertion DSL
22. 33:11IDE support for external DSLs
23. 35:03Scala.js with VS Code
24. 37:13Language features in VS Code
25. 38:41Summary and synergies
26. 39:43Limitations and future
27. 40:45Q&A

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