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https://github.com/MaxDesiatov/Typology
Swift type checking and semantic analysis for developer tools
https://github.com/MaxDesiatov/Typology
developer-tools hindley-milner semantic-analysis semantic-analyzer swift type-checker type-checking type-inference type-system
Last synced: 3 months ago
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Swift type checking and semantic analysis for developer tools
- Host: GitHub
- URL: https://github.com/MaxDesiatov/Typology
- Owner: MaxDesiatov
- License: apache-2.0
- Created: 2019-04-18T18:52:33.000Z (over 5 years ago)
- Default Branch: main
- Last Pushed: 2022-03-16T11:14:19.000Z (over 2 years ago)
- Last Synced: 2024-07-05T13:46:09.408Z (4 months ago)
- Topics: developer-tools, hindley-milner, semantic-analysis, semantic-analyzer, swift, type-checker, type-checking, type-inference, type-system
- Language: Swift
- Homepage:
- Size: 186 KB
- Stars: 82
- Watchers: 6
- Forks: 5
- Open Issues: 23
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE.md
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# Typology
[](https://codecov.io/gh/maxdesiatov/Typology)
Typology is a work in progress attempt to implement type checking of Swift in Swift itself.
Currently it uses [SwiftSyntax](https://github.com/apple/swift-syntax) as a parser, but is ready
to switch to other pure Swift parsers in the future when any are available.
## Goals
- **Education**: understanding how type checking can be implemented in a Swift
compiler
- **User Experience**: finding the best way to report type errors and to improve
related developer tools
- **Research and Experimentation**: prototyping advanced features that could be
fully developed within Swift's type system.
## How does it work?
Same as [the type checker in Apple's Swift
compiler](https://github.com/apple/swift/blob/master/docs/TypeChecker.rst),
Typology relies on the fact that you can express [type
systems](https://en.m.wikipedia.org/wiki/Hindley–Milner_type_system) with a set of constraints
on types that are resolved through [unification]().
## See also
### Type systems and type checkers
- [Apple's Swift Compiler Type Checker Design and Implementation](https://github.com/apple/swift/blob/master/docs/TypeChecker.rst) by multiple contributors
- [A Type System From Scratch](https://www.youtube.com/watch?v=IbjoA5xVUq0) by [@CodaFi](https://github.com/CodaFi)
- [Write You a Haskell: Hindley-Milner Inference](http://dev.stephendiehl.com/fun/006_hindley_milner.html) by [@sdiehl](https://github.com/sdiehl)
- [Typing Haskell in Haskell](http://web.cecs.pdx.edu/~mpj/thih/TypingHaskellInHaskell.html) by [Mark P Jones](https://web.cecs.pdx.edu/~mpj/)
- [“What part of Hindley-Milner do you not understand?”](https://stackoverflow.com/questions/12532552/what-part-of-hindley-milner-do-you-not-understand) question and answers on StackOverflow
- [So you want to write a type checker...](http://languagengine.co/blog/so-you-want-to-write-a-type-checker/) by [@psygnisfive](https://github.com/psygnisfive)
- [Exponential time complexity in the Swift type checker](https://www.cocoawithlove.com/blog/2016/07/12/type-checker-issues.html) by [@mattgallagher](https://github.com/mattgallagher)
- [A Swift Playground containing Martin Grabmüller's "Algorithm W Step-by-Step"](https://gist.github.com/CodaFi/ca35a0c22fbd96eca505b5df45f2509e) by [@CodaFi](https://github.com/CodaFi)
### Error reporting
- [Compiler Errors for Humans](https://elm-lang.org/blog/compiler-errors-for-humans) on [Elm blog](https://elm-lang.org/blog)
- [Shape of errors to come in Rust compiler](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html) by [Jonathan Turner](https://github.com/jonathandturner)
### Optimizing type checker's performance for large projects
- [Apple's Swift Compiler Dependency Analysis](https://github.com/apple/swift/blob/master/docs/DependencyAnalysis.rst) by multiple contributors