Kolasu supplies the infrastructure to build a custom, possibly mutable, Abstract Syntax Tree (AST) using Kotlin. In particular, it can be integrated easily with ANTLR, but it can also be used on its own. Kolasu strives to be usable and idiomatic also in Java projects.
It stands for Kotlin Language Support.
Kolasu is part of the StarLasu set of libraries. The other libraries provide similar support in other languages such as Typescript and Python.
We support JDK 8, 11, and 17. All JDKs in between should work too, but these are explicitly tested.
You can take a look at the documentation for StarLasu, as it explain the principles used in the whole set of libraries, including Kolasu: StarLasu documentation.
Kolasu has been used to implement:
- Parsers
- Editors
- Transpilers
- Code analysis tools
Extend your AST classes from Node to get these features:
- Navigation: utility methods to traverse, search, and modify the AST
- Printing: print the AST as XML, as JSON, as a parse tree
- EMF interoperability: ASTs and their metamodel can be exported to EMF
Classes can have a name, and classes can reference a name. Utilities for resolving these references are supplied.
Kolasu tries to be non-invasive and implements this functionality by introspecting the AST. All properties, and therefore the whole tree structure, will be detected automatically.
Kolasu was born as a small framework to support building languages using ANTLR and Kotlin. It evolved over the time as it was used at Strumenta as part of open-source and commercial projects for building transpilers, interpreters, compilers, and more.
Releases are published on Maven Central:
dependencies {
compile "com.strumenta.kolasu:kolasu-core:1.5.0-RC5"
}
Run:
./gradlew ktlintFormat
Kolasu is used in several internal and commercial projects developed at Strumenta.
To publish releases you need to set the environment variables GPR_USER and GPR_API_KEY.