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tree-sitter-scala 0.26.2

2026-08-08 / scala

Hi everyone. On behalf of the tree-sitter-scala project, I am happy to announce tree-sitter-scala 0.26.2. The first two segments of the version number comes from the tree-sitter-cli that was used to generate the parser, and the last segment is our actual version number. For example, tree-sitter-scala 0.26.2 uses tree-sitter 0.26.x.

About tree-sitter-scala

tree-sitter-scala is a Scala parser in C language, generated using Tree-sitter CLI, and conforming to the Tree-sitter API. Tree-sitter parsers are generally fast, incremental, and robust (ok with partial errors). We publish Rust binding to crates.io.

Tree-sitter parsers are adopted by editors like NeoVim, Emacs, Helix, Zed, and Scastie to provide language features like syntax highlight, folding, and more (supposedly part of GitHub.com).

Highlights

feat: Capture checking syntax by @exoego in #629
feat: XML literals and XML patterns by @exoego in #606
feat: Binary integer literals by @exoego in #608
feat: Wildcard in self type by @susliko in #521
feat: Reserved keywords by @iigaz in #537
feat: Infix operator precedence and associativity per SLS 6.12.3 by @exoego in #603
perf: Cuts parse time by a third by @exoego in #607
fix: Fixes self types with empty bodies, empty-bodied lambdas, enum self types by @exoego in #551
fix: Fixes soft keyword extension and Scala 3 keywords in import paths by @exoego in #573

Full release notes are at https://github.com/tree-sitter/tree-sitter-scala/releases/tag/v0.26.2.

Parsing improvements

Parsing % for Scala 2 library, Scala 2 compiler, Scala 3 compiler, and Lichess are as follows:

tree-sitter-scala	scala-library	scalac	Dotty	Lichess
`0.26.2`	`100%`	`100%`	`100%`	`100%`
`0.26.0`	`100%`	`99%`	`93%`	`98%`
`0.25.0`	`100%`	`96%`	`83%`	`92%`
`0.24.0`	`100%`	`96%`	`83%`	`84%`
`0.23.0`	`100%`	`96%`	`83%`	`84%`
`0.22.0`	`100%`	`97%`	`85%`	_
`0.21.0`	`100%`	`96%`	`85%`	_
`0.20.2`	`100%`	`96%`	`84%`	_
`0.20.1`	`98%`	`93%`	`83%`	_
`0.20.0`	`89%`	`68%`	`66%`	_

0.26.2 offers significant improvement of both Scala 2 and Scala 3 parsing accuracy. 0.26.2 parses both Scala 2 and Scala 3 compiler code bases 100%.

Participation

tree-sitter-scala 0.26.0 was brought to you by 6 contributors:

$ git shortlog -sn --no-merges v0.26.0...
    79  TATSUNO “Taz” Yasuhiro
    28  GitHub
     9  Vasili Markoukin
     4  Eugene Yokota
     2  Ilnar Gazizov
     2  Vasil Markoukin
     1  orbisai0security

Thanks to everyone who’s helped improve tree-sitter-scala by using them, reporting bugs, improving our documentation, and submitting and reviewing pull requests.

FYI - Scala Days talk by Anton

In August 2025, Tree-Sitter Scala co-maintainer Anton Sviridov gave a Tree Sitter + multi-platform talk at Scala Days. Check out Indoor Vivants for the links to code, slides, and the recording.