1e2d323a7c
This change is quite verbose, so a little bit of explaining: 1. To correctly format parse errors, errors must be able to return more than one annotated span (the parser returns a list of errors for each span). To accomplish this, the structure of how the `Diagnostic` struct which formats an error is constructed has changed to delegate the creation of the `SpanLabel` vector to the kind of error. 2. The rnix structures don't have human-readable output formats by default, so some verbose methods for formatting them in human-readable ways have been added in the errors module. We might want to move these out into a submodule. 3. In many cases, the errors returned by rnix are a bit strange - so while we format them with all information that is easily available they may look weird or not necessarily help users. Consider this CL only a first step in the right direction. Change-Id: Ie7dd74751af9e7ecb35d751f8b087aae5ae6e2e8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6871 Reviewed-by: sterni <sternenseemann@systemli.org> Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI |
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| .. | ||
| benches | ||
| docs | ||
| proptest-regressions/value | ||
| src | ||
| tests | ||
| .envrc | ||
| .gitignore | ||
| .skip-subtree | ||
| Cargo.lock | ||
| Cargo.toml | ||
| default.nix | ||
| README.md | ||
| shell.nix | ||
Tvix Evaluator
This project implements an interpreter for the Nix programming language. You can experiment with an online version of the evaluator: tvixbolt.
The interpreter aims to be compatible with nixpkgs, on the
foundation of Nix 2.3.
Important note: The evaluator is not yet feature-complete, and while the core mechanisms (compiler, runtime, ...) have stabilised somewhat, a lot of components are still changing rapidly.
Please contact TVL with any questions you might have.
Building the evaluator
If you are in a full checkout of the TVL depot, you can simply run mg build in this directory (or mg build //tvix/eval from anywhere in
the repo).
Important note: We only use and test Nix builds of our software against Nix 2.3. There are a variety of bugs and subtle problems in newer Nix versions which we do not have the bandwidth to address, builds in newer Nix versions may or may not work.
The evaluator can also be built with standard Rust tooling (i.e.
cargo build).
If you would like to clone only the evaluator and build it directly with Rust tooling, you can do:
git clone https://code.tvl.fyi/depot.git:/tvix/eval.git tvix-eval
cd tvix-eval && cargo build
Nix test suite
C++ Nix implements a language test suite in the form of Nix source code files, and their expected output. The coverage of this test suite is not complete, but we intend to be compatible with it.
We have ported the test suite to Tvix, but do not run it by default as we are not yet compatible with it.
You can run the test suite by enabling the nix_tests feature in
Cargo:
cargo test --features nix_tests
rnix-parser
Tvix is written in memory of jD91mZM2, the author of rnix-parser who sadly passed away.
Tvix makes heavy use of rnix-parser in its bytecode compiler. The parser is now maintained by Nix community members.