diff options
author | Vincent Ambo <mail@tazj.in> | 2022-08-24T13·03+0300 |
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committer | tazjin <tazjin@tvl.su> | 2022-09-02T12·59+0000 |
commit | e1147b57c74d23a3f18b1a1e7413e4d0b9d5e2ba (patch) | |
tree | 3ca30a9dc1ac2910c34569276927f0ebacf830c1 /tvix/eval/src/builtins | |
parent | ca90c0f45ad9892c35a2a0402939b857a6fca08e (diff) |
feat(tvix/eval): introduce mechanism for defining builtins r/4588
Adds a new builtins module in which builtins can be constructed. The functions in this module should return a correctly structured value to be passed to the compiler's `globals`. This is wired up all the way to the compiler with an example `toString` builtin, available as a global. Note that this does not yet actually behave like the real toString, which has some differences from `Display`. Change-Id: Ibb5f6fbe6207782fdf2434435567fc1bd80039a5 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6254 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
Diffstat (limited to 'tvix/eval/src/builtins')
-rw-r--r-- | tvix/eval/src/builtins/mod.rs | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs new file mode 100644 index 000000000000..62bfd145c0a9 --- /dev/null +++ b/tvix/eval/src/builtins/mod.rs @@ -0,0 +1,26 @@ +//! This module implements the builtins exposed in the Nix language. +//! +//! See //tvix/eval/docs/builtins.md for a some context on the +//! available builtins in Nix. + +use std::collections::HashMap; + +use crate::value::{Builtin, Value}; + +macro_rules! builtin { + ( $map:ident, $name:literal, $arity:literal, $body:expr ) => { + $map.insert($name, Value::Builtin(Builtin::new($name, $arity, $body))); + }; +} + +/// Set of Nix builtins that are globally available. +pub fn global_builtins() -> HashMap<&'static str, Value> { + let mut globals = HashMap::new(); + + builtin!(globals, "toString", 1, |args| { + // TODO: toString is actually not the same as Display + Ok(Value::String(format!("{}", args[0]).into())) + }); + + globals +} |