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feat(tvix/eval): add initial representation of builtins

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Builtins are represented as a Rust function pointer that accepts a
vector of arguments, which represents variable arity builtins.

Change-Id: Ibab7e662a646caf1172695d876d2f55e187c03dd
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6251
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
This commit is contained in:
Vincent Ambo 2022-08-24 11:00:30 +03:00 • committed by tazjin
parent 64746388e2
commit e0f1356ae3
3 changed files with 76 additions and 1 deletions
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6
tvix/eval/src/value/mod.rs
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@ -4,12 +4,14 @@ use std::rc::Rc;
use std::{fmt::Display, path::PathBuf};
mod attrs;
mod builtin;
mod lambda;
mod list;
mod string;
use crate::errors::{ErrorKind, EvalResult};
pub use attrs::NixAttrs;
pub use builtin::Builtin;
pub use lambda::Lambda;
pub use list::NixList;
pub use string::NixString;
@ -26,6 +28,7 @@ pub enum Value {
Attrs(Rc<NixAttrs>),
List(NixList),
Lambda(Lambda),
Builtin(Builtin),
// Internal values that, while they technically exist at runtime,
// are never returned to or created directly by users.
@ -49,7 +52,7 @@ impl Value {
Value::Path(_) => "path",
Value::Attrs(_) => "set",
Value::List(_) => "list",
Value::Lambda(_) => "lambda",
Value::Lambda(_) | Value::Builtin(_) => "lambda",
// Internal types
Value::AttrPath(_) | Value::Blackhole | Value::NotFound => "internal",
@ -128,6 +131,7 @@ impl Display for Value {
Value::Attrs(attrs) => attrs.fmt(f),
Value::List(list) => list.fmt(f),
Value::Lambda(_) => f.write_str("lambda"), // TODO: print position
Value::Builtin(builtin) => builtin.fmt(f),
// Nix prints floats with a maximum precision of 5 digits
// only.