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|
//! 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::{BTreeMap, HashMap},
rc::Rc,
};
use crate::{
errors::ErrorKind,
value::{Builtin, NixAttrs, NixString, Value},
};
fn pure_builtins() -> Vec<Builtin> {
vec![
Builtin::new("abort", 1, |mut args| {
return Err(
ErrorKind::Abort(args.pop().unwrap().to_string()?.as_str().to_owned()).into(),
);
}),
Builtin::new("isNull", 1, |args| {
Ok(Value::Bool(matches!(args[0], Value::Null)))
}),
Builtin::new("throw", 1, |mut args| {
return Err(
ErrorKind::Throw(args.pop().unwrap().to_string()?.as_str().to_owned()).into(),
);
}),
Builtin::new("toString", 1, |args| {
// TODO: toString is actually not the same as Display
Ok(Value::String(format!("{}", args[0]).into()))
}),
]
}
fn builtins_set() -> NixAttrs {
let mut map: BTreeMap<NixString, Value> = BTreeMap::new();
for builtin in pure_builtins() {
map.insert(builtin.name().into(), Value::Builtin(builtin));
}
NixAttrs::from_map(map)
}
/// Set of Nix builtins that are globally available.
pub fn global_builtins() -> HashMap<&'static str, Value> {
let builtins = builtins_set();
let mut globals: HashMap<&'static str, Value> = HashMap::new();
// known global builtins from the builtins set.
for global in &[
"abort",
"baseNameOf",
"derivation",
"derivationStrict",
"dirOf",
"fetchGit",
"fetchMercurial",
"fetchTarball",
"fromTOML",
"import",
"isNull",
"map",
"placeholder",
"removeAttrs",
"scopedImport",
"throw",
"toString",
] {
if let Some(builtin) = builtins.select(global) {
globals.insert(global, builtin.clone());
}
}
globals.insert("builtins", Value::Attrs(Rc::new(builtins)));
globals
}
|
