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feat(tvix/eval): Implement builtins.tryEval

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With asserts compiled using conditional jumps, this ends up being quite
straightforward - the only real tricky bit is that we have to know
whether an error can or can't be handled.

Change-Id: I75617da73b7a9c5cdd888c0e26ae81d2c5c0d714
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6924
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
This commit is contained in:
Griffin Smith 2022-10-10 11:54:53 -04:00 • committed by clbot
parent 0b8a967aca
commit 4fd18cbc9a
4 changed files with 32 additions and 0 deletions
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15
tvix/eval/src/builtins/mod.rs
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@ -431,6 +431,21 @@ fn pure_builtins() -> Vec<Builtin> {
Builtin::new("throw", &[true], |args: Vec<Value>, _: &mut VM| {
Err(ErrorKind::Throw(args[0].to_str()?.to_string()))
}),
Builtin::new("tryEval", &[false], |args: Vec<Value>, vm: &mut VM| {
let mut res = BTreeMap::new();
match args[0].force(vm) {
Ok(value) => {
res.insert("value".into(), (*value).clone());
res.insert("success".into(), true.into());
}
Err(e) if e.is_catchable() => {
res.insert("value".into(), false.into());
res.insert("success".into(), false.into());
}
Err(e) => return Err(e),
}
Ok(Value::attrs(NixAttrs::from_map(res)))
}),
// coerce_to_string forces for us
Builtin::new("toString", &[false], |args: Vec<Value>, vm: &mut VM| {
args[0]