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Implement List.find

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`List.find : List elem, (elem -> Bool) -> Result elem [ NotFound ]*`
behaves as follows:

```
>>> List.find [1, 2, 3] (\n -> n > 2)
Ok 2
>>> List.find [1, 2, 3] (\n -> n > 4)
Err NotFound
```

We implement this as builtin in two phases. First, we call out to a
pure-llvm-lowlevel `ListFindUnsafe` that returns a record indicating
whether a satisfying element was found, and the value of that element
(the value is all null bytes if the element wasn't found). Then, we lift
that record to a `Result` via a standard construction of the can AST.

Closes #1909
This commit is contained in:
ayazhafiz 2021-11-07 20:56:46 -05:00
parent 35df58c18f
commit f65b174ab5
16 changed files with 417 additions and 8 deletions
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4
compiler/mono/src/low_level.rs
View file

@ -50,6 +50,9 @@ pub enum HigherOrder {
ListAny {
xs: Symbol,
},
ListFindUnsafe {
xs: Symbol,
},
DictWalk {
xs: Symbol,
state: Symbol,
@ -71,6 +74,7 @@ impl HigherOrder {
HigherOrder::ListKeepOks { .. } => 1,
HigherOrder::ListKeepErrs { .. } => 1,
HigherOrder::ListSortWith { .. } => 2,
HigherOrder::ListFindUnsafe { .. } => 1,
HigherOrder::DictWalk { .. } => 2,
HigherOrder::ListAny { .. } => 1,
}