- Closes#2330
- Closes#2329
This pr implements the syntax changes described in #2330. It drops
support for the old yaml-based syntax.
Some valid examples:
```
syntax iterator for {init := 1; range := 1};
syntax fixity cons := binary {assoc := right};
syntax fixity cmp := binary;
syntax fixity cmp := binary {}; -- debatable whether we want to accept empty {} or not. I think we should
```
# Future work
This pr creates an asymmetry between iterators and operators
definitions. Iterators definition do not require a constructor. We could
add it to make it homogeneous, but it looks a bit redundant:
```
syntax iterator for := mkIterator {init := 1; range := 1};
```
We could consider merging iterator and fixity declarations with this
alternative syntax.
```
syntax XXX for := iterator {init := 1; range := 1};
syntax XXX cons := binary {assoc := right};
```
where `XXX` is a common keyword. Suggestion by @lukaszcz XXX = declare
---------
Co-authored-by: Łukasz Czajka <62751+lukaszcz@users.noreply.github.com>
Co-authored-by: Lukasz Czajka <lukasz@heliax.dev>
* Closes#1992
A function identifier `fun` can be declared as an iterator with
```
syntax iterator fun;
```
For example:
```haskell
syntax iterator for;
for : {A B : Type} -> (A -> B -> A) -> A -> List B -> List A;
for f acc nil := acc;
for f acc (x :: xs) := for (f acc x) xs;
```
Iterator application syntax allows for a finite number of initializers
`acc := a` followed by a finite number of ranges `x in xs`. For example:
```
for (acc := 0) (x in lst) acc + x
```
The number of initializers plus the number of ranges must be non-zero.
An iterator application
```
fun (acc1 := a1; ..; accn := an) (x1 in b1; ..; xk in bk) body
```
gets desugared to
```
fun \{acc1 .. accn x1 .. xk := body} a1 .. an b1 .. bk
```
The `acc1`, ..., `accn`, `x1`, ..., `xk` can be patterns.
The desugaring works on a purely syntactic level. Without further
restrictions, it is not checked if the number of initializers/ranges
matches the type of the identifier. The restrictions on the number of
initializers/ranges can be specified in iterator declaration:
```
syntax iterator fun {init: n, range: k};
syntax iterator for {init: 1, range: 1};
syntax iterator map {init: 0, range: 1};
```
The attributes (`init`, `range`) in between braces are parsed as YAML to
avoid inventing and parsing a new attribute language. Both attributes
are optional.
