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| 1 | namespace Semantic.Symbols is | |
| 2 | use Types.Type | |
| 3 | ||
| 4 | use Ghul.Pipes | |
| 5 | ||
| 6 | // Copies the constraints of the type parameters a state machine | |
| 7 | // frame captures onto the parameters it declares to mirror them. | |
| 8 | // The kinds are copied as each mirror is declared; a bound can name | |
| 9 | // any captured parameter, so the bounds are held until every mirror | |
| 10 | // exists and are then rewritten through `rewrite`. | |
| 11 | class CAPTURED_CONSTRAINT_MIRROR(rewrite: (Type) -> Type) is | |
| 12 | _pending: Collections.LIST[(mirror: GenericArgument, bounds: Collections.List[Type])] | |
| 13 | ||
| 14 | init(..) is | |
| 15 | _pending = | |
| 16 | Collections.LIST[ | |
| 17 | (mirror: GenericArgument, bounds: Collections.List[Type])]() | |
| 18 | si | |
| 19 | ||
| 20 | // `source` is the symbol declaring the captured parameter - the | |
| 21 | // frame's owning class or its owning function - and `index` the | |
| 22 | // parameter's position in that symbol's own list. | |
| 23 | capture(mirror: Symbol, source: Symbol, index: int) is | |
| 24 | if let argument: GenericArgument = mirror then | |
| 25 | argument.set_constraint_kind( | |
| 26 | source.get_argument_constraint_kind(index)) | |
| 27 | ||
| 28 | argument.set_has_constructor_constraint( | |
| 29 | source.get_argument_has_constructor_constraint(index)) | |
| 30 | ||
| 31 | _pending.add( | |
| 32 | ( | |
| 33 | mirror = argument, | |
| 34 | bounds = source.get_argument_type_bounds(index))) | |
| 35 | fi | |
| 36 | si | |
| 37 | ||
| 38 | apply_bounds() is | |
| 39 | for (mirror, bounds) in _pending do | |
| 40 | if bounds.count > 0 then | |
| 41 | mirror.set_ancestor_types( | |
| 42 | bounds |> map(bound => rewrite(bound)) |> collect()) | |
| 43 | fi | |
| 44 | od | |
| 45 | si | |
| 46 | si | |
| 47 | si |