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open Desc
open Tools
module Comparer = struct
type ('a, 'b) t = 'a -> 'b -> int
end
module Comparers = BinaryVector (Comparer)
type ('a, 'b) hook_fun =
'a refl -> 'b refl -> (?hook : hook -> ('a, 'b) Comparer.t) ->
('a, 'b) Comparer.t
and hook = { hook : 'a 'b . ('a, 'b) hook_fun }
type ('a, 'arity, 'b) typed_attribute_kind +=
| Attribute_compare : ('a, 'arity, ('a, 'a) Comparer.t) typed_attribute_kind
type ('arity_a, 'gadt_a, 'arity_b, 'gadt_b) poly =
| Poly
| Mono of {
converters : ('arity_a, 'arity_b) Convert.converters;
eq_gadt : ('gadt_a, 'gadt_b) eq;
}
let rec compare_gen :
type a b structure arity_a arity_b rec_group positive negative direct gadt_a
gadt_b .
?hook : hook ->
(a, structure, arity_a, rec_group, [< Kinds.comparable],
positive, negative, direct, gadt_a) desc ->
(b, structure, arity_b, rec_group, [< Kinds.comparable],
positive, negative, direct, gadt_b) desc ->
(arity_a, gadt_a, arity_b, gadt_b) poly ->
(arity_a, arity_b, direct) Comparers.t ->
(a, b) Comparer.t =
fun ?hook desc_a desc_b poly comparers ->
let compare_tuple :
type a b structure arity_a arity_b rec_group positive negative direct
gadt_a gadt_b.
(a, structure, arity_a, rec_group, [< Kinds.comparable],
positive, negative, direct, gadt_a) Tuple.t ->
(b, structure, arity_b, rec_group, [< Kinds.comparable],
positive, negative, direct, gadt_b) Tuple.t ->
(arity_a, gadt_a, arity_b, gadt_b) poly ->
(arity_a, arity_b, direct) Comparers.t ->
int =
fun x y poly comparers ->
let open Tuple.Items in
match
Tuple.find [x; y]
begin fun (Tuple.Find { items = [x; y]; _ }) ->
match
compare_gen ?hook x.desc y.desc poly comparers x.value y.value with
| 0 -> None
| result -> Some result
end
with
| None -> 0
| Some result -> result in
let compare_record :
type a b structure arity_a arity_b rec_group positive negative direct
gadt_a gadt_b.
(a, structure, arity_a, rec_group, [< Kinds.comparable],
positive, negative, direct, gadt_a) Record.t ->
(b, structure, arity_b, rec_group, [< Kinds.comparable],
positive, negative, direct, gadt_b) Record.t ->
(arity_a, gadt_a, arity_b, gadt_b) poly ->
(arity_a, arity_b, direct) Comparers.t ->
int =
fun x y poly comparers ->
let open Record.Fields in
match
Record.find [x; y]
begin fun (Record.Find { items = [x; y]; _ }) ->
match x.field, y.field with
| Mono x', Mono y' ->
match
compare_gen ?hook x'.desc y'.desc poly comparers x.value y.value
with
| 0 -> None
| result -> Some result
end
with
| None -> 0
| Some result -> result in
match desc_a, desc_b with
| Variable index_a, Variable index_b ->
Comparers.get index_a index_b comparers
| Builtin Bool, Builtin Bool-> Stdcompat.compare
| Builtin Bytes, Builtin Bytes -> Stdcompat.compare
| Builtin Char, Builtin Char -> Stdcompat.compare
| Builtin Float, Builtin Float -> Stdcompat.compare
| Builtin Int, Builtin Int -> Stdcompat.compare
| Builtin Int32, Builtin Int32 -> Stdcompat.compare
| Builtin Int64, Builtin Int64 -> Stdcompat.compare
| Builtin Nativeint, Builtin Nativeint -> Stdcompat.compare
| Builtin String, Builtin String -> Stdcompat.compare
| Array desc_a, Array desc_b ->
fun x y ->
begin match Stdcompat.compare (Array.length x) (Array.length y) with
| 0 ->
let rec check i =
if i >= Array.length x then
0
else
match compare_gen ?hook desc_a desc_b poly comparers
(Array.unsafe_get x i) (Array.unsafe_get y i) with
| 0 -> check (succ i)
| result -> result in
check 0
| result -> result
end
| Constr a, Constr b ->
fun x y ->
let Constructor.Destruct x =
Constructor.destruct a.constructors (a.destruct x) in
let Constructor.Destruct y =
Constructor.destruct b.constructors (b.destruct y) in
begin match compare_binary_selection x.index_desc y.index_desc with
| LessThan -> -1
| GreaterThan -> 1
| Equal Eq ->
let Eq =
binary_selection_functional_head x.index_desc y.index_desc in
match x.link, y.link with
| Constructor.Exists xl, Constructor.Exists yl ->
let Absent = xl.presence in
let Eq =
append_functional xl.variables.positive yl.variables.positive in
let Eq =
append_functional xl.variables.negative yl.variables.negative in
let Eq =
append_functional xl.variables.direct yl.variables.direct in
let comparers =
Comparers.append None xl.variables.presences
xl.variables.direct_count xl.variables.direct xl.exists_count
xl.exists yl.exists_count yl.exists comparers in
begin match x.kind, y.kind with
| Constructor.Tuple x, Constructor.Tuple y ->
compare_tuple x y Poly comparers
| Constructor.Record x, Constructor.Record y ->
compare_record x y Poly comparers
end
| Constructor.Constructor, Constructor.Constructor ->
match x.kind, y.kind with
| Constructor.Tuple x, Constructor.Tuple y ->
compare_tuple x y poly comparers
| Constructor.Record x, Constructor.Record y ->
compare_record x y poly comparers
end
| Object _, Object _ ->
fun x y -> Stdcompat.compare (Oo.id x) (Oo.id y)
| Tuple a, Tuple b ->
fun x y ->
compare_tuple
{ structure = Tuple.of_desc a.structure; values = a.destruct x }
{ structure = Tuple.of_desc b.structure; values = b.destruct y }
poly comparers
| Record a, Record b ->
fun x y ->
compare_record
{ structure = a.structure; values = a.destruct x }
{ structure = b.structure; values = b.destruct y }
poly comparers
| Variant a, Variant b ->
fun x y ->
let Variant.Destruct x = Variant.destruct a.constructors (a.destruct x) in
let Variant.Destruct y = Variant.destruct b.constructors (b.destruct y) in
begin match compare_selection x.index_desc y.index_desc with
| LessThan -> -1
| GreaterThan -> 1
| Equal Eq ->
let Eq =
selection_functional_head x.index_desc y.index_desc in
match x.kind, y.kind with
| Variant.Constructor { argument = Variant.None; _ },
Variant.Constructor { argument = Variant.None; _ } -> 0
| Variant.Constructor { argument = Variant.Some x; _ },
Variant.Constructor { argument = Variant.Some y; _ } ->
compare_gen ?hook x.desc y.desc poly comparers x.value y.value
| Variant.Inherit x, Variant.Inherit y ->
compare_gen ?hook x.desc y.desc poly comparers x.value y.value
end
| Lazy desc_a, Lazy desc_b ->
fun x y ->
compare_gen ?hook desc_a desc_b poly comparers (Lazy.force x)
(Lazy.force y)
| Apply a, Apply b ->
let comparers =
Comparers.make { f = fun x y -> compare_gen ?hook x y poly } a.arguments
b.arguments a.transfer comparers in
compare_gen ?hook a.desc b.desc begin match poly with
| Poly -> Poly
| Mono { converters; eq_gadt = Eq } ->
let converters =
Convert.transfer a.arguments b.arguments converters (Some Eq) in
Mono { converters = Converters converters; eq_gadt = Eq }
end comparers
| Rec a, Rec b ->
let Eq = binary_selection_functional_head a.index b.index in
compare_gen ?hook a.desc b.desc poly comparers
| RecGroup a, RecGroup b ->
compare_gen ?hook a.desc b.desc poly comparers
| MapOpaque _, MapOpaque _ ->
fun _ _ -> 0
| Opaque _ , Opaque _ ->
fun _ _ -> 0
| SelectGADT a, SelectGADT b ->
compare_gen ?hook a.desc b.desc begin match poly with
| Poly -> Poly
| Mono { converters; eq_gadt = Eq } ->
let Eq = Convert.selection a.index b.index in
Mono { converters; eq_gadt = Eq }
end comparers
| SubGADT a, SubGADT b ->
compare_gen ?hook a.desc b.desc begin match poly with
| Poly -> Poly
| Mono { converters; eq_gadt = Eq } ->
let Eq = sub_gadt_functional a.sub_gadt b.sub_gadt in
Mono { converters; eq_gadt = Eq }
end comparers
| Attributes a, Attributes b ->
begin match
a.attributes.typed Attribute_compare,
b.attributes.typed Attribute_compare, poly with
| None, None, _ ->
compare_gen ?hook a.desc b.desc poly comparers
| Some comparer, _, Mono { converters; eq_gadt = Eq } ->
fun x y ->
comparer x (Convert.convert b.desc a.desc
(Convert.reverse converters) (Some Eq) y)
| _, Some comparer, Mono { converters; eq_gadt = Eq } ->
fun x y ->
comparer (Convert.convert a.desc b.desc converters (Some Eq) x) y
| _, _, Poly ->
invalid_arg "Cannot use custom compare for polymorphic comparisons"
end
| Name a, Name b ->
begin match hook with
| None -> compare_gen a.desc b.desc poly comparers
| Some hook ->
hook.hook a.refl b.refl (fun ?(hook = hook) ->
compare_gen ~hook a.desc b.desc poly comparers)
end
| _ -> .
let compare_poly ?hook desc_a desc_b comparers =
compare_gen ?hook desc_a desc_b Poly comparers
let compare ?hook desc comparers =
compare_gen ?hook desc desc (Mono { converters = SameArity Eq; eq_gadt = Eq })
comparers