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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
open Errors
open Util
open Names
open Globnames
open Term
open Reduction
open Declarations
open Environ
open Libobject
open Lib
open Pp
open Constrexpr
open Termops
open Namegen
open Decl_kinds
(*s Flags governing the computation of implicit arguments *)
type implicits_flags = {
auto : bool; (* automatic or manual only *)
strict : bool; (* true = strict *)
strongly_strict : bool; (* true = strongly strict *)
reversible_pattern : bool;
contextual : bool; (* true = contextual *)
maximal : bool
}
let implicit_args = ref {
auto = false;
strict = true;
strongly_strict = false;
reversible_pattern = false;
contextual = false;
maximal = false;
}
let make_implicit_args flag =
implicit_args := { !implicit_args with auto = flag }
let make_strict_implicit_args flag =
implicit_args := { !implicit_args with strict = flag }
let make_strongly_strict_implicit_args flag =
implicit_args := { !implicit_args with strongly_strict = flag }
let make_reversible_pattern_implicit_args flag =
implicit_args := { !implicit_args with reversible_pattern = flag }
let make_contextual_implicit_args flag =
implicit_args := { !implicit_args with contextual = flag }
let make_maximal_implicit_args flag =
implicit_args := { !implicit_args with maximal = flag }
let is_implicit_args () = !implicit_args.auto
let is_strict_implicit_args () = !implicit_args.strict
let is_strongly_strict_implicit_args () = !implicit_args.strongly_strict
let is_reversible_pattern_implicit_args () = !implicit_args.reversible_pattern
let is_contextual_implicit_args () = !implicit_args.contextual
let is_maximal_implicit_args () = !implicit_args.maximal
let with_implicits flags f x =
let oflags = !implicit_args in
try
implicit_args := flags;
let rslt = f x in
implicit_args := oflags;
rslt
with reraise ->
let reraise = Errors.push reraise in
let () = implicit_args := oflags in
raise reraise
let set_maximality imps b =
(* Force maximal insertion on ending implicits (compatibility) *)
let is_set x = match x with None -> false | _ -> true in
b || List.for_all is_set imps
(*s Computation of implicit arguments *)
(* We remember various information about why an argument is
inferable as implicit
- [DepRigid] means that the implicit argument can be found by
unification along a rigid path (we do not print the arguments of
this kind if there is enough arguments to infer them)
- [DepFlex] means that the implicit argument can be found by unification
along a collapsable path only (e.g. as x in (P x) where P is another
argument) (we do (defensively) print the arguments of this kind)
- [DepFlexAndRigid] means that the least argument from which the
implicit argument can be inferred is following a collapsable path
but there is a greater argument from where the implicit argument is
inferable following a rigid path (useful to know how to print a
partial application)
- [Manual] means the argument has been explicitely set as implicit.
We also consider arguments inferable from the conclusion but it is
operational only if [conclusion_matters] is true.
*)
type argument_position =
| Conclusion
| Hyp of int
let argument_position_eq p1 p2 = match p1, p2 with
| Conclusion, Conclusion -> true
| Hyp h1, Hyp h2 -> Int.equal h1 h2
| _ -> false
let explicitation_eq ex1 ex2 = match ex1, ex2 with
| ExplByPos (i1, id1), ExplByPos (i2, id2) ->
Int.equal i1 i2 && Option.equal Id.equal id1 id2
| ExplByName id1, ExplByName id2 ->
Id.equal id1 id2
| _ -> false
type implicit_explanation =
| DepRigid of argument_position
| DepFlex of argument_position
| DepFlexAndRigid of (*flex*) argument_position * (*rig*) argument_position
| Manual
let argument_less = function
| Hyp n, Hyp n' -> n<n'
| Hyp _, Conclusion -> true
| Conclusion, _ -> false
let update pos rig (na,st) =
let e =
if rig then
match st with
| None -> DepRigid pos
| Some (DepRigid n as x) ->
if argument_less (pos,n) then DepRigid pos else x
| Some (DepFlexAndRigid (fpos,rpos) as x) ->
if argument_less (pos,fpos) || argument_position_eq pos fpos then DepRigid pos else
if argument_less (pos,rpos) then DepFlexAndRigid (fpos,pos) else x
| Some (DepFlex fpos) ->
if argument_less (pos,fpos) || argument_position_eq pos fpos then DepRigid pos
else DepFlexAndRigid (fpos,pos)
| Some Manual -> assert false
else
match st with
| None -> DepFlex pos
| Some (DepRigid rpos as x) ->
if argument_less (pos,rpos) then DepFlexAndRigid (pos,rpos) else x
| Some (DepFlexAndRigid (fpos,rpos) as x) ->
if argument_less (pos,fpos) then DepFlexAndRigid (pos,rpos) else x
| Some (DepFlex fpos as x) ->
if argument_less (pos,fpos) then DepFlex pos else x
| Some Manual -> assert false
in na, Some e
(* modified is_rigid_reference with a truncated env *)
let is_flexible_reference env bound depth f =
match kind_of_term f with
| Rel n when n >= bound+depth -> (* inductive type *) false
| Rel n when n >= depth -> (* previous argument *) true
| Rel n -> (* since local definitions have been expanded *) false
| Const (kn,_) ->
let cb = Environ.lookup_constant kn env in
(match cb.const_body with Def _ -> true | _ -> false)
| Var id ->
let (_, value, _) = Environ.lookup_named id env in
begin match value with None -> false | _ -> true end
| Ind _ | Construct _ -> false
| _ -> true
let push_lift d (e,n) = (push_rel d e,n+1)
let is_reversible_pattern bound depth f l =
isRel f && let n = destRel f in (n < bound+depth) && (n >= depth) &&
Array.for_all (fun c -> isRel c && destRel c < depth) l &&
Array.distinct l
(* Precondition: rels in env are for inductive types only *)
let add_free_rels_until strict strongly_strict revpat bound env m pos acc =
let rec frec rig (env,depth as ed) c =
let hd = if strict then whd_betadeltaiota env c else c in
let c = if strongly_strict then hd else c in
match kind_of_term hd with
| Rel n when (n < bound+depth) && (n >= depth) ->
let i = bound + depth - n - 1 in
acc.(i) <- update pos rig acc.(i)
| App (f,l) when revpat && is_reversible_pattern bound depth f l ->
let i = bound + depth - destRel f - 1 in
acc.(i) <- update pos rig acc.(i)
| App (f,_) when rig && is_flexible_reference env bound depth f ->
if strict then () else
iter_constr_with_full_binders push_lift (frec false) ed c
| Proj (p,c) when rig ->
if strict then () else
iter_constr_with_full_binders push_lift (frec false) ed c
| Case _ when rig ->
if strict then () else
iter_constr_with_full_binders push_lift (frec false) ed c
| Evar _ -> ()
| _ ->
iter_constr_with_full_binders push_lift (frec rig) ed c
in
let () = if not (Vars.noccur_between 1 bound m) then frec true (env,1) m in
acc
let rec is_rigid_head t = match kind_of_term t with
| Rel _ | Evar _ -> false
| Ind _ | Const _ | Var _ | Sort _ -> true
| Case (_,_,f,_) -> is_rigid_head f
| Proj (p,c) -> true
| App (f,args) ->
(match kind_of_term f with
| Fix ((fi,i),_) -> is_rigid_head (args.(fi.(i)))
| _ -> is_rigid_head f)
| Lambda _ | LetIn _ | Construct _ | CoFix _ | Fix _
| Prod _ | Meta _ | Cast _ -> assert false
(* calcule la liste des arguments implicites *)
let find_displayed_name_in all avoid na (_,b as envnames_b) =
let flag = RenamingElsewhereFor envnames_b in
if all then compute_and_force_displayed_name_in flag avoid na b
else compute_displayed_name_in flag avoid na b
let compute_implicits_gen strict strongly_strict revpat contextual all env t =
let rigid = ref true in
let rec aux env avoid n names t =
let t = whd_betadeltaiota env t in
match kind_of_term t with
| Prod (na,a,b) ->
let na',avoid' = find_displayed_name_in all avoid na (names,b) in
add_free_rels_until strict strongly_strict revpat n env a (Hyp (n+1))
(aux (push_rel (na',None,a) env) avoid' (n+1) (na'::names) b)
| _ ->
rigid := is_rigid_head t;
let names = List.rev names in
let v = Array.map (fun na -> na,None) (Array.of_list names) in
if contextual then
add_free_rels_until strict strongly_strict revpat n env t Conclusion v
else v
in
match kind_of_term (whd_betadeltaiota env t) with
| Prod (na,a,b) ->
let na',avoid = find_displayed_name_in all [] na ([],b) in
let v = aux (push_rel (na',None,a) env) avoid 1 [na'] b in
!rigid, Array.to_list v
| _ -> true, []
let compute_implicits_flags env f all t =
compute_implicits_gen
(f.strict || f.strongly_strict) f.strongly_strict
f.reversible_pattern f.contextual all env t
let compute_auto_implicits env flags enriching t =
if enriching then compute_implicits_flags env flags true t
else compute_implicits_gen false false false true true env t
let compute_implicits_names env t =
let _, impls = compute_implicits_gen false false false false true env t in
List.map fst impls
let compute_implicits_strict env t =
List.map snd (snd (compute_implicits_gen true true true true false env t))
(* Extra information about implicit arguments *)
type maximal_insertion = bool (* true = maximal contextual insertion *)
type force_inference = bool (* true = always infer, never turn into evar/subgoal *)
type implicit_status =
(* None = Not implicit *)
(Id.t * implicit_explanation * (maximal_insertion * force_inference)) option
type implicit_side_condition = DefaultImpArgs | LessArgsThan of int
type implicits_list = implicit_side_condition * implicit_status list
let is_status_implicit = function
| None -> false
| _ -> true
let name_of_implicit = function
| None -> anomaly (Pp.str "Not an implicit argument")
| Some (id,_,_) -> id
let maximal_insertion_of = function
| Some (_,_,(b,_)) -> b
| None -> anomaly (Pp.str "Not an implicit argument")
let force_inference_of = function
| Some (_, _, (_, b)) -> b
| None -> anomaly (Pp.str "Not an implicit argument")
(* [in_ctx] means we know the expected type, [n] is the index of the argument *)
let is_inferable_implicit in_ctx n = function
| None -> false
| Some (_,DepRigid (Hyp p),_) -> in_ctx || n >= p
| Some (_,DepFlex (Hyp p),_) -> false
| Some (_,DepFlexAndRigid (_,Hyp q),_) -> in_ctx || n >= q
| Some (_,DepRigid Conclusion,_) -> in_ctx
| Some (_,DepFlex Conclusion,_) -> false
| Some (_,DepFlexAndRigid (_,Conclusion),_) -> in_ctx
| Some (_,Manual,_) -> true
let positions_of_implicits (_,impls) =
let rec aux n = function
[] -> []
| Some _ :: l -> n :: aux (n+1) l
| None :: l -> aux (n+1) l
in aux 1 impls
(* Manage user-given implicit arguments *)
let rec prepare_implicits f = function
| [] -> []
| (Anonymous, Some _)::_ -> anomaly (Pp.str "Unnamed implicit")
| (Name id, Some imp)::imps ->
let imps' = prepare_implicits f imps in
Some (id,imp,(set_maximality imps' f.maximal,true)) :: imps'
| _::imps -> None :: prepare_implicits f imps
let set_implicit id imp insmax =
(id,(match imp with None -> Manual | Some imp -> imp),insmax)
let rec assoc_by_pos k = function
(ExplByPos (k', x), b) :: tl when Int.equal k k' -> (x,b), tl
| hd :: tl -> let (x, tl) = assoc_by_pos k tl in x, hd :: tl
| [] -> raise Not_found
let check_correct_manual_implicits autoimps l =
List.iter (function
| ExplByName id,(b,fi,forced) ->
if not forced then
error ("Wrong or non-dependent implicit argument name: "^(Id.to_string id)^".")
| ExplByPos (i,_id),_t ->
if i<1 || i>List.length autoimps then
error ("Bad implicit argument number: "^(string_of_int i)^".")
else
errorlabstrm ""
(str "Cannot set implicit argument number " ++ int i ++
str ": it has no name.")) l
let set_manual_implicits env flags enriching autoimps l =
let try_forced k l =
try
let (id, (b, fi, fo)), l' = assoc_by_pos k l in
if fo then
let id = match id with Some id -> id | None -> Id.of_string ("arg_" ^ string_of_int k) in
l', Some (id,Manual,(b,fi))
else l, None
with Not_found -> l, None
in
if not (List.distinct l) then
error ("Some parameters are referred more than once.");
(* Compare with automatic implicits to recover printing data and names *)
let rec merge k l = function
| (Name id,imp)::imps ->
let l',imp,m =
try
let eq = explicitation_eq in
let (b, fi, fo) = List.assoc_f eq (ExplByName id) l in
List.remove_assoc_f eq (ExplByName id) l, (Some Manual), (Some (b, fi))
with Not_found ->
try
let (id, (b, fi, fo)), l' = assoc_by_pos k l in
l', (Some Manual), (Some (b,fi))
with Not_found ->
let m = match enriching, imp with
| true, Some _ -> Some (flags.maximal, true)
| _ -> None
in
l, imp, m
in
let imps' = merge (k+1) l' imps in
let m = Option.map (fun (b,f) ->
(* match imp with Some Manual -> (b,f) *)
(* | _ -> *)set_maximality imps' b, f) m in
Option.map (set_implicit id imp) m :: imps'
| (Anonymous,imp)::imps ->
let l', forced = try_forced k l in
forced :: merge (k+1) l' imps
| [] when begin match l with [] -> true | _ -> false end -> []
| [] ->
check_correct_manual_implicits autoimps l;
[]
in
merge 1 l autoimps
let compute_semi_auto_implicits env f manual t =
let strictimpls = compute_implicits_strict env t in
let auto = match manual with
| [] ->
if not f.auto then [DefaultImpArgs, []]
else let _,l = compute_implicits_flags env f false t in
[DefaultImpArgs, prepare_implicits f l]
| _ ->
let _,autoimpls = compute_auto_implicits env f f.auto t in
[DefaultImpArgs, set_manual_implicits env f f.auto autoimpls manual] in
strictimpls,auto
(*s Constants. *)
let compute_constant_implicits flags manual cst =
let env = Global.env () in
let cb = Environ.lookup_constant cst env in
let ty = Typeops.type_of_constant_type env cb.const_type in
let impls = compute_semi_auto_implicits env flags manual ty in
impls
(*s Inductives and constructors. Their implicit arguments are stored
in an array, indexed by the inductive number, of pairs $(i,v)$ where
$i$ are the implicit arguments of the inductive and $v$ the array of
implicit arguments of the constructors. *)
let compute_mib_implicits flags manual kn =
let env = Global.env () in
let mib = lookup_mind kn env in
let ar =
Array.to_list
(Array.mapi (* No need to lift, arities contain no de Bruijn *)
(fun i mip ->
(** No need to care about constraints here *)
(Name mip.mind_typename, None, Global.type_of_global_unsafe (IndRef (kn,i))))
mib.mind_packets) in
let env_ar = push_rel_context ar env in
let imps_one_inductive i mip =
let ind = (kn,i) in
let ar = Global.type_of_global_unsafe (IndRef ind) in
((IndRef ind,compute_semi_auto_implicits env flags manual ar),
Array.mapi (fun j c ->
(ConstructRef (ind,j+1),compute_semi_auto_implicits env_ar flags manual c))
mip.mind_nf_lc)
in
Array.mapi imps_one_inductive mib.mind_packets
let compute_all_mib_implicits flags manual kn =
let imps = compute_mib_implicits flags manual kn in
List.flatten
(Array.map_to_list (fun (ind,cstrs) -> ind::Array.to_list cstrs) imps)
(*s Variables. *)
let compute_var_implicits flags manual id =
let env = Global.env () in
let (_,_,ty) = lookup_named id env in
compute_semi_auto_implicits env flags manual ty
(* Implicits of a global reference. *)
let compute_global_implicits flags manual = function
| VarRef id -> compute_var_implicits flags manual id
| ConstRef kn -> compute_constant_implicits flags manual kn
| IndRef (kn,i) ->
let ((_,imps),_) = (compute_mib_implicits flags manual kn).(i) in imps
| ConstructRef ((kn,i),j) ->
let (_,cimps) = (compute_mib_implicits flags manual kn).(i) in snd cimps.(j-1)
(* Merge a manual explicitation with an implicit_status list *)
let merge_impls (cond,oldimpls) (_,newimpls) =
let oldimpls,usersuffiximpls = List.chop (List.length newimpls) oldimpls in
cond, (List.map2 (fun orig ni ->
match orig with
| Some (_, Manual, _) -> orig
| _ -> ni) oldimpls newimpls)@usersuffiximpls
(* Caching implicits *)
type implicit_interactive_request =
| ImplAuto
| ImplManual of int
type implicit_discharge_request =
| ImplLocal
| ImplConstant of constant * implicits_flags
| ImplMutualInductive of mutual_inductive * implicits_flags
| ImplInteractive of global_reference * implicits_flags *
implicit_interactive_request
let implicits_table = Summary.ref Refmap.empty ~name:"implicits"
let strict_implicits_of_global n ref =
try
let impls = fst (Refmap.find ref !implicits_table) in
let status = List.map (function
| Some (DepRigid (Hyp k) | DepFlexAndRigid (_,Hyp k)) -> k <= n
| _ -> false) impls in
let m = List.length status in
if m > n then fst (List.chop n status)
else if m < n then status @ List.make (n-m) false
else status
with Not_found -> anomaly (str "No strict implicit arguments." ++ Nametab.pr_global_env Idset.empty ref)
let implicits_of_global ref =
try
let l = snd (Refmap.find ref !implicits_table) in
try
let rename_l = Arguments_renaming.arguments_names ref in
let rename imp name = match imp, name with
| Some (_, x,y), Name id -> Some (id, x,y)
| _ -> imp in
List.map2 (fun (t, il) rl -> t, List.map2 rename il rl) l rename_l
with Not_found -> l
| Invalid_argument _ ->
anomaly (Pp.str "renamings list and implicits list have different lenghts")
with Not_found -> [DefaultImpArgs,[]]
let cache_implicits_decl (ref,imps) =
implicits_table := Refmap.add ref imps !implicits_table
let load_implicits _ (_,(_,l)) = List.iter cache_implicits_decl l
let cache_implicits o =
load_implicits 1 o
let subst_implicits_decl subst (r,imps as o) =
let r' = fst (subst_global subst r) in if r==r' then o else (r',imps)
let subst_implicits (subst,(req,l)) =
(ImplLocal,List.smartmap (subst_implicits_decl subst) l)
let impls_of_context ctx =
let map (id, impl, _, _) = match impl with
| Implicit -> Some (* dummy *) Manual, Some (id, Manual, (true, true))
| _ -> None, None
in
let is_set (_, _, b, _) = match b with
| None -> true
| Some _ -> false
in
List.split (List.rev_map map (List.filter is_set ctx))
let section_segment_of_reference = function
| ConstRef con -> pi1 (section_segment_of_constant con)
| IndRef (kn,_) | ConstructRef ((kn,_),_) ->
pi1 (section_segment_of_mutual_inductive kn)
| _ -> []
let adjust_side_condition p = function
| LessArgsThan n -> LessArgsThan (n+p)
| DefaultImpArgs -> DefaultImpArgs
let add_section_impls vars extra_impls (cond,impls) =
let p = List.length vars - List.length extra_impls in
adjust_side_condition p cond, extra_impls @ impls
let discharge_implicits (_,(req,l)) =
match req with
| ImplLocal -> None
| ImplInteractive (ref,flags,exp) ->
(try
let vars = section_segment_of_reference ref in
let ref' = if isVarRef ref then ref else pop_global_reference ref in
let extrastrict, extra_impls = impls_of_context vars in
let oldstrict,oldimpls = snd (List.hd l) in
let newstrict = extrastrict @ oldstrict in
let newimpls = List.map (add_section_impls vars extra_impls) oldimpls in
let l' = [ref',(newstrict,newimpls)] in
Some (ImplInteractive (ref',flags,exp),l')
with Not_found -> (* ref not defined in this section *) Some (req,l))
| ImplConstant (con,flags) ->
(try
let con' = pop_con con in
let vars,_,_ = section_segment_of_constant con in
let extrastrict, extra_impls = impls_of_context vars in
let oldstrict,oldimpls = snd (List.hd l) in
let newstrict = extrastrict @ oldstrict in
let newimpls = List.map (add_section_impls vars extra_impls) oldimpls in
let l' = [ConstRef con',(newstrict,newimpls)] in
Some (ImplConstant (con',flags),l')
with Not_found -> (* con not defined in this section *) Some (req,l))
| ImplMutualInductive (kn,flags) ->
(try
let l' = List.map (fun (gr, (newstrict,l)) ->
let vars = section_segment_of_reference gr in
let extrastrict, extra_impls = impls_of_context vars in
let newstrict = extrastrict @ newstrict in
let newimpls = List.map (add_section_impls vars extra_impls) l in
((if isVarRef gr then gr else pop_global_reference gr),
(newstrict,newimpls))) l
in
Some (ImplMutualInductive (pop_kn kn,flags),l')
with Not_found -> (* ref not defined in this section *) Some (req,l))
let rebuild_implicits (req,l) =
match req with
| ImplLocal -> assert false
| ImplConstant (con,flags) ->
let _,oldimpls = snd (List.hd l) in
let newstrict,newimpls = compute_constant_implicits flags [] con in
req, [ConstRef con, (newstrict,List.map2 merge_impls oldimpls newimpls)]
| ImplMutualInductive (kn,flags) ->
let newimpls = compute_all_mib_implicits flags [] kn in
let rec aux olds news =
match olds, news with
| (_, (_,oldimpls)) :: old, (gr, (newstrict,newimpls)) :: tl ->
(gr, (newstrict,List.map2 merge_impls oldimpls newimpls))
:: aux old tl
| [], [] -> []
| _, _ -> assert false
in req, aux l newimpls
| ImplInteractive (ref,flags,o) ->
(if isVarRef ref && is_in_section ref then ImplLocal else req),
match o with
| ImplAuto ->
let _,oldimpls = snd (List.hd l) in
let newstrict,newimpls = compute_global_implicits flags [] ref in
[ref,(newstrict,List.map2 merge_impls oldimpls newimpls)]
| ImplManual userimplsize ->
let _,oldimpls = snd (List.hd l) in
let newstrict,newimpls = compute_global_implicits flags [] ref in
let newimpls = List.hd newimpls in
if flags.auto then
let p = List.length (snd newimpls) - userimplsize in
let newimpls = on_snd (List.firstn p) newimpls in
[ref,(newstrict,List.map (fun o -> merge_impls o newimpls) oldimpls)]
else
[ref,(newstrict,oldimpls)]
let classify_implicits (req,_ as obj) = match req with
| ImplLocal -> Dispose
| _ -> Substitute obj
type implicits_obj =
implicit_discharge_request *
(global_reference *
(implicit_explanation option list * implicits_list list)) list
let inImplicits : implicits_obj -> obj =
declare_object {(default_object "IMPLICITS") with
cache_function = cache_implicits;
load_function = load_implicits;
subst_function = subst_implicits;
classify_function = classify_implicits;
discharge_function = discharge_implicits;
rebuild_function = rebuild_implicits }
let is_local local ref = local || isVarRef ref && is_in_section ref
let declare_implicits_gen req flags ref =
let imps = compute_global_implicits flags [] ref in
add_anonymous_leaf (inImplicits (req,[ref,imps]))
let declare_implicits local ref =
let flags = { !implicit_args with auto = true } in
let req =
if is_local local ref then ImplLocal else ImplInteractive(ref,flags,ImplAuto) in
declare_implicits_gen req flags ref
let declare_var_implicits id =
let flags = !implicit_args in
declare_implicits_gen ImplLocal flags (VarRef id)
let declare_constant_implicits con =
let flags = !implicit_args in
declare_implicits_gen (ImplConstant (con,flags)) flags (ConstRef con)
let declare_mib_implicits kn =
let flags = !implicit_args in
let imps = Array.map_to_list
(fun (ind,cstrs) -> ind::(Array.to_list cstrs))
(compute_mib_implicits flags [] kn) in
add_anonymous_leaf
(inImplicits (ImplMutualInductive (kn,flags),List.flatten imps))
(* Declare manual implicits *)
type manual_explicitation = Constrexpr.explicitation * (bool * bool * bool)
type manual_implicits = manual_explicitation list
let compute_implicits_with_manual env typ enriching l =
let _,autoimpls = compute_auto_implicits env !implicit_args enriching typ in
set_manual_implicits env !implicit_args enriching autoimpls l
let check_inclusion l =
(* Check strict inclusion *)
let rec aux = function
| n1::(n2::_ as nl) ->
if n1 <= n2 then
error "Sequences of implicit arguments must be of different lengths";
aux nl
| _ -> () in
aux (List.map (fun (imps,_) -> List.length imps) l)
let check_rigidity isrigid =
if not isrigid then
errorlabstrm "" (strbrk "Multiple sequences of implicit arguments available only for references that cannot be applied to an arbitrarily large number of arguments.")
let projection_implicits env p impls =
let pb = Environ.lookup_projection p env in
CList.skipn_at_least pb.Declarations.proj_npars impls
let declare_manual_implicits local ref ?enriching l =
let flags = !implicit_args in
let env = Global.env () in
let t = Global.type_of_global_unsafe ref in
let enriching = Option.default flags.auto enriching in
let isrigid,autoimpls = compute_auto_implicits env flags enriching t in
let l' = match l with
| [] -> assert false
| [l] ->
[DefaultImpArgs, set_manual_implicits env flags enriching autoimpls l]
| _ ->
check_rigidity isrigid;
let l = List.map (fun imps -> (imps,List.length imps)) l in
let l = List.sort (fun (_,n1) (_,n2) -> n2 - n1) l in
check_inclusion l;
let nargs = List.length autoimpls in
List.map (fun (imps,n) ->
(LessArgsThan (nargs-n),
set_manual_implicits env flags enriching autoimpls imps)) l in
let strictimpls = compute_implicits_strict env t in
let req =
if is_local local ref then ImplLocal
else ImplInteractive(ref,flags,ImplManual (List.length autoimpls))
in
add_anonymous_leaf (inImplicits (req,[ref,(strictimpls,l')]))
let maybe_declare_manual_implicits local ref ?enriching l =
match l with
| [] -> ()
| _ -> declare_manual_implicits local ref ?enriching [l]
let extract_impargs_data impls =
let rec aux p = function
| (DefaultImpArgs, imps)::_ -> [None,imps]
| (LessArgsThan n, imps)::l -> (Some (p,n),imps) :: aux (n+1) l
| [] -> [] in
aux 0 impls
let lift_implicits n =
List.map (fun x ->
match fst x with
ExplByPos (k, id) -> ExplByPos (k + n, id), snd x
| _ -> x)
let make_implicits_list l = [DefaultImpArgs, l]
let rec drop_first_implicits p l =
if Int.equal p 0 then l else match l with
| _,[] as x -> x
| DefaultImpArgs,imp::impls ->
drop_first_implicits (p-1) (DefaultImpArgs,impls)
| LessArgsThan n,imp::impls ->
let n = if is_status_implicit imp then n-1 else n in
drop_first_implicits (p-1) (LessArgsThan n,impls)
let rec select_impargs_size n = function
| [] -> [] (* Tolerance for (DefaultImpArgs,[]) *)
| [_, impls] | (DefaultImpArgs, impls)::_ -> impls
| (LessArgsThan p, impls)::l ->
if n <= p then impls else select_impargs_size n l
let select_stronger_impargs = function
| [] -> [] (* Tolerance for (DefaultImpArgs,[]) *)
| (_,impls)::_ -> impls
|