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hb.elpi
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hb.elpi
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% A mterm is always of the form [mtrm ML F], which is a pair of
% a list of mixins ML that should be substituted in F and a term F
kind mterm type.
type mtrm list @mixinname -> term -> mterm.
% Notations /à la/ *pack* are always of the shape
% [Notation N x_0 .. x_n := C x_0 .. _ _ id .. x_i .. _ id _ _ id]
% with a variable number of [_] between each [id], and where
% - [x_i] is given by the user
% - [_] correspond to arguments that are left implicit,
% - [id] trigger unification as described in
% /Canonical Structures for the working Coq user/ by Mahboubi and Tassi
%
% phant-arg encode these three kind of arguments
% - [x_i] is encoded using [real-arg x_i]
% - [_] using [implicit-arg]
% - [id] using [unify-arg]
kind phant-arg type.
type real-arg @name -> phant-arg.
type implicit-arg phant-arg.
type unify-arg phant-arg.
% phant-term is a pair of a list of argument kinds together with a term
kind phant-term type.
type phant-trm list phant-arg -> term -> phant-term.
%%%%%% Specialize coq.elpi.accumulate to "hiearchy.db" %%%%%%%%%%%%%%%%%%%
pred acc i:scope, i:clause.
acc S CL :- coq.elpi.accumulate S "hb.db" CL.
% factory, generated mixin, mean, eg mean : factory -> mixin
pred extract-mix i:prop, o:@mixinname.
extract-mix (from _ X _) X.
% [factory-fun->term T Src Tgt MF] provides a term which is
% a function to transform Src into Tgt under the right mixin-src.
pred factory-fun->term i:term, i:@factoryname, i:@mixinname, o:term.
factory-fun->term T Src Tgt FT :- !, std.do! [
from Src Tgt F, factory-requires Src ML, mterm->term T (mtrm ML F) FT].
% [factory-provides F ML] states that the factory ML
% provides instances of ML
pred factory-provides i:@factoryname, o:list @mixinname.
factory-provides Factory ML :- std.do! [
std.findall (from Factory T_ F_) All,
std.map All extract-mix ML,
].
% TODO: generalize/rename when we support parameters
pred argument->gref i:argument, o:gref.
argument->gref (str S) GR :- !, std.assert! (coq.locate S GR) "cannot locate a factory".
argument->gref X _ :- coq.error "not a string:" X.
pred argument->term i:argument, o:term.
argument->term (str S) (global GR) :- !, std.assert! (coq.locate S GR) "cannot locate a factory".
argument->term (trm T) T :- !, std.assert! (coq.typecheck T _) "not well typed term".
argument->term X _ :- coq.error "not a term:" X.
% TODO: document
pred mk-mixin-provided-by i:@factoryname, i:list @mixinname, o:list prop.
mk-mixin-provided-by F ML CL :-
std.map ML (x\r\ r = factories-provide-mixins.mixin-provided-by F x) CL.
pred factories-provide-mixins.mixin-provided-by i:@mixinname, o:@factoryname.
pred factories-provide-mixins i:list @factoryname, o:list @mixinname, o:list prop.
factories-provide-mixins GRFS ML Clauses :- std.do! [
std.map GRFS factory-provides MLUnsortedL,
std.map2 GRFS MLUnsortedL mk-mixin-provided-by PL,
std.flatten PL Clauses,
std.flatten MLUnsortedL MLUnsorted,
toposort-mixins MLUnsorted ML,
].
%%%%% Topological sortiing algorithm %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% TODO: pred toposort i:(A -> A -> prop), i:list A, o:list A.
% pred edge? i:int, i:int.
% toposort edge? [1,2,3,4] TopoList
pred topovisit i: list (pair A A), i: A, i: list A, i: list A, o: list A, o: list A.
topovisit _ X VS PS VS PS :- std.mem PS X, !.
topovisit _ X VS _ _ _ :- std.mem VS X, !, print "cycle detected.", fail.
topovisit ES X VS PS VS' [X|PS'] :-
toporec ES {std.map {std.filter ES (e\ fst e X)} snd} [X|VS] PS VS' PS'.
pred toporec i: list (pair A A), i: list A, i: list A, i: list A, o: list A, o: list A.
toporec _ [] VS PS VS PS.
toporec ES [X|XS] VS PS VS'' PS'' :-
topovisit ES X VS PS VS' PS', toporec ES XS VS' PS' VS'' PS''.
pred toposort i: list (pair A A), i: list A, o: list A.
toposort ES XS XS'' :-
toporec ES XS [] [] _ XS',
std.filter XS' (std.mem XS) XS''.
pred mk-mixin-edge i:prop, o:list (pair @mixinname @mixinname).
mk-mixin-edge (factory-requires M Deps) L :-
std.map Deps (d\r\ r = pr d M) L.
pred toposort-mixins i:list @mixinname, o:list @mixinname.
toposort-mixins In Out :- std.do! [
std.findall (factory-requires M_ Deps_) AllMixins,
std.flatten {std.map AllMixins mk-mixin-edge} ES,
toposort ES In Out,
].
pred mk-class-edge i:prop, o:pair class class.
mk-class-edge (sub-class C1 C2) (pr C2 C1).
pred toposort-classes i:list class, o:list class.
toposort-classes In Out :- std.do! [
std.findall (sub-class C1_ C2_) SubClasses,
std.map SubClasses mk-class-edge ES,
toposort ES In Out,
].
pred findall-classes o:list class.
findall-classes CLSorted :- std.do! [
std.findall (class-def C_) All,
std.map All (x\r\ x = class-def r) CL,
toposort-classes CL CLSorted
].
%%%%% Utils %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [get-structure-coercion S1 S2 F] finds the coecion F from the structure S1 to S2
pred get-structure-coercion i:@structure, i:@structure, o:term.
get-structure-coercion (global S) (global T) (global F) :-
coq.coercion.db-for (grefclass S) (grefclass T) L,
if (L = [pr F 0]) true (coq.error "No one step coercion from" S "to" T).
pred get-structure-sort-projection i:@structure, o:term.
get-structure-sort-projection (global (indt S)) (global (const P)) :-
coq.CS.canonical-projections S L,
if (L = [some P, _]) true (coq.error "No canonical sort projection for" S).
pred get-structure-class-projection i:@structure, o:term.
get-structure-class-projection (global (indt S)) (global (const P)) :-
coq.CS.canonical-projections S L,
if (L = [_, some P]) true (coq.error "No canonical class projection for" S).
pred get-structure-constructor i:@structure, o:term.
get-structure-constructor (global (indt S)) (global (indc K)) :-
if (coq.env.indt S _ 0 0 _ [K] _) true (coq.error "Not a packed structure" S).
pred get-class-constructor i:@classname, o:term.
get-class-constructor (indt S) (global (indc K)) :-
if (coq.env.indt S _ 1 1 _ [K] _) true (coq.error "Not a class" S).
pred gref->modname i:@mixinname, o:@id.
gref->modname GR ModName :-
coq.gr->path GR Path,
if (std.rev Path [_,ModName|_]) true (coq.error "No enclosing module for " GR).
pred term->modname i:@structure, o:@id.
term->modname T ModName :- gref->modname {term->gr T} ModName.
% [instanciate-mixin T F M_i TFX] where mixin-for T M_i X_i states that
% if F ~ fun xs (m_0 : M_0 T) .. (m_n : M_n T ..) ys
% => F xs m_0 .. m_{i-1} m_i m_{i+1} .. m_n ys
% then TFX := fun xs m_0 .. m_{i-1} m_{i+1} .. m_n ys
% => F xs m_0 .. m_{i-1} X_i m_{i+1} .. m_n ys
% thus instanciating an abstraction on mixin M_i with X_i
pred instanciate-mixin i:term, i:@mixinname, i:term, o:term.
instanciate-mixin T M (fun _ Tm F) (F X) :-
safe-dest-app Tm (global TmGR) _,
factory-alias TmGR M, !,
mixin-for T M X, !.
instanciate-mixin T M (fun N T F) (fun N T FX) :- !, pi m\ instanciate-mixin T M (F m) (FX m).
instanciate-mixin _ _ F F.
% [mterm->term T MF TFX] assumes that MF is a mterm
% (mtrm ML F) and perform the substitution as above
% for every mixin-for entry out of the list ML = [M_0, .., M_n].
pred mterm->term i:term, i:mterm, o:term.
mterm->term T (mtrm ML F) SFX :- std.do![
coq.typecheck F Ty,
mk-eta (-1) Ty F EtaF,
subst-fun [T] EtaF FT,
std.fold ML FT (instanciate-mixin T) SFX
].
% [mgref->term T GR X] computes the dependencies of GR in mixins,
% (through factory-requires if it exist, otherwise gr-deps)
% and instanciates all of them through mixin-src, and fails if it cannot.
pred mgref->term i:term, i:gref, o:term.
mgref->term T GR X :- factory-requires GR ML, !, mterm->term T (mtrm ML (global GR)) X.
mgref->term T GR X :- !, gr-deps GR ML, !, mterm->term T (mtrm ML (global GR)) X.
% [mixin-srcs T X MSL] states that MSL is a list of [mixin-src T m X]
% where m ranges all the mixins that the factory Src can provide,
% where Src is the type of X.
pred mixin-srcs i:term, i:term, o:list prop.
mixin-srcs T X MSL :- std.do! [
coq.typecheck X XTy,
term->gr XTy Src,
factory-alias Src Factory,
factory-provides Factory ML,
% TODO: skip mixins for which there is already a source.
std.map ML (m\r\ r = mixin-src T m X) MSL
].
% [mixin-for T M X] states that X has type [M T ...]
% it is reconstructed from two databases [mixin-src] and [from]
pred mixin-for o:term, o:@mixinname, o:term.
mixin-for T M MI :- mixin-src T M Tm, !, std.do! [
coq.typecheck Tm Ty,
term->gr Ty Src,
factory-alias Src Factory,
if (M = Factory) (MI = Tm) (
factory-fun->term T Factory M F,
subst-fun [Tm] F MI
)
].
%% finding for locally defined structures
pred cs-structure i:cs-instance, o:term.
cs-structure (cs-instance _ _ (global Inst)) Struct :- std.do! [
coq.env.typeof-gr Inst InstTy,
safe-dest-app InstTy Struct _
].
pred has-cs-instance i:gref, i:cs-instance.
has-cs-instance GTy (cs-instance _ (cs-gref GTy) _).
pred local-structures i:term, o:list term.
local-structures TyTrm StructL :- std.do! [
std.filter {coq.CS.db} (has-cs-instance {term->gr TyTrm}) DBGTyL,
std.map DBGTyL cs-structure StructL,
].
pred local-structure i:term, i:term.
local-structure TyTerm Struct :-
local-structures TyTerm StructL,
std.mem! StructL Struct.
%%%%%%% Finding and instantiating mixin arguments%%%%%%%%%%%%%%%%%%%%%%%%%%
% [ty-deps Ty ML] states that ML is the list of
% mixins which the type Ty rely on, i.e.
% Ty = forall (m_0 : M_0 T) ... (m_n : M_n T ..), _ and ML = [M_0, .., M_n]
pred ty-deps i:term, o:list @mixinname.
ty-deps (prod N S R) ML' :- !,
@pi-decl N S x\
ty-deps (R x) ML,
safe-dest-app S HD _,
if (HD = global GR, factory-alias GR F, from _ F _, !)
(ML' = [F|ML]) (ML' = ML).
ty-deps Ty ML :- whd1 Ty Ty1, !, ty-deps Ty1 ML.
ty-deps _Ty [].
% [term-deps T ML] states that ML is the list of
% mixins which the term T rely on, i.e. T has type
% forall (m_0 : M_0 T) ... (m_n : M_n T ..), _ and ML = [M_0, .., M_n]
pred term-deps i:term, o:list @mixinname.
term-deps T ML :- coq.typecheck T Ty, ty-deps Ty ML.
% shorthand for gref.
pred gr-deps i:gref, o:list @mixinname.
gr-deps GR ML :- term-deps (global GR) ML.
% [find-max-classes Mixins Classes] states that Classes is a list of classes
% which contain all the mixins in Mixins.
% Although it is not strictly necessary, but desirable for debugging,
% we use a heuristic that tries to minimize the number
% of classes by assuming Mixins are reversed topologically sorted.
pred find-max-classes i:list @mixinname, o:list @classname.
find-max-classes [] [].
find-max-classes [M|Mixins] [C|Classes] :-
mixin-first-class M C,
std.do! [
class-def (class C _ ML),
std.filter Mixins (x\ not (std.mem! ML x)) Mixins',
find-max-classes Mixins' Classes
].
find-max-classes [M|_] _ :- coq.error "cannot find a class containing mixin" M.
% [under-mixins T ML Pred F] states that F has type
% fun (m_0 : M_0 T) .. (m_n : M_n T m_i0 .. m_ik) => Body m_0 .. m_n
% where ML = [M_0, .., M_n]
% and Body is such that [..,mixin-src T M_i m_i,..] => Pred Body
pred under-mixins i:term, i:list gref, i:(term -> prop), o:term.
under-mixins _T [] Pred Body :- !, Pred Body.
under-mixins T [M|ML] Pred (fun `m` MTy FLG) :- std.do! [
mgref->term T M MTy,
@pi-decl `m` MTy m\ mixin-src T M m => under-mixins T ML Pred (FLG m)
].
% A *pack* notation can be easiliy produced from a phant-term using
% [mk-phant-abbrev N PT C], which states that C is a new constant
% which name is phant_N, and which produces a simple notation
% with name N using the data of the phant-term PT to reconstruct a notation
% [Notation N x0 .. xn := C x0 _ _ id .. xi .. _ id _ _ id]
% as described above.
pred mk-phant-abbrev.term i:int, i:term, i:list phant-arg, o:int, o:term.
mk-phant-abbrev.term K F [] K F.
mk-phant-abbrev.term K F [real-arg N|AL] K'' (fun N _ AbbrevFx) :- !,
pi x\ mk-phant-abbrev.term K {mk-app F [x]} AL K' (AbbrevFx x),
K'' is K' + 1.
mk-phant-abbrev.term K F [implicit-arg|AL] K' FAbbrev :- !,
mk-phant-abbrev.term K {mk-app F [_]} AL K' FAbbrev.
mk-phant-abbrev.term K F [unify-arg|AL] K' FAbbrev :- !,
mk-phant-abbrev.term K {mk-app F [{{lib:@hb.id _ _}}]} AL K' FAbbrev.
pred mk-phant-abbrev i:string, i:phant-term, o:@constant.
mk-phant-abbrev N (phant-trm AL T) C :- std.do! [
NC is "phant_" ^ N,
coq.typecheck T _TTy,
coq.env.add-const NC T _ ff ff C,
mk-phant-abbrev.term 0 (global (const C)) AL NParams Abbrev,
coq.notation.add-abbreviation N NParams Abbrev tt ff
].
% [acc-factory-aliases GR] makes a phantom abbreviation for F
pred acc-factory-aliases i:gref, o:list prop.
acc-factory-aliases GR [] :- factory-alias GR _, !.
acc-factory-aliases GR Aliases :- !,
mk-phant-mixins (global GR) PhGR,
PhantAbbrevName is "axioms_",
mk-phant-abbrev PhantAbbrevName PhGR PhC,
Aliases = [factory-alias GR GR, factory-alias (const PhC) GR].
% [mk-phant-unify X1 X2 PF PUF] states that PUF is a phant-term that
% is starts with unifing X1 and X2 and then outputs PF.
pred mk-phant-unify i:term, i:term, i:phant-term, o:phant-term.
mk-phant-unify X1 X2 (phant-trm AL F) (phant-trm [unify-arg|AL] UF) :-
UF = {{fun u : lib:hb.unify lp:X1 lp:X2 lib:hb.none => lp:F}}.
% [mk-phant-implicit N Ty PF PUF] states that PUF is a phant-term
% which quantifies [PF x] over [x : Ty] (with name N)
pred mk-phant-implicit i:@name, i:term, i:(term -> phant-term), o:phant-term.
mk-phant-implicit N Ty PF (phant-trm [implicit-arg|AL] (fun N Ty F)) :- !,
pi t\ PF t = phant-trm AL (F t).
% [mk-phant-struct T SI PF PSF] states that PSF is a phant-term
% which postulate a structure [s : SI] such that [T = sort s]
% and then outputs [PF s]
pred mk-phant-struct i:term, i:term, i:(term -> phant-term), o:phant-term.
mk-phant-struct T SI PF (phant-trm [implicit-arg, unify-arg|AL] UF) :-
get-structure-sort-projection SI Sort,
pi s\ PF s = phant-trm AL (F s),
UF = {{fun (s : lp:SI) (u : lib:hb.unify lp:T (lp:Sort s)
(lib:hb.some (lib:hb.pair "is not canonically a"%string lp:SI)))
=> lp:(F s)}}.
% [mk-phant-struct T CN PF PCF] states that PSF is a phant-term
% which postulate a structure [s : SI] such that [T = sort s]
% and a class [c : CN T] such that [s = CK T c] and then outputs [PF c]
pred mk-phant-class i:term, i:@classname, i:(term -> phant-term), o:phant-term.
mk-phant-class T CN PF PSF :-
class-def (class CN SI _CML), get-structure-constructor SI SK,
PSF = {mk-phant-struct T SI s\
{mk-phant-implicit `c` (app [global CN, T]) c\
{mk-phant-unify s (app [SK, T, c]) (PF c)} } }.
% [mk-phant-mixins F PF] states that if F = fun T m_0 .. m_n => _
% then PF = phant-term
% [real-arg T, implicit-arg, unify-arg, implicit-arg, unify-arg,
% implicit-arg, .., implicit-arg, unify-arg, ...,
% implicit-arg, unify-arg, implicit-arg, unify-arg,
% implicit-arg, .., implicit-arg, unify-arg]
% {{fun T => [find s_0 | T ~ s_0] [find c_0 | s_0 ~ SK T c_0]
% [find m_0_0, .., m_0_n0 | c_0 ~ CK m_0_0 .. m_0_n0] ...
% [find s_k | T ~ s_k] [find c_k | s_k ~ SK T c_k]
% [find m_k_0, .., m_k_nk | c_k ~ CK m_k_0 .. m_k_nk]
% F T m_i0_j0 .. m_il_jl}}
pred mk-phant-mixins.class-mixins i:term, i:@classname, i:term,
i:list @mixinname, i:phant-term, o:phant-term.
mk-phant-mixins.class-mixins T CN C [] PF UPF :- !, std.do![
get-class-constructor CN K, class-def (class CN _ CML),
mterm->term T (mtrm CML K) KCML,
mk-phant-unify C KCML PF UPF].
mk-phant-mixins.class-mixins T CN C [M|ML] (phant-trm AL FMML) LamPFmmL :- !,
mgref->term T M MTy,
(@pi-decl `m` MTy m\ mixin-src T M m => sigma FmML\
instanciate-mixin T M FMML FmML,
mk-phant-mixins.class-mixins T CN C ML (phant-trm AL FmML) (PFmmL m)),
mk-phant-implicit `m` MTy PFmmL LamPFmmL.
pred mk-phant-mixins.class i:term, i:@classname, i:phant-term, o:phant-term.
mk-phant-mixins.class T CN PF SCF :- !,
class-def (class CN _SI CML),
SCF = {mk-phant-class T CN c\ {mk-phant-mixins.class-mixins T CN c CML PF} }.
pred mk-phant-mixins i:term, o:phant-term.
mk-phant-mixins F (phant-trm [real-arg T|AL] (fun T _ CFML)) :- std.do! [
coq.typecheck F FTy,
ty-deps FTy ML,
mk-eta (-1) FTy F EtaF,
% toposort-mixins ML MLSorted,
ML = MLSorted, % Assumes we give them already sorted in dep order.
std.rev MLSorted MLSortedRev,
find-max-classes MLSortedRev CNL,
(@pi-decl T {{Type}} t\ sigma FML PML\
std.fold CNL (phant-trm [] {subst-fun [t] EtaF}) (mk-phant-mixins.class t)
(phant-trm AL (CFML t)))
].
% Given a type T, a list of class definition in topological order (from least dep to most)
% it consumes the list all the classes for which all the dependencies
% (mixins) were postulated so far (skips the rest) and declares a local
% constant inhabiting the corresponding structure and declares it canonical.
pred declare-instances i:term, i:list class.
declare-instances T [class Class Struct ML|Rest] :-
get-class-constructor Class KC,
mterm->term T (mtrm ML KC) KCApp, % we can build it
not (local-structure T Struct), % not already built
!,
Name is "struct_" ^ {term->modname Struct},
get-structure-constructor Struct KS,
S = app[KS, T, KCApp],
coq.typecheck S STy,
coq.env.add-const Name S STy ff ff CS, % Bug coq/coq#11155, could be a Let
coq.CS.declare-instance (const CS), % Bug coq/coq#11155, should be local
declare-instances T Rest.
declare-instances T [_|Rest] :- declare-instances T Rest.
declare-instances _ [].
pred main-factory-requires i:gref, i:list @factoryname, o:list prop.
main-factory-requires GR GRFS [FactoryRequires|Aliases] :- !, std.do! [
factories-provide-mixins GRFS ML _,
FactoryRequires = factory-requires GR ML,
acc-factory-aliases GR Aliases
].
pred main-mixin-requires i:gref, i:list @factoryname, o:list prop.
main-mixin-requires GR GRFS [From|PO] :- !, std.do! [
main-factory-requires GR GRFS PO,
% register factory
PO => std.do! [
coq.env.typeof-gr GR (prod T TTy _),
@pi-decl T TTy t\ under-mixins t {factory-requires GR} (body\ sigma MTy\
mgref->term t GR MTy,
body = fun `x` MTy x\x) (IDBody t)],
From = from GR GR (fun T TTy IDBody),
].
% Given a type T, a fresh number N, and a mixin M it postulates
% a variable "mN" inhabiting M applied to T and
% all its dependencies, previously postulated and associated
% to the corresponding mixin using mixin-for
pred postulate-mixin i:term, i:@mixinname, i:list prop, o:list prop.
postulate-mixin T M MSL [mixin-src T M (global (const C))|MSL] :- MSL => std.do! [
mgref->term T M Ty,
Name is "mixin_" ^ {gref->modname M},
coq.typecheck Ty _,
coq.env.add-const Name _ Ty tt tt C % no body, local -> a variable
].
pred main-declare-context i:term, i:list @factoryname.
main-declare-context T GRFS :- std.do! [
factories-provide-mixins GRFS ML _,
std.fold ML [] (postulate-mixin T) MSL,
MSL => declare-instances T {findall-classes},
std.forall MSL (ms\ acc current (clause _ _ ms)),
].
pred gather-last-product i:term, i:option term, o:@factoryname, o:@mixinname.
gather-last-product T Last R1 R2 :- whd1 T T1, !, % unfold the type
gather-last-product T1 Last R1 R2.
gather-last-product (prod N Src Tgt) _ R1 R2 :- !,
pi x\
decl x N Src =>
gather-last-product (Tgt x) (some Src) R1 R2.
gather-last-product End (some Last) LastGR EndGR :-
term->gr End EndGR, term->gr Last LastGR.
pred factory-comp i:term, i:gref, i:mterm, i:gref, i:gref, o:term.
factory-comp T Src MF Mid Tgt (fun `src` SrcTy GoF) :- !, std.do![
mgref->term T Src SrcTy,
@pi-decl `src` SrcTy src\ sigma MSL G F\
mixin-srcs T src MSL, !,
MSL => (std.do! [
factory-fun->term T Mid Tgt G,
mterm->term T MF F,
subst-fun [{subst-fun [src] F}] G (GoF src)
])
].
% [declare-factory-from ML Src F Mid Tgt FromI FromO]
% declares a factory by composing F and G.
pred declare-factory-from
i:gref, i:term, i:gref, i:gref, i:list prop, o:list prop.
declare-factory-from Src F Mid Tgt FromI [NewFrom|FromI]
:- !, FromI => std.do! [
coq.typecheck F (prod TName TTy _),
factory-requires Src ML,
(@pi-decl TName TTy t\
under-mixins t ML (factory-comp t Src (mtrm ML F) Mid Tgt) (GoFt t)
),
GoF = fun TName TTy GoFt,
coq.typecheck GoF _GoFTy,
Name is {gref->modname Src} ^ "_to_" ^ {gref->modname Tgt},
coq.env.add-const Name GoF _GoFTy ff ff GoFC,
NewFrom = from Src Tgt (global (const GoFC)),
].
pred main-declare-factory-fun i:term, i:list prop, o:list prop.
main-declare-factory-fun F PI PO :- !, std.do! [
PI => std.do! [
coq.typecheck F Ty,
gather-last-product Ty none Src MidAlias,
factory-requires Src ML,
factory-alias MidAlias Mid,
factory-provides Mid AllTgts,
std.filter AllTgts (t\ not (std.mem! ML t)) Tgts,
],
std.fold Tgts PI (declare-factory-from Src F Mid) PO,
].
% [export Module] exports a Module now adds it to the collection of
% modules to export in the end
pred export i:@modpath.
export Module :- !,
coq.env.export-module Module,
acc current (clause _ _ (to-export Module)).
pred mk-mlams i:term, i:list @mixinname, i:term, o:term.
mk-mlams T ML X MLX :- under-mixins T ML (body\ body = X) MLX.
pred exported-op o:@constant, o:@constant.
% given an operation (a mixin projection) we generate a constant projection the
% same operation out of the package structure (out of the class field of the
% structure). We also provide all the other mixin dependencies (other misins)
% of the package structure.
pred export-1-operation i:term, i:term, i:term, i:option @constant, i:list prop, o:list prop.
export-1-operation _ _ _ none EX EX :- !. % not a projection, no operation
export-1-operation Struct Psort Pclass (some Poperation) EXI EXO :- !, std.do! [
coq.gr->id (const Poperation) Name,
(@pi-decl `s` Struct s\ sigma Carrier Class MSL DirtyTy Copies\ std.do! [
Carrier = app[Psort, s],
Class = app[Pclass, s],
mixin-srcs Carrier Class MSL,
MSL => mgref->term Carrier (const Poperation) (Body s),
coq.typecheck (Body s) DirtyTy,
% makes the type of T nicer.
std.map EXI (x\r\ sigma Po C ML EtaC\
x = exported-op Po C,
gr-deps (const Po) ML,
mk-mlams Carrier ML (app [global (const C), s]) EtaC,
% TODO: optimze by populating exported-op with EtaC : term -> term instead of C
r = pi rest\ copy (app [global (const Po), _|rest]) (app [EtaC|rest])) Copies,
Copies => copy DirtyTy (BodyTy s)
]
),
T = fun `x` Struct Body,
Ty = prod `x` Struct BodyTy,
coq.env.add-const Name T Ty ff ff C,
coq.arguments.set-implicit (const C) [[maximal]] tt,
EXO = [exported-op Poperation C|EXI]
].
% Given a list of mixins, it exports all operations in there
pred export-operations.aux i:term, i:term, i:term, i:list @mixinname.
export-operations.aux _ _ _ [].
export-operations.aux Struct ProjSort ProjClass [indt M|ML] :- !, std.do! [
coq.CS.canonical-projections M Poperations,
std.fold Poperations [] (export-1-operation Struct ProjSort ProjClass) _,
export-operations.aux Struct ProjSort ProjClass ML
].
export-operations.aux Struct ProjSort ProjClass [GR|ML] :-
coq.say GR "is not a record: skipping operations factory this mixin",
export-operations.aux Struct ProjSort ProjClass ML.
pred export-operations i:term, i:term, i:term, i:list @mixinname, o:list @mixinname.
export-operations Structure ProjSort ProjClass ML MLToExport :-
std.filter ML (m\not(mixin-first-class m _)) MLToExport,
export-operations.aux Structure ProjSort ProjClass MLToExport.
% [declare-coercion P1 P2 C1 C2] declares a structure and a class coercion
% from C1 to C2 given P1 P2 the two projections from the structure of C1
pred declare-coercion i:term, i:term, i:class, i:class.
declare-coercion SortProjection ClassProjection
(class FC StructureF _ as FCDef) (class TC StructureT TML as TCDef) :- std.do! [
acc current (clause _ _ (sub-class FCDef TCDef)),
term->modname StructureF ModNameF,
term->modname StructureT ModNameT,
CName is ModNameF ^ "_class_to_" ^ ModNameT ^ "_class",
SName is ModNameF ^ "_to_" ^ ModNameT,
std.map TML (from FC) FC2TML,
get-class-constructor TC KC,
Class = global FC,
(pi T c\ sigma Mixes\
std.map FC2TML (p\r\ r = app[p, T, c]) Mixes,
ClassCoercion T c = app[KC, T | Mixes]),
CoeBody = {{ fun (T : Type) (c : lp:Class T) => lp:(ClassCoercion T c) }},
coq.typecheck CoeBody Ty,
coq.env.add-const CName CoeBody Ty ff ff C,
coq.coercion.declare (coercion (const C) 1 FC (grefclass TC)) tt,
get-structure-constructor StructureT Pack,
Coercion = global (const C),
SCoeBody = {{ fun s : lp:StructureF =>
let T : Type := lp:SortProjection s in
lp:Pack T (lp:Coercion T (lp:ClassProjection s)) }},
coq.typecheck SCoeBody STy,
coq.env.add-const SName SCoeBody STy ff ff SC,
coq.coercion.declare (coercion (const SC) 0 {term->gr StructureF} (grefclass {term->gr StructureT})) tt,
coq.CS.declare-instance (const SC), % TODO: API in Elpi, take a @constant instead of gref
].
pred sub-class? i:class, i:class.
sub-class? (class _ _ ML1) (class _ _ ML2) :-
std.forall ML2 (m2\ std.exists ML1 (m1\ m1 = m2)).
% we try to find C1 and C2 such that C1 != C2... TODO document together with findall helper down below
pred distinct-pairs i:class, i:list class, o:class, o:class.
distinct-pairs CurrentClass AllSuper C1 C2 :-
std.mem AllSuper C1, std.mem AllSuper C2,
std.do! [
cmp_term C1 C2 lt,
C1 = class C1n _ _,
C2 = class C2n _ _ ,
not(sub-class? C1 C2),
not(sub-class? C2 C1),
if (join C1n C2n C3n)
(class-def (class C3n X Y),
std.assert! (sub-class? CurrentClass (class C3n X Y)) "You must declare this class before C3 TODO",
fail)
true,
].
pred findall-newjoins i:class, i:list class, o:list (pair class class).
findall-newjoins CurrentClass AllSuper TodoJoins :-
std.findall (distinct-pairs CurrentClass AllSuper C1_ C2_) JoinOf,
pi project\
(pi x y c1 c2\ project (distinct-pairs x y c1 c2) (pr c1 c2)) =>
std.map JoinOf project TodoJoins.
pred declare-join i:class, i:pair class class, o:prop.
declare-join (class C3 S3 _) (pr (class C1 S1 _) (class C2 S2 _)) (join C1 C2 C3) :-
Name is {term->modname S1} ^ "_to_" ^ {term->modname S2},
get-structure-coercion S3 S2 S3_to_S2,
get-structure-coercion S3 S1 S3_to_S1,
get-structure-sort-projection S1 S1_sort,
get-structure-class-projection S2 S2_class,
get-structure-constructor S2 S2_Pack,
JoinBody = {{ fun s : lp:S3 =>
lp:S2_Pack (lp:S1_sort (lp:S3_to_S1 s))
(lp:S2_class (lp:S3_to_S2 s)) }},
coq.typecheck JoinBody Ty,
coq.env.add-const Name JoinBody Ty ff ff J,
coq.CS.declare-instance (const J).
% TODO: this works under the invariant: we never have two classes that
% contain exactly the same mixins. hb.structure should enforce this
% and eventually just alias the existing one rather than failing.
% TODO: hb.structure should check we are not inserting the class
% in the middle of existing ones. Possible fix: always declare all intermediate
% possibilities but without proper names (requires the previous TODO about
% aliasing already existing stuff).
pred declare-unification-hints i:term, i:term, i:class, o:list prop.
declare-unification-hints SortProj ClassProj CurrentClass NewJoins :- std.do! [
findall-classes All,
std.filter All (sub-class? CurrentClass) AllSuper,
std.forall AllSuper (declare-coercion SortProj ClassProj CurrentClass),
findall-newjoins CurrentClass AllSuper TodoJoins,
std.map TodoJoins (declare-join CurrentClass) NewJoins
].
% For each mixin we declare a field and apply the mixin to its dependencies
% (that are previously declared fields recorded via field-for-mixin)
pred synthesize-fields i:term, i:list @mixinname,o:record-decl.
synthesize-fields _T [] end-record.
synthesize-fields T [M|ML] (field ff Name MTy Fields) :- std.do! [
Name is {gref->modname M} ^ "_mixin",
mgref->term T M MTy,
@pi-decl `m` MTy m\ mixin-src T M m => synthesize-fields T ML (Fields m)
].
% Builds the axioms record and the factories from this class to each mixin
pred declare-class i:list @mixinname, o:@factoryname, o:list prop.
declare-class ML (indt ClassName) Factories :- std.do! [
(@pi-decl `T` {{Type}} t\ synthesize-fields t ML (RDecl t)),
ClassDeclaration =
(parameter `T` {{ Type }} t\
record "axioms" {{ Type }} "Axioms" (RDecl t)),
coq.typecheck-indt-decl ClassDeclaration,
coq.env.add-indt ClassDeclaration ClassName,
coq.CS.canonical-projections ClassName Projs,
std.map2 ML Projs (m\ p\ r\ sigma P\
p = some P,
r = from (indt ClassName) m (global (const P))) Factories,
].
% Builds the package record
pred declare-structure i:@factoryname, o:term, o:term, o:term.
declare-structure ClassName Structure SortProjection ClassProjection :- std.do! [
StructureDeclaration =
record "type" {{ Type }} "Pack" (
field ff "sort" {{ Type }} s\
field ff "class" (app [global ClassName, s]) _\
end-record),
coq.typecheck-indt-decl StructureDeclaration,
coq.env.add-indt StructureDeclaration StructureName,
coq.CS.canonical-projections StructureName [some SortP, some ClassP],
Structure = global (indt StructureName),
SortProjection = global (const SortP),
ClassProjection = global (const ClassP),
].
% Declares "sort" as a coercion Structurename >-> Sortclass
pred declare-sort-coercion i:term, i:term.
declare-sort-coercion (global StructureName) (global Proj) :-
coq.coercion.declare (coercion Proj 0 StructureName sortclass) tt.
pred main-declare-structure i:string, i:list gref.
main-declare-structure Module GRFS :- std.do! [
factories-provide-mixins GRFS ML _,
% TODO: avoid redefining the same class
% TODO: check we never define the superclass of an exising class
coq.env.begin-module Module none,
declare-class ML ClassName Factories,
ClassRequires = factory-requires (ClassName) [],
ClassAlias = (factory-alias ClassName ClassName),
declare-structure ClassName Structure SortProjection ClassProjection,
CurrentClass = (class ClassName Structure ML),
% Exports module
coq.env.begin-module "Exports" none,
declare-sort-coercion Structure SortProjection,
ClassAlias => ClassRequires => Factories =>
export-operations Structure SortProjection ClassProjection ML MLToExport,
ClassAlias => ClassRequires => Factories =>
declare-unification-hints SortProjection ClassProjection CurrentClass NewJoins,
% Register in Elpi's DB the new structure
% NOT TODO: All these acc are correctly locaed in an Export Module
std.forall MLToExport (m\
acc current (clause _ _ (mixin-first-class m ClassName))),
std.forall Factories (f\ acc current (clause _ _ f)),
acc current (clause _ _ ClassRequires),
acc current (clause _ _ ClassAlias),
std.forall NewJoins (j\ acc current (clause _ _ j)),
acc current (clause _ _ (class-def CurrentClass)),
coq.env.end-module Exports,
coq.env.end-module _,
export Exports,
].
pred canonical-mixins-of i:term, i:@structure, o:list prop.
canonical-mixins-of T S MSL :- std.do! [
get-structure-sort-projection S Sort,
coq.unify-eq T (app [Sort, ST]),
coq.unify-eq ST (app [_, _, C]),
C = app [_, _ | MIL],
std.map MIL (mixin-srcs T) MSLL,
std.flatten MSLL MSL
].
pred canonical-mixins i:term, o:list prop.
canonical-mixins T MSL :- std.do! [
local-structures T CS,
std.map CS (canonical-mixins-of T) MSLL,
std.flatten MSLL MSL,
].
pred mixin-src-name i:prop, o:@mixinname.
mixin-src-name (mixin-src _ M _) M.
pred main-begin-declare i:string, i:string, i:list gref, i:declaration.
main-begin-declare Module TName GRFS Decl :- std.do! [
coq.env.begin-module Module none,
coq.env.begin-section Module,
Ty = {{Type}}, coq.typecheck Ty _TyTy,
coq.env.add-const TName _ Ty tt tt T, % no body, local -> a variable
main-declare-context (global (const T)) GRFS,
acc current (clause _ _ (current-decl Decl))
].
pred map11 i:list A, i:list B,
i:(A -> B -> C -> prop), i:(A -> C -> prop), i:(B -> C -> prop), o:list C.
map11 [] [] _ _ _ [] :- !.
map11 XS [] _ F _ ZS :- !, std.map XS F ZS.
map11 [] YS _ _ F ZS :- !, std.map YS F ZS.
map11 [X|XS] [Y|YS] F G H [Z|ZS] :- !, F X Y Z, map11 XS YS F G H ZS.
pred main-end-declare i:list term.
main-end-declare TS :- std.do! [
current-decl Decl,
std.findall (mixin-src T_ M_ X_) AllPostulatedMixins,
std.map AllPostulatedMixins mixin-src-name ML,
coq.locate "axioms" GR, % assumes the name of the mixin is "axioms".
coq.locate "Axioms" GRK, % assumes the name of the mixin constructor is "Axioms".
coq.env.end-section,
if (Decl = mixin-decl) (TS = [], !, main-mixin-requires GR ML Props, Clauses = []) (
Decl = factory-decl, !,
main-factory-requires GR ML Props,
Props => std.fold TS [] main-declare-factory-fun Clauses
),
coq.env.begin-module "Exports" none,
(std.forall Props c\ acc current (clause _ _ c)),
(std.forall Clauses c\ acc current (clause _ _ c)),
std.map {gr-deps GRK} (_\ r\ r = maximal) Implicits,
coq.arguments.set-implicit GRK [[maximal|Implicits]] tt,
coq.env.end-module Exports,
coq.env.end-module _Module,
export Exports,
].