--- /dev/null
+(**************************************************************************)
+(* ___ *)
+(* ||M|| *)
+(* ||A|| A project by Andrea Asperti *)
+(* ||T|| *)
+(* ||I|| Developers: *)
+(* ||T|| The HELM team. *)
+(* ||A|| http://helm.cs.unibo.it *)
+(* \ / *)
+(* \ / This file is distributed under the terms of the *)
+(* v GNU General Public License Version 2 *)
+(* *)
+(**************************************************************************)
+
+(* ********************************************************************** *)
+(* Progetto FreeScale *)
+(* *)
+(* Sviluppato da: Ing. Cosimo Oliboni, oliboni@cs.unibo.it *)
+(* Sviluppo: 2008-2010 *)
+(* *)
+(* ********************************************************************** *)
+
+include "common/list.ma".
+include "common/option.ma".
+include "common/nat_lemmas.ma".
+
+(* *************** *)
+(* LISTE GENERICHE *)
+(* *************** *)
+
+(* listlen *)
+nlet rec len_list (T:Type) (l:list T) on l ≝
+ match l with [ nil ⇒ O | cons _ t ⇒ S (len_list T t) ].
+
+(* vuota? *)
+ndefinition is_empty_list ≝
+λT:Type.λl:list T.match l with [ nil ⇒ True | cons _ _ ⇒ False ].
+
+ndefinition isb_empty_list ≝
+λT:Type.λl:list T.match l with [ nil ⇒ true | cons _ _ ⇒ false ].
+
+ndefinition isnot_empty_list ≝
+λT:Type.λl:list T.match l with [ nil ⇒ False | cons _ _ ⇒ True ].
+
+ndefinition isnotb_empty_list ≝
+λT:Type.λl:list T.match l with [ nil ⇒ false | cons _ _ ⇒ true ].
+
+(* reverse *)
+nlet rec reverse_list (T:Type) (l:list T) on l ≝
+ match l with
+ [ nil ⇒ nil T
+ | cons h t ⇒ (reverse_list T t)@[h]
+ ].
+
+(* getFirst *)
+ndefinition get_first_list ≝
+λT:Type.λl:list T.match l with
+ [ nil ⇒ None ?
+ | cons h _ ⇒ Some ? h ].
+
+(* getLast *)
+ndefinition get_last_list ≝
+λT:Type.λl:list T.match reverse_list T l with
+ [ nil ⇒ None ?
+ | cons h _ ⇒ Some ? h ].
+
+(* cutFirst *)
+ndefinition cut_first_list ≝
+λT:Type.λl:list T.match l with
+ [ nil ⇒ nil T
+ | cons _ t ⇒ t ].
+
+(* cutLast *)
+ndefinition cut_last_list ≝
+λT:Type.λl:list T.match reverse_list T l with
+ [ nil ⇒ nil T
+ | cons _ t ⇒ reverse_list T t ].
+
+(* apply f *)
+nlet rec apply_f_list (T1,T2:Type) (l:list T1) (f:T1 → T2) on l ≝
+match l with
+ [ nil ⇒ nil T2
+ | cons h t ⇒ cons T2 (f h) (apply_f_list T1 T2 t f) ].
+
+(* fold right *)
+nlet rec fold_right_list (T1,T2:Type) (f:T1 → T2 → T2) (acc:T2) (l:list T1) on l ≝
+ match l with
+ [ nil ⇒ acc
+ | cons h t ⇒ f h (fold_right_list T1 T2 f acc t)
+ ].
+
+(* double fold right *)
+nlemma fold_right_list2_aux1 :
+∀T.∀h,t.len_list T [] = len_list T (h::t) → False.
+ #T; #h; #t;
+ nnormalize;
+ #H;
+ ndestruct (*napply (nat_destruct_0_S ? H)*).
+nqed.
+
+nlemma fold_right_list2_aux2 :
+∀T.∀h,t.len_list T (h::t) = len_list T [] → False.
+ #T; #h; #t;
+ nnormalize;
+ #H;
+ ndestruct (*napply (nat_destruct_S_0 ? H)*).
+nqed.
+
+nlemma fold_right_list2_aux3 :
+∀T.∀h,h',t,t'.len_list T (h::t) = len_list T (h'::t') → len_list T t = len_list T t'.
+ #T; #h; #h'; #t; #t';
+ nelim t;
+ nelim t';
+ ##[ ##1: nnormalize; #H; napply refl_eq
+ ##| ##2: #a; #l'; #H; #H1;
+ nchange in H1:(%) with ((S O) = (S (S (len_list T l'))));
+ ndestruct (*nelim (nat_destruct_0_S ? (nat_destruct_S_S … H1))*)
+ ##| ##3: #a; #l'; #H; #H1;
+ nchange in H1:(%) with ((S (S (len_list T l'))) = (S O));
+ ndestruct (*nelim (nat_destruct_S_0 ? (nat_destruct_S_S … H1))*)
+ ##| ##4: #a; #l; #H; #a1; #l1; #H1; #H2;
+ nchange in H2:(%) with ((S (S (len_list T l1))) = (S (S (len_list T l))));
+ nchange with ((S (len_list T l1)) = (S (len_list T l)));
+ nrewrite > (nat_destruct_S_S … H2);
+ napply refl_eq
+ ##]
+nqed.
+
+nlet rec fold_right_list2 (T1,T2:Type) (f:T1 → T1 → T2 → T2) (acc:T2) (l1:list T1) on l1 ≝
+ match l1
+ return λl1.Πl2.len_list T1 l1 = len_list T1 l2 → T2
+ with
+ [ nil ⇒ λl2.match l2 return λl2.len_list T1 [] = len_list T1 l2 → T2 with
+ [ nil ⇒ λp:len_list T1 [] = len_list T1 [].acc
+ | cons h t ⇒ λp:len_list T1 [] = len_list T1 (h::t).
+ False_rect_Type0 ? (fold_right_list2_aux1 T1 h t p)
+ ]
+ | cons h t ⇒ λl2.match l2 return λl2.len_list T1 (h::t) = len_list T1 l2 → T2 with
+ [ nil ⇒ λp:len_list T1 (h::t) = len_list T1 [].
+ False_rect_Type0 ? (fold_right_list2_aux2 T1 h t p)
+ | cons h' t' ⇒ λp:len_list T1 (h::t) = len_list T1 (h'::t').
+ f h h' (fold_right_list2 T1 T2 f acc t t' (fold_right_list2_aux3 T1 h h' t t' p))
+ ]
+ ].
+
+nlet rec bfold_right_list2 (T1:Type) (f:T1 → T1 → bool) (l1,l2:list T1) on l1 ≝
+ match l1 with
+ [ nil ⇒ match l2 with
+ [ nil ⇒ true | cons h t ⇒ false ]
+ | cons h t ⇒ match l2 with
+ [ nil ⇒ false | cons h' t' ⇒ (f h h') ⊗ (bfold_right_list2 T1 f t t')
+ ]
+ ].
+
+(* nth elem *)
+nlet rec nth_list (T:Type) (l:list T) (n:nat) on l ≝
+ match l with
+ [ nil ⇒ None ?
+ | cons h t ⇒ match n with
+ [ O ⇒ Some ? h | S n' ⇒ nth_list T t n' ]
+ ].
+
+(* abs elem *)
+ndefinition abs_list_aux1 : ∀T:Type.∀n.((len_list T []) > n) = true → False.
+ #T; nnormalize; #n; #H; ndestruct (*napply (bool_destruct … H)*). nqed.
+
+ndefinition abs_list_aux2 : ∀T:Type.∀h:T.∀t:list T.∀n.((len_list T (h::t)) > (S n) = true) → ((len_list T t) > n) = true.
+ #T; #h; #t; #n; nnormalize; #H; napply H. nqed.
+
+nlet rec abs_list (T:Type) (l:list T) on l ≝
+ match l
+ return λl.Πn.(((len_list T l) > n) = true) → T
+ with
+ [ nil ⇒ λn.λp:(((len_list T []) > n) = true).False_rect_Type0 ? (abs_list_aux1 T n p)
+ | cons h t ⇒ λn.
+ match n with
+ [ O ⇒ λp:(((len_list T (h::t)) > O) = true).h
+ | S n' ⇒ λp:(((len_list T (h::t)) > (S n')) = true).
+ abs_list T t n' (abs_list_aux2 T h t n' p)
+ ]
+ ].
+
+(* esempio: abs_list ? [ 1; 2; 3; 4 ] 2 (refl_eq …) = 0. *)
+
+(* ************** *)
+(* NON-EMPTY LIST *)
+(* ************** *)
+
+(* listlen *)
+nlet rec len_neList (T:Type) (nl:ne_list T) on nl ≝
+ match nl with [ ne_nil _ ⇒ (S O) | ne_cons _ t ⇒ S (len_neList T t) ].
+
+(* reverse *)
+nlet rec reverse_neList (T:Type) (nl:ne_list T) on nl ≝
+ match nl with
+ [ ne_nil h ⇒ ne_nil T h
+ | ne_cons h t ⇒ (reverse_neList T t)&(ne_nil T h)
+ ].
+
+(* getFirst *)
+ndefinition get_first_neList ≝
+λT:Type.λnl:ne_list T.match nl with
+ [ ne_nil h ⇒ h
+ | ne_cons h _ ⇒ h ].
+
+(* getLast *)
+ndefinition get_last_neList ≝
+λT:Type.λnl:ne_list T.match reverse_neList T nl with
+ [ ne_nil h ⇒ h
+ | ne_cons h _ ⇒ h ].
+
+(* cutFirst *)
+ndefinition cut_first_neList ≝
+λT:Type.λnl:ne_list T.match nl with
+ [ ne_nil h ⇒ ne_nil T h
+ | ne_cons _ t ⇒ t ].
+
+(* cutLast *)
+ndefinition cut_last_neList ≝
+λT:Type.λnl:ne_list T.match reverse_neList T nl with
+ [ ne_nil h ⇒ ne_nil T h
+ | ne_cons _ t ⇒ reverse_neList T t ].
+
+(* apply f *)
+nlet rec apply_f_neList (T1,T2:Type) (nl:ne_list T1) (f:T1 → T2) on nl ≝
+match nl with
+ [ ne_nil h ⇒ ne_nil T2 (f h)
+ | ne_cons h t ⇒ ne_cons T2 (f h) (apply_f_neList T1 T2 t f) ].
+
+(* fold right *)
+nlet rec fold_right_neList (T1,T2:Type) (f:T1 → T2 → T2) (acc:T2) (nl:ne_list T1) on nl ≝
+ match nl with
+ [ ne_nil h ⇒ f h acc
+ | ne_cons h t ⇒ f h (fold_right_neList T1 T2 f acc t)
+ ].
+
+(* double fold right *)
+nlemma fold_right_neList2_aux1 :
+∀T.∀h,h',t'.len_neList T «£h» = len_neList T (h'§§t') → False.
+ #T; #h; #h'; #t';
+ nnormalize;
+ ncases t';
+ nnormalize;
+ ##[ ##1: #x; #H; ndestruct (*nelim (nat_destruct_0_S ? (nat_destruct_S_S … H))*)
+ ##| ##2: #x; #l; #H; ndestruct (*nelim (nat_destruct_0_S ? (nat_destruct_S_S … H))*)
+ ##]
+nqed.
+
+nlemma fold_right_neList2_aux2 :
+∀T.∀h,h',t.len_neList T (h§§t) = len_neList T «£h'» → False.
+ #T; #h; #h'; #t;
+ nnormalize;
+ ncases t;
+ nnormalize;
+ ##[ ##1: #x; #H; ndestruct (*nelim (nat_destruct_S_0 ? (nat_destruct_S_S … H))*)
+ ##| ##2: #x; #l; #H; ndestruct (*nelim (nat_destruct_S_0 ? (nat_destruct_S_S … H))*)
+ ##]
+nqed.
+
+nlemma fold_right_neList2_aux3 :
+∀T.∀h,h',t,t'.len_neList T (h§§t) = len_neList T (h'§§t') → len_neList T t = len_neList T t'.
+ #T; #h; #h'; #t; #t';
+ nelim t;
+ nelim t';
+ ##[ ##1: nnormalize; #x; #y; #H; napply refl_eq
+ ##| ##2: #a; #l'; #H; #x; #H1;
+ nchange in H1:(%) with ((S (len_neList T «£x»)) = (S (len_neList T (a§§l'))));
+ nrewrite > (nat_destruct_S_S … H1);
+ napply refl_eq
+ ##| ##3: #x; #a; #l'; #H; #H1;
+ nchange in H1:(%) with ((S (len_neList T (a§§l')))= (S (len_neList T «£x»)));
+ nrewrite > (nat_destruct_S_S … H1);
+ napply refl_eq
+ ##| ##4: #a; #l; #H; #a1; #l1; #H1; #H2;
+ nchange in H2:(%) with ((S (len_neList T (a1§§l1))) = (S (len_neList T (a§§l))));
+ nrewrite > (nat_destruct_S_S … H2);
+ napply refl_eq
+ ##]
+nqed.
+
+nlet rec fold_right_neList2 (T1,T2:Type) (f:T1 → T1 → T2 → T2) (acc:T2) (l1:ne_list T1) on l1 ≝
+ match l1
+ return λl1.Πl2.len_neList T1 l1 = len_neList T1 l2 → T2
+ with
+ [ ne_nil h ⇒ λl2.match l2 return λl2.len_neList T1 «£h» = len_neList T1 l2 → T2 with
+ [ ne_nil h' ⇒ λp:len_neList T1 «£h» = len_neList T1 «£h'».
+ f h h' acc
+ | ne_cons h' t' ⇒ λp:len_neList T1 «£h» = len_neList T1 (h'§§t').
+ False_rect_Type0 ? (fold_right_neList2_aux1 T1 h h' t' p)
+ ]
+ | ne_cons h t ⇒ λl2.match l2 return λl2.len_neList T1 (h§§t) = len_neList T1 l2 → T2 with
+ [ ne_nil h' ⇒ λp:len_neList T1 (h§§t) = len_neList T1 «£h'».
+ False_rect_Type0 ? (fold_right_neList2_aux2 T1 h h' t p)
+ | ne_cons h' t' ⇒ λp:len_neList T1 (h§§t) = len_neList T1 (h'§§t').
+ f h h' (fold_right_neList2 T1 T2 f acc t t' (fold_right_neList2_aux3 T1 h h' t t' p))
+ ]
+ ].
+
+nlet rec bfold_right_neList2 (T1:Type) (f:T1 → T1 → bool) (l1,l2:ne_list T1) on l1 ≝
+ match l1 with
+ [ ne_nil h ⇒ match l2 with
+ [ ne_nil h' ⇒ f h h' | ne_cons h' t' ⇒ false ]
+ | ne_cons h t ⇒ match l2 with
+ [ ne_nil h' ⇒ false | ne_cons h' t' ⇒ (f h h') ⊗ (bfold_right_neList2 T1 f t t')
+ ]
+ ].
+
+(* nth elem *)
+nlet rec nth_neList (T:Type) (nl:ne_list T) (n:nat) on nl ≝
+ match nl with
+ [ ne_nil h ⇒ match n with
+ [ O ⇒ Some ? h | S _ ⇒ None ? ]
+ | ne_cons h t ⇒ match n with
+ [ O ⇒ Some ? h | S n' ⇒ nth_neList T t n' ]
+ ].
+
+(* abs elem *)
+ndefinition abs_neList_aux1 : ∀T:Type.∀h:T.∀n.((len_neList T («£h»)) > (S n)) = true → False.
+ #T; #h; #n; nnormalize; #H; ndestruct (*napply (bool_destruct … H)*). nqed.
+
+ndefinition abs_neList_aux2 : ∀T:Type.∀h:T.∀t:ne_list T.∀n.((len_neList T (h§§t)) > (S n) = true) → ((len_neList T t) > n) = true.
+ #T; #h; #t; #n; nnormalize; #H; napply H. nqed.
+
+nlet rec abs_neList (T:Type) (l:ne_list T) on l ≝
+ match l
+ return λl.Πn.(((len_neList T l) > n) = true) → T
+ with
+ [ ne_nil h ⇒ λn.
+ match n
+ return λn.(((len_neList T (ne_nil T h)) > n) = true) → T
+ with
+ [ O ⇒ λp:(((len_neList T (ne_nil T h)) > O) = true).h
+ | S n' ⇒ λp:(((len_neList T (ne_nil T h)) > (S n')) = true).
+ False_rect_Type0 ? (abs_neList_aux1 T h n' p)
+ ]
+ | ne_cons h t ⇒ λn.
+ match n with
+ [ O ⇒ λp:(((len_neList T (ne_cons T h t)) > O) = true).h
+ | S n' ⇒ λp:(((len_neList T (ne_cons T h t)) > (S n')) = true).
+ abs_neList T t n' (abs_neList_aux2 T h t n' p)
+ ]
+ ].
+
+(* esempio: abs_neList ? « 1; 2; 3 £ 4 » 0 (refl_eq …) = 0. *)
+
+(* conversione *)
+nlet rec neList_to_list (T:Type) (nl:ne_list T) on nl : list T ≝
+ match nl with [ ne_nil h ⇒ [h] | ne_cons h t ⇒ [h]@(neList_to_list T t) ].
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