From: Claudio Sacerdoti Coen Date: Fri, 26 Oct 2007 12:26:59 +0000 (+0000) Subject: Wildcard patterns implemented in case analysis. The following term is now X-Git-Tag: 0.4.95@7852~93 X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=commitdiff_plain;h=7c7d7ff143e5a87874e824dce2ad99590e076788 Wildcard patterns implemented in case analysis. The following term is now accepted: match n with [ A => O | B m => m | _ => O ] --- diff --git a/components/acic_content/cicNotationPp.ml b/components/acic_content/cicNotationPp.ml index 2873912c0..4bd2f93ed 100644 --- a/components/acic_content/cicNotationPp.ml +++ b/components/acic_content/cicNotationPp.ml @@ -176,20 +176,24 @@ let rec pp_term ?(pp_parens = true) t = and pp_subst (name, term) = sprintf "%s \\Assign %s" name (pp_term term) and pp_substs substs = String.concat "; " (List.map pp_subst substs) -and pp_pattern ((head, href, vars), term) = - let head_pp = - head ^ - (match debug_printing, href with - | true, Some uri -> sprintf "(i.e.%s)" (UriManager.string_of_uri uri) - | _ -> "") - in - sprintf "%s \\Rightarrow %s" - (match vars with - | [] -> head_pp - | _ -> - sprintf "(%s %s)" head_pp - (String.concat " " (List.map (pp_capture_variable pp_term) vars))) - (pp_term term) +and pp_pattern = + function + Ast.Pattern (head, href, vars), term -> + let head_pp = + head ^ + (match debug_printing, href with + | true, Some uri -> sprintf "(i.e.%s)" (UriManager.string_of_uri uri) + | _ -> "") + in + sprintf "%s \\Rightarrow %s" + (match vars with + | [] -> head_pp + | _ -> + sprintf "(%s %s)" head_pp + (String.concat " " (List.map (pp_capture_variable pp_term) vars))) + (pp_term term) + | Ast.Wildcard, term -> + sprintf "_ \\Rightarrow %s" (pp_term term) and pp_patterns patterns = sprintf "[%s]" (String.concat " | " (List.map pp_pattern patterns)) diff --git a/components/acic_content/cicNotationPt.ml b/components/acic_content/cicNotationPt.ml index 27ec5734f..d9d92ad6f 100644 --- a/components/acic_content/cicNotationPt.ml +++ b/components/acic_content/cicNotationPt.ml @@ -105,7 +105,9 @@ type term = and meta_subst = term option and subst = string * term -and case_pattern = string * href option * term capture_variable list +and case_pattern = + Pattern of string * href option * term capture_variable list + | Wildcard and box_kind = H | V | HV | HOV and box_spec = box_kind * bool * bool (* kind, spacing, indent *) diff --git a/components/acic_content/cicNotationUtil.ml b/components/acic_content/cicNotationUtil.ml index f331b79ca..99aafa440 100644 --- a/components/acic_content/cicNotationUtil.ml +++ b/components/acic_content/cicNotationUtil.ml @@ -67,8 +67,11 @@ let visit_ast ?(special_k = fun _ -> assert false) k = | Some term -> Some (k term) and aux_capture_variable (term, typ_opt) = k term, aux_opt typ_opt and aux_patterns patterns = List.map aux_pattern patterns - and aux_pattern ((head, hrefs, vars), term) = - ((head, hrefs, List.map aux_capture_variable vars), k term) + and aux_pattern = + function + Ast.Pattern (head, hrefs, vars), term -> + Ast.Pattern (head, hrefs, List.map aux_capture_variable vars), k term + | Ast.Wildcard, term -> Ast.Wildcard, k term and aux_subst (name, term) = (name, k term) and aux_substs substs = List.map aux_subst substs in @@ -213,8 +216,10 @@ let meta_names_of_term term = and aux_branch (pattern, term) = aux_pattern pattern ; aux term - and aux_pattern (head, _, vars) = - List.iter aux_capture_var vars + and aux_pattern = + function + Ast.Pattern (head, _, vars) -> List.iter aux_capture_var vars + | Ast.Wildcard -> () and aux_definition (params, var, term, decrno) = List.iter aux_capture_var params ; aux_capture_var var ; diff --git a/components/acic_content/termAcicContent.ml b/components/acic_content/termAcicContent.ml index 9a30b50fb..257d2440b 100644 --- a/components/acic_content/termAcicContent.ml +++ b/components/acic_content/termAcicContent.ml @@ -197,8 +197,8 @@ let ast_of_acic0 term_info acic k = (fun (name, ty) pat -> incr j; let (capture_variables, rhs) = eat_branch lpsno ty pat in - ((name, Some (ctor_puri !j), capture_variables), rhs)) - constructors patterns + Ast.Pattern (name, Some (ctor_puri !j), capture_variables), rhs + ) constructors patterns with Invalid_argument _ -> assert false in idref id (Ast.Case (k te, Some case_indty, Some (k ty), patterns)) diff --git a/components/cic_disambiguation/disambiguate.ml b/components/cic_disambiguation/disambiguate.ml index 3d671cd7f..1fea41921 100644 --- a/components/cic_disambiguation/disambiguate.ml +++ b/components/cic_disambiguation/disambiguate.ml @@ -203,18 +203,18 @@ let interpretate_term ?(create_dummy_ids=false) ~(context: Cic.name list) ~env ~ let cic_term = aux ~localize loc context term in let cic_outtype = aux_option ~localize loc context None outtype in let do_branch ((head, _, args), term) = - let rec do_branch' context = function - | [] -> aux ~localize loc context term - | (name, typ) :: tl -> - let cic_name = CicNotationUtil.cic_name_of_name name in - let cic_body = do_branch' (cic_name :: context) tl in - let typ = - match typ with - | None -> Cic.Implicit (Some `Type) - | Some typ -> aux ~localize loc context typ - in - Cic.Lambda (cic_name, typ, cic_body) - in + let rec do_branch' context = function + | [] -> aux ~localize loc context term + | (name, typ) :: tl -> + let cic_name = CicNotationUtil.cic_name_of_name name in + let cic_body = do_branch' (cic_name :: context) tl in + let typ = + match typ with + | None -> Cic.Implicit (Some `Type) + | Some typ -> aux ~localize loc context typ + in + Cic.Lambda (cic_name, typ, cic_body) + in do_branch' context args in let indtype_uri, indtype_no = @@ -231,12 +231,13 @@ let interpretate_term ?(create_dummy_ids=false) ~(context: Cic.name list) ~env ~ | _ -> raise (Invalid_choice (Some loc, lazy "The type of the term to be matched is not (co)inductive!"))) | None -> - let fst_constructor = - match branches with - | ((head, _, _), _) :: _ -> head - | [] -> raise (Invalid_choice (Some loc, lazy "The type of the term to be matched is an inductive type without constructors that cannot be determined")) + let rec fst_constructor = + function + (Ast.Pattern (head, _, _), _) :: _ -> head + | (Ast.Wildcard, _) :: tl -> fst_constructor tl + | [] -> raise (Invalid_choice (Some loc, lazy "The type of the term to be matched cannot be determined because it is an inductive type without constructors or because all patterns use wildcards")) in - (match resolve env (Id fst_constructor) () with + (match resolve env (Id (fst_constructor branches)) () with | Cic.MutConstruct (indtype_uri, indtype_no, _, _) -> (indtype_uri, indtype_no) | Cic.Implicit _ -> @@ -261,14 +262,31 @@ let interpretate_term ?(create_dummy_ids=false) ~(context: Cic.name list) ~env ~ let rec sort branches cl = match cl with [] -> - if branches = [] then [] - else - raise (Invalid_choice - (Some loc, - lazy - ("Unrecognized constructors: " ^ - String.concat " " - (List.map (fun ((head,_,_),_) -> head) branches)))) + let rec analyze unused unrecognized useless = + function + [] -> + if unrecognized != [] then + raise (Invalid_choice + (Some loc, + lazy + ("Unrecognized constructors: " ^ + String.concat " " unrecognized))) + else if useless > 0 then + raise (Invalid_choice + (Some loc, + lazy + ("The last " ^ string_of_int useless ^ + "case" ^ if useless > 1 then "s are" else " is" ^ + " unused"))) + else + [] + | (Ast.Wildcard,_)::tl when not unused -> + analyze true unrecognized useless tl + | (Ast.Pattern (head,_,_),_)::tl when not unused -> + analyze unused (head::unrecognized) useless tl + | _::tl -> analyze unused unrecognized (useless + 1) tl + in + analyze false [] 0 branches | (name,ty)::cltl -> let rec find_and_remove = function @@ -276,21 +294,36 @@ let interpretate_term ?(create_dummy_ids=false) ~(context: Cic.name list) ~env ~ raise (Invalid_choice (Some loc, lazy ("Missing case: " ^ name))) - | ((name',_,_),_) as branch :: tl when name = name' -> - branch,tl + | ((Ast.Wildcard, _) as branch :: _) as branches -> + branch, branches + | (Ast.Pattern (name',_,_),_) as branch :: tl + when name = name' -> + branch,tl | branch::tl -> let found,rest = find_and_remove tl in found, branch::rest in let branch,tl = find_and_remove branches in - let (_,_,args),_ = branch in - if List.length args = count_prod ty - leftsno then - branch::sort tl cltl - else - raise - (Invalid_choice - (Some loc, - lazy ("Wrong number of arguments for " ^ name))) + match branch with + Ast.Pattern (name,y,args),term -> + if List.length args = count_prod ty - leftsno then + ((name,y,args),term)::sort tl cltl + else + raise + (Invalid_choice + (Some loc, + lazy ("Wrong number of arguments for " ^ name))) + | Ast.Wildcard,term -> + let rec mk_lambdas = + function + 0 -> term + | n -> + CicNotationPt.Binder + (`Lambda, (CicNotationPt.Ident ("_", None), None), + mk_lambdas (n - 1)) + in + (("wildcard",None,[]), + mk_lambdas (count_prod ty - leftsno)) :: sort tl cltl in sort branches cl | _ -> assert false @@ -684,20 +717,25 @@ let rec domain_of_term ?(loc = HExtlib.dummy_floc) ~context = function | Ast.Case (term, indty_ident, outtype, branches) -> let term_dom = domain_of_term ~loc ~context term in let outtype_dom = domain_of_term_option ~loc ~context outtype in - let get_first_constructor = function + let rec get_first_constructor = function | [] -> [] - | ((head, _, _), _) :: _ -> [ Node ([loc], Id head, []) ] in - let do_branch ((head, _, args), term) = - let (term_context, args_domain) = - List.fold_left - (fun (cont, dom) (name, typ) -> - (CicNotationUtil.cic_name_of_name name :: cont, - (match typ with - | None -> dom - | Some typ -> dom @ domain_of_term ~loc ~context:cont typ))) - (context, []) args - in - domain_of_term ~loc ~context:term_context term @ args_domain + | (Ast.Pattern (head, _, _), _) :: _ -> [ Node ([loc], Id head, []) ] + | _ :: tl -> get_first_constructor tl in + let do_branch = + function + Ast.Pattern (head, _, args), term -> + let (term_context, args_domain) = + List.fold_left + (fun (cont, dom) (name, typ) -> + (CicNotationUtil.cic_name_of_name name :: cont, + (match typ with + | None -> dom + | Some typ -> dom @ domain_of_term ~loc ~context:cont typ))) + (context, []) args + in + domain_of_term ~loc ~context:term_context term @ args_domain + | Ast.Wildcard, term -> + domain_of_term ~loc ~context term in let branches_dom = List.fold_left (fun dom branch -> dom @ do_branch branch) [] branches in diff --git a/components/content_pres/cicNotationParser.ml b/components/content_pres/cicNotationParser.ml index 05075f0c3..461e2fc9f 100644 --- a/components/content_pres/cicNotationParser.ml +++ b/components/content_pres/cicNotationParser.ml @@ -457,10 +457,12 @@ EXTEND ] ]; match_pattern: [ - [ id = IDENT -> id, None, [] + [ id = IDENT -> Ast.Pattern (id, None, []) | LPAREN; id = IDENT; vars = LIST1 possibly_typed_name; RPAREN -> - id, None, vars - | id = IDENT; vars = LIST1 possibly_typed_name -> id, None, vars + Ast.Pattern (id, None, vars) + | id = IDENT; vars = LIST1 possibly_typed_name -> + Ast.Pattern (id, None, vars) + | SYMBOL "_" -> Ast.Wildcard ] ]; binder: [ diff --git a/components/content_pres/termContentPres.ml b/components/content_pres/termContentPres.ml index 110c78e46..0ee424f18 100644 --- a/components/content_pres/termContentPres.ml +++ b/components/content_pres/termContentPres.ml @@ -151,8 +151,11 @@ let pp_ast0 t k = space ] in - let mk_case_pattern (head, href, vars) = - hbox true false (ident_w_href href head :: List.map aux_var vars) + let mk_case_pattern = + function + Ast.Pattern (head, href, vars) -> + hbox true false (ident_w_href href head :: List.map aux_var vars) + | Ast.Wildcard -> builtin_symbol "_" in let patterns' = List.map @@ -575,8 +578,11 @@ let instantiate_level2 env term = and aux_capture_var env (name, ty_opt) = (aux env name, aux_opt env ty_opt) and aux_branch env (pattern, term) = (aux_pattern env pattern, aux env term) - and aux_pattern env (head, hrefs, vars) = - (head, hrefs, List.map (aux_capture_var env) vars) + and aux_pattern env = + function + Ast.Pattern (head, hrefs, vars) -> + Ast.Pattern (head, hrefs, List.map (aux_capture_var env) vars) + | Ast.Wildcard -> Ast.Wildcard and aux_definition env (params, var, term, i) = (List.map (aux_capture_var env) params, aux_capture_var env var, aux env term, i) and aux_substs env substs =