+++ /dev/null
-(* Copyright (C) 2000, HELM Team.
- *
- * This file is part of HELM, an Hypertextual, Electronic
- * Library of Mathematics, developed at the Computer Science
- * Department, University of Bologna, Italy.
- *
- * HELM is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * HELM is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with HELM; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- *
- * For details, see the HELM World-Wide-Web page,
- * http://cs.unibo.it/helm/.
- *)
-
-(* AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
- *)
-
-module M = MathQL
-module P = MQIPostgres
-module C = MQIConn
-module U = MQIUtil
-module A = MQIMap
-
-let not_supported s =
- raise (Failure ("MQIProperty: feature not supported: " ^ s))
-
-(* debugging ***************************************************************)
-
-let pg_print l =
- let rec pg_record = function
- | [] -> prerr_newline ()
- | head :: tail -> prerr_string (head ^ " "); pg_record tail
- in
- List.iter pg_record l
-
-let cl_print l =
- let c_print (b, p, v) =
- prerr_string (if b then "match " else "in ");
- List.iter (fun x -> prerr_string ("/" ^ x)) p;
- prerr_newline ();
- List.iter prerr_endline v
- in
- List.iter c_print l
-
-(* PostgreSQL backend ******************************************************)
-
-let pg_query h table cols ct cfl =
- let exec q =
- if C.set h C.Log then C.log h (q ^ "\n");
- P.exec (C.pgc h) q
- in
- let rec iter f sep = function
- | [] -> ""
- | [head] -> f head
- | head :: tail -> f head ^ sep ^ iter f sep tail
- in
- let pg_cols = iter (fun x -> x) ", " cols in
- let pg_msval v = iter P.quote ", " v in
- let pg_con (pat, col, v) =
- if col <> "" then
- let f s = col ^ " ~ " ^ P.quote ("^" ^ s ^ "$") in
- if pat then "(" ^ iter f " or " v ^ ")"
- else match v with
- | [s] -> col ^ " = " ^ (P.quote s)
- | v -> col ^ " in (" ^ pg_msval v ^ ")"
- else "true"
- in
- let pg_cons l = iter pg_con " and " l in
- let pg_cons_not l = "not (" ^ pg_cons l ^ ")" in
- let pg_cons_not_l ll = iter pg_cons_not " and " ll in
- let pg_where = match ct, cfl with
- | [], [] -> ""
- | lt, [] -> " where " ^ pg_cons lt
- | [], llf -> " where " ^ pg_cons_not_l llf
- | lt, llf -> " where " ^ pg_cons lt ^ " and " ^ pg_cons_not_l llf
- in
- if cols = [] then
- let r = exec ("select count (source) from " ^ table ^ pg_where) in
- match r with
- | [[s]] when int_of_string s > 0 -> [[]]
- | _ -> []
- else
- exec ("select " ^ pg_cols ^ " from " ^ table ^ pg_where ^
- " order by " ^ List.hd cols ^ " asc")
-
-(* Galax backend ***********************************************************)
-
-let gx_query h table cols ct cfl = not_supported "Galax"
-
-(* Common functions ********************************************************)
-
-let pg_result distinct subj el res =
- let compose = if distinct then List.map else fun f -> U.mql_iter (fun x -> [f x]) in
- let get_name = function (p, None) -> p | (_, Some p) -> p in
- let names = List.map get_name el in
- let mk_grp l =
- let grp = U.mql_iter2 (fun p s -> [(p, [s])]) names l in
- if grp = [] then [] else [grp]
- in
- let mk_avs l =
- if subj = "" then ("", mk_grp l) else (List.hd l, mk_grp (List.tl l))
- in
- compose mk_avs res
-
-let get_table h mc ct cfl el =
- let aux_c ts (_, p, _) = A.refine_tables ts (C.tables h p) in
- let aux_e ts (p, _) = A.refine_tables ts (C.tables h p) in
- let fst = C.tables h mc in
- let snd = List.fold_left aux_c fst (ct @ (List.concat cfl)) in
- let trd = List.fold_left aux_e snd el in
- A.default_table trd
-
-let exec_single h mc ct cfl el table =
- let conv p = C.field h p table in
- let first = conv mc in
- let mk_con l = List.map (fun (pat, p, v) -> (pat, conv p, v)) l in
- let cons_true = mk_con ct in
- let cons_false = List.map mk_con cfl in
- let other_cols = List.map (fun (p, _) -> conv p) el in
- let cols = if first = "" then other_cols else first :: other_cols in
- let low_level = if C.set h C.Galax then gx_query else pg_query in
- let result = low_level h (C.resolve h table) cols cons_true cons_false in
- pg_result false first el result
-
-let deadline = 100
-
-let exec h refine mc ct cfl el =
- if refine <> M.RefineExact then not_supported "exec";
- let table = get_table h mc ct cfl el in
- let rec exec_aux ct = match ct with
- | (pat, p, v) :: tail when List.length v > deadline ->
- let single s = exec_aux ((pat, p, [s]) :: tail) in
- U.mql_iter single v
- | _ ->
- exec_single h mc ct cfl el table
- in exec_aux ct
-
-(* funzioni vecchie ********************************************************)
-
-let pg_name h s =
- let q = "select id from registry where uri = " ^ P.quote s in
- match P.exec h q with
- | [[id]] -> "t" ^ id
- | _ -> ""
-
-let get_id b = if b then ["B"] else ["F"]
projects / helm.git / blobdiff