+(* 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/.
+ *)
+
+(******************************************************************************)
+(* *)
+(* PROJECT HELM *)
+(* *)
+(* Ferruccio Guidi <fguidi@cs.unibo.it> *)
+(* 30/04/2002 *)
+(* *)
+(* *)
+(******************************************************************************)
+
+open MathQL
+
+(* string linearization of a reference *)
+
+let str_btoken = function
+ | MQBC s -> s
+ | MQBD -> "/"
+ | MQBQ -> "?"
+ | MQBS -> "*"
+ | MQBSS -> "**"
+
+let str_ftoken = function
+ | MQFC i -> "/" ^ string_of_int i
+ | MQFS -> "/*"
+ | MQFSS -> "/**"
+
+let str_prot = function
+ | Some s -> s
+ | None -> "*"
+
+let rec str_body = function
+ | [] -> ""
+ | head :: tail -> str_btoken head ^ str_body tail
+
+let str_frag l =
+ let rec str_fi start = function
+ | [] -> ""
+ | t :: l ->
+ (if start then "#1" else "") ^ str_ftoken t ^ str_fi false l
+ in str_fi true l
+
+let str_tref (p, b, i) =
+ str_prot p ^ ":/" ^ str_body b ^ str_frag i
+
+let str_uref (u, i) =
+ let rec str_fi start = function
+ | [] -> ""
+ | i :: l ->
+ (if start then "#1" else "") ^ string_of_int i ^ str_fi false l
+ in UriManager.string_of_uri u ^ str_fi true i
+
+(* raw HTML representation *)
+
+let key s = "<font color=\"blue\">" ^ s ^ " </font>"
+
+let sym s = s ^ " "
+
+let sep s = s
+
+let str s = "<font color=\"red\">'" ^ s ^ "' </font>"
+
+let pat s = "<font color=\"red\">\"" ^ s ^ "\" </font>"
+
+let res s = "<font color=\"brown\">\"" ^ s ^ "\" </font>"
+
+let nl () = "<br>"
+
+let par () = "<p>"
+
+(* HTML representation of a query *)
+
+let out_rvar s = sym s
+
+let out_svar s = sep "$" ^ sym s
+
+let out_tref r = pat (str_tref r)
+
+let out_pat p = out_tref p
+
+let out_func = function
+ | MQName -> key "name"
+
+let out_str = function
+ | MQCons s -> str s
+ | MQRVar s -> out_rvar s
+ | MQSVar s -> out_svar s
+ | MQFunc (f, r) -> out_func f ^ out_rvar r
+ | MQMConclusion -> key "mainconclusion"
+ | MQConclusion -> key "conclusion"
+
+let rec out_bool = function
+ | MQTrue -> key "true"
+ | MQFalse -> key "false"
+ | MQIs (s, t) -> out_str s ^ key "is" ^ out_str t
+ | MQNot b -> key "not" ^ out_bool b
+ | MQAnd (b1, b2) -> sep "(" ^ out_bool b1 ^ key "and" ^ out_bool b2 ^ sep ")"
+ | MQOr (b1, b2) -> sep "(" ^ out_bool b1 ^ key "or" ^ out_bool b2 ^ sep ")"
+
+let rec out_list = function
+ | MQSelect (r, l, b) ->
+ key "select" ^ out_rvar r ^ key "in" ^ out_list l ^ key "where" ^ out_bool b
+ | MQUse (l, v) -> key "use" ^ out_list l ^ key "position" ^ out_svar v
+ | MQUsedBy (l, v) -> key "usedby" ^ out_list l ^ key "position" ^ out_svar v
+ | MQPattern p -> key "pattern" ^ out_pat p
+ | MQUnion (l1, l2) -> sep "(" ^ out_list l1 ^ key "union" ^ out_list l2 ^ sep ")"
+ | MQIntersect (l1, l2) -> sep "(" ^ out_list l1 ^ key "intersect" ^ out_list l2 ^ sep ")"
+
+let out_query = function
+ | MQList l -> out_list l
+
+(* HTML representation of a query result *)
+
+let rec out_list = function
+ | [] -> ""
+ | u :: l -> res u ^ nl () ^ out_list l
+
+let out_result qr =
+ par () ^ "Result:" ^ nl () ^
+ match qr with
+ | MQRefs l -> out_list l
+
+(* Converting functions *)
+
+let tref_uref u =
+ let s = str_uref u in
+ MQueryTParser.ref MQueryTLexer.rtoken (Lexing.from_string s)
+
+let parse_text ch =
+ let lexbuf = Lexing.from_channel ch in
+ MQueryTParser.query MQueryTLexer.qtoken lexbuf