branch for universe

[helm.git] / components / hgdome / xml2Gdome.ml

diff --git a/components/hgdome/xml2Gdome.ml b/components/hgdome/xml2Gdome.ml
new file mode 100644 (file)
index 0000000..eb6a764
--- /dev/null
+++ b/components/hgdome/xml2Gdome.ml
@@ -0,0 +1,135 @@
+(* Copyright (C) 2000-2002, 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/.
+ *)
+
+(* $Id$ *)
+
+let document_of_xml (domImplementation : Gdome.domImplementation) strm =
+ let module G = Gdome in
+ let module X = Xml in
+  let rec update_namespaces ((defaultns,bindings) as namespaces) =
+   function
+      [] -> namespaces
+    | (None,"xmlns",value)::tl ->
+       update_namespaces (Some (Gdome.domString value),bindings) tl
+    | (prefix,name,value)::tl when prefix = Some "xmlns"  ->
+        update_namespaces (defaultns,(name,Gdome.domString value)::bindings) tl
+    | _::tl -> update_namespaces namespaces tl in
+  let rec namespace_of_prefix (defaultns,bindings) =
+   function
+      None -> None
+    | Some "xmlns" -> Some (Gdome.domString "xml-ns")
+    | Some p' ->
+       try
+        Some (List.assoc p' bindings)
+       with
+        Not_found ->
+         raise
+          (Failure ("The prefix " ^ p' ^ " is not bound to any namespace")) in
+  let get_qualified_name p n =
+   match p with
+      None -> Gdome.domString n
+    | Some p' -> Gdome.domString (p' ^ ":" ^ n) in
+  let root_prefix,root_name,root_attributes,root_content =
+   ignore (Stream.next strm) ; (* to skip the <?xml ...?> declaration *)
+   ignore (Stream.next strm) ; (* to skip the DOCTYPE declaration *)
+   match Stream.next strm with
+      X.Empty(p,n,l) -> p,n,l,[<>]
+    | X.NEmpty(p,n,l,c) -> p,n,l,c
+    | _ -> assert false
+  in
+   let namespaces = update_namespaces (None,[]) root_attributes in
+   let namespaceURI = namespace_of_prefix namespaces root_prefix in
+   let document =
+    domImplementation#createDocument ~namespaceURI
+     ~qualifiedName:(get_qualified_name root_prefix root_name)
+     ~doctype:None
+   in
+   let rec aux namespaces (node : Gdome.node) =
+    parser
+      [< 'X.Str a ; s >] ->
+        let textnode = document#createTextNode ~data:(Gdome.domString a) in
+         ignore (node#appendChild ~newChild:(textnode :> Gdome.node)) ;
+         aux namespaces node s
+    | [< 'X.Empty(p,n,l) ; s >] ->
+        let namespaces' = update_namespaces namespaces l in
+         let namespaceURI = namespace_of_prefix namespaces' p in
+          let element =
+           document#createElementNS ~namespaceURI
+            ~qualifiedName:(get_qualified_name p n)
+          in
+           List.iter
+            (function (p,n,v) ->
+              if p = None then
+               element#setAttribute ~name:(Gdome.domString n)
+                ~value:(Gdome.domString v)
+              else
+               let namespaceURI = namespace_of_prefix namespaces' p in
+                element#setAttributeNS
+                 ~namespaceURI
+                 ~qualifiedName:(get_qualified_name p n)
+                 ~value:(Gdome.domString v)
+            ) l ;
+          ignore
+           (node#appendChild
+             ~newChild:(element : Gdome.element :> Gdome.node)) ;
+          aux namespaces node s
+    | [< 'X.NEmpty(p,n,l,c) ; s >] ->
+        let namespaces' = update_namespaces namespaces l in
+         let namespaceURI = namespace_of_prefix namespaces' p in
+          let element =
+           document#createElementNS ~namespaceURI
+            ~qualifiedName:(get_qualified_name p n)
+          in
+           List.iter
+            (function (p,n,v) ->
+              if p = None then
+               element#setAttribute ~name:(Gdome.domString n)
+                ~value:(Gdome.domString v)
+              else
+               let namespaceURI = namespace_of_prefix namespaces' p in
+                element#setAttributeNS ~namespaceURI
+                 ~qualifiedName:(get_qualified_name p n)
+                 ~value:(Gdome.domString v)
+            ) l ;
+           ignore (node#appendChild ~newChild:(element :> Gdome.node)) ;
+           aux namespaces' (element :> Gdome.node) c ;
+           aux namespaces node s
+    | [< >] -> ()
+   in
+    let root = document#get_documentElement in
+     List.iter
+      (function (p,n,v) ->
+        if p = None then
+         root#setAttribute ~name:(Gdome.domString n)
+          ~value:(Gdome.domString v)
+        else
+         let namespaceURI = namespace_of_prefix namespaces p in
+          root#setAttributeNS ~namespaceURI
+           ~qualifiedName:(get_qualified_name p n)
+           ~value:(Gdome.domString v)
+      ) root_attributes ;
+     aux namespaces (root : Gdome.element :> Gdome.node) root_content ;
+     document
+;;