branch for universe

[helm.git] / components / content_pres / box.ml

diff --git a/components/content_pres/box.ml b/components/content_pres/box.ml
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+(* Copyright (C) 2000-2005, 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                                *)
+(*                                                                       *)
+(*                Andrea Asperti <asperti@cs.unibo.it>                   *)
+(*                             13/2/2004                                 *)
+(*                                                                       *)
+(*************************************************************************)
+
+(* $Id$ *)
+
+type 
+  'expr box =
+    Text of attr * string
+  | Space of attr
+  | Ink of attr
+  | H of attr * ('expr box) list
+  | V of attr * ('expr box) list
+  | HV of attr * ('expr box) list
+  | HOV of attr * ('expr box) list
+  | Object of attr * 'expr
+  | Action of attr * ('expr box) list
+
+and attr = (string option * string * string) list
+
+let smallskip = Space([None,"width","0.5em"]);;
+let skip = Space([None,"width","1em"]);;
+
+let indent t = H([],[skip;t]);;
+
+(* BoxML prefix *)
+let prefix = "b";;
+
+let tag_of_box = function
+  | H _ -> "h"
+  | V _ -> "v"
+  | HV _ -> "hv"
+  | HOV _ -> "hov"
+  | _ -> assert false
+ 
+let box2xml ~obj2xml box =
+  let rec aux =
+   let module X = Xml in
+    function
+        Text (attr,s) -> X.xml_nempty ~prefix "text" attr (X.xml_cdata s)
+      | Space attr -> X.xml_empty ~prefix "space" attr
+      | Ink attr -> X.xml_empty ~prefix "ink" attr
+      | H (attr,l)
+      | V (attr,l)
+      | HV (attr,l)
+      | HOV (attr,l) as box ->
+          X.xml_nempty ~prefix (tag_of_box box) attr 
+            [< (List.fold_right (fun x i -> [< (aux x) ; i >]) l [<>])
+            >]
+      | Object (attr,m) ->
+          X.xml_nempty ~prefix "obj" attr [< obj2xml m >]
+      | Action (attr,l) ->
+          X.xml_nempty ~prefix "action" attr 
+            [< (List.fold_right (fun x i -> [< (aux x) ; i >]) l [<>]) >]
+  in
+  aux box
+;;
+
+let rec map f = function
+  | (Text _) as box -> box
+  | (Space _) as box -> box
+  | (Ink _) as box -> box
+  | H (attr, l) -> H (attr, List.map (map f) l)
+  | V (attr, l) -> V (attr, List.map (map f) l)
+  | HV (attr, l) -> HV (attr, List.map (map f) l)
+  | HOV (attr, l) -> HOV (attr, List.map (map f) l)
+  | Action (attr, l) -> Action (attr, List.map (map f) l)
+  | Object (attr, obj) -> Object (attr, f obj)
+;;
+
+(*
+let document_of_box ~obj2xml pres =
+ [< Xml.xml_cdata "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n" ;
+    Xml.xml_cdata "\n";
+    Xml.xml_nempty ~prefix "box"
+     [Some "xmlns","m","http://www.w3.org/1998/Math/MathML" ;
+      Some "xmlns","b","http://helm.cs.unibo.it/2003/BoxML" ;
+      Some "xmlns","helm","http://www.cs.unibo.it/helm" ;
+      Some "xmlns","xlink","http://www.w3.org/1999/xlink"
+     ] (print_box pres)
+ >]
+*)
+
+let b_h a b = H(a,b)
+let b_v a b = V(a,b)
+let b_hv a b = HV(a,b)
+let b_hov a b = HOV(a,b)
+let b_text a b = Text(a,b)
+let b_object b = Object ([],b)
+let b_indent = indent
+let b_space = Space [None, "width", "0.5em"]
+let b_kw = b_text (RenderingAttrs.object_keyword_attributes `BoxML)
+let b_toggle items = Action ([ None, "type", "toggle"], items)
+
+let pp_attr attr =
+  let pp (ns, n, v) =
+    Printf.sprintf "%s%s=%s" (match ns with None -> "" | Some s -> s ^ ":") n v
+  in
+  String.concat " " (List.map pp attr)
+
+let get_attr = function
+  | Text (attr, _)
+  | Space attr
+  | Ink attr
+  | H (attr, _)
+  | V (attr, _)
+  | HV (attr, _)
+  | HOV (attr, _)
+  | Object (attr, _)
+  | Action (attr, _) ->
+      attr
+
+let set_attr attr = function
+  | Text (_, x) -> Text (attr, x)
+  | Space _ -> Space attr
+  | Ink _ -> Ink attr
+  | H (_, x) -> H (attr, x)
+  | V (_, x) -> V (attr, x)
+  | HV (_, x) -> HV (attr, x)
+  | HOV (_, x) -> HOV (attr, x)
+  | Object (_, x) -> Object (attr, x)
+  | Action (_, x) -> Action (attr, x)
+