'expr box =
Text of attr * string
| Space of attr
+ | Ink of attr
| H of attr * ('expr box) list
| V of attr * ('expr box) list
| Object of attr * 'expr
and attr = (string option * string * string) list
-let smallskip = Text([]," ");;
-let skip = Text([]," ");;
+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 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) ->
+ X.xml_nempty ~prefix "h" attr
+ [< (List.fold_right (fun x i -> [< (aux x) ; i >]) l [<>])
+ >]
+ | V (attr,l) ->
+ X.xml_nempty ~prefix "v" 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)
+ | 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_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 [None, "color", "red"]
+