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|
(* $Id$
* ----------------------------------------------------------------------
*
*)
open Pxp_types
open Pxp_document
open Pxp_tree_parser
let empty_record = new element_impl (Pxp_yacc.default_extension);;
let empty_dnode = new data_impl Pxp_yacc.default_extension;;
class context the_filename the_obj_dtd the_index the_root the_topframe =
object (self)
val filename = the_filename
val obj_dtd = the_obj_dtd
val node_index = the_index
val mutable obj = empty_record # create_element
the_obj_dtd (T_element "record") []
val root = the_root
val topframe = the_topframe
val mutable wdg = None
val mutable history = ( [| |] : string array )
val mutable index = 0
initializer
self # load_obj
method obj = obj
(* history *)
method private leave_node =
begin match wdg with
None -> ()
| Some w -> Tk.destroy w
end;
wdg <- None
method private enter_node =
let where = history.(index) in
let n =
try node_index # find where with
Not_found -> failwith ("Mask not found: " ^ where) in
let w = n # extension # create_widget topframe self in
(* Tk.pack [w] (n # extension # pack_opts @ [ Tk.Expand true] ); *) (*X*)
n # extension # pack
?expand:(Some true) ?anchor:None ?fill:None ?side:None
[Widget.forget_type w];
wdg <- Some w
method previous =
if index > 0 then
index <- index - 1
else
raise Not_found;
self # leave_node;
self # enter_node;
method next =
if index < Array.length history - 1 then
index <- index + 1
else
raise Not_found;
self # leave_node;
self # enter_node;
method goto where =
assert (index <= Array.length history);
self # leave_node;
let persisting_history =
if index < Array.length history then
Array.sub history 0 (index+1)
else
history
in
history <- Array.concat [ persisting_history; [| where |] ];
index <- Array.length history - 1;
self # enter_node;
method current =
if index < Array.length history then
history.(index)
else
raise Not_found
(* read, write the slots of object *)
method search_slot name =
let rec search n =
match n # node_type with
T_element "string" ->
if n # required_string_attribute "name" = name then
n
else raise Not_found
| T_element _ ->
search_list (n # sub_nodes)
| T_data ->
raise Not_found
| _ ->
assert false
and search_list l =
match l with
x :: l' ->
(try search x with Not_found -> search_list l')
| [] ->
raise Not_found
in
search obj
method get_slot name =
let d = (self # search_slot name) # data in
d
method set_slot name value =
let dtd = obj # dtd in
begin try
let n = self # search_slot name in
n # delete
with
Not_found -> ()
end;
let e_string = empty_record # create_element dtd (T_element "string")
[ "name", name ] in
let dnode = empty_dnode # create_data dtd value in
e_string # add_node dnode;
e_string # local_validate();
obj # add_node e_string;
assert(self # get_slot name = value)
(* load, save object *)
method load_obj =
if Sys.file_exists filename then begin
obj <- parse_content_entity
default_config
(from_file filename)
obj_dtd
default_spec
end
else begin
print_string "New file!\n";
flush stdout
end
method save_obj =
let fd = open_out filename in
try
output_string fd "<?xml version='1.0' encoding='ISO-8859-1'?>\n";
obj # write (`Out_channel fd) `Enc_iso88591;
close_out fd
with
e ->
close_out fd;
raise e
end
;;
|
