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Towards TOC

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John Whitington
2025-03-06 14:07:28 +00:00
parent d88c245c18
commit 091561cb25
1 changed files with 50 additions and 23 deletions
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73
cpdftoc.ml
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@ -111,6 +111,26 @@ let prepend_structitems pdf items =
Pdf.replace_chain pdf ["/Root"; "/StructTreeRoot"; "/K"] (Pdf.Array (items @ [Pdf.Dictionary d]))
| _ -> ()
(* FIXME Again relies upon there being an existing structure tree. Fix. *)
(* FIXME Again, replace_chain would be much better here if it could deal with a final indirect. *)
let add_to_parent_tree pdf p =
match Pdf.lookup_chain pdf (Pdf.lookup_obj pdf pdf.Pdf.root) ["/StructTreeRoot"; "/ParentTree"] with
| Some tree ->
let t = Pdftree.read_number_tree pdf tree in
let n = match t with [] -> 0 | l -> int_of_string (fst (last l)) + 1 in
let newtree = Pdftree.build_name_tree true pdf ((string_of_int n, p)::t) in
begin match Pdf.lookup_direct pdf "/StructTreeRoot" (Pdf.lookup_obj pdf pdf.Pdf.root) with
| Some (Pdf.Dictionary d) ->
begin match lookup "/ParentTree" d with
| Some (Pdf.Indirect i) ->
Pdf.addobj_given_num pdf (i, newtree)
| _ -> ()
end
| _ -> ()
end;
n
| None -> 0
(* Typeset a table of contents with given font, font size and title. Mediabox
(and CropBox) copied from first page of existing PDF. Margin of 10% inside
CropBox. Font size of title twice body font size. Null page labels added for
@ -226,7 +246,7 @@ let typeset_table_of_contents ~font ~fontsize ~title ~bookmark ~dotleader ~proce
2) One for each link:
link = <</Type /StructElem /S /Link /K [<mcid> <objr>]>>
objr = <</Type /ObjR /Obj <linkannot>>>
Then we have to graft them onto the file's existing structure tree *)
Then we have to graft them onto the file's existing structure tree. *)
(*iter (fun x -> Printf.printf "PAGE\n"; iter (fun (_, i) -> Printf.printf "Paragraph number %i\n" i) x) toc_tags;*)
let struct_tree_root =
match Pdf.lookup_immediate "/StructTreeRoot" (Pdf.lookup_obj pdf pdf.Pdf.root) with
@ -240,33 +260,40 @@ let typeset_table_of_contents ~font ~fontsize ~title ~bookmark ~dotleader ~proce
("/K", Pdf.Array [Pdf.Integer 0]);
("/P", Pdf.Indirect struct_tree_root)])
in
let mcid = ref 1 in
let link_struct_elems_for_each_page =
flatten
(map
(fun page ->
let annot_objnums =
match Pdf.lookup_direct pdf "/Annots" page.Pdfpage.rest with
| Some (Pdf.Array a) -> map (function Pdf.Indirect i -> i | _ -> 0) a
| _ -> []
in
let r = map
(fun annot_i ->
let r =
let objr = Pdf.addobj pdf (Pdf.Dictionary [("/Type", Pdf.Name "/OBJR"); ("/Obj", Pdf.Indirect annot_i)]) in
Pdf.addobj pdf
(Pdf.Dictionary [("/S", Pdf.Name "/Link");
("/K", Pdf.Array [Pdf.Integer !mcid; Pdf.Indirect objr])])
in
incr mcid; r)
annot_objnums
in
mcid := 0; r)
toc_pages)
map
(fun page ->
let annot_objnums =
match Pdf.lookup_direct pdf "/Annots" page.Pdfpage.rest with
| Some (Pdf.Array a) -> map (function Pdf.Indirect i -> i | _ -> 0) a
| _ -> []
in
let r = map
(fun annot_i ->
let r =
let objr = Pdf.addobj pdf (Pdf.Dictionary [("/Type", Pdf.Name "/OBJR"); ("/Obj", Pdf.Indirect annot_i)]) in
Pdf.addobj pdf
(Pdf.Dictionary [("/S", Pdf.Name "/Link");
("/K", Pdf.Array [Pdf.Integer !mcid; Pdf.Indirect objr])])
in
incr mcid; r)
annot_objnums
in
mcid := 0; r)
toc_pages
in
let prepending_structitems =
map (fun x -> Pdf.Indirect x) (p_struct_elem_first_page::link_struct_elems_for_each_page)
map (fun x -> Pdf.Indirect x) (p_struct_elem_first_page::flatten link_struct_elems_for_each_page)
in
(* Add the key and value structure item (any p, and that page's links) to the parent tree for each TOC page *)
iter
(fun o ->
let page = Pdf.lookup_obj pdf o in
let ptn = add_to_parent_tree pdf (Pdf.Array []) in
Pdf.addobj_given_num pdf (o, Pdf.add_dict_entry page "/StructParents" (Pdf.Integer ptn)))
toc_pageobjnums;
begin match Pdf.lookup_chain pdf pdf.Pdf.trailerdict ["/Root"; "/StructTreeRoot"; "/K"] with
| Some (Pdf.Array a) ->
Pdf.replace_chain pdf ["/Root"; "/StructTreeRoot"; "/K"] (Pdf.Array (prepending_structitems @ a))