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Ensure minimal structure tree in TOC

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John Whitington 2025-03-07 17:19:36 +00:00
parent f94fb702ec
commit 0e05b0f7d0
2 changed files with 18 additions and 1 deletions
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14
cpdftoc.ml
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@ -126,7 +126,6 @@ let remove_parent_tree_next_key pdf =
end end
| _ -> () | _ -> ()
(* 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. *) (* FIXME Again, replace_chain would be much better here if it could deal with a final indirect. *)
let add_to_parent_tree pdf p = let add_to_parent_tree pdf p =
match Pdf.lookup_chain pdf (Pdf.lookup_obj pdf pdf.Pdf.root) ["/StructTreeRoot"; "/ParentTree"] with match Pdf.lookup_chain pdf (Pdf.lookup_obj pdf pdf.Pdf.root) ["/StructTreeRoot"; "/ParentTree"] with
@ -146,12 +145,25 @@ let add_to_parent_tree pdf p =
n n
| None -> 0 | None -> 0
(* Make sure that there is an existing structure tree suitable for us to merge
into. Check for /StructTreeRoot. If there, nothing to do. Otherwise, build
<</Type/StructTreeRoot/ParentTree .../K[]>>. ParentTree and K actually
optional, but it's easier if we assume they are there. *)
let ensure_minimal_struct_tree pdf =
match Pdf.lookup_chain pdf (Pdf.lookup_obj pdf pdf.Pdf.root) ["/StructTreeRoot"] with
| Some _ -> ()
| None ->
let pt = Pdf.addobj pdf (Pdf.Dictionary [("/Nums", Pdf.Array [])]) in
let str = Pdf.Dictionary [("/Type", Pdf.Name "/StructTreeRoot"); ("/ParentTree", Pdf.Indirect pt); ("/K", Pdf.Array [])] in
Pdf.addobj_given_num pdf (pdf.Pdf.root, (Pdf.add_dict_entry (Pdf.lookup_obj pdf pdf.Pdf.root) "/StructTreeRoot" str))
(* Typeset a table of contents with given font, font size and title. Mediabox (* 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 (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 CropBox. Font size of title twice body font size. Null page labels added for
TOC, others bumped up and so preserved. *) TOC, others bumped up and so preserved. *)
let typeset_table_of_contents ~font ~fontsize ~title ~bookmark ~dotleader ~process_struct_tree pdf = let typeset_table_of_contents ~font ~fontsize ~title ~bookmark ~dotleader ~process_struct_tree pdf =
let optional l = if process_struct_tree then l else [] in let optional l = if process_struct_tree then l else [] in
if process_struct_tree then ensure_minimal_struct_tree pdf;
Hashtbl.clear width_table_cache; Hashtbl.clear width_table_cache;
let marks = Pdfmarks.read_bookmarks pdf in let marks = Pdfmarks.read_bookmarks pdf in
if marks = [] then (Pdfe.log "No bookmarks, not making table of contents\n"; pdf) else if marks = [] then (Pdfe.log "No bookmarks, not making table of contents\n"; pdf) else

5
cpdftype.ml
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@ -5,6 +5,11 @@
For now, this is just an experiment for -table-of-contents and -typeset. To For now, this is just an experiment for -table-of-contents and -typeset. To
be continued... *) be continued... *)
(* At the moment, structure tree support is limited. Cpdftoc.ml and
Cpdftexttopdf do it by post-processing. We need to fix this, which might
involve returning more than just a list of pages, but in fact working on the
document. *)
open Pdfutil open Pdfutil
(* Main type *) (* Main type *)