50 lines
1.7 KiB
OCaml
50 lines
1.7 KiB
OCaml
|
open Pdfutil
|
||
|
|
|
||
|
|
|
||
|
|
(* Split the given range (which is in order) into multiple contiguous ones. *)
|
||
|
|
let rec ranges_of_range curr prev = function
|
||
|
|
| [] -> begin match curr with [] -> rev prev | _ -> rev (rev curr::prev) end
|
||
|
|
| x::xs ->
|
||
|
|
match curr with
|
||
|
|
| [] -> ranges_of_range [x] prev xs
|
||
|
|
| c::cs when x = c + 1 -> ranges_of_range (x::curr) prev xs
|
||
|
|
| cs -> ranges_of_range [x] (rev cs::prev) xs
|
||
|
|
|
||
|
|
(* Predicate which is true if at least one page range starts at page 1 *)
|
||
|
|
let page1 labels =
|
||
|
|
mem true (map (function l -> l.Pdfpagelabels.startpage = 1) labels)
|
||
|
|
|
||
|
|
let add_page_labels pdf progress style prefix startval range =
|
||
|
|
let ranges = map extremes (ranges_of_range [] [] range)
|
||
|
|
and labels = Pdfpagelabels.read pdf in
|
||
|
|
assert (length ranges > 0);
|
||
|
|
let startval_additions =
|
||
|
|
let r = ref [] in
|
||
|
|
let sofar = ref 0 in
|
||
|
|
iter (fun (s, e) -> r := !sofar :: !r; sofar := e - s + 1 + !sofar) ranges;
|
||
|
|
rev !r
|
||
|
|
in
|
||
|
|
let labels =
|
||
|
|
if not (page1 labels) then
|
||
|
|
ref
|
||
|
|
({Pdfpagelabels.labelstyle = Pdfpagelabels.DecimalArabic;
|
||
|
|
Pdfpagelabels.labelprefix = None;
|
||
|
|
Pdfpagelabels.startpage = 1;
|
||
|
|
Pdfpagelabels.startvalue = 1}::labels)
|
||
|
|
else
|
||
|
|
ref labels
|
||
|
|
in
|
||
|
|
iter2
|
||
|
|
(fun (s, e) addition ->
|
||
|
|
let label =
|
||
|
|
{Pdfpagelabels.labelstyle = style;
|
||
|
|
Pdfpagelabels.labelprefix = prefix;
|
||
|
|
Pdfpagelabels.startpage = s;
|
||
|
|
Pdfpagelabels.startvalue = startval + if progress then addition else 0}
|
||
|
|
in
|
||
|
|
labels := Pdfpagelabels.add_label (Pdfpage.endpage pdf) !labels label e)
|
||
|
|
ranges
|
||
|
|
startval_additions;
|
||
|
|
Pdfpagelabels.write pdf !labels
|
||
|
|
|