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