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Basic natural language check

This commit is contained in:
John Whitington 2024-06-24 14:50:10 +01:00
parent 707578d724
commit 0a774c9a88
1 changed files with 13 additions and 1 deletions
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14
cpdfua.ml
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@ -348,6 +348,11 @@ let matterhorn_09_008 st st2 pdf =
let matterhorn_10_001 _ _ pdf =
unimpl ()
(* Not clear what to do for 001...005 here - if the top-level /Lang is present,
that rules all and is sufficient. So how could these then fail? Perhaps they
mean if an intervening one has "" as the lang - i.e unknown. Or, if it is
not on the ISO 3066 registry list? *)
(* Natural language for text in page content cannot be determined. *)
let matterhorn_11_001 _ _ pdf =
unimpl ()
@ -367,7 +372,14 @@ let matterhorn_11_004 _ _ pdf = unimpl ()
let matterhorn_11_005 _ _ pdf = unimpl ()
(* Natural language for document metadata cannot be determined. *)
let matterhorn_11_006 _ _ pdf = unimpl ()
let matterhorn_11_006 _ _ pdf =
(* Per 2008 14.9.2.1-2, document metadata language is simply determined by
the top-level /Lang. In theory, one could omit the top-level /Lang and use
xml:lang everywhere in the metadata, but we haven't seen an example which
omits top-level /Lang so this will do for now. *)
match Pdf.lookup_chain pdf pdf.Pdf.trailerdict ["/Root"; "/Lang"] with
| Some (Pdf.String "") | None -> merror_str "No top-level /Lang"
| Some _ -> ()
(* <Figure> tag alternative or replacement text missing. *)
let matterhorn_13_004 _ st2 pdf =