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Natural language

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John Whitington 2025-01-20 14:28:26 +08:00
parent 161276ebb3
commit 14d2e211dc
1 changed files with 11 additions and 14 deletions
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cpdfua.ml
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@ -5,10 +5,14 @@ open Cpdferror
deep inside font files. Implemented except:
Partially implemented:
31-009 31-027 Fonts
31-009 31-027 Can require looking inside font files
11-001 11-002 11-003 11-004 11-005 Natural Language (We just check for
top-level document language - PDF/UA2 requires it, and we have no example
files without it.)
Unimplemented:
10-001 Character code to unicode extraction
11-001 11-002 11-003 11-004 11-005 Natural Language
31-007 31-008 31-011 31-012 31-013 31-014 31-015 31-016 31-018 31-030 Fonts *)
type subformat =
@ -444,14 +448,13 @@ 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? *)
(* If the top-level /Lang is present, that rules all and is sufficient. *)
(* Natural language for text in page content cannot be determined. *)
let matterhorn_11_001 _ _ pdf =
unimpl ()
match Pdf.lookup_chain pdf pdf.Pdf.trailerdict ["/Root"; "/Lang"] with
| Some (Pdf.String "") | None -> merror_str "No top-level /Lang"
| Some _ -> ()
(* Natural language for text in Alt, ActualText and E attributes cannot be
determined. *)
@ -469,13 +472,7 @@ let matterhorn_11_005 _ _ pdf = unimpl ()
(* Natural language for document metadata cannot be determined. *)
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 _ -> ()
unimpl ()
(* <Figure> tag alternative or replacement text missing. *)
let matterhorn_13_004 _ st2 pdf =