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Yojson reading

This commit is contained in:
John Whitington 2021-10-06 14:06:14 +01:00
parent b671b637bd
commit 588aa5f150
2 changed files with 107 additions and 133 deletions
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2
Makefile
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@ -18,7 +18,7 @@ OCAMLLDFLAGS = -g
all : native-code native-code-library byte-code-library top htdoc all : native-code native-code-library byte-code-library top htdoc
clean :: clean ::
rm -rf doc foo foo2 out.pdf out2.pdf *.cmt *.cmti *.json rm -rf doc foo foo2 out.pdf out2.pdf foo.pdf *.cmt *.cmti *.json
DOC_FILES = cpdferror.mli cpdfjson.mli cpdfstrftime.mli cpdfcoord.mli \ DOC_FILES = cpdferror.mli cpdfjson.mli cpdfstrftime.mli cpdfcoord.mli \
cpdfattach.mli cpdfpagespec.mli cpdfposition.mli cpdf.mli \ cpdfattach.mli cpdfpagespec.mli cpdfposition.mli cpdf.mli \

226
cpdfjson.ml
View File

@ -1,104 +1,106 @@
open Pdfutil open Pdfutil
open Cpdferror open Cpdferror
(*module J = Tjjson module J = Cpdfyojson.Safe
module P = Pdf
module O = Pdfops
let opf = function let opf = function
| J.Object ["F", J.Number f] -> float_of_string f | `Assoc ["F", `Float f] -> f
| `Assoc ["F", `Int i] -> float_of_int i
| _ -> error "num: not a float" | _ -> error "num: not a float"
let opi = function let opi = function
| J.Object ["I", J.Number i] -> int_of_string i | `Assoc ["I", `Int i] -> i
| _ -> error "num: not a float" | `Assoc ["I", `Float f] -> int_of_float f
| _ -> error "num: not an integer"
let rec op_of_json = function let rec op_of_json = function
| J.Array [J.String "S"] -> O.Op_S | `List [`String "S"] -> O.Op_S
| J.Array [J.String "s"] -> O.Op_s | `List [`String "s"] -> O.Op_s
| J.Array [J.String "f"] -> O.Op_f | `List [`String "f"] -> O.Op_f
| J.Array [J.String "F"] -> O.Op_F | `List [`String "F"] -> O.Op_F
| J.Array [J.String "f*"] -> O.Op_f' | `List [`String "f*"] -> O.Op_f'
| J.Array [J.String "B"] -> O.Op_B | `List [`String "B"] -> O.Op_B
| J.Array [J.String "B*"] -> O.Op_B' | `List [`String "B*"] -> O.Op_B'
| J.Array [J.String "b"] -> O.Op_b | `List [`String "b"] -> O.Op_b
| J.Array [J.String "b*"] -> O.Op_b' | `List [`String "b*"] -> O.Op_b'
| J.Array [J.String "n"] -> O.Op_n | `List [`String "n"] -> O.Op_n
| J.Array [J.String "W"] -> O.Op_W | `List [`String "W"] -> O.Op_W
| J.Array [J.String "W*"] -> O.Op_W' | `List [`String "W*"] -> O.Op_W'
| J.Array [J.String "BT"] -> O.Op_BT | `List [`String "BT"] -> O.Op_BT
| J.Array [J.String "ET"] -> O.Op_ET | `List [`String "ET"] -> O.Op_ET
| J.Array [J.String "q"] -> O.Op_q | `List [`String "q"] -> O.Op_q
| J.Array [J.String "Q"] -> O.Op_Q | `List [`String "Q"] -> O.Op_Q
| J.Array [J.String "h"] -> O.Op_h | `List [`String "h"] -> O.Op_h
| J.Array [J.String "T*"] -> O.Op_T' | `List [`String "T*"] -> O.Op_T'
| J.Array [J.String "EMC"] -> O.Op_EMC | `List [`String "EMC"] -> O.Op_EMC
| J.Array [J.String "BX"] -> O.Op_BX | `List [`String "BX"] -> O.Op_BX
| J.Array [J.String "EX"] -> O.Op_EX | `List [`String "EX"] -> O.Op_EX
| J.Array [a; b; c; d; J.String "re"] -> O.Op_re (opf a, opf b, opf c, opf d) | `List [a; b; c; d; `String "re"] -> O.Op_re (opf a, opf b, opf c, opf d)
| J.Array [a; b; c; d; J.String "k"] -> O.Op_k (opf a, opf b, opf c, opf d) | `List [a; b; c; d; `String "k"] -> O.Op_k (opf a, opf b, opf c, opf d)
| J.Array [a; b; J.String "m"] -> O.Op_m (opf a, opf b) | `List [a; b; `String "m"] -> O.Op_m (opf a, opf b)
| J.Array [a; b; J.String "l"] -> O.Op_l (opf a, opf b) | `List [a; b; `String "l"] -> O.Op_l (opf a, opf b)
| J.Array [J.String s; obj; J.String "BDC"] -> O.Op_BDC (s, object_of_json obj) | `List [`String s; obj; `String "BDC"] -> O.Op_BDC (s, object_of_json obj)
| J.Array [J.String s; J.String "gs"] -> O.Op_gs s | `List [`String s; `String "gs"] -> O.Op_gs s
| J.Array [J.String s; J.String "Do"] -> O.Op_Do s | `List [`String s; `String "Do"] -> O.Op_Do s
| J.Array [J.String s; J.String "CS"] -> O.Op_CS s | `List [`String s; `String "CS"] -> O.Op_CS s
| J.Array [i; J.String "j"] -> O.Op_j (opi i) | `List [i; `String "j"] -> O.Op_j (opi i)
| J.Array [a; b; c; d; e; f; J.String "cm"] -> | `List [a; b; c; d; e; f; `String "cm"] ->
O.Op_cm O.Op_cm
{Pdftransform.a = opf a; Pdftransform.b = opf b; Pdftransform.c = opf c; {Pdftransform.a = opf a; Pdftransform.b = opf b; Pdftransform.c = opf c;
Pdftransform.d = opf d; Pdftransform.e = opf e; Pdftransform.f = opf f} Pdftransform.d = opf d; Pdftransform.e = opf e; Pdftransform.f = opf f}
| J.Array [J.Array fls; y; J.String "d"] -> O.Op_d (map opf fls, opf y) | `List [`List fls; y; `String "d"] -> O.Op_d (map opf fls, opf y)
| J.Array [a; J.String "w"] -> O.Op_w (opf a) | `List [a; `String "w"] -> O.Op_w (opf a)
| J.Array [a; J.String "J"] -> O.Op_J (opi a) | `List [a; `String "J"] -> O.Op_J (opi a)
| J.Array [a; J.String "M"] -> O.Op_M (opf a) | `List [a; `String "M"] -> O.Op_M (opf a)
| J.Array [J.String s; J.String "ri"] -> O.Op_ri s | `List [`String s; `String "ri"] -> O.Op_ri s
| J.Array [a; J.String "i"] -> O.Op_i (opi a) | `List [a; `String "i"] -> O.Op_i (opi a)
| J.Array [a; b; c; d; e; f; J.String "c"] -> O.Op_c (opf a, opf b, opf c, opf d, opf e, opf f) | `List [a; b; c; d; e; f; `String "c"] -> O.Op_c (opf a, opf b, opf c, opf d, opf e, opf f)
| J.Array [a; b; c; d; J.String "v"] -> O.Op_v (opf a, opf b, opf c, opf d) | `List [a; b; c; d; `String "v"] -> O.Op_v (opf a, opf b, opf c, opf d)
| J.Array [a; b; c; d; J.String "y"] -> O.Op_y (opf a, opf b, opf c, opf d) | `List [a; b; c; d; `String "y"] -> O.Op_y (opf a, opf b, opf c, opf d)
| J.Array [a; J.String "Tc"] -> O.Op_Tc (opf a) | `List [a; `String "Tc"] -> O.Op_Tc (opf a)
| J.Array [a; J.String "Tw"] -> O.Op_Tw (opf a) | `List [a; `String "Tw"] -> O.Op_Tw (opf a)
| J.Array [a; J.String "Tz"] -> O.Op_Tz (opf a) | `List [a; `String "Tz"] -> O.Op_Tz (opf a)
| J.Array [a; J.String "TL"] -> O.Op_TL (opf a) | `List [a; `String "TL"] -> O.Op_TL (opf a)
| J.Array [J.String k; n; J.String "Tf"] -> O.Op_Tf (k, opf n) | `List [`String k; n; `String "Tf"] -> O.Op_Tf (k, opf n)
| J.Array [a; J.String "Tr"] -> O.Op_Tr (opi a) | `List [a; `String "Tr"] -> O.Op_Tr (opi a)
| J.Array [a; J.String "Ts"] -> O.Op_Ts (opf a) | `List [a; `String "Ts"] -> O.Op_Ts (opf a)
| J.Array [a; b; J.String "Td"] -> O.Op_Td (opf a, opf b) | `List [a; b; `String "Td"] -> O.Op_Td (opf a, opf b)
| J.Array [a; b; J.String "TD"] -> O.Op_TD (opf a, opf b) | `List [a; b; `String "TD"] -> O.Op_TD (opf a, opf b)
| J.Array [a; b; c; d; e; f; J.String "Tm"] -> | `List [a; b; c; d; e; f; `String "Tm"] ->
O.Op_Tm O.Op_Tm
{Pdftransform.a = opf a; Pdftransform.b = opf b; Pdftransform.c = opf c; {Pdftransform.a = opf a; Pdftransform.b = opf b; Pdftransform.c = opf c;
Pdftransform.d = opf d; Pdftransform.e = opf e; Pdftransform.f = opf f} Pdftransform.d = opf d; Pdftransform.e = opf e; Pdftransform.f = opf f}
| J.Array [J.String s; J.String "Tj"] -> Op_Tj s | `List [`String s; `String "Tj"] -> Op_Tj s
| J.Array [obj; J.String "TJ"] -> Op_TJ (object_of_json obj) | `List [obj; `String "TJ"] -> Op_TJ (object_of_json obj)
| J.Array [J.String s; J.String "'"] -> Op_' s | `List [`String s; `String "'"] -> Op_' s
| J.Array [a; b; J.String s; J.String "''"] -> Op_'' (opf a, opf b, s) | `List [a; b; `String s; `String "''"] -> Op_'' (opf a, opf b, s)
| J.Array [a; b; J.String "d0"] -> Op_d0 (opf a, opf b) | `List [a; b; `String "d0"] -> Op_d0 (opf a, opf b)
| J.Array [a; b; c; d; e; f; J.String "d1"] -> Op_d1 (opf a, opf b, opf c, opf d, opf e, opf f) | `List [a; b; c; d; e; f; `String "d1"] -> Op_d1 (opf a, opf b, opf c, opf d, opf e, opf f)
| J.Array [J.String s; J.String "cs"] -> Op_cs s | `List [`String s; `String "cs"] -> Op_cs s
| J.Array [a; J.String "G"] -> Op_G (opf a); | `List [a; `String "G"] -> Op_G (opf a);
| J.Array [a; J.String "g"] -> Op_g (opf a); | `List [a; `String "g"] -> Op_g (opf a);
| J.Array [a; b; c; J.String "RG"] -> Op_RG (opf a, opf b, opf c); | `List [a; b; c; `String "RG"] -> Op_RG (opf a, opf b, opf c);
| J.Array [a; b; c; J.String "rg"] -> Op_rg (opf a, opf b, opf c); | `List [a; b; c; `String "rg"] -> Op_rg (opf a, opf b, opf c);
| J.Array [a; b; c; d; J.String "K"] -> Op_K (opf a, opf b, opf c, opf d); | `List [a; b; c; d; `String "K"] -> Op_K (opf a, opf b, opf c, opf d);
| J.Array [J.String s; J.String "sh"] -> Op_sh s; | `List [`String s; `String "sh"] -> Op_sh s;
| J.Array [J.String s; J.String "MP"] -> Op_MP s; | `List [`String s; `String "MP"] -> Op_MP s;
| J.Array [J.String s; J.String "BMC"] -> Op_BMC s; | `List [`String s; `String "BMC"] -> Op_BMC s;
| J.Array [J.String s; J.String "Unknown"] -> O.Op_Unknown s | `List [`String s; `String "Unknown"] -> O.Op_Unknown s
| J.Array [J.String s; obj; J.String "DP"] -> O.Op_DP (s, object_of_json obj) | `List [`String s; obj; `String "DP"] -> O.Op_DP (s, object_of_json obj)
| J.Array [a; J.String b; J.String "InlineImage"] -> | `List [a; `String b; `String "InlineImage"] ->
O.InlineImage (object_of_json a, Pdfio.bytes_of_string b) O.InlineImage (object_of_json a, Pdfio.bytes_of_string b)
| J.Array torev -> | `List torev ->
begin match rev torev with begin match rev torev with
| J.String "SCN"::ns -> O.Op_SCN (map opf (rev ns)) | `String "SCN"::ns -> O.Op_SCN (map opf (rev ns))
| J.String "SC"::ns -> O.Op_SCN (map opf (rev ns)) | `String "SC"::ns -> O.Op_SCN (map opf (rev ns))
| J.String "sc"::ns -> O.Op_SCN (map opf (rev ns)) | `String "sc"::ns -> O.Op_SCN (map opf (rev ns))
| J.String "scn"::ns -> O.Op_SCN (map opf (rev ns)) | `String "scn"::ns -> O.Op_SCN (map opf (rev ns))
| J.String "SCNName"::J.String s::ns -> O.Op_SCNName (s, map opf (rev ns)) | `String "SCNName"::`String s::ns -> O.Op_SCNName (s, map opf (rev ns))
| J.String "scnName"::J.String s::ns -> O.Op_scnName (s, map opf (rev ns)) | `String "scnName"::`String s::ns -> O.Op_scnName (s, map opf (rev ns))
| j -> | j ->
Printf.eprintf "Unable to read reversed op from %s\n" (J.show (J.Array j)); Printf.eprintf "Unable to read reversed op from %s\n" (J.show (`List j));
error "op reading failed" error "op reading failed"
end end
| j -> | j ->
@ -106,37 +108,34 @@ let rec op_of_json = function
error "op reading failed" error "op reading failed"
and object_of_json = function and object_of_json = function
| J.Null -> P.Null | `Null -> P.Null
| J.Bool b -> P.Boolean b | `Bool b -> P.Boolean b
| J.Number n -> Pdf.Indirect (int_of_string n) | `Int n -> Pdf.Indirect n
| J.String s -> P.String s | `String s -> P.String s
| J.Array objs -> P.Array (map object_of_json objs) | `List objs -> P.Array (map object_of_json objs)
| J.Object ["I", J.Number i] -> P.Integer (int_of_string i) | `Assoc ["I", `Int i] -> P.Integer i
| J.Object ["F", J.Number f] -> P.Real (float_of_string f) | `Assoc ["F", `Float f] -> P.Real f
| J.Object ["N", J.String n] -> P.Name n | `Assoc ["N", `String n] -> P.Name n
| J.Object ["S", J.Array [dict; J.String data]] -> | `Assoc ["S", `List [dict; `String data]] ->
(* Fix up the length, in case it's been edited. *) (* Fix up the length, in case it's been edited. *)
let d' = let d' =
P.add_dict_entry (object_of_json dict) "/Length" (P.Integer (String.length data)) P.add_dict_entry (object_of_json dict) "/Length" (P.Integer (String.length data))
in in
P.Stream (ref (d', P.Got (Pdfio.bytes_of_string data))) P.Stream (ref (d', P.Got (Pdfio.bytes_of_string data)))
| J.Object ["S", J.Array [dict; J.Array parsed_ops]] -> | `Assoc ["S", `List [dict; `List parsed_ops]] ->
Pdfops.stream_of_ops (List.map op_of_json parsed_ops) Pdfops.stream_of_ops (List.map op_of_json parsed_ops)
| J.Object elts -> P.Dictionary (map (fun (n, o) -> (n, object_of_json o)) elts) | `Assoc elts -> P.Dictionary (map (fun (n, o) -> (n, object_of_json o)) elts)
| _ -> error "not recognised in object_of_json"
let pdf_of_json json = let pdf_of_json json =
(*flprint (J.show json); flprint "\n";*) (*flprint (J.show json); flprint "\n";*)
let objs = match json with J.Array objs -> objs | _ -> error "bad json top level" in let objs = match json with `List objs -> objs | _ -> error "bad json top level" in
let params = ref Pdf.Null in let params = ref Pdf.Null in
let trailerdict = ref Pdf.Null in let trailerdict = ref Pdf.Null in
let objects = let objects =
option_map option_map
(function (function
| J.Array [J.Number n; o] -> | `List [`Int objnum; o] ->
let objnum = int_of_string n in
begin match objnum with begin match objnum with
| -1 -> params := object_of_json o; None | -1 -> params := object_of_json o; None
| 0 -> trailerdict := object_of_json o; None | 0 -> trailerdict := object_of_json o; None
@ -183,19 +182,6 @@ let pdf_of_json json =
P.was_linearized = false; P.was_linearized = false;
P.saved_encryption = None} P.saved_encryption = None}
(* FIXME Proper streaming to output / from input, rather than making a big string first. *)
let to_output o parse_content no_stream_data decompress_streams pdf =
let b = Buffer.create 256 in
let formatter = Format.formatter_of_buffer b in
J.format formatter (json_of_pdf parse_content no_stream_data decompress_streams pdf);
Format.pp_print_flush formatter ();
o.Pdfio.output_string (Buffer.contents b)
*)
module J = Cpdfyojson
module P = Pdf
module O = Pdfops
let rec json_of_object pdf fcs no_stream_data = function let rec json_of_object pdf fcs no_stream_data = function
| P.Null -> `Null | P.Null -> `Null
| P.Boolean b -> `Bool b | P.Boolean b -> `Bool b
@ -344,12 +330,10 @@ let json_of_op pdf no_stream_data = function
| O.Op_DP (s, obj) -> | O.Op_DP (s, obj) ->
`List [`String s; json_of_object pdf (fun _ -> ()) no_stream_data obj; `String "DP"] `List [`String s; json_of_object pdf (fun _ -> ()) no_stream_data obj; `String "DP"]
(* parse_stream needs pdf and resources. These are for lexing of inline images, (* parse_stream needs pdf and resources. These are for lexing of inline images,
* looking up the colourspace. We do not need to worry about inherited * looking up the colourspace. We do not need to worry about inherited
* resources, though? For now, don't worry about inherited resources: check in * resources, though? For now, don't worry about inherited resources: check in
* PDF standard. *) * PDF standard. *)
let parse_content_stream pdf resources bs = let parse_content_stream pdf resources bs =
let ops = O.parse_stream pdf resources [bs] in let ops = O.parse_stream pdf resources [bs] in
`List (map (json_of_op pdf false) ops) `List (map (json_of_op pdf false) ops)
@ -437,17 +421,7 @@ let to_output o parse_content no_stream_data decompress_streams pdf =
let json = json_of_pdf parse_content no_stream_data decompress_streams pdf in let json = json_of_pdf parse_content no_stream_data decompress_streams pdf in
o.Pdfio.output_string (J.pretty_to_string json) o.Pdfio.output_string (J.pretty_to_string json)
let example_pdf =
let page =
{(Pdfpage.blankpage Pdfpaper.a4) with
Pdfpage.content = [Pdfops.stream_of_ops []];
Pdfpage.resources = Pdf.Dictionary []}
in
let pdf, pageroot = Pdfpage.add_pagetree (many page 1) (Pdf.empty ()) in
Pdfpage.add_root pageroot [] pdf
(* FIXME Proper streaming to output / from input, rather than making a big string first. *) (* FIXME Proper streaming to output / from input, rather than making a big string first. *)
let of_input i = let of_input i =
(*pdf_of_json*) let content = Pdfio.string_of_bytes (Pdfio.bytes_of_input i 0 (i.Pdfio.in_channel_length)) in
(*ignore (J.parse (Pdfio.string_of_bytes (Pdfio.bytes_of_input i 0 (i.Pdfio.in_channel_length))));*) pdf_of_json (J.from_string content)
example_pdf