From 588aa5f15001189d09e8fedf7dfe3b0cba1f17c9 Mon Sep 17 00:00:00 2001 From: John Whitington Date: Wed, 6 Oct 2021 14:06:14 +0100 Subject: [PATCH] Yojson reading --- Makefile | 2 +- cpdfjson.ml | 238 +++++++++++++++++++++++----------------------------- 2 files changed, 107 insertions(+), 133 deletions(-) diff --git a/Makefile b/Makefile index 2f4836a..be3e85f 100644 --- a/Makefile +++ b/Makefile @@ -18,7 +18,7 @@ OCAMLLDFLAGS = -g all : native-code native-code-library byte-code-library top htdoc 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 \ cpdfattach.mli cpdfpagespec.mli cpdfposition.mli cpdf.mli \ diff --git a/cpdfjson.ml b/cpdfjson.ml index 8a4b78b..a6afad0 100644 --- a/cpdfjson.ml +++ b/cpdfjson.ml @@ -1,104 +1,106 @@ open Pdfutil open Cpdferror -(*module J = Tjjson - - +module J = Cpdfyojson.Safe +module P = Pdf +module O = Pdfops 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" let opi = function - | J.Object ["I", J.Number i] -> int_of_string i - | _ -> error "num: not a float" + | `Assoc ["I", `Int i] -> i + | `Assoc ["I", `Float f] -> int_of_float f + | _ -> error "num: not an integer" let rec op_of_json = function - | J.Array [J.String "S"] -> O.Op_S - | J.Array [J.String "s"] -> O.Op_s - | J.Array [J.String "f"] -> O.Op_f - | J.Array [J.String "F"] -> O.Op_F - | J.Array [J.String "f*"] -> O.Op_f' - | J.Array [J.String "B"] -> O.Op_B - | J.Array [J.String "B*"] -> O.Op_B' - | J.Array [J.String "b"] -> O.Op_b - | J.Array [J.String "b*"] -> O.Op_b' - | J.Array [J.String "n"] -> O.Op_n - | J.Array [J.String "W"] -> O.Op_W - | J.Array [J.String "W*"] -> O.Op_W' - | J.Array [J.String "BT"] -> O.Op_BT - | J.Array [J.String "ET"] -> O.Op_ET - | J.Array [J.String "q"] -> O.Op_q - | J.Array [J.String "Q"] -> O.Op_Q - | J.Array [J.String "h"] -> O.Op_h - | J.Array [J.String "T*"] -> O.Op_T' - | J.Array [J.String "EMC"] -> O.Op_EMC - | J.Array [J.String "BX"] -> O.Op_BX - | J.Array [J.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) - | J.Array [a; b; c; d; J.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) - | J.Array [a; b; J.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) - | J.Array [J.String s; J.String "gs"] -> O.Op_gs s - | J.Array [J.String s; J.String "Do"] -> O.Op_Do s - | J.Array [J.String s; J.String "CS"] -> O.Op_CS s - | J.Array [i; J.String "j"] -> O.Op_j (opi i) - | J.Array [a; b; c; d; e; f; J.String "cm"] -> + | `List [`String "S"] -> O.Op_S + | `List [`String "s"] -> O.Op_s + | `List [`String "f"] -> O.Op_f + | `List [`String "F"] -> O.Op_F + | `List [`String "f*"] -> O.Op_f' + | `List [`String "B"] -> O.Op_B + | `List [`String "B*"] -> O.Op_B' + | `List [`String "b"] -> O.Op_b + | `List [`String "b*"] -> O.Op_b' + | `List [`String "n"] -> O.Op_n + | `List [`String "W"] -> O.Op_W + | `List [`String "W*"] -> O.Op_W' + | `List [`String "BT"] -> O.Op_BT + | `List [`String "ET"] -> O.Op_ET + | `List [`String "q"] -> O.Op_q + | `List [`String "Q"] -> O.Op_Q + | `List [`String "h"] -> O.Op_h + | `List [`String "T*"] -> O.Op_T' + | `List [`String "EMC"] -> O.Op_EMC + | `List [`String "BX"] -> O.Op_BX + | `List [`String "EX"] -> O.Op_EX + | `List [a; b; c; d; `String "re"] -> O.Op_re (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) + | `List [a; b; `String "m"] -> O.Op_m (opf a, opf b) + | `List [a; b; `String "l"] -> O.Op_l (opf a, opf b) + | `List [`String s; obj; `String "BDC"] -> O.Op_BDC (s, object_of_json obj) + | `List [`String s; `String "gs"] -> O.Op_gs s + | `List [`String s; `String "Do"] -> O.Op_Do s + | `List [`String s; `String "CS"] -> O.Op_CS s + | `List [i; `String "j"] -> O.Op_j (opi i) + | `List [a; b; c; d; e; f; `String "cm"] -> O.Op_cm {Pdftransform.a = opf a; Pdftransform.b = opf b; Pdftransform.c = opf c; 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) - | J.Array [a; J.String "w"] -> O.Op_w (opf a) - | J.Array [a; J.String "J"] -> O.Op_J (opi a) - | J.Array [a; J.String "M"] -> O.Op_M (opf a) - | J.Array [J.String s; J.String "ri"] -> O.Op_ri s - | J.Array [a; J.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) - | J.Array [a; b; c; d; J.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) - | J.Array [a; J.String "Tc"] -> O.Op_Tc (opf a) - | J.Array [a; J.String "Tw"] -> O.Op_Tw (opf a) - | J.Array [a; J.String "Tz"] -> O.Op_Tz (opf a) - | J.Array [a; J.String "TL"] -> O.Op_TL (opf a) - | J.Array [J.String k; n; J.String "Tf"] -> O.Op_Tf (k, opf n) - | J.Array [a; J.String "Tr"] -> O.Op_Tr (opi a) - | J.Array [a; J.String "Ts"] -> O.Op_Ts (opf a) - | J.Array [a; b; J.String "Td"] -> O.Op_Td (opf a, opf b) - | J.Array [a; b; J.String "TD"] -> O.Op_TD (opf a, opf b) - | J.Array [a; b; c; d; e; f; J.String "Tm"] -> + | `List [`List fls; y; `String "d"] -> O.Op_d (map opf fls, opf y) + | `List [a; `String "w"] -> O.Op_w (opf a) + | `List [a; `String "J"] -> O.Op_J (opi a) + | `List [a; `String "M"] -> O.Op_M (opf a) + | `List [`String s; `String "ri"] -> O.Op_ri s + | `List [a; `String "i"] -> O.Op_i (opi a) + | `List [a; b; c; d; e; f; `String "c"] -> O.Op_c (opf a, opf b, opf c, opf d, opf e, opf f) + | `List [a; b; c; d; `String "v"] -> O.Op_v (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) + | `List [a; `String "Tc"] -> O.Op_Tc (opf a) + | `List [a; `String "Tw"] -> O.Op_Tw (opf a) + | `List [a; `String "Tz"] -> O.Op_Tz (opf a) + | `List [a; `String "TL"] -> O.Op_TL (opf a) + | `List [`String k; n; `String "Tf"] -> O.Op_Tf (k, opf n) + | `List [a; `String "Tr"] -> O.Op_Tr (opi a) + | `List [a; `String "Ts"] -> O.Op_Ts (opf a) + | `List [a; b; `String "Td"] -> O.Op_Td (opf a, opf b) + | `List [a; b; `String "TD"] -> O.Op_TD (opf a, opf b) + | `List [a; b; c; d; e; f; `String "Tm"] -> O.Op_Tm {Pdftransform.a = opf a; Pdftransform.b = opf b; Pdftransform.c = opf c; Pdftransform.d = opf d; Pdftransform.e = opf e; Pdftransform.f = opf f} - | J.Array [J.String s; J.String "Tj"] -> Op_Tj s - | J.Array [obj; J.String "TJ"] -> Op_TJ (object_of_json obj) - | J.Array [J.String s; J.String "'"] -> Op_' s - | J.Array [a; b; J.String s; J.String "''"] -> Op_'' (opf a, opf b, s) - | J.Array [a; b; J.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) - | J.Array [J.String s; J.String "cs"] -> Op_cs s - | J.Array [a; J.String "G"] -> Op_G (opf a); - | J.Array [a; J.String "g"] -> Op_g (opf a); - | J.Array [a; b; c; J.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); - | J.Array [a; b; c; d; J.String "K"] -> Op_K (opf a, opf b, opf c, opf d); - | J.Array [J.String s; J.String "sh"] -> Op_sh s; - | J.Array [J.String s; J.String "MP"] -> Op_MP s; - | J.Array [J.String s; J.String "BMC"] -> Op_BMC s; - | J.Array [J.String s; J.String "Unknown"] -> O.Op_Unknown s - | J.Array [J.String s; obj; J.String "DP"] -> O.Op_DP (s, object_of_json obj) - | J.Array [a; J.String b; J.String "InlineImage"] -> + | `List [`String s; `String "Tj"] -> Op_Tj s + | `List [obj; `String "TJ"] -> Op_TJ (object_of_json obj) + | `List [`String s; `String "'"] -> Op_' s + | `List [a; b; `String s; `String "''"] -> Op_'' (opf a, opf b, s) + | `List [a; b; `String "d0"] -> Op_d0 (opf a, opf b) + | `List [a; b; c; d; e; f; `String "d1"] -> Op_d1 (opf a, opf b, opf c, opf d, opf e, opf f) + | `List [`String s; `String "cs"] -> Op_cs s + | `List [a; `String "G"] -> Op_G (opf a); + | `List [a; `String "g"] -> Op_g (opf a); + | `List [a; b; c; `String "RG"] -> Op_RG (opf a, opf b, opf c); + | `List [a; b; c; `String "rg"] -> Op_rg (opf a, opf b, opf c); + | `List [a; b; c; d; `String "K"] -> Op_K (opf a, opf b, opf c, opf d); + | `List [`String s; `String "sh"] -> Op_sh s; + | `List [`String s; `String "MP"] -> Op_MP s; + | `List [`String s; `String "BMC"] -> Op_BMC s; + | `List [`String s; `String "Unknown"] -> O.Op_Unknown s + | `List [`String s; obj; `String "DP"] -> O.Op_DP (s, object_of_json obj) + | `List [a; `String b; `String "InlineImage"] -> O.InlineImage (object_of_json a, Pdfio.bytes_of_string b) - | J.Array torev -> + | `List torev -> begin match rev torev with - | J.String "SCN"::ns -> O.Op_SCN (map opf (rev ns)) - | J.String "SC"::ns -> O.Op_SCN (map opf (rev ns)) - | J.String "sc"::ns -> O.Op_SCN (map opf (rev ns)) - | J.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)) - | J.String "scnName"::J.String s::ns -> O.Op_scnName (s, map opf (rev ns)) + | `String "SCN"::ns -> O.Op_SCN (map opf (rev ns)) + | `String "SC"::ns -> O.Op_SCN (map opf (rev ns)) + | `String "sc"::ns -> O.Op_SCN (map opf (rev ns)) + | `String "scn"::ns -> O.Op_SCN (map opf (rev ns)) + | `String "SCNName"::`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 -> - 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" end | j -> @@ -106,43 +108,40 @@ let rec op_of_json = function error "op reading failed" and object_of_json = function - | J.Null -> P.Null - | J.Bool b -> P.Boolean b - | J.Number n -> Pdf.Indirect (int_of_string n) - | J.String s -> P.String s - | J.Array objs -> P.Array (map object_of_json objs) - | J.Object ["I", J.Number i] -> P.Integer (int_of_string i) - | J.Object ["F", J.Number f] -> P.Real (float_of_string f) - | J.Object ["N", J.String n] -> P.Name n - | J.Object ["S", J.Array [dict; J.String data]] -> + | `Null -> P.Null + | `Bool b -> P.Boolean b + | `Int n -> Pdf.Indirect n + | `String s -> P.String s + | `List objs -> P.Array (map object_of_json objs) + | `Assoc ["I", `Int i] -> P.Integer i + | `Assoc ["F", `Float f] -> P.Real f + | `Assoc ["N", `String n] -> P.Name n + | `Assoc ["S", `List [dict; `String data]] -> (* Fix up the length, in case it's been edited. *) let d' = P.add_dict_entry (object_of_json dict) "/Length" (P.Integer (String.length data)) in 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) - | 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 = (*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 trailerdict = ref Pdf.Null in let objects = option_map (function - | J.Array [J.Number n; o] -> - let objnum = int_of_string n in - begin match objnum with - | -1 -> params := object_of_json o; None - | 0 -> trailerdict := object_of_json o; None - | n when n < 0 -> None - | n -> Some (n, object_of_json o) - end + | `List [`Int objnum; o] -> + begin match objnum with + | -1 -> params := object_of_json o; None + | 0 -> trailerdict := object_of_json o; None + | n when n < 0 -> None + | n -> Some (n, object_of_json o) + end | _ -> error "json bad obj") objs in @@ -183,19 +182,6 @@ let pdf_of_json json = P.was_linearized = false; 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 | P.Null -> `Null | P.Boolean b -> `Bool b @@ -344,12 +330,10 @@ let json_of_op pdf no_stream_data = function | O.Op_DP (s, obj) -> `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, * looking up the colourspace. We do not need to worry about inherited * resources, though? For now, don't worry about inherited resources: check in * PDF standard. *) - let parse_content_stream pdf resources bs = let ops = O.parse_stream pdf resources [bs] in `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 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. *) let of_input i = - (*pdf_of_json*) - (*ignore (J.parse (Pdfio.string_of_bytes (Pdfio.bytes_of_input i 0 (i.Pdfio.in_channel_length))));*) - example_pdf + let content = Pdfio.string_of_bytes (Pdfio.bytes_of_input i 0 (i.Pdfio.in_channel_length)) in + pdf_of_json (J.from_string content)