Add optional version to --json

ChangeLog

@@ -1,3 +1,8 @@
+2022-01-31  Jay Berkenbilt  <ejb@ql.org>
+
+	* Allow optional version number or "latest" as parameter to
+	--json, allowing for future specification of json version.
+
 2022-01-28  Jay Berkenbilt  <ejb@ql.org>
 
 	* Add QPDFUsage exception, which is thrown by JSONHandler,

include/qpdf/QPDFJob.hh

@@ -595,7 +595,7 @@ class QPDFJob
         std::list<std::string> attachments_to_remove;
         std::list<AddAttachment> attachments_to_add;
         std::list<CopyAttachmentFrom> attachments_to_copy;
-        bool json;
+        int json_version;
         std::set<std::string> json_keys;
         std::set<std::string> json_objects;
         bool check;

include/qpdf/auto_job_c_main.hh

@@ -15,7 +15,6 @@ QPDF_DLL Config* flattenRotation();
 QPDF_DLL Config* generateAppearances();
 QPDF_DLL Config* ignoreXrefStreams();
 QPDF_DLL Config* isEncrypted();
-QPDF_DLL Config* json();
 QPDF_DLL Config* keepInlineImages();
 QPDF_DLL Config* linearize();
 QPDF_DLL Config* listAttachments();
@@ -76,3 +75,4 @@ QPDF_DLL Config* objectStreams(char const* parameter);
 QPDF_DLL Config* passwordMode(char const* parameter);
 QPDF_DLL Config* removeUnreferencedResources(char const* parameter);
 QPDF_DLL Config* streamData(char const* parameter);
+QPDF_DLL Config* json(char const* parameter);

job.sums

@@ -3,15 +3,15 @@ generate_auto_job ef1b438aeebed7ca0afcbe4d1f9c54d3acf899aec8410ebc69cd15ec673dd1
 include/qpdf/auto_job_c_att.hh 7ad43bb374c1370ef32ebdcdcb7b73a61d281f7f4e3f12755585872ab30fb60e
 include/qpdf/auto_job_c_copy_att.hh 32275d03cdc69b703dd7e02ba0bbe15756e714e9ad185484773a6178dc09e1ee
 include/qpdf/auto_job_c_enc.hh 72e138c7b96ed5aacdce78c1dec04b1c20d361faec4f8faf52f64c1d6be99265
-include/qpdf/auto_job_c_main.hh 516adb23cc7e44e614e436880be870d0574e4ebbc706cd855a1360000eed31bb
+include/qpdf/auto_job_c_main.hh ff776dd643279330fbf59770d1abf5aaeb13f20bfc5f6a25997aaa72a0907b44
 include/qpdf/auto_job_c_pages.hh 931840b329a36ca0e41401190e04537b47f2867671a6643bfd8da74014202671
 include/qpdf/auto_job_c_uo.hh 0585b7de459fa479d9e51a45fa92de0ff6dee748efc9ec1cedd0dde6cee1ad50
-job.yml 498459e6c2b7a9bc13168cd58fed75dbd24394fc187230ff7179a22288fa0de5
+job.yml c3e714b3c3e2fc85390d983302ff398aa0992c621e85dbcaee20173b1bd3cb0b
 libqpdf/qpdf/auto_job_decl.hh 9f79396ec459f191be4c5fe34cf88c265cf47355a1a945fa39169d1c94cf04f6
-libqpdf/qpdf/auto_job_help.hh 23c79f1d2c02bda28f64aace17f69487205c797e7ae2234892cbbabab49d6d47
-libqpdf/qpdf/auto_job_init.hh 8e9e31b6099a662497339b27f6e2d7f779f35011e88a834bee8811c33405a0fe
+libqpdf/qpdf/auto_job_help.hh a0ab6ab4dde2ad3d3f17ecae3ea274919119329e075061f3a3973535f5e367de
+libqpdf/qpdf/auto_job_init.hh c244e03e8b83ed7db732920f40aff0134e5f2e78a6edb9473ea4dd1934a8953e
 libqpdf/qpdf/auto_job_json_decl.hh 741a44106f7850b6cbc8af264b5b77bb605475c8d8dd8cd87011d5debbee6269
-libqpdf/qpdf/auto_job_json_init.hh 886dd8ed7ae7691eaa97a0e5b3f1445f4cccab88ed372f530a8524d198c8f1d9
+libqpdf/qpdf/auto_job_json_init.hh 63bbe1c3d673cd56196ec42ec7ede7b531563667d83564aa6680634fcb2cf259
 libqpdf/qpdf/auto_job_schema.hh a764050cc99f1cc95645fd1ea2f020c4b778957abc64fbc55c12eac3a369dc92
 manual/_ext/qpdf.py e9ac9d6c70642a3d29281ee5ad92ae2422dee8be9306fb8a0bc9dba0ed5e28f3
-manual/cli.rst 79140e023faa0cb77afe0b1dc512dd120ee5617f4db82f842596e4f239f93882
+manual/cli.rst a75a7e34aa9aba4f06e9c88cae9a2d9a2aa4e55a08521dde1478e8f2d80aadab

job.yml

@@ -29,6 +29,9 @@ choices:
     - all
     - print
     - screen
+  json_version:
+    - 1
+    - latest
   json_key:
     # The list of selectable top-level keys id duplicated in the
     # following places: job.yml, QPDFJob::json_schema, and
@@ -88,7 +91,6 @@ options:
       - generate-appearances
       - ignore-xref-streams
       - is-encrypted
-      - json
       - keep-inline-images
       - linearize
       - list-attachments
@@ -156,6 +158,8 @@ options:
       password-mode: password_mode
       remove-unreferenced-resources: remove_unref
       stream-data: stream_data
+    optional_choices:
+      json: json_version
   - table: pages
     config: c_pages
     prefix: Pages

libqpdf/QPDFJob.cc

@@ -420,7 +420,7 @@ QPDFJob::Members::Members() :
     collate(0),
     flatten_rotation(false),
     list_attachments(false),
-    json(false),
+    json_version(0),
     check(false),
     optimize_images(false),
     externalize_inline_images(false),
@@ -1924,7 +1924,7 @@ QPDFJob::doInspection(QPDF& pdf)
     {
         doCheck(pdf);
     }
-    if (m->json)
+    if (m->json_version)
     {
         doJSON(pdf);
     }

libqpdf/QPDFJob_config.cc

@@ -235,9 +235,27 @@ QPDFJob::Config::isEncrypted()
 }
 
 QPDFJob::Config*
-QPDFJob::Config::json()
+QPDFJob::Config::json(char const* parameter)
 {
-    o.m->json = true;
+    if (parameter)
+    {
+        if (strcmp(parameter, "latest") == 0)
+        {
+            o.m->json_version = 1;
+        }
+        else
+        {
+            o.m->json_version = QUtil::string_to_int(parameter);
+        }
+    }
+    else
+    {
+        o.m->json_version = 1;
+    }
+    if (o.m->json_version != 1)
+    {
+        usage(std::string("unsupported json version ") + parameter);
+    }
     o.m->require_outfile = false;
     return this;
 }

libqpdf/qpdf/auto_job_help.hh

@@ -788,8 +788,11 @@ output as binary data. Get the key with --list-attachments.
 ap.addHelpTopic("json", "JSON output for PDF information", R"(Show information about the PDF file in JSON format. Please see the
 JSON chapter in the qpdf manual for details.
 )");
-ap.addOptionHelp("--json", "json", "show file in json format", R"(Generate a JSON representation of the file. This is described in
-depth in the JSON section of the manual.
+ap.addOptionHelp("--json", "json", "show file in json format", R"(--json[=version]
+
+Generate a JSON representation of the file. This is described in
+depth in the JSON section of the manual. "version" may be a
+specific version or "latest".
 )");
 ap.addOptionHelp("--json-help", "json", "show format of json output", R"(Describe the format of the JSON output.
 )");

libqpdf/qpdf/auto_job_init.hh

@@ -17,6 +17,7 @@ static char const* decode_level_choices[] = {"none", "generalized", "specialized
 static char const* object_streams_choices[] = {"disable", "preserve", "generate", 0};
 static char const* remove_unref_choices[] = {"auto", "yes", "no", 0};
 static char const* flatten_choices[] = {"all", "print", "screen", 0};
+static char const* json_version_choices[] = {"1", "latest", 0};
 static char const* json_key_choices[] = {"acroform", "attachments", "encrypt", "objectinfo", "objects", "outlines", "pagelabels", "pages", 0};
 static char const* print128_choices[] = {"full", "low", "none", 0};
 static char const* modify128_choices[] = {"all", "annotate", "form", "assembly", "none", 0};
@@ -45,7 +46,6 @@ this->ap.addBare("flatten-rotation", [this](){c_main->flattenRotation();});
 this->ap.addBare("generate-appearances", [this](){c_main->generateAppearances();});
 this->ap.addBare("ignore-xref-streams", [this](){c_main->ignoreXrefStreams();});
 this->ap.addBare("is-encrypted", [this](){c_main->isEncrypted();});
-this->ap.addBare("json", [this](){c_main->json();});
 this->ap.addBare("keep-inline-images", [this](){c_main->keepInlineImages();});
 this->ap.addBare("linearize", [this](){c_main->linearize();});
 this->ap.addBare("list-attachments", [this](){c_main->listAttachments();});
@@ -110,6 +110,7 @@ this->ap.addChoices("object-streams", [this](char *x){c_main->objectStreams(x);}
 this->ap.addChoices("password-mode", [this](char *x){c_main->passwordMode(x);}, true, password_mode_choices);
 this->ap.addChoices("remove-unreferenced-resources", [this](char *x){c_main->removeUnreferencedResources(x);}, true, remove_unref_choices);
 this->ap.addChoices("stream-data", [this](char *x){c_main->streamData(x);}, true, stream_data_choices);
+this->ap.addChoices("json", [this](char *x){c_main->json(x);}, false, json_version_choices);
 this->ap.registerOptionTable("pages", b(&ArgParser::argEndPages));
 this->ap.addPositional(p(&ArgParser::argPagesPositional));
 this->ap.addRequiredParameter("password", p(&ArgParser::argPagesPassword), "password");

libqpdf/qpdf/auto_job_json_init.hh

@@ -10,6 +10,7 @@ static char const* decode_level_choices[] = {"none", "generalized", "specialized
 static char const* object_streams_choices[] = {"disable", "preserve", "generate", 0};
 static char const* remove_unref_choices[] = {"auto", "yes", "no", 0};
 static char const* flatten_choices[] = {"all", "print", "screen", 0};
+static char const* json_version_choices[] = {"1", "latest", 0};
 static char const* json_key_choices[] = {"acroform", "attachments", "encrypt", "objectinfo", "objects", "outlines", "pagelabels", "pages", 0};
 static char const* print128_choices[] = {"full", "low", "none", 0};
 static char const* modify128_choices[] = {"all", "annotate", "form", "assembly", "none", 0};
@@ -248,7 +249,7 @@ pushKey("showAttachment");
 addParameter([this](char const* p) { c_main->showAttachment(p); });
 popHandler(); // key: showAttachment
 pushKey("json");
-addBare([this]() { c_main->json(); });
+addChoices(json_version_choices, [this](char const* p) { c_main->json(p); });
 popHandler(); // key: json
 pushKey("jsonKey");
 beginArray(bindJSON(&Handlers::beginInspectJsonKeyArray), bindBare(&Handlers::endInspectJsonKeyArray)); // .inspect.jsonKey[]

manual/cli.rst

@@ -3136,15 +3136,21 @@ See :ref:`json` for details about the qpdf JSON format.
 Related Options
 ~~~~~~~~~~~~~~~
 
-.. qpdf:option:: --json
+.. qpdf:option:: --json[=version]
 
    .. help: show file in json format
 
       Generate a JSON representation of the file. This is described in
-      depth in the JSON section of the manual.
+      depth in the JSON section of the manual. "version" may be a
+      specific version or "latest".
 
    Generate a JSON representation of the file. This is described in
-   depth in :ref:`json`.
+   depth in :ref:`json`. The version parameter can be used to specify
+   which json version should be output. The only supported value is
+   ``1``, but it's possible that a new json output version will be
+   added in a future version. You can also specify ``latest`` to use
+   the latest json version. For backward compatibility, the default
+   value is ``1``.
 
 .. qpdf:option:: --json-help
 

qpdf/qtest/qpdf.test

@@ -617,7 +617,7 @@ $td->runtest("list attachments verbose",
 	     {$td->FILE => "test76-list-verbose.out", $td->EXIT_STATUS => 0},
 	     $td->NORMALIZE_NEWLINES);
 $td->runtest("attachments json",
-	     {$td->COMMAND => "qpdf --json --json-key=attachments a.pdf"},
+	     {$td->COMMAND => "qpdf --json=1 --json-key=attachments a.pdf"},
 	     {$td->FILE => "test76-json.out", $td->EXIT_STATUS => 0},
 	     $td->NORMALIZE_NEWLINES);
 $td->runtest("remove attachment (test_driver)",
@@ -2705,7 +2705,7 @@ $td->runtest("show direct pages",
 foreach my $f (qw(page_api_2 direct-pages))
 {
     $td->runtest("json for $f",
-                 {$td->COMMAND => "qpdf --json $f.pdf"},
+                 {$td->COMMAND => "qpdf --json=latest $f.pdf"},
                  {$td->FILE => "$f-json.out", $td->EXIT_STATUS => 0},
                  $td->NORMALIZE_NEWLINES);
 }