QPDFJob_json.cc
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#include <qpdf/QPDFJob.hh>
#include <qpdf/JSONHandler.hh>
#include <qpdf/QPDFUsage.hh>
#include <memory>
#include <stdexcept>
#include <sstream>
#include <cstring>
static JSON JOB_SCHEMA = JSON::parse(QPDFJob::json_job_schema_v1().c_str());
namespace
{
class Handlers
{
public:
Handlers(std::shared_ptr<QPDFJob::Config> c_main);
void handle(JSON&);
private:
# include <qpdf/auto_job_json_decl.hh>
void usage(std::string const& message);
void initHandlers();
typedef std::function<void()> bare_arg_handler_t;
typedef std::function<void(char const*)> param_arg_handler_t;
void addBare(std::string const& key, bare_arg_handler_t);
void addParameter(std::string const& key, bool required,
param_arg_handler_t);
void addChoices(std::string const& key,
bool required, char const** choices,
param_arg_handler_t);
void beginDict(std::string const& key,
bare_arg_handler_t start_fn,
bare_arg_handler_t end_fn);
void endDict();
std::list<std::shared_ptr<JSONHandler>> json_handlers;
JSONHandler* jh; // points to last of json_handlers
std::shared_ptr<QPDFJob::Config> c_main;
std::shared_ptr<QPDFJob::CopyAttConfig> c_copy_att;
std::shared_ptr<QPDFJob::AttConfig> c_att;
std::shared_ptr<QPDFJob::PagesConfig> c_pages;
std::shared_ptr<QPDFJob::UOConfig> c_uo;
std::shared_ptr<QPDFJob::EncConfig> c_enc;
};
}
Handlers::Handlers(std::shared_ptr<QPDFJob::Config> c_main) :
jh(nullptr),
c_main(c_main)
{
initHandlers();
}
void
Handlers::usage(std::string const& message)
{
throw QPDFUsage(message);
}
void
Handlers::initHandlers()
{
this->json_handlers.push_back(std::make_shared<JSONHandler>());
this->jh = this->json_handlers.back().get();
jh->addDictHandlers(
[](std::string const&){},
[this](std::string const&){c_main->checkConfiguration();});
# include <qpdf/auto_job_json_init.hh>
// QXXXQ
auto empty = [](){};
beginDict("input", empty, empty);
beginDict("file", empty, empty);
addParameter("name", true, [this](char const* p) {
c_main->inputFile(p);
});
endDict(); // input.file
endDict(); // input
beginDict("output", empty, empty);
beginDict("file", empty, empty);
addParameter("name", true, [this](char const* p) {
c_main->outputFile(p);
});
endDict(); // output.file
beginDict("options", empty, empty);
addBare("qdf", [this]() {
c_main->qdf();
});
char const* choices[] = {"disable", "preserve", "generate", 0};
addChoices("objectStreams", true, choices, [this](char const* p) {
c_main->objectStreams(p);
});
endDict(); // output.options
endDict(); // output
// /QXXXQ
if (this->json_handlers.size() != 1)
{
throw std::logic_error("QPDFJob_json: json_handlers size != 1 at end");
}
}
void
Handlers::addBare(std::string const& key, bare_arg_handler_t fn)
{
auto h = std::make_shared<JSONHandler>();
h->addBoolHandler([this, fn](std::string const& path, bool v){
if (! v)
{
usage(path + ": value must be true");
}
else
{
fn();
}
});
jh->addDictKeyHandler(key, h);
}
void
Handlers::addParameter(std::string const& key,
bool required,
param_arg_handler_t fn)
{
auto h = std::make_shared<JSONHandler>();
h->addStringHandler(
[fn](std::string const& path, std::string const& parameter){
fn(parameter.c_str());
});
if (! required)
{
h->addNullHandler(
[fn](std::string const& path){
fn(nullptr);
});
}
jh->addDictKeyHandler(key, h);
}
void
Handlers::addChoices(std::string const& key,
bool required, char const** choices,
param_arg_handler_t fn)
{
auto h = std::make_shared<JSONHandler>();
h->addStringHandler(
[fn, choices, this](
std::string const& path, std::string const& parameter){
char const* p = parameter.c_str();
bool matches = false;
for (char const** i = choices; *i; ++i)
{
if (strcmp(*i, p) == 0)
{
matches = true;
break;
}
}
if (! matches)
{
std::ostringstream msg;
msg << path + ": unexpected value; expected one of ";
bool first = true;
for (char const** i = choices; *i; ++i)
{
if (first)
{
first = false;
}
else
{
msg << ", ";
}
msg << *i;
}
usage(msg.str());
}
fn(parameter.c_str());
});
if (! required)
{
h->addNullHandler(
[fn](std::string const& path){
fn(nullptr);
});
}
jh->addDictKeyHandler(key, h);
}
void
Handlers::beginDict(std::string const& key,
bare_arg_handler_t start_fn,
bare_arg_handler_t end_fn)
{
auto new_jh = std::make_shared<JSONHandler>();
new_jh->addDictHandlers(
[start_fn](std::string const&){ start_fn(); },
[end_fn](std::string const&){ end_fn(); });
this->jh->addDictKeyHandler(key, new_jh);
this->json_handlers.push_back(new_jh);
this->jh = new_jh.get();
}
void
Handlers::endDict()
{
this->json_handlers.pop_back();
this->jh = this->json_handlers.back().get();
}
void
Handlers::handle(JSON& j)
{
this->json_handlers.back()->handle(".", j);
}
void
QPDFJob::initializeFromJson(std::string const& json)
{
std::list<std::string> errors;
JSON j = JSON::parse(json);
if (! j.checkSchema(JOB_SCHEMA, JSON::f_optional, errors))
{
std::ostringstream msg;
msg << this->m->message_prefix
<< ": job json has errors:";
for (auto const& error: errors)
{
msg << std::endl << " " << error;
}
throw std::runtime_error(msg.str());
}
Handlers(config()).handle(j);
}