JSONHandler.cc
3.73 KB
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#include <qpdf/JSONHandler.hh>
#include <qpdf/QPDFUsage.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
JSONHandler::JSONHandler() :
m(new Members())
{
}
void
JSONHandler::usage(std::string const& msg)
{
throw QPDFUsage(msg);
}
void
JSONHandler::addAnyHandler(json_handler_t fn)
{
m->h.any_handler = fn;
}
void
JSONHandler::addNullHandler(void_handler_t fn)
{
m->h.null_handler = fn;
}
void
JSONHandler::addStringHandler(string_handler_t fn)
{
m->h.string_handler = fn;
}
void
JSONHandler::addNumberHandler(string_handler_t fn)
{
m->h.number_handler = fn;
}
void
JSONHandler::addBoolHandler(bool_handler_t fn)
{
m->h.bool_handler = fn;
}
void
JSONHandler::addDictHandlers(json_handler_t start_fn, void_handler_t end_fn)
{
m->h.dict_start_handler = start_fn;
m->h.dict_end_handler = end_fn;
}
void
JSONHandler::addDictKeyHandler(std::string const& key, std::shared_ptr<JSONHandler> dkh)
{
m->h.dict_handlers[key] = dkh;
}
void
JSONHandler::addFallbackDictHandler(std::shared_ptr<JSONHandler> fdh)
{
m->h.fallback_dict_handler = fdh;
}
void
JSONHandler::addArrayHandlers(
json_handler_t start_fn, void_handler_t end_fn, std::shared_ptr<JSONHandler> ah)
{
m->h.array_start_handler = start_fn;
m->h.array_end_handler = end_fn;
m->h.array_item_handler = ah;
}
void
JSONHandler::handle(std::string const& path, JSON j)
{
if (m->h.any_handler) {
m->h.any_handler(path, j);
return;
}
bool handled = false;
bool bvalue = false;
std::string s_value;
if (m->h.null_handler && j.isNull()) {
m->h.null_handler(path);
handled = true;
}
if (m->h.string_handler && j.getString(s_value)) {
m->h.string_handler(path, s_value);
handled = true;
}
if (m->h.number_handler && j.getNumber(s_value)) {
m->h.number_handler(path, s_value);
handled = true;
}
if (m->h.bool_handler && j.getBool(bvalue)) {
m->h.bool_handler(path, bvalue);
handled = true;
}
if (m->h.dict_start_handler && j.isDictionary()) {
m->h.dict_start_handler(path, j);
std::string path_base = path;
if (path_base != ".") {
path_base += ".";
}
j.forEachDictItem([&path, &path_base, this](std::string const& k, JSON v) {
auto i = m->h.dict_handlers.find(k);
if (i == m->h.dict_handlers.end()) {
if (m->h.fallback_dict_handler.get()) {
m->h.fallback_dict_handler->handle(path_base + k, v);
} else {
QTC::TC("libtests", "JSONHandler unexpected key");
usage("JSON handler found unexpected key " + k + " in object at " + path);
}
} else {
i->second->handle(path_base + k, v);
}
});
m->h.dict_end_handler(path);
handled = true;
}
if (m->h.array_start_handler && j.isArray()) {
m->h.array_start_handler(path, j);
size_t i = 0;
j.forEachArrayItem([&i, &path, this](JSON v) {
m->h.array_item_handler->handle(path + "[" + std::to_string(i) + "]", v);
++i;
});
m->h.array_end_handler(path);
handled = true;
}
if (!handled) {
// It would be nice to include information about what type the
// object was and what types were allowed, but we're relying
// on schema validation to make sure input is properly
// structured before calling the handlers. It would be
// different if this code were trying to be part of a
// general-purpose JSON package.
QTC::TC("libtests", "JSONHandler unhandled value");
usage("JSON handler: value at " + path + " is not of expected type");
}
}