json_handler.cc
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#include <qpdf/JSONHandler.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/QPDFUsage.hh>
#include <iostream>
#include <cassert>
static void print_null(std::string const& path)
{
std::cout << path << ": null" << std::endl;
}
static void print_string(std::string const& path, std::string const& value)
{
std::cout << path << ": string: " << value << std::endl;
}
static void print_number(std::string const& path, std::string const& value)
{
std::cout << path << ": number: " << value << std::endl;
}
static void print_bool(std::string const& path, bool value)
{
std::cout << path << ": bool: " << (value ? "true" : "false") << std::endl;
}
static void print_json(std::string const& path, JSON value)
{
std::cout << path << ": json: " << value.unparse() << std::endl;
}
static JSONHandler::void_handler_t make_print_message(std::string msg)
{
return [msg](std::string const& path) {
std::cout << path << ": json: " << msg << std::endl;
};
}
static void test_scalar()
{
std::cout << "-- scalar --" << std::endl;
JSONHandler h;
h.addStringHandler(print_string);
JSON j = JSON::parse("\"potato\"");
h.handle(".", j);
}
static std::shared_ptr<JSONHandler> make_all_handler()
{
auto h = std::make_shared<JSONHandler>();
h->addDictHandlers(
print_json, make_print_message("dict end"));
auto h1 = std::make_shared<JSONHandler>();
h1->addStringHandler(print_string);
h->addDictKeyHandler("one", h1);
auto h2 = std::make_shared<JSONHandler>();
h2->addNumberHandler(print_number);
h->addDictKeyHandler("two", h2);
auto h3 = std::make_shared<JSONHandler>();
h3->addBoolHandler(print_bool);
h->addDictKeyHandler("three", h3);
auto h4 = std::make_shared<JSONHandler>();
h4->addAnyHandler(print_json);
h->addDictKeyHandler("four", h4);
h->addDictKeyHandler("phour", h4); // share h4
auto h5 = std::make_shared<JSONHandler>();
// Allow to be either string or bool
h5->addBoolHandler(print_bool);
h5->addStringHandler(print_string);
h5->addNullHandler(print_null);
auto h5s = std::make_shared<JSONHandler>();
h->addDictKeyHandler("five", h5s);
h5s->addArrayHandlers(
make_print_message("array begin"),
make_print_message("array end"),
h5);
auto h6 = std::make_shared<JSONHandler>();
h6->addDictHandlers(
print_json, make_print_message("dict end"));
auto h6a = std::make_shared<JSONHandler>();
h6->addDictKeyHandler("a", h6a);
h6a->addDictHandlers(
print_json, make_print_message("dict end"));
auto h6ab = std::make_shared<JSONHandler>();
h6a->addDictKeyHandler("b", h6ab);
auto h6ax = std::make_shared<JSONHandler>();
h6ax->addAnyHandler(print_json);
h6a->addFallbackDictHandler(h6ax);
h6->addDictKeyHandler("b", h6ab); // share
h6ab->addStringHandler(print_string);
h->addDictKeyHandler("six", h6);
return h;
}
static void test_all()
{
std::cout << "-- all --" << std::endl;
auto h = make_all_handler();
/* cSpell: ignore phour */
JSON j = JSON::parse(R"({
"one": "potato",
"two": 3.14,
"three": true,
"four": ["a", 1],
"five": ["x", false, "y", null, true],
"phour": null,
"six": {"a": {"b": "quack", "Q": "baaa"}, "b": "moo"}
})");
h->handle(".", j);
}
static void test_errors()
{
std::cout << "-- errors --" << std::endl;
auto h = make_all_handler();
auto t = [h](std::string const& msg, std::function<void()> fn) {
try
{
fn();
assert(false);
}
catch (QPDFUsage& e)
{
std::cout << msg << ": " << e.what() << std::endl;
}
};
t("bad type at top", [&h](){
h->handle(".", JSON::makeString("oops"));
});
t("unexpected key", [&h](){
JSON j = JSON::parse(R"({"x": "y"})");
h->handle(".", j);
});
}
int main(int argc, char* argv[])
{
test_scalar();
test_all();
test_errors();
return 0;
}