mirror of
https://github.com/qpdf/qpdf.git
synced 2024-09-28 21:19:06 +00:00
81 lines
3.1 KiB
C++
81 lines
3.1 KiB
C++
#ifndef JSONHANDLER_HH
|
|
#define JSONHANDLER_HH
|
|
|
|
#include <qpdf/JSON.hh>
|
|
#include <functional>
|
|
#include <map>
|
|
#include <memory>
|
|
#include <string>
|
|
|
|
// This class allows a sax-like walk through a JSON object with functionality that mostly mirrors
|
|
// QPDFArgParser. It is primarily here to facilitate automatic generation of some of the code to
|
|
// help keep QPDFJob json consistent with command-line arguments.
|
|
|
|
class JSONHandler
|
|
{
|
|
public:
|
|
// A QPDFUsage exception is thrown if there are any errors validating the JSON object.
|
|
JSONHandler();
|
|
~JSONHandler();
|
|
|
|
// Based on the type of handler, expect the object to be of a certain type. QPDFUsage is thrown
|
|
// otherwise. Multiple handlers may be registered, which allows the object to be of various
|
|
// types. If an anyHandler is added, no other handler will be called. There is no "final"
|
|
// handler -- if the top-level is a dictionary or array, just use its end handler.
|
|
|
|
typedef std::function<void(std::string const& path, JSON value)> json_handler_t;
|
|
typedef std::function<void(std::string const& path)> void_handler_t;
|
|
typedef std::function<void(std::string const& path, std::string const& value)> string_handler_t;
|
|
typedef std::function<void(std::string const& path, bool value)> bool_handler_t;
|
|
|
|
// If an any handler is added, it will be called for any value including null, and no other
|
|
// handler will be called.
|
|
void addAnyHandler(json_handler_t fn);
|
|
|
|
// If any of the remaining handlers are registered, each registered handle will be called.
|
|
void addNullHandler(void_handler_t fn);
|
|
void addStringHandler(string_handler_t fn);
|
|
void addNumberHandler(string_handler_t fn);
|
|
void addBoolHandler(bool_handler_t fn);
|
|
|
|
void addDictHandlers(json_handler_t start_fn, void_handler_t end_fn);
|
|
void addDictKeyHandler(std::string const& key, std::shared_ptr<JSONHandler>);
|
|
void addFallbackDictHandler(std::shared_ptr<JSONHandler>);
|
|
|
|
void addArrayHandlers(
|
|
json_handler_t start_fn, void_handler_t end_fn, std::shared_ptr<JSONHandler> item_handlers);
|
|
|
|
// Apply handlers recursively to a JSON object.
|
|
void handle(std::string const& path, JSON j);
|
|
|
|
private:
|
|
JSONHandler(JSONHandler const&) = delete;
|
|
|
|
static void usage(std::string const& msg);
|
|
|
|
struct Handlers
|
|
{
|
|
Handlers() = default;
|
|
|
|
json_handler_t any_handler{nullptr};
|
|
void_handler_t null_handler{nullptr};
|
|
string_handler_t string_handler{nullptr};
|
|
string_handler_t number_handler{nullptr};
|
|
bool_handler_t bool_handler{nullptr};
|
|
json_handler_t dict_start_handler{nullptr};
|
|
void_handler_t dict_end_handler{nullptr};
|
|
json_handler_t array_start_handler{nullptr};
|
|
void_handler_t array_end_handler{nullptr};
|
|
void_handler_t final_handler{nullptr};
|
|
std::map<std::string, std::shared_ptr<JSONHandler>> dict_handlers;
|
|
std::shared_ptr<JSONHandler> fallback_dict_handler;
|
|
std::shared_ptr<JSONHandler> array_item_handler;
|
|
};
|
|
|
|
class Members;
|
|
|
|
std::unique_ptr<Members> m;
|
|
};
|
|
|
|
#endif // JSONHANDLER_HH
|