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