100 lines
1.9 KiB
C++
100 lines
1.9 KiB
C++
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/* parsers.hh
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* vim: set tw=80:
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* Eryn Wells <eryn@erynwells.me>
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*/
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/**
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* Some top-level YAML parser objects.
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*/
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#ifndef __YAML_PARSERS_HH__
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#define __YAML_PARSERS_HH__
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#include <functional>
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#include <stack>
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#include "yaml.h"
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#include "scene.h"
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namespace yaml {
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struct Parser;
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typedef std::stack<Parser*> ParserStack;
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/**
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* A Parser handles parsing a chunk of YAML, updating its mScene member as
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* necessary.
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*/
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struct Parser
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{
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/** Constructor */
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Parser(Scene& scene, ParserStack& parsers);
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/** Destructor */
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virtual ~Parser();
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/**
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* Called by the parser event loop to handle a libyaml parser event.
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*
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* @param [in] event A libyaml parser event object
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*/
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virtual void HandleEvent(yaml_event_t& event);
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/** Set the done flag. */
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void SetDone(bool done);
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/**
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* Returns true if the parser is done parsing.
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*
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* @returns `true` if done, `false` if not
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*/
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bool GetDone() const;
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protected:
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Scene& GetScene() const;
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ParserStack& GetParsers() const;
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private:
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/** The Scene being described by the YAML this parser is parsing. */
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Scene& mScene;
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/** The stack of parsers. */
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ParserStack& mParsers;
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/** `true` if the parser is done parsing */
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bool mDone;
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};
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/**
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* UtilityParsers handle small reusable bits of YAML and their constructors take
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* a C++11 lambda, which will be called back with the result of the parsed data.
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*/
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template<typename CallbackType>
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struct UtilityParser
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: public Parser
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{
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typedef std::function<CallbackType> CallbackFunction;
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UtilityParser(Scene& scene,
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ParserStack& parsers,
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CallbackFunction callback)
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: Parser(scene, parsers),
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mCallback(callback)
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{ }
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virtual
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~UtilityParser()
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{ }
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private:
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CallbackFunction mCallback;
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};
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} /* namespace yaml */
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#endif /* __YAML_PARSERS_HH__ */
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