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#ifndef PARSER_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#define PARSER_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#if defined(_MSC_VER) || \
(defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || \
(__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif
#include <ios>
#include <memory>
#include "yaml-cpp/dll.h"
namespace YAML {
class EventHandler;
class Node;
class Scanner;
struct Directives;
struct Token;
/**
* A parser turns a stream of bytes into one stream of "events" per YAML
* document in the input stream.
*/
class YAML_CPP_API Parser {
public:
/** Constructs an empty parser (with no input. */
Parser();
Parser(const Parser&) = delete;
Parser(Parser&&) = delete;
Parser& operator=(const Parser&) = delete;
Parser& operator=(Parser&&) = delete;
/**
* Constructs a parser from the given input stream. The input stream must
* live as long as the parser.
*/
explicit Parser(std::istream& in);
~Parser();
/** Evaluates to true if the parser has some valid input to be read. */
explicit operator bool() const;
/**
* Resets the parser with the given input stream. Any existing state is
* erased.
*/
void Load(std::istream& in);
/**
* Handles the next document by calling events on the {@code eventHandler}.
*
* @throw a ParserException on error.
* @return false if there are no more documents
*/
bool HandleNextDocument(EventHandler& eventHandler);
void PrintTokens(std::ostream& out);
private:
/**
* Reads any directives that are next in the queue, setting the internal
* {@code m_pDirectives} state.
*/
void ParseDirectives();
void HandleDirective(const Token& token);
/**
* Handles a "YAML" directive, which should be of the form 'major.minor' (like
* a version number).
*/
void HandleYamlDirective(const Token& token);
/**
* Handles a "TAG" directive, which should be of the form 'handle prefix',
* where 'handle' is converted to 'prefix' in the file.
*/
void HandleTagDirective(const Token& token);
private:
std::unique_ptr<Scanner> m_pScanner;
std::unique_ptr<Directives> m_pDirectives;
};
} // namespace YAML
#endif // PARSER_H_62B23520_7C8E_11DE_8A39_0800200C9A66
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