/usr/include/ola/web/JsonLexer.h is in libola-dev 0.10.3.nojsmin-2+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* JsonLexer.h
* A class for Parsing Json data.
* See http://www.json.org/
* Copyright (C) 2014 Simon Newton
*/
/**
* @addtogroup json
* @{
* @file JsonLexer.h
* @brief The class used to parse JSON data.
*
* The implementation does it's best to conform to
* http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf
* @}
*/
#ifndef INCLUDE_OLA_WEB_JSONLEXER_H_
#define INCLUDE_OLA_WEB_JSONLEXER_H_
#include <ola/web/Json.h>
#include <string>
namespace ola {
namespace web {
/**
* @addtogroup json
* @{
*/
/**
* @brief Parse a string containing Json data.
*
* As the JsonLexer encounters each token in the document, it calls the
* appropriate method on the JsonParserInterface. It's not quite a pure lexer
* because it doesn't pass through tokens like ':' but you get the idea.
*/
class JsonLexer {
public:
/**
* @brief Parse a string containing JSON data.
* @param input the input string
* @param handler the JsonParserInterface to pass tokens to.
* @return true if parsing was successfull, false otherwise.
*/
static bool Parse(const std::string &input,
class JsonParserInterface *handler);
};
/**
* @brief The interface used to handle tokens during JSON parsing.
*
* As the JsonLexer traverses the input string, it calls the methods below.
*/
class JsonParserInterface {
public:
JsonParserInterface() {}
virtual ~JsonParserInterface() {}
/**
* @brief Called when parsing begins.
*/
virtual void Begin() = 0;
/**
* @brief Called when parsing completes.
*/
virtual void End() = 0;
/**
* @brief Called when a string is encounted.
*
* This is not called for object keys, see ObjectKey() below.
*/
virtual void String(const std::string &value) = 0;
/**
* @brief Called when a uint32_t is encounted.
*/
virtual void Number(uint32_t value) = 0;
/**
* @brief Called when a int32_t is encounted.
*/
virtual void Number(int32_t value) = 0;
/**
* @brief Called when a uint64_t is encounted.
*/
virtual void Number(uint64_t value) = 0;
/**
* @brief Called when a int64_t is encounted.
*/
virtual void Number(int64_t value) = 0;
/**
* @brief Called when a double value is encounted.
*
* MinGW struggles with long doubles
* http://mingw.5.n7.nabble.com/Strange-behaviour-of-gcc-4-8-1-with-long-double-td32949.html
* To avoid this, and to keep as many significant bits as possible we keep
* the components of a double separate. See JsonDouble for details.
*/
virtual void Number(const JsonDouble::DoubleRepresentation &rep) = 0;
/**
* @brief Called when a double value is encounted.
*/
virtual void Number(double d) = 0;
/**
* @brief Called when a bool is encounted.
*/
virtual void Bool(bool value) = 0;
/**
* @brief Called when a null token is encounted.
*/
virtual void Null() = 0;
/**
* @brief Called when an array starts.
*/
virtual void OpenArray() = 0;
/**
* @brief Called when an array completes.
*/
virtual void CloseArray() = 0;
/**
* @brief Called when an object starts.
*/
virtual void OpenObject() = 0;
/**
* @brief Called when a new key is encounted.
*
* This may be called multiple times for the same object. The standard
* doesn't specify how to handle duplicate keys, so I generally use the last
* one.
*/
virtual void ObjectKey(const std::string &key) = 0;
/**
* @brief Called when an object completes.
*/
virtual void CloseObject() = 0;
/**
* @brief Can be called at any time to indicate an error with the input data.
*/
virtual void SetError(const std::string &error) = 0;
};
/**@}*/
} // namespace web
} // namespace ola
#endif // INCLUDE_OLA_WEB_JSONLEXER_H_
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