mjson.h

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/********************************************************************\
 
  Name:         mjson.h
  Created by:   Konstantin Olchanski
 
  Contents:     JSON encoder and decoder
 
\********************************************************************/
 
#ifndef _MJSON_H_
#define _MJSON_H_
 
#include <string>
#include <vector>
 
/** @addtogroup mjson JSON Functions
 *  @{  */
 
#define MJSON_ERROR -1
#define MJSON_NONE   0
#define MJSON_ARRAY  1
#define MJSON_OBJECT 2
#define MJSON_STRING 3
#define MJSON_INT    4
#define MJSON_NUMBER 5
#define MJSON_BOOL   6
#define MJSON_NULL   7
#define MJSON_JSON   8
#define MJSON_ARRAYBUFFER 9
 
class MJsonNode;
 
typedef std::vector<std::string> MJsonStringVector;
typedef std::vector<MJsonNode*> MJsonNodeVector;
 
class MJsonNode {
 protected:
   int type;
   MJsonNodeVector   subnodes;
   MJsonStringVector object_names;
   std::string     string_value;
   long long       ll_value = 0;
   double          double_value = 0;
   size_t          arraybuffer_size = 0;
   char*           arraybuffer_ptr = NULL;
   
 public:
   ~MJsonNode(); // dtor
 
 public: // parser
   static MJsonNode* Parse(const char* jsonstring);
   
 public: // encoder
   std::string Stringify(int flags = 0) const;
 
 public: // string encoder
   static std::string Encode(const char* s);
   static std::string EncodeLL(long long v);
   static std::string EncodeDouble(double v);
   
 public: // public factory constructors
   static MJsonNode* MakeArray();
   static MJsonNode* MakeObject();
   static MJsonNode* MakeString(const char* value);
   static MJsonNode* MakeInt(long long value);
   static MJsonNode* MakeNumber(double value);
   static MJsonNode* MakeBool(bool value);
   static MJsonNode* MakeNull();
   static MJsonNode* MakeJSON(const char* json);
   static MJsonNode* MakeArrayBuffer(char* ptr, size_t size); /// the node takes ownership of the buffer
   static MJsonNode* MakeError(MJsonNode* errornode, const char* errormessage, const char* sin, const char* serror);
   
 public: // public "put" methods
   void AddToArray(MJsonNode* node); /// add node to an array. the array takes ownership of this node
   void AddToObject(const char* name, MJsonNode* node); /// add node to an object. the object takes ownership of this node
 
 public: // public "delete" methods
   void DeleteObjectNode(const char* name); /// delete a node from an object
 
 public: // public "get" methods
   int                    GetType() const;   /// get node type: MJSON_xxx
   const MJsonNodeVector* GetArray() const;  /// get array value, NULL if not array, empty array if value is JSON "null"
   const MJsonStringVector* GetObjectNames() const; /// get array of object names, NULL if not object, empty array if value is JSON "null"
   const MJsonNodeVector*   GetObjectNodes() const; /// get array of object subnodes, NULL if not object, empty array if value is JSON "null"
   const MJsonNode*       FindObjectNode(const char* name) const; /// find subnode with given name, NULL if not object, NULL is name not found
   std::string            GetString() const; /// get string value, "" if not string or value is JSON "null"
   long long              GetInt() const;    /// get integer value, 0 if not an integer or value is JSON "null"
   long long              GetLL() const;    /// get 64-bit long long value, 0 if not an integer or value is JSON "null"
   double                 GetDouble() const; /// get number or integer value, 0 if not a number or value is JSON "null"
   bool                   GetBool() const;   /// get boolean value, false if not a boolean or value is JSON "null"
   void                   GetArrayBuffer(const char** pptr, size_t* psize) const;
   std::string            GetError() const;  /// get error message from MJSON_ERROR nodes
 
 public: // public helper and debug methods
   static const char* TypeToString(int type); /// return node type as string
   void Dump(int nest = 0) const; /// dump the subtree to standard output
   MJsonNode* Copy() const; /// make a copy of the json tree
 
 protected:
   MJsonNode(int type); // protected constructor for subclassing
 
 private:
   //MJsonNode(); // constructor not permitted
   //MJsonNode(const MJsonNode&); // copy by copy-constructor not permitted, use Copy() method
   MJsonNode& operator=(const MJsonNode&); // copy by assignement not permitted, use Copy() method
};
 
#endif
 
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