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+/************************************************************************************
+
+PublicHeader: None
+Filename : OVR_JSON.h
+Content : JSON format reader and writer
+Created : April 9, 2013
+Author : Brant Lewis
+Notes :
+
+Copyright : Copyright 2012 Oculus VR, Inc. All Rights reserved.
+
+Use of this software is subject to the terms of the Oculus license
+agreement provided at the time of installation or download, or which
+otherwise accompanies this software in either electronic or hard copy form.
+
+************************************************************************************/
+
+#ifndef OVR_JSON_H
+#define OVR_JSON_H
+
+#include "Kernel/OVR_RefCount.h"
+#include "Kernel/OVR_String.h"
+#include "Kernel/OVR_List.h"
+
+namespace OVR {
+
+// JSONItemType describes the type of JSON item, specifying the type of
+// data that can be obtained from it.
+enum JSONItemType
+{
+ JSON_None = 0,
+ JSON_Null = 1,
+ JSON_Bool = 2,
+ JSON_Number = 3,
+ JSON_String = 4,
+ JSON_Array = 5,
+ JSON_Object = 6
+};
+
+
+//-----------------------------------------------------------------------------
+// ***** JSON
+
+// JSON object represents a JSON node that can be either a root of the JSON tree
+// or a child item. Every node has a type that describes what is is.
+// New JSON trees are typically loaded JSON::Load or created with JSON::Parse.
+
+class JSON : public RefCountBase<JSON>, public ListNode<JSON>
+{
+protected:
+ List<JSON> Children;
+
+public:
+ JSONItemType Type; // Type of this JSON node.
+ String Name; // Name part of the {Name, Value} pair in a parent object.
+ String Value;
+ double dValue;
+
+public:
+ ~JSON();
+
+ // *** Creation of NEW JSON objects
+
+ static JSON* CreateObject() { return new JSON(JSON_Object);}
+ static JSON* CreateNull() { return new JSON(JSON_Null); }
+ static JSON* CreateArray() { return new JSON(JSON_Array); }
+ static JSON* CreateBool(bool b) { return createHelper(JSON_Bool, b ? 1.0 : 0.0); }
+ static JSON* CreateNumber(double num) { return createHelper(JSON_Number, num); }
+ static JSON* CreateString(const char *s) { return createHelper(JSON_String, 0.0, s); }
+
+ // Creates a new JSON object from parsing string.
+ // Returns null pointer and fills in *perror in case of parse error.
+ static JSON* Parse(const char* buff, const char** perror = 0);
+
+ // Loads and parses a JSON object from a file.
+ // Returns 0 and assigns perror with error message on fail.
+ static JSON* Load(const char* path, const char** perror = 0);
+
+ // Saves a JSON object to a file.
+ bool Save(const char* path);
+
+
+ // *** Object Member Access
+
+ // These provide access to child items of the list.
+ bool HasItems() const { return Children.IsEmpty(); }
+ // Returns first/last child item, or null if child list is empty
+ JSON* GetFirstItem() { return (!Children.IsEmpty()) ? Children.GetFirst() : 0; }
+ JSON* GetLastItem() { return (!Children.IsEmpty()) ? Children.GetLast() : 0; }
+
+ // Counts the number of items in the object; these methods are inefficient.
+ unsigned GetItemCount() const;
+ JSON* GetItemByIndex(unsigned i);
+ JSON* GetItemByName(const char* name);
+
+ // Returns next item in a list of children; 0 if no more items exist.
+ JSON* GetNextItem(JSON* item) { return Children.IsNull(item->pNext) ? 0 : item->pNext; }
+ JSON* GetPrevItem(JSON* item) { return Children.IsNull(item->pPrev) ? 0 : item->pPrev; }
+
+
+ // Child item access functions
+ void AddItem(const char *string, JSON* item);
+ void AddNullItem(const char* name) { AddItem(name, CreateNull()); }
+ void AddBoolItem(const char* name, bool b) { AddItem(name, CreateBool(b)); }
+ void AddNumberItem(const char* name, double n) { AddItem(name, CreateNumber(n)); }
+ void AddStringItem(const char* name, const char* s) { AddItem(name, CreateString(s)); }
+// void ReplaceItem(unsigned index, JSON* new_item);
+// void DeleteItem(unsigned index);
+
+ // *** Array Element Access
+
+ // Add new elements to the end of array.
+ void AddArrayElement(JSON *item);
+ void AddArrayNumber(double n) { AddArrayElement(CreateNumber(n)); }
+ void AddArrayString(const char* s) { AddArrayElement(CreateString(s)); }
+
+ // Accessed array elements; currently inefficient.
+ int GetArraySize();
+ double GetArrayNumber(int index);
+ const char* GetArrayString(int index);
+
+
+protected:
+ JSON(JSONItemType itemType = JSON_Object);
+
+ static JSON* createHelper(JSONItemType itemType, double dval, const char* strVal = 0);
+
+ // JSON Parsing helper functions.
+ const char* parseValue(const char *buff, const char** perror);
+ const char* parseNumber(const char *num);
+ const char* parseArray(const char* value, const char** perror);
+ const char* parseObject(const char* value, const char** perror);
+ const char* parseString(const char* str, const char** perror);
+
+ char* PrintValue(int depth, bool fmt);
+ char* PrintObject(int depth, bool fmt);
+ char* PrintArray(int depth, bool fmt);
+};
+
+
+}
+
+#endif