SDK 0.2.3

1 files changed, 143 insertions, 0 deletions

diff --git a/LibOVR/Src/OVR_JSON.h b/LibOVR/Src/OVR_JSON.h
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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