ovr_sdk

annotate LibOVR/Src/OVR_JSON.h @ 3:f12a8f74fe1f

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added the Xcode project
author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 21 Jan 2015 11:37:50 +0200
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nuclear@0 1 /************************************************************************************
nuclear@0 2
nuclear@0 3 PublicHeader: None
nuclear@0 4 Filename : OVR_JSON.h
nuclear@0 5 Content : JSON format reader and writer
nuclear@0 6 Created : April 9, 2013
nuclear@0 7 Author : Brant Lewis
nuclear@0 8 Notes :
nuclear@0 9
nuclear@0 10 Copyright : Copyright 2014 Oculus VR, LLC All Rights reserved.
nuclear@0 11
nuclear@0 12 Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License");
nuclear@0 13 you may not use the Oculus VR Rift SDK except in compliance with the License,
nuclear@0 14 which is provided at the time of installation or download, or which
nuclear@0 15 otherwise accompanies this software in either electronic or hard copy form.
nuclear@0 16
nuclear@0 17 You may obtain a copy of the License at
nuclear@0 18
nuclear@0 19 http://www.oculusvr.com/licenses/LICENSE-3.2
nuclear@0 20
nuclear@0 21 Unless required by applicable law or agreed to in writing, the Oculus VR SDK
nuclear@0 22 distributed under the License is distributed on an "AS IS" BASIS,
nuclear@0 23 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nuclear@0 24 See the License for the specific language governing permissions and
nuclear@0 25 limitations under the License.
nuclear@0 26
nuclear@0 27 ************************************************************************************/
nuclear@0 28
nuclear@0 29 #ifndef OVR_JSON_H
nuclear@0 30 #define OVR_JSON_H
nuclear@0 31
nuclear@0 32 #include "Kernel/OVR_RefCount.h"
nuclear@0 33 #include "Kernel/OVR_String.h"
nuclear@0 34 #include "Kernel/OVR_List.h"
nuclear@0 35
nuclear@0 36 namespace OVR {
nuclear@0 37
nuclear@0 38 // JSONItemType describes the type of JSON item, specifying the type of
nuclear@0 39 // data that can be obtained from it.
nuclear@0 40 enum JSONItemType
nuclear@0 41 {
nuclear@0 42 JSON_None = 0,
nuclear@0 43 JSON_Null = 1,
nuclear@0 44 JSON_Bool = 2,
nuclear@0 45 JSON_Number = 3,
nuclear@0 46 JSON_String = 4,
nuclear@0 47 JSON_Array = 5,
nuclear@0 48 JSON_Object = 6
nuclear@0 49 };
nuclear@0 50
nuclear@0 51 //-----------------------------------------------------------------------------
nuclear@0 52 // ***** JSON
nuclear@0 53
nuclear@0 54 // JSON object represents a JSON node that can be either a root of the JSON tree
nuclear@0 55 // or a child item. Every node has a type that describes what is is.
nuclear@0 56 // New JSON trees are typically loaded JSON::Load or created with JSON::Parse.
nuclear@0 57
nuclear@0 58 class JSON : public RefCountBase<JSON>, public ListNode<JSON>
nuclear@0 59 {
nuclear@0 60 protected:
nuclear@0 61 List<JSON> Children;
nuclear@0 62
nuclear@0 63 public:
nuclear@0 64 JSONItemType Type; // Type of this JSON node.
nuclear@0 65 String Name; // Name part of the {Name, Value} pair in a parent object.
nuclear@0 66 String Value;
nuclear@0 67 double dValue;
nuclear@0 68
nuclear@0 69 public:
nuclear@0 70 ~JSON();
nuclear@0 71
nuclear@0 72 // *** Creation of NEW JSON objects
nuclear@0 73
nuclear@0 74 static JSON* CreateObject() { return new JSON(JSON_Object);}
nuclear@0 75 static JSON* CreateNull() { return new JSON(JSON_Null); }
nuclear@0 76 static JSON* CreateArray() { return new JSON(JSON_Array); }
nuclear@0 77 static JSON* CreateBool(bool b);
nuclear@0 78 static JSON* CreateNumber(double num);
nuclear@0 79 static JSON* CreateInt(int num);
nuclear@0 80 static JSON* CreateString(const char *s);
nuclear@0 81
nuclear@0 82 // Creates a new JSON object from parsing string.
nuclear@0 83 // Returns null pointer and fills in *perror in case of parse error.
nuclear@0 84 static JSON* Parse(const char* buff, const char** perror = 0);
nuclear@0 85
nuclear@0 86 // This version works for buffers that are not null terminated strings.
nuclear@0 87 static JSON* ParseBuffer(const char *buff, int len, const char** perror = 0);
nuclear@0 88
nuclear@0 89 // Loads and parses a JSON object from a file.
nuclear@0 90 // Returns 0 and assigns perror with error message on fail.
nuclear@0 91 static JSON* Load(const char* path, const char** perror = 0);
nuclear@0 92
nuclear@0 93 // Saves a JSON object to a file.
nuclear@0 94 bool Save(const char* path);
nuclear@0 95
nuclear@0 96 // *** Object Member Access
nuclear@0 97
nuclear@0 98 // These provide access to child items of the list.
nuclear@0 99 bool HasItems() const { return Children.IsEmpty(); }
nuclear@0 100 // Returns first/last child item, or null if child list is empty
nuclear@0 101 JSON* GetFirstItem() { return (!Children.IsEmpty()) ? Children.GetFirst() : 0; }
nuclear@0 102 JSON* GetLastItem() { return (!Children.IsEmpty()) ? Children.GetLast() : 0; }
nuclear@0 103
nuclear@0 104 // Counts the number of items in the object; these methods are inefficient.
nuclear@0 105 unsigned GetItemCount() const;
nuclear@0 106 JSON* GetItemByIndex(unsigned i);
nuclear@0 107 JSON* GetItemByName(const char* name);
nuclear@0 108
nuclear@0 109 // Accessors by name
nuclear@0 110 double GetNumberByName(const char *name, double defValue = 0.0);
nuclear@0 111 int GetIntByName(const char *name, int defValue = 0);
nuclear@0 112 bool GetBoolByName(const char *name, bool defValue = false);
nuclear@0 113 String GetStringByName(const char *name, const String &defValue = "");
nuclear@0 114
nuclear@0 115 // Returns next item in a list of children; 0 if no more items exist.
nuclear@0 116 JSON* GetNextItem(JSON* item) { return Children.IsNull(item->pNext) ? 0 : item->pNext; }
nuclear@0 117 JSON* GetPrevItem(JSON* item) { return Children.IsNull(item->pPrev) ? 0 : item->pPrev; }
nuclear@0 118
nuclear@0 119
nuclear@0 120 // Child item access functions
nuclear@0 121 void AddItem(const char *string, JSON* item);
nuclear@0 122 void AddNullItem(const char* name) { AddItem(name, CreateNull()); }
nuclear@0 123 void AddBoolItem(const char* name, bool b) { AddItem(name, CreateBool(b)); }
nuclear@0 124 void AddIntItem(const char* name, int n) { AddItem(name, CreateInt(n)); }
nuclear@0 125 void AddNumberItem(const char* name, double n) { AddItem(name, CreateNumber(n)); }
nuclear@0 126 void AddStringItem(const char* name, const char* s) { AddItem(name, CreateString(s)); }
nuclear@0 127 // void ReplaceItem(unsigned index, JSON* new_item);
nuclear@0 128 // void DeleteItem(unsigned index);
nuclear@0 129 void RemoveLast();
nuclear@0 130
nuclear@0 131 // *** Array Element Access
nuclear@0 132
nuclear@0 133 // Add new elements to the end of array.
nuclear@0 134 void AddArrayElement(JSON *item);
nuclear@0 135 void InsertArrayElement(int index, JSON* item);
nuclear@0 136 void AddArrayNumber(double n) { AddArrayElement(CreateNumber(n)); }
nuclear@0 137 void AddArrayInt(int n) { AddArrayElement(CreateInt(n)); }
nuclear@0 138 void AddArrayString(const char* s) { AddArrayElement(CreateString(s)); }
nuclear@0 139
nuclear@0 140 // Accessed array elements; currently inefficient.
nuclear@0 141 int GetArraySize();
nuclear@0 142 double GetArrayNumber(int index);
nuclear@0 143 const char* GetArrayString(int index);
nuclear@0 144
nuclear@0 145 JSON* Copy(); // Create a copy of this object
nuclear@0 146
nuclear@0 147 protected:
nuclear@0 148 JSON(JSONItemType itemType = JSON_Object);
nuclear@0 149
nuclear@0 150 // JSON Parsing helper functions.
nuclear@0 151 const char* parseValue(const char *buff, const char** perror);
nuclear@0 152 const char* parseNumber(const char *num);
nuclear@0 153 const char* parseArray(const char* value, const char** perror);
nuclear@0 154 const char* parseObject(const char* value, const char** perror);
nuclear@0 155 const char* parseString(const char* str, const char** perror);
nuclear@0 156
nuclear@0 157 char* PrintValue(int depth, bool fmt);
nuclear@0 158 char* PrintObject(int depth, bool fmt);
nuclear@0 159 char* PrintArray(int depth, bool fmt);
nuclear@0 160 };
nuclear@0 161
nuclear@0 162
nuclear@0 163 }
nuclear@0 164
nuclear@0 165 #endif