prototype versions of ReplaceObject.

Based on an idea from Daniel Harcek; these are designed to allow you to replace entries in an object or array with new
values. The old values get deleted and the new ones are wired into place.

This leads to a structure like this:
cJSON_ReplaceItemInObject(myobject, "spooncount", cJSON_CreateNumber(24));

cJSON +NEVER+ type checks, so it's perfectly legal to replace an object with a string (to cJSON) though it may not be in your schema!



git-svn-id: http://svn.code.sf.net/p/cjson/code@13 e3330c51-1366-4df0-8b21-3ccf24e3d50e

cJSON.c

@@ -450,6 +450,12 @@ static void suffix_object(cJSON *prev,cJSON *item) {prev->next=item;item->prev=p
 void   cJSON_AddItemToArray(cJSON *array, cJSON *item)						{cJSON *c=array->child;if (!c) {array->child=item;} else {while (c && c->next) c=c->next; suffix_object(c,item);}}
 void   cJSON_AddItemToObject(cJSON *object,const char *string,cJSON *item)	{if (item->string) cJSON_free(item->string);item->string=cJSON_strdup(string);cJSON_AddItemToArray(object,item);}
 
+// Replace array/object items with new ones.
+void   cJSON_ReplaceItemInArray(cJSON *array,int which,cJSON *newitem)		{cJSON *c=array->child;while (c && which>0) c=c->next,which--;if (!c) return;
+	newitem->next=c->next;newitem->prev=c->prev;if (newitem->next) newitem->next->prev=newitem;
+	if (c==array->child) array->child=newitem; else newitem->prev->next=newitem;cJSON_Delete(c);}
+void   cJSON_ReplaceItemInObject(cJSON *object,const char *string,cJSON *newitem){int i=0;cJSON *c=object->child;while(c && strcasecmp(c->string,string))i++,c=c->next;if(c)cJSON_ReplaceItemInArray(object,i,newitem);}
+
 // Create basic types:
 cJSON *cJSON_CreateNull()						{cJSON *item=cJSON_New_Item();item->type=cJSON_NULL;return item;}
 cJSON *cJSON_CreateTrue()						{cJSON *item=cJSON_New_Item();item->type=cJSON_True;return item;}

cJSON.h

@@ -73,7 +73,7 @@ extern int	  cJSON_GetArraySize(cJSON *array);
 extern cJSON *cJSON_GetArrayItem(cJSON *array,int item);
 // Get item "string" from object. Case insensitive.
 extern cJSON *cJSON_GetObjectItem(cJSON *object,const char *string);
-
+	
 // These calls create a cJSON item of the appropriate type.
 extern cJSON *cJSON_CreateNull();
 extern cJSON *cJSON_CreateTrue();
@@ -90,8 +90,12 @@ extern cJSON *cJSON_CreateDoubleArray(double *numbers,int count);
 extern cJSON *cJSON_CreateStringArray(const char **strings,int count);
 
 // Append item to the specified array/object.
-extern void   cJSON_AddItemToArray(cJSON *array, cJSON *item);
-extern void	  cJSON_AddItemToObject(cJSON *object,const char *string,cJSON *item);
+extern void cJSON_AddItemToArray(cJSON *array, cJSON *item);
+extern void	cJSON_AddItemToObject(cJSON *object,const char *string,cJSON *item);
+
+// Update array items.
+extern void cJSON_ReplaceItemInArray(cJSON *array,int which,cJSON *newitem);
+extern void cJSON_ReplaceItemInObject(cJSON *object,const char *string,cJSON *newitem);
 
 #define cJSON_AddNullToObject(object,name)	cJSON_AddItemToObject(object, name, cJSON_CreateNull())
 #define cJSON_AddTrueToObject(object,name)	cJSON_AddItemToObject(object, name, cJSON_CreateTrue())