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start of JSON Patch implementation. cJSON gained a cJSON_InsertItemToArray which pushes elements up by one.

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This is needed for JSON Patch. Everything but Test is implemented for ApplyPatches.


git-svn-id: svn://svn.code.sf.net/p/cjson/code@65 e3330c51-1366-4df0-8b21-3ccf24e3d50e
This commit is contained in:
Dave Gamble
2015-02-10 14:17:59 +00:00
parent 858671cc7f
commit 3c6b3cc617
5 changed files with 158 additions and 3 deletions
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107
cJSON_Utils.c
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@ -1,6 +1,9 @@
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include "cJSON_Utils.h"
// JSON Pointer implementation:
static int cJSONUtils_Pstrcasecmp(const char *a,const char *e)
{
if (!a || !e) return (a==e)?0:1;
@ -12,7 +15,6 @@ static int cJSONUtils_Pstrcasecmp(const char *a,const char *e)
return 0;
}
cJSON *cJSONUtils_GetPointer(cJSON *object,const char *pointer)
{
cJSON *target=object;int which=0;const char *element=0;
@ -36,4 +38,107 @@ cJSON *cJSONUtils_GetPointer(cJSON *object,const char *pointer)
return object;
}
// JSON Patch implementation.
static void cJSONUtils_InplaceDecodePointerString(char *string)
{
char *s2=string;
for (;*string;s2++,string++)
*s2=(*string!='~')?(*string):((*(++string)=='0')?'~':'/');
*s2=0;
}
static cJSON *cJSONUtils_PatchDetach(cJSON *object,const char *path)
{
char *parentptr=0,*childptr=0;cJSON *parent=0;
parentptr=strdup(path); childptr=strrchr(parentptr,'/'); if (childptr) *childptr++=0;
parent=cJSONUtils_GetPointer(object,parentptr);
cJSONUtils_InplaceDecodePointerString(childptr);
cJSON *ret=0;
if (!parent) ret=0; // Couldn't find object to remove child from.
else if (parent->type==cJSON_Array) ret=cJSON_DetachItemFromArray(parent,atoi(childptr));
else if (parent->type==cJSON_Object) ret=cJSON_DetachItemFromObject(parent,childptr);
free(parentptr);
return ret;
}
static int cJSONUtils_ApplyPatch(cJSON *object,cJSON *patch)
{
cJSON *op=0,*path=0,*value=0;int opcode=0;
op=cJSON_GetObjectItem(patch,"op");
path=cJSON_GetObjectItem(patch,"path");
if (!op || !path) return 2; // malformed patch.
if (!strcmp(op->valuestring,"add")) opcode=0;
else if (!strcmp(op->valuestring,"remove")) opcode=1;
else if (!strcmp(op->valuestring,"replace"))opcode=2;
else if (!strcmp(op->valuestring,"move")) opcode=3;
else if (!strcmp(op->valuestring,"copy")) opcode=4;
else if (!strcmp(op->valuestring,"test")) opcode=5;
else return 3; // unknown opcode.
if (opcode==5) return 10; // TEST IS CURRENTLY UNIMPLEMENTED.
if (opcode==1 || opcode==2) // Remove/Replace
{
cJSON_Delete(cJSONUtils_PatchDetach(object,path->valuestring)); // Get rid of old.
if (opcode==1) return 0; // For Remove, this is job done.
}
if (opcode==3 || opcode==4) // Copy/Move uses "from".
{
cJSON *from=cJSON_GetObjectItem(patch,"from"); if (!from) return 4; // missing "from" for copy/move.
if (opcode==3) value=cJSONUtils_PatchDetach(object,from->valuestring);
if (opcode==4) value=cJSONUtils_GetPointer(object,from->valuestring);
if (!value) return 5; // missing "from" for copy/move.
if (opcode==4) value=cJSON_Duplicate(value,1);
if (!value) return 6; // out of memory for copy/move.
}
else // Add/Replace uses "value".
{
value=cJSON_GetObjectItem(patch,"value");
if (!value) return 7; // missing "value" for add/replace.
value=cJSON_Duplicate(value,1);
if (!value) return 8; // out of memory for add/replace.
}
// Now, just add "value" to "path".
char *parentptr=0,*childptr=0;cJSON *parent=0;
parentptr=strdup(path->valuestring); childptr=strrchr(parentptr,'/'); if (childptr) *childptr++=0;
parent=cJSONUtils_GetPointer(object,parentptr);
cJSONUtils_InplaceDecodePointerString(childptr);
// add, remove, replace, move, copy, test.
if (!parent) {free(parentptr); return 9;} // Couldn't find object to add to.
else if (parent->type==cJSON_Array)
{
if (!strcmp(childptr,"-")) cJSON_AddItemToArray(parent,value);
else cJSON_InsertItemInArray(parent,atoi(childptr),value);
}
else if (parent->type==cJSON_Object)
{
cJSON_DeleteItemFromObject(parent,childptr);
cJSON_AddItemToObject(parent,childptr,value);
}
free(parentptr);
return 0;
}
int cJSONUtils_ApplyPatches(cJSON *object,cJSON *patches)
{
int err;
if (!patches->type==cJSON_Array) return 1; // malformed patches.
if (patches) patches=patches->child;
while (patches)
{
if ((err=cJSONUtils_ApplyPatch(object,patches))) return err;
patches=patches->next;
}
return 0;
}