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Utility function to generate the patch between two objects.

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This commit is contained in:
Dave Gamble 2016-05-29 18:16:19 +01:00
parent e79fa9472b
commit 3a7bd6924a
3 changed files with 48 additions and 1 deletions
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35
cJSON_Utils.c
View File

@ -343,7 +343,8 @@ static cJSON *cJSONUtils_SortList(cJSON *list)
void cJSONUtils_SortObject(cJSON *object) {object->child=cJSONUtils_SortList(object->child);} void cJSONUtils_SortObject(cJSON *object) {object->child=cJSONUtils_SortList(object->child);}
cJSON* cJSONUtils_MergePatch(cJSON *target, cJSON *patch) { cJSON* cJSONUtils_MergePatch(cJSON *target, cJSON *patch)
{
if (!patch || patch->type != cJSON_Object) {cJSON_Delete(target);return cJSON_Duplicate(patch,1);} if (!patch || patch->type != cJSON_Object) {cJSON_Delete(target);return cJSON_Duplicate(patch,1);}
if (!target || target->type != cJSON_Object) {cJSON_Delete(target);target=cJSON_CreateObject();} if (!target || target->type != cJSON_Object) {cJSON_Delete(target);target=cJSON_CreateObject();}
@ -360,3 +361,35 @@ cJSON* cJSONUtils_MergePatch(cJSON *target, cJSON *patch) {
} }
return target; return target;
} }
cJSON *cJSONUtils_GenerateMergePatch(cJSON *from,cJSON *to)
{
cJSON *patch=0;
if (!to) return cJSON_CreateNull();
if (to->type!=cJSON_Object || !from || from->type!=cJSON_Object) return cJSON_Duplicate(to,1);
cJSONUtils_SortObject(from);
cJSONUtils_SortObject(to);
from=from->child;to=to->child;
patch=cJSON_CreateObject();
while (from || to)
{
int compare=from?(to?strcmp(from->string,to->string):-1):1;
if (compare<0)
{
cJSON_AddItemToObject(patch,from->string,cJSON_CreateNull());
from=from->next;
}
else if (compare>0)
{
cJSON_AddItemToObject(patch,to->string,cJSON_Duplicate(to,1));
to=to->next;
}
else
{
if (cJSONUtils_Compare(from,to)) cJSON_AddItemToObject(patch,to->string,cJSONUtils_GenerateMergePatch(from,to));
from=from->next;to=to->next;
}
}
if (!patch->child) {cJSON_Delete(patch);return 0;}
return patch;
}

1
cJSON_Utils.h
View File

@ -23,6 +23,7 @@ int cJSONUtils_ApplyPatches(cJSON *object,cJSON *patches); /* Returns 0 for succ
/* Implement RFC7386 (https://tools.ietf.org/html/rfc7396) JSON Merge Patch spec. */ /* Implement RFC7386 (https://tools.ietf.org/html/rfc7396) JSON Merge Patch spec. */
cJSON* cJSONUtils_MergePatch(cJSON *target, cJSON *patch); /* target will be modified by patch. return value is new ptr for target. */ cJSON* cJSONUtils_MergePatch(cJSON *target, cJSON *patch); /* target will be modified by patch. return value is new ptr for target. */
cJSON *cJSONUtils_GenerateMergePatch(cJSON *from,cJSON *to); /* generates a patch to move from -> to */
char *cJSONUtils_FindPointerFromObjectTo(cJSON *object,cJSON *target); /* Given a root object and a target object, construct a pointer from one to the other. */ char *cJSONUtils_FindPointerFromObjectTo(cJSON *object,cJSON *target); /* Given a root object and a target object, construct a pointer from one to the other. */

13
test_utils.c
View File

@ -149,4 +149,17 @@ int main()
free(before);free(patchtext);free(after);cJSON_Delete(object);cJSON_Delete(patch); free(before);free(patchtext);free(after);cJSON_Delete(object);cJSON_Delete(patch);
} }
/* Generate Merge tests: */
for (i=0;i<15;i++)
{
cJSON *from=cJSON_Parse(merges[i][0]);
cJSON *to=cJSON_Parse(merges[i][2]);
cJSON *patch=cJSONUtils_GenerateMergePatch(from,to);
from=cJSONUtils_MergePatch(from,patch);
char *patchtext=cJSON_PrintUnformatted(patch);
char *patchedtext=cJSON_PrintUnformatted(from);
printf("Patch [%s] vs [%s] = [%s] vs [%s] (%s)\n",patchtext,merges[i][1],patchedtext,merges[i][2],strcmp(patchedtext,merges[i][2])?"FAIL":"OK");
cJSON_Delete(from);cJSON_Delete(to);cJSON_Delete(patch);free(patchtext);free(patchedtext);
}
} }