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More aggressive use of jsonBlobEdit(). Improvements to the MergePatch

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implementation sketch.

FossilOrigin-Name: fbca9570fd2e1465739e4d3a8d9bb40fad594fd78ab49b2cb34efa27ebdd8361
This commit is contained in:
drh
2023-11-28 00:27:58 +00:00
parent eb04a0bb7b
commit f46f89df97
3 changed files with 31 additions and 24 deletions
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41
src/json.c
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@@ -3809,8 +3809,8 @@ static void jsonAfterEditSizeAdjust(JsonParse *pParse, u32 iRoot){
** nDel may be zero, in which case no bytes are removed. But iDel is
** still important as new bytes will be insert beginning at iDel.
**
** nIns may be zero, in which case no new bytes are inserted. aIns might
** be a NULL pointer in this case.
** aIns may be zero, in which case space is created to hold nIns bytes
** beginning at iDel, but that space is uninitialized.
**
** Set pParse->oom if an OOM occurs.
*/
@@ -3833,7 +3833,7 @@ static void jsonBlobEdit(
pParse->nBlob += d;
pParse->delta += d;
}
if( nIns ) memcpy(&pParse->aBlob[iDel], aIns, nIns);
if( nIns && aIns ) memcpy(&pParse->aBlob[iDel], aIns, nIns);
}
/*
@@ -3940,19 +3940,14 @@ static u32 jsonLookupBlobStep(
ix.nBlobAlloc = sizeof(aLabel);
jsonBlobAppendNodeType(&ix,JSONB_TEXTRAW, nKey);
if( jsonBlobMakeEditable(pParse, ix.nBlob+nKey) ){
/* This is similar to jsonBlobEdit() except that the inserted
** bytes come from two different places, ix.aBlob and pParse->aBlob. */
nIns = ix.nBlob + nKey + pParse->nIns;
jsonBlobEdit(pParse, j, 0, 0, nIns);
assert( pParse->nBlob + pParse->nIns <= pParse->nBlobAlloc );
memmove(&pParse->aBlob[j+nIns], &pParse->aBlob[j],
pParse->nBlob - j);
memcpy(&pParse->aBlob[j], ix.aBlob, ix.nBlob);
k = j + ix.nBlob;
memcpy(&pParse->aBlob[k], zKey, nKey);
k += nKey;
memcpy(&pParse->aBlob[k], pParse->aIns, pParse->nIns);
pParse->delta = nIns;
pParse->nBlob += nIns;
jsonAfterEditSizeAdjust(pParse, iRoot);
}
return j;
@@ -5030,13 +5025,13 @@ static JsonNode *jsonMergePatch(
** else:
** return Patch
**
** Here is the same algorithm restrictured to show the actual
** Here is an equivalent algorithm restructured to show the actual
** implementation:
**
** 01 define MergePatch(Target, Patch):
** 02 if Patch is not an Object:
** 03 return Patch
** 04 else: // if Patch is an Object:
** 04 else: // if Patch is an Object
** 05 if Target is not an Object:
** 06 Target = {}
** 07 for each Name/Value pair in Patch:
@@ -5046,8 +5041,11 @@ static JsonNode *jsonMergePatch(
** 11 else
** 12 Target[name] = MergePatch(Target[Name], Value)
** 13 else if Value is not NULL:
** 14 Target[name] = RemoveNullVAlues(Value)
** 15 return Target
** 14 if Value is not an Object:
** 15 Target[name] = Value
** 16 else:
** 17 Target[name] = MergePatch('{}',value)
** 18 return Target
** |
** ^---- Line numbers referenced in comments in the implementation
*/
@@ -5161,10 +5159,19 @@ static int jsonMergePatchBlob(
}
}else if( x>0 ){ /* Algorithm line 13 */
/* No match and patch value is not NULL */
jsonBlobEdit(pTarget, iTEnd, 0,
pPatch->aBlob+iPValue, szPValue+nPValue);
if( pTarget->oom ) return JSON_MERGE_OOM;
jsonBlobRemoveNullsFromObject(pTarget, iTEnd);
if( pPatch->aBlob[iPValue] & 0x0f)!=JSONB_OBJECT ){
jsonBlobEdit(pTarget, iTEnd, 0,
pPatch->aBlob+iPValue, szPValue+nPValue, 0, 0);
if( pTarget->oom ) return JSON_MERGE_OOM;
}else{
u32 szNew = szPLabel+nPLabel;
jsonBlobEdit(pTarget, iTEnd, 0, 0, szNew+1);
if( pTarget->oom ) return JSON_MERGE_OOM;
memcpy(&pTarget->aBlob[iTEnd], &pPatch->aBlob[iPLabel], szNew);
pTarget->aBlob[iTEnd+szNew] = 0x00;
rc = jsonMergePatch(pTarget, iTEnd+szNew, pPatch, iPValue);
if( rc ) return rc;
}
}
}
jsonAfterEditSizeAdjust(pTarget, iTarget);