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Overview
| Comment: | Various fixes to the json_merge_patch() function. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | json_mergepatch |
| Files: | files | file ages | folders |
| SHA3-256: | f49fd2554b0723eb7cf2fd765d655c68 |
| User & Date: | drh 2017-03-23 00:13:52 |
Context
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2017-03-23
| ||
| 00:46 | Fix harmless compiler warnings in the new json_merge_patch() logic. check-in: 5d2cf5a2 user: drh tags: json_mergepatch | |
| 00:13 | Various fixes to the json_merge_patch() function. check-in: f49fd255 user: drh tags: json_mergepatch | |
|
2017-03-22
| ||
| 21:45 | Change the name of the new function to "json_merge_patch()". check-in: 53bf70f3 user: drh tags: json_mergepatch | |
Changes
Changes to ext/misc/json1.c.
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*/
static JsonNode *jsonMergePatch(
JsonParse *pParse, /* The JSON parser that contains the TARGET */
int iTarget, /* Node of the TARGET in pParse */
JsonNode *pPatch /* The PATCH */
){
int i, j;
int iApnd;
JsonNode *pTarget;
if( pPatch->eType!=JSON_OBJECT ){
return pPatch;
}
assert( iTarget>=0 && iTarget<pParse->nNode );
pTarget = &pParse->aNode[iTarget];
assert( (pPatch->jnFlags & JNODE_APPEND)==0 );
if( pTarget->eType!=JSON_OBJECT ){
for(i=2; i<pPatch->n; i += jsonNodeSize(&pPatch[i])+1){
if( pPatch[i].eType==JSON_NULL ){
pPatch[i-1].jnFlags |= JNODE_REMOVE;
}
}
return pPatch;
}
iApnd = iTarget;
for(i=1; i<pPatch->n; i += jsonNodeSize(&pPatch[i+1])+1){
int nKey;
const char *zKey;
assert( pPatch[i].eType==JSON_STRING );
assert( pPatch[i].jnFlags & JNODE_LABEL );
nKey = pPatch[i].n;
zKey = pPatch[i].u.zJContent;
if( (pPatch[i].jnFlags & JNODE_RAW)==0 ){
assert( nKey>=2 && zKey[0]=='"' && zKey[nKey-1]=='"' );
nKey -= 2;
zKey ++;
}
for(j=1; j<pTarget->n; j += jsonNodeSize(&pTarget[j+1])+1 ){
assert( pTarget[j].eType==JSON_STRING );
assert( pTarget[j].jnFlags & JNODE_LABEL );
if( jsonLabelCompare(&pTarget[j], zKey, nKey)
&& (pTarget[j+1].jnFlags & (JNODE_REMOVE|JNODE_PATCH))==0
){
if( pPatch[i+1].eType==JSON_NULL ){
pTarget[j+1].jnFlags |= JNODE_REMOVE;
}else{
JsonNode *pNew = jsonMergePatch(pParse, j+1, &pPatch[i+1]);
if( pNew==0 ) return 0;
pTarget = &pParse->aNode[iTarget];
if( pNew!=&pTarget[j+1] ){
pTarget[j+1].u.pPatch = pNew;
pTarget[j+1].jnFlags |= JNODE_PATCH;
}
}
break;
}
}
if( j>=pTarget->n ){
int iStart, iPatch;
iStart = jsonParseAddNode(pParse, JSON_OBJECT, 2, 0);
jsonParseAddNode(pParse, JSON_STRING, nKey, zKey);
iPatch = jsonParseAddNode(pParse, JSON_TRUE, 0, 0);
if( pParse->oom ) return 0;
pTarget = &pParse->aNode[iTarget];
pParse->aNode[iApnd].jnFlags |= JNODE_APPEND;
pParse->aNode[iApnd].u.iAppend = iStart;
iApnd = iStart;
pParse->aNode[iPatch].jnFlags |= JNODE_PATCH;
pParse->aNode[iPatch].u.pPatch = &pPatch[i+1];
}
}
return pTarget;
}
................................................................................
static void jsonMergePatchFunc(
sqlite3_context *ctx,
int argc,
sqlite3_value **argv
){
JsonParse x; /* The JSON that is being patched */
JsonParse y; /* The patch */
if( jsonParse(&x, ctx, (const char*)sqlite3_value_text(argv[0])) ) return;
if( jsonParse(&y, ctx, (const char*)sqlite3_value_text(argv[1])) ){
jsonParseReset(&x);
return;
}
jsonReturnJson(jsonMergePatch(&x, 0, y.aNode), ctx, 0);
jsonParseReset(&x);
jsonParseReset(&y);
}
/*
** Implementation of the json_object(NAME,VALUE,...) function. Return a JSON
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*/
static JsonNode *jsonMergePatch(
JsonParse *pParse, /* The JSON parser that contains the TARGET */
int iTarget, /* Node of the TARGET in pParse */
JsonNode *pPatch /* The PATCH */
){
int i, j;
int iRoot;
JsonNode *pTarget;
if( pPatch->eType!=JSON_OBJECT ){
return pPatch;
}
assert( iTarget>=0 && iTarget<pParse->nNode );
pTarget = &pParse->aNode[iTarget];
assert( (pPatch->jnFlags & JNODE_APPEND)==0 );
if( pTarget->eType!=JSON_OBJECT ){
for(i=2; i<=pPatch->n; i += jsonNodeSize(&pPatch[i])+1){
if( pPatch[i].eType==JSON_NULL ){
pPatch[i].jnFlags |= JNODE_REMOVE;
}
}
return pPatch;
}
iRoot = iTarget;
for(i=1; i<pPatch->n; i += jsonNodeSize(&pPatch[i+1])+1){
int nKey;
const char *zKey;
assert( pPatch[i].eType==JSON_STRING );
assert( pPatch[i].jnFlags & JNODE_LABEL );
nKey = pPatch[i].n;
zKey = pPatch[i].u.zJContent;
assert( (pPatch[i].jnFlags & JNODE_RAW)==0 );
for(j=1; j<pTarget->n; j += jsonNodeSize(&pTarget[j+1])+1 ){
assert( pTarget[j].eType==JSON_STRING );
assert( pTarget[j].jnFlags & JNODE_LABEL );
assert( (pPatch[i].jnFlags & JNODE_RAW)==0 );
if( (pTarget[j+1].jnFlags & (JNODE_REMOVE|JNODE_PATCH))==0
&& pTarget[j].n==nKey
&& strncmp(pTarget[j].u.zJContent, zKey, nKey)==0
){
if( pPatch[i+1].eType==JSON_NULL ){
pTarget[j+1].jnFlags |= JNODE_REMOVE;
}else{
JsonNode *pNew = jsonMergePatch(pParse, iTarget+j+1, &pPatch[i+1]);
if( pNew==0 ) return 0;
pTarget = &pParse->aNode[iTarget];
if( pNew!=&pTarget[j+1] ){
pTarget[j+1].u.pPatch = pNew;
pTarget[j+1].jnFlags |= JNODE_PATCH;
}
}
break;
}
}
if( j>=pTarget->n && pPatch[i+1].eType!=JSON_NULL ){
int iStart, iPatch;
iStart = jsonParseAddNode(pParse, JSON_OBJECT, 2, 0);
jsonParseAddNode(pParse, JSON_STRING, nKey, zKey);
iPatch = jsonParseAddNode(pParse, JSON_TRUE, 0, 0);
if( pParse->oom ) return 0;
pTarget = &pParse->aNode[iTarget];
pParse->aNode[iRoot].jnFlags |= JNODE_APPEND;
pParse->aNode[iRoot].u.iAppend = iStart - iRoot;
iRoot = iStart;
pParse->aNode[iPatch].jnFlags |= JNODE_PATCH;
pParse->aNode[iPatch].u.pPatch = &pPatch[i+1];
}
}
return pTarget;
}
................................................................................
static void jsonMergePatchFunc(
sqlite3_context *ctx,
int argc,
sqlite3_value **argv
){
JsonParse x; /* The JSON that is being patched */
JsonParse y; /* The patch */
JsonNode *pResult; /* The result of the merge */
if( jsonParse(&x, ctx, (const char*)sqlite3_value_text(argv[0])) ) return;
if( jsonParse(&y, ctx, (const char*)sqlite3_value_text(argv[1])) ){
jsonParseReset(&x);
return;
}
pResult = jsonMergePatch(&x, 0, y.aNode);
assert( pResult!=0 || x.oom );
if( pResult ){
jsonReturnJson(pResult, ctx, 0);
}else{
sqlite3_result_error_nomem(ctx);
}
jsonParseReset(&x);
jsonParseReset(&y);
}
/*
** Implementation of the json_object(NAME,VALUE,...) function. Return a JSON
|
Changes to test/json104.test.
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"title": "Hello!",
"phoneNumber": "+01-123-456-7890",
"author": {
"familyName": null
},
"tags": [ "example" ]
}');
} {{{"title":"Hello!","author":{"givenName":"John"},"tags":["example"],"content":"This will be unchanged",phoneNumber:"+01-123-456-7890"}}}
finish_test
|
| > > > > > > > |
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"title": "Hello!",
"phoneNumber": "+01-123-456-7890",
"author": {
"familyName": null
},
"tags": [ "example" ]
}');
} {{{"title":"Hello!","author":{"givenName":"John"},"tags":["example"],"content":"This will be unchanged","phoneNumber":"+01-123-456-7890"}}}
do_execsql_test json104-200 {
SELECT json_merge_patch('[1,2,3]','{"x":null}');
} {{{}}}
do_execsql_test json104-210 {
SELECT json_merge_patch('[1,2,3]','{"x":null,"y":1,"z":null}');
} {{{"y":1}}}
finish_test
|