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The rule for the RHS of the ->> and -> operators when the RHS does not begin

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with $ is that it must be (1) all digits, or (2) all alphanumerics, or
(3) contained within [..] or else it will become a quoted label.

FossilOrigin-Name: 0e059a546ec11fa5c6d007bd65c249ee2422f1facbdb2792c53e0bc0ccc97e14
This commit is contained in:
drh
2023-12-06 15:35:38 +00:00
parent 91ec00c25a
commit 6a8581d828
3 changed files with 28 additions and 13 deletions
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24
src/json.c
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@@ -3272,6 +3272,20 @@ static void jsonArrayLengthFunc(
jsonParseFree(p);
}
/* True if the string is all digits */
static int jsonAllDigits(const char *z, int n){
int i;
for(i=0; i<n && sqlite3Isdigit(z[i]); i++){}
return i==n;
}
/* True if the string is all alphanumerics and underscores */
static int jsonAllAlphanum(const char *z, int n){
int i;
for(i=0; i<n && (sqlite3Isalnum(z[i]) || z[i]=='_'); i++){}
return i==n;
}
/*
** json_extract(JSON, PATH, ...)
** "->"(JSON,PATH)
@@ -3329,15 +3343,19 @@ static void jsonExtractFunc(
** [NUMBER] ==> $[NUMBER] // Not PG. Purely for convenience
*/
jsonStringInit(&jx, ctx);
if( sqlite3Isdigit(zPath[0]) ){
if( jsonAllDigits(zPath, nPath) ){
jsonAppendRawNZ(&jx, "[", 1);
jsonAppendRaw(&jx, zPath, nPath);
jsonAppendRawNZ(&jx, "]", 2);
}else if( zPath[0]!='[' ){
}else if( jsonAllAlphanum(zPath, nPath) ){
jsonAppendRawNZ(&jx, ".", 1);
jsonAppendRaw(&jx, zPath, nPath);
}else{
}else if( zPath[0]=='[' && nPath>=3 && zPath[nPath-1]==']' ){
jsonAppendRaw(&jx, zPath, nPath);
}else{
jsonAppendRawNZ(&jx, ".\"", 2);
jsonAppendRaw(&jx, zPath, nPath);
jsonAppendRawNZ(&jx, "\"", 1);
}
jsonStringTerminate(&jx);
j = jsonLookupStep(p, 0, jx.zBuf, 0);