/*
* Fetch a collection from the target VM.
*/
static unqlite_col * unqliteVmFetchCollection(
unqlite_vm *pVm, /* Target VM */
SyString *pName /* Lookup name */
)
{
unqlite_col *pCol;
sxu32 nHash;
if( pVm->iCol < 1 ){
/* Don't bother hashing */
return 0;
}
nHash = SyBinHash((const void *)pName->zString,pName->nByte);
/* Perform the lookup */
pCol = pVm->apCol[nHash & ( pVm->iColSize - 1)];
for(;;){
if( pCol == 0 ){
break;
}
if( nHash == pCol->nHash && SyStringCmp(pName,&pCol->sName,SyMemcmp) == 0 ){
/* Collection found */
return pCol;
}
/* Point to the next entry */
pCol = pCol->pNextCol;
}
/* No such collection */
return 0;
}
/*
* Check if the given token is a potential operator or not.
* This function is called by the lexer each time it extract a token that may
* look like an operator.
* Return a structure [i.e: jx9_expr_op instnace ] that describe the operator on success.
* Otherwise NULL.
* Note that the function take care of handling ambiguity [i.e: whether we are dealing with
* a binary minus or unary minus.]
*/
JX9_PRIVATE const jx9_expr_op * jx9ExprExtractOperator(SyString *pStr, SyToken *pLast)
{
sxu32 n = 0;
sxi32 rc;
/* Do a linear lookup on the operators table */
for(;;){
if( n >= SX_ARRAYSIZE(aOpTable) ){
break;
}
rc = SyStringCmp(pStr, &aOpTable[n].sOp, SyMemcmp);
if( rc == 0 ){
if( aOpTable[n].sOp.nByte != sizeof(char) || (aOpTable[n].iOp != EXPR_OP_UMINUS && aOpTable[n].iOp != EXPR_OP_UPLUS) || pLast == 0 ){
if( aOpTable[n].iOp == EXPR_OP_SUBSCRIPT && (pLast == 0 || (pLast->nType & (JX9_TK_ID|JX9_TK_CSB/*]*/|JX9_TK_RPAREN/*)*/)) == 0) ){
/* JSON Array not subscripting, return NULL */
return 0;
}
/* There is no ambiguity here, simply return the first operator seen */
return &aOpTable[n];
}
/* Handle ambiguity */
if( pLast->nType & (JX9_TK_LPAREN/*'('*/|JX9_TK_OCB/*'{'*/|JX9_TK_OSB/*'['*/|JX9_TK_COLON/*:*/|JX9_TK_COMMA/*, '*/) ){
/* Unary opertors have prcedence here over binary operators */
return &aOpTable[n];
}
if( pLast->nType & JX9_TK_OP ){
const jx9_expr_op *pOp = (const jx9_expr_op *)pLast->pUserData;
/* Ticket 1433-31: Handle the '++', '--' operators case */
if( pOp->iOp != EXPR_OP_INCR && pOp->iOp != EXPR_OP_DECR ){
/* Unary opertors have prcedence here over binary operators */
return &aOpTable[n];
}
}
}
++n; /* Next operator in the table */
}
/* No such operator */
return 0;
}
