azurite
Version:
An open source Azure Storage API compatible server
36 lines • 1.5 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.validateQueryTree = void 0;
const tslib_1 = require("tslib");
const BinaryOperatorNode_1 = tslib_1.__importDefault(require("./QueryNodes/BinaryOperatorNode"));
const IdentifierNode_1 = tslib_1.__importDefault(require("./QueryNodes/IdentifierNode"));
const NotNode_1 = tslib_1.__importDefault(require("./QueryNodes/NotNode"));
/**
* Validates that the provided query tree represents a valid query.
*
* That is, a query containing at least one conditional expression,
* where every conditional expression operates on at least
* one column or built-in identifier (i.e. comparison between two constants is not allowed).
*
* @param {IQueryNode} queryTree
*/
function validateQueryTree(queryTree) {
const identifierReferences = countIdentifierReferences(queryTree);
if (identifierReferences === 0) {
throw new Error("Invalid Query, no identifier references found.");
}
}
exports.validateQueryTree = validateQueryTree;
function countIdentifierReferences(queryTree) {
if (queryTree instanceof IdentifierNode_1.default) {
return 1;
}
if (queryTree instanceof BinaryOperatorNode_1.default) {
return countIdentifierReferences(queryTree.left) + countIdentifierReferences(queryTree.right);
}
if (queryTree instanceof NotNode_1.default) {
return countIdentifierReferences(queryTree.right);
}
return 0;
}
//# sourceMappingURL=QueryValidator.js.map