Function AST_Validate_ParseResultRoot

src/ast/ast_validations.c:2137–2168

This function checks for the existence a valid root in the query. * As cypher_parse_result_t can have multiple roots such as comments, * only a query that has a root with type CYPHER_AST_STATEMENT is considered valid. * Comment roots are ignored. */

 * only a query that has a root with type CYPHER_AST_STATEMENT is considered valid.
 * Comment roots are ignored. */
AST_Validation AST_Validate_ParseResultRoot
(
	const cypher_parse_result_t *result,
	int *index
) {
	// Check for failures in libcypher-parser
	ASSERT(AST_ContainsErrors(result) == false);

	uint nroots = cypher_parse_result_nroots(result);
	for(uint i = 0; i < nroots; i++) {
		const cypher_astnode_t *root = cypher_parse_result_get_root(result, i);
		cypher_astnode_type_t root_type = cypher_astnode_type(root);
		if(root_type == CYPHER_AST_LINE_COMMENT || root_type == CYPHER_AST_BLOCK_COMMENT ||
		   root_type == CYPHER_AST_COMMENT) {
			continue;
		} else if(root_type != CYPHER_AST_STATEMENT) {
			ErrorCtx_SetError("Encountered unsupported query type '%s'", cypher_astnode_typestr(root_type));
			return AST_INVALID;
		} else {
			// We got a statement.
			*index = i;
			return AST_VALID;
		}
	}

	// query with no roots like ';'
	if(nroots == 0) {
		ErrorCtx_SetError("Error: empty query.");
	}

	return AST_INVALID;
}

// validate a query
AST_Validation AST_Validate_Query