Function _AST_GetProcCallAliases

src/ast/ast_validations.c:156–183

Extract identifiers / aliases from a procedure call.

// Extract identifiers / aliases from a procedure call.
static void _AST_GetProcCallAliases
(
	const cypher_astnode_t *node,  // ast-node to validate
	rax *identifiers               // rax to extract identifiers to
) {
	// CALL db.labels() yield label
	// CALL db.labels() yield label as l
	ASSERT(node && identifiers);
	ASSERT(cypher_astnode_type(node) == CYPHER_AST_CALL);

	// traverse projections, collecting the identifiers and expressions
	uint projection_count = cypher_ast_call_nprojections(node);
	for(uint i = 0; i < projection_count; i++) {
		const char *identifier = NULL;
		const cypher_astnode_t *proj_node = cypher_ast_call_get_projection(node, i);
		const cypher_astnode_t *alias_node = cypher_ast_projection_get_alias(proj_node);
		if(alias_node) {
			// Alias is given: YIELD label AS l.
			identifier = cypher_ast_identifier_get_name(alias_node);
			raxInsert(identifiers, (unsigned char *)identifier, strlen(identifier), NULL, NULL);
		}
		// Introduce expression-identifier as well
		// Example: YIELD label --> label is introduced (removed outside of scope)
		const cypher_astnode_t *exp_node = cypher_ast_projection_get_expression(proj_node);
		identifier = cypher_ast_identifier_get_name(exp_node);
		raxInsert(identifiers, (unsigned char *)identifier, strlen(identifier), NULL, NULL);
	}
}

// make sure multi-hop traversals has length greater than or equal to zero
static AST_Validation _ValidateMultiHopTraversal