Function _consume_function_call_expression

src/ast/ast.c:35–64

Note each function call within given expression Example: given the expression: "abs(max(min(a), abs(k)))" referred_funcs will include: "abs", "max" and "min".

// Example: given the expression: "abs(max(min(a), abs(k)))"
// referred_funcs will include: "abs", "max" and "min".
static void _consume_function_call_expression
(
	const cypher_astnode_t *node,
	rax *referred_funcs
) {
	cypher_astnode_type_t type = cypher_astnode_type(node);

	if(type == CYPHER_AST_APPLY_OPERATOR ||
	   type == CYPHER_AST_APPLY_ALL_OPERATOR) {
		// Expression is an Apply or Apply All operator.
		bool apply_all = (type == CYPHER_AST_APPLY_ALL_OPERATOR);

		// Retrieve the function name and add to rax.
		const cypher_astnode_t *func = (!apply_all) ?
									   cypher_ast_apply_operator_get_func_name(node) :
									   cypher_ast_apply_all_operator_get_func_name(node);

		const char *func_name = cypher_ast_function_name_get_value(func);
		raxInsert(referred_funcs, (unsigned char *)func_name, strlen(func_name),
				  NULL, NULL);

		if(apply_all) return;  // Apply All operators have no arguments.
	}

	uint child_count = cypher_astnode_nchildren(node);
	for(int i = 0; i < child_count; i++) {
		const cypher_astnode_t *child = cypher_astnode_get_child(node, i);
		_consume_function_call_expression(child, referred_funcs);
	}
}

// this function returns the actual root of the query
// as cypher_parse_result_t can have multiple roots such as comments