expression_literal eval(
const std::string &name,
const expression_function::argtype_list_type &arg_types,
expression_container::expr_list_type &args
) {
if (name == "XOR") {
if (arg_types.size() != 2
or args.size() != 2
or arg_types[0] != expression::TYPE_BOOL
or arg_types[1] != expression::TYPE_BOOL
or args[0]->infer_type() != expression::TYPE_BOOL
or args[1]->infer_type() != expression::TYPE_BOOL
) {
throw uhd::syntax_error("eval(): XOR type mismatch");
}
return expression_literal(bool(
args[0]->eval().get_bool() xor args[1]->eval().get_bool()
));
}
if (name == "AND") {
if (arg_types.size() != 2
or args.size() != 2
or arg_types[0] != expression::TYPE_BOOL
or arg_types[1] != expression::TYPE_BOOL
or args[0]->infer_type() != expression::TYPE_BOOL
or args[1]->infer_type() != expression::TYPE_BOOL
) {
throw uhd::syntax_error("eval(): AND type mismatch");
}
std::cout << "Calling AND" << std::endl;
and_counter++;
return expression_literal(bool(
args[0]->eval().get_bool() and args[1]->eval().get_bool()
));
}
if (name == "ADD") {
if (args.size() != 2) {
throw uhd::syntax_error("eval(): ADD type mismatch");
}
if ((args[0]->infer_type() == expression::TYPE_INT) and
(args[1]->infer_type() == expression::TYPE_INT)) {
return expression_literal(int(
args[0]->eval().get_int() + args[1]->eval().get_int()
));
}
else if ((args[0]->infer_type() == expression::TYPE_DOUBLE) and
(args[1]->infer_type() == expression::TYPE_DOUBLE)) {
return expression_literal(double(
args[0]->eval().get_double() + args[1]->eval().get_double()
));
}
throw uhd::syntax_error("eval(): ADD type mismatch");
}
throw uhd::syntax_error("eval(): unknown function");
}
expression_literal variable_get_value(const std::string &var_name)
{
if (var_name == "spp") {
std::cout << "Returning value for $spp..." << std::endl;
return expression_literal(5);
}
if (var_name == "is_true") {
std::cout << "Returning value for $is_true..." << std::endl;
return expression_literal(true);
}
throw uhd::syntax_error("Cannot read value (unknown variable)");
}
// Some bogus function to test the registry
expression_literal add_plus2_int(expression_container::expr_list_type args)
{
return expression_literal(args[0]->eval().get_int() + args[1]->eval().get_int() + 2);
}
// Some bogus function to test the registry
expression_literal dummy_false(expression_container::expr_list_type)
{
dummy_false_counter++;
std::cout << "Running dummy/false statement." << std::endl;
return expression_literal(false);
}
