Method _execute

core/math/expression.cpp:1247–1473

}

bool Expression::_execute(const Array &p_inputs, Object *p_instance, Expression::ENode *p_node, Variant &r_ret, bool p_const_calls_only, String &r_error_str) {
	switch (p_node->type) {
		case Expression::ENode::TYPE_INPUT: {
			const Expression::InputNode *in = static_cast<const Expression::InputNode *>(p_node);
			if (in->index < 0 || in->index >= p_inputs.size()) {
				r_error_str = vformat(RTR("Invalid input %d (not passed) in expression"), in->index);
				return true;
			}
			r_ret = p_inputs[in->index];
		} break;
		case Expression::ENode::TYPE_CONSTANT: {
			const Expression::ConstantNode *c = static_cast<const Expression::ConstantNode *>(p_node);
			r_ret = c->value;

		} break;
		case Expression::ENode::TYPE_SELF: {
			if (!p_instance) {
				r_error_str = RTR("self can't be used because instance is null (not passed)");
				return true;
			}
			r_ret = p_instance;
		} break;
		case Expression::ENode::TYPE_OPERATOR: {
			const Expression::OperatorNode *op = static_cast<const Expression::OperatorNode *>(p_node);

			Variant a;
			bool ret = _execute(p_inputs, p_instance, op->nodes[0], a, p_const_calls_only, r_error_str);
			if (ret) {
				return true;
			}

			Variant b;

			if (op->nodes[1]) {
				ret = _execute(p_inputs, p_instance, op->nodes[1], b, p_const_calls_only, r_error_str);
				if (ret) {
					return true;
				}
			}

			bool valid = true;
			Variant::evaluate(op->op, a, b, r_ret, valid);
			if (!valid) {
				r_error_str = vformat(RTR("Invalid operands to operator %s, %s and %s."), Variant::get_operator_name(op->op), Variant::get_type_name(a.get_type()), Variant::get_type_name(b.get_type()));
				return true;
			}

		} break;
		case Expression::ENode::TYPE_INDEX: {
			const Expression::IndexNode *index = static_cast<const Expression::IndexNode *>(p_node);

			Variant base;
			bool ret = _execute(p_inputs, p_instance, index->base, base, p_const_calls_only, r_error_str);
			if (ret) {
				return true;
			}

			Variant idx;