PromptBuilder::validateMessages(): void

Source

private function validateMessages(): void
{
    if (empty($this->messages)) {
        throw new InvalidArgumentException('Cannot generate from an empty prompt. Add content using withText() or similar methods.');
    }
    $firstMessage = reset($this->messages);
    if (!$firstMessage->getRole()->isUser()) {
        throw new InvalidArgumentException('The first message must be from a user role, not from ' . $firstMessage->getRole()->value);
    }
    $lastMessage = end($this->messages);
    if (!$lastMessage->getRole()->isUser()) {
        throw new InvalidArgumentException('The last message must be from a user role, not from ' . $lastMessage->getRole()->value);
    }
    if (empty($lastMessage->getParts())) {
        throw new InvalidArgumentException('The last message must have content parts. Add content using withText() or similar methods.');
    }
}

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