Method move_to

smallthinker/common/chat-parser.h:36–41

    const common_chat_syntax & syntax() const { return syntax_; }

    void move_to(size_t pos) {
        if (pos > input_.size()) {
            throw std::runtime_error("Invalid position!");
        }
        pos_ = pos;
    }
    void move_back(size_t n) {
        if (pos_ < n) {
            throw std::runtime_error("Can't move back that far!");