C++ XString::xislice_t方法代碼示例

bool read_constdb(ZString filename)
{
    io::ReadFile in(filename);
    if (!in.is_open())
    {
        PRINTF("can't read %s\n"_fmt, filename);
        return false;
    }

    bool rv = true;
    AString line_;
    while (in.getline(line_))
    {
        // is_comment only works for whole-line comments
        // that could change once the Z dependency is dropped ...
        LString comment = "//"_s;
        XString line = line_.xislice_h(std::search(line_.begin(), line_.end(), comment.begin(), comment.end())).rstrip();
        if (!line)
            continue;
        // "%m[A-Za-z0-9_] %i %i"

        // TODO promote either qsplit() or asplit()
        auto _it = std::find(line.begin(), line.end(), ' ');
        auto name = line.xislice_h(_it);
        auto _rest = line.xislice_t(_it);
        while (_rest.startswith(' '))
            _rest = _rest.xslice_t(1);
        auto _it2 = std::find(_rest.begin(), _rest.end(), ' ');
        auto val_ = _rest.xislice_h(_it2);
        auto type_ = _rest.xislice_t(_it2);
        while (type_.startswith(' '))
            type_ = type_.xslice_t(1);
        // yes, the above actually DTRT even for underlength input

        int val;
        int type = 0;
        // Note for future archeaologists: this code is indented correctly
        if (std::find_if_not(name.begin(), name.end(),
                    [](char c)
                    {
                        return ('0' <= c && c <= '9')
                            || ('A' <= c && c <= 'Z')
                            || ('a' <= c && c <= 'z')
                            || (c == '_');
                    }) != name.end()
                || !extract(val_, &val)
                || (!extract(type_, &type) && type_))
        {
            PRINTF("Bad const line: %s\n"_fmt, line_);
            rv = false;
            continue;
        }
        P<str_data_t> n = add_strp(name);
        n->type = type ? StringCode::PARAM : StringCode::INT;
        n->val = val;
    }
    return rv;
}

inline
bool extract(XString str, HumanTimeDiff *iv)
{
    // str is a sequence of [-+]?[0-9]+([ay]|m|[jd]|h|mn|s)
    // there are NO spaces here
    // parse by counting the number starts
    auto is_num = [](char c)
    { return c == '-' || c == '+' || ('0' <= c && c <= '9'); };
    if (!str || !is_num(str.front()))
        return false;
    *iv = HumanTimeDiff{};
    while (str)
    {
        auto it = std::find_if_not(str.begin(), str.end(), is_num);
        auto it2 = std::find_if(it, str.end(), is_num);
        XString number = str.xislice_h(it);
        XString suffix = str.xislice(it, it2);
        str = str.xislice_t(it2);

        short *ptr = nullptr;
        if (suffix == "y"_s || suffix == "a"_s)
            ptr = &iv->year;
        else if (suffix == "m"_s)
            ptr = &iv->month;
        else if (suffix == "j"_s || suffix == "d"_s)
            ptr = &iv->day;
        else if (suffix == "h"_s)
            ptr = &iv->hour;
        else if (suffix == "mn"_s)
            ptr = &iv->minute;
        else if (suffix == "s"_s)
            ptr = &iv->second;
        else
            return false;
        if (number.startswith('+') && !number.startswith("+-"_s))
            number = number.xslice_t(1);
        if (*ptr || !extract(number, ptr))
            return false;
    }
    return true;
}

/// Return a pair of strings, {spellname, parameter}
/// Parameter may be empty.
static
std::pair<XString, XString> magic_tokenise(XString src)
{
    auto seeker = std::find(src.begin(), src.end(), ' ');

    if (seeker == src.end())
    {
        return {src, XString()};
    }
    else
    {
        XString rv1 = src.xislice_h(seeker);
        ++seeker;

        while (seeker != src.end() && *seeker == ' ')
            ++seeker;

        // Note: this very well could be empty
        XString rv2 = src.xislice_t(seeker);
        return {rv1, rv2};
    }
}

//---------------------------------------------------
// E-mail check: return 0 (not correct) or 1 (valid).
//---------------------------------------------------
bool e_mail_check(XString email)
{
    // athena limits
    if (email.size() < 3 || email.size() > 39)
        return 0;

    // part of RFC limits (official reference of e-mail description)
    XString::iterator at = std::find(email.begin(), email.end(), '@');
    if (at == email.end())
        return 0;
    XString username = email.xislice_h(at);
    XString hostname = email.xislice_t(at + 1);
    if (!username || !hostname)
        return 0;
    if (hostname.contains('@'))
        return 0;
    if (hostname.front() == '.' || hostname.back() == '.')
        return 0;
    if (hostname.contains_seq(".."))
        return 0;
    if (email.contains_any(" ;"))
        return 0;
    return email.is_print();
}