ipedit/ipv4int.cpp at main · mikolainer/ipedit · GitHub

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#include "ipv4int.h"

#include <QRegularExpression>
#include "ipv4.h"

IpV4Int::IpV4Int(const QString &value) : m_text(value) {}

bool IpV4Int::is_valid() const
{
    bool ok = false;
    const unsigned long val = m_text.toULong(&ok);
    return ok && val <= max_value && !m_text.contains(QRegularExpression("\\D")) &&
           m_text != "" &&
           (!m_text.startsWith('0') || m_text == "0");
}

bool IpV4Int::is_invalid() const
{
    bool ok = false;
    const unsigned long val = m_text.toULong(&ok);

    return ok && !m_text.contains(QRegularExpression("\\D")) &&
           (val > max_value || (m_text.startsWith('0') && m_text != "0"));
}

bool IpV4Int::can_insert_first_separtor_to(const int inserted_index) const
{
    if (!is_valid())
        return false;

    static const int octet_max_value_len = QString::number(IpV4::Octet::max_value).length();
    static const int max_len_of_text_after_first_dot = (IpV4::norm_octets_count -1) * octet_max_value_len;

    const int text_len_after_first_dot = m_text.length() - inserted_index;
    const QString text_before_first_dot = m_text.left(inserted_index);
    const ulong value_before_first_dot = text_before_first_dot.toULong();

    return
        text_len_after_first_dot <= max_len_of_text_after_first_dot
        &&
        value_before_first_dot <= IpV4::Octet::max_value;
}

QString IpV4Int::insert_separators(const int first_separator_index) const
{
    if (m_text.count(IpV4::octet_separator) >= IpV4::norm_separators_count)
        return m_text;

    QString result = m_text;
    result.insert(first_separator_index, IpV4::octet_separator);

    auto it = result.begin() + first_separator_index +1;
    while (result.count(IpV4::octet_separator) < IpV4::norm_separators_count)
    {
        int octet_val = 0;
        while (it != result.end())
        {
            const int growed_octet_val = (octet_val * 10) + (it->toLatin1() - '0');
            if (growed_octet_val > IpV4::Octet::max_value) break;
            it++;
            octet_val = growed_octet_val;
        }

        if (it == result.end())
        {
            result.append(IpV4::octet_separator);
            it = result.end();
        }
        else
        {
            const auto it_index = std::distance(result.begin(), it);
            result.insert(it_index, IpV4::octet_separator);
            it = result.begin() + it_index +1;
        }
    }

    return result;
}