Function stringcompute

libop/memory/ProcessMemory.cpp:147–198

like AA+BB+DD-CC*cc. Use size_t so x64 absolute addresses parse correctly.

// like AA+BB+DD-CC*cc. Use size_t so x64 absolute addresses parse correctly.
size_t stringcompute(const wchar_t *s) {
    if (!s || !*s)
        return 0;
    wstring num;
    vector<size_t> ns;
    vector<wchar_t> os;
    while (true) {
        if (*s && !is_op(*s)) {
            num.push_back(*s++);
            continue;
        }

        if (!num.empty()) {
            ns.push_back(parse_hex_word(num));
            num.clear();
        }

        if (*s == 0)
            break;

        if (ns.empty()) {
            os.push_back(*s++);
            continue;
        }

        if (!os.empty()) {
            const wchar_t pending = os.back();
            if (get_op_prior(pending) >= get_op_prior(*s)) {
                const size_t num2 = pop_back_value(ns);
                const size_t num1 = pop_back_value(ns);
                const wchar_t popped = pop_back_value(os);
                ns.push_back(do_op_ptr(num1, num2, popped));
                continue;
            }
        }

        os.push_back(*s++);
    }

    while (!os.empty()) {
        if (ns.size() < 2)
            break;
        const size_t num2 = pop_back_value(ns);
        const size_t num1 = pop_back_value(ns);
        const wchar_t popped = pop_back_value(os);
        ns.push_back(do_op_ptr(num1, num2, popped));
    }

    if (ns.empty())
        return 0;
    return ns.back();
}

} // namespace