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#pragma once
// extract.hpp - a simple, hierarchical, tokenizer
//
// Copyright © 2012-2013 Ben Longbons <b.r.longbons@gmail.com>
//
// This file is part of The Mana World (Athena server)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "fwd.hpp"
#include <cerrno>
#include <cstdlib>
#include <algorithm>
#include <chrono>
#include <vector>
#include "../ints/wrap.hpp"
#include "../strings/xstring.hpp"
#include "../compat/time_t.hpp"
#include "../generic/enum.hpp"
namespace tmwa
{
template<class T>
bool extract(XString str, T t);
template<class T, typename=typename std::enable_if<std::is_integral<T>::value && !std::is_same<T, char>::value && !std::is_same<T, bool>::value>::type>
bool impl_extract(XString str, T *iv)
{
if (!str || str.size() > 20)
return false;
if (!((str.front() == '-' && std::is_signed<T>::value)
|| ('0' <= str.front() && str.front() <= '9')))
return false;
// needs a NUL, but can't always be given one. TODO VString?
char buf[20 + 1];
std::copy(str.begin(), str.end(), buf);
buf[str.size()] = '\0';
char *end;
errno = 0;
if (std::is_signed<T>::value)
{
long long v = strtoll(buf, &end, 10);
if (errno || *end)
return false;
*iv = v;
return *iv == v;
}
else
{
unsigned long long v = strtoull(buf, &end, 10);
if (errno || *end)
return false;
*iv = v;
return *iv == v;
}
}
inline
bool impl_extract(XString str, TimeT *tv)
{
return extract(str, &tv->value);
}
template<class T, typename=typename std::enable_if<std::is_enum<T>::value>::type>
bool extract_as_int(XString str, T *iv)
{
typedef typename underlying_type<T>::type U;
U v;
// defer to integer version
if (!extract(str, &v))
return false;
// TODO check bounds using enum min/max as in SSCANF
*iv = static_cast<T>(v);
return true;
}
bool impl_extract(XString str, XString *rv);
bool impl_extract(XString str, RString *rv);
bool impl_extract(XString str, AString *rv);
template<uint8_t N>
bool impl_extract(XString str, VString<N> *out)
{
if (str.size() > N)
return false;
*out = str;
return true;
}
inline
bool impl_extract(XString str, LString exact)
{
return str == exact;
}
template<class T>
class LStripper
{
public:
T impl;
};
template<class T>
LStripper<T> lstripping(T v)
{
return {v};
}
template<class T>
bool impl_extract(XString str, LStripper<T> out)
{
return extract(str.lstrip(), out.impl);
}
// basically just a std::tuple
// but it provides its data members publically
template<char split, int n, class... T>
class Record;
template<char split, int n>
class Record<split, n>
{
};
template<char split, int n, class F, class... R>
class Record<split, n, F, R...>
{
public:
F frist;
Record<split, n - 1, R...> rest;
public:
Record(F f, R... r)
: frist(f), rest(r...)
{}
};
template<char split, class... T>
Record<split, sizeof...(T), T...> record(T... t)
{
return Record<split, sizeof...(T), T...>(t...);
}
template<char split, int n, class... T>
Record<split, n, T...> record(T... t)
{
static_assert(0 < n && n < sizeof...(T), "don't be silly");
return Record<split, n, T...>(t...);
}
template<char split, int n>
bool impl_extract(XString str, Record<split, n>)
{
return !str;
}
template<char split, int n, class F, class... R>
bool impl_extract(XString str, Record<split, n, F, R...> rec)
{
XString::iterator s = std::find(str.begin(), str.end(), split);
XString::iterator s2 = s;
if (s2 != str.end())
++s2;
XString head = str.xislice_h(s);
XString tail = str.xislice_t(s2);
if (s == str.end())
return (extract(head, rec.frist) && n <= 1)
|| (!head && n <= 0);
return (extract(head, rec.frist) || n <= 0)
&& extract(tail, rec.rest);
}
template<char split, class T>
struct VRecord
{
std::vector<T> *arr;
};
template<char split, class T>
VRecord<split, T> vrec(std::vector<T> *arr)
{
return {arr};
}
template<char split, class T>
bool impl_extract(XString str, VRecord<split, T> rec)
{
if (!str)
return true;
XString::iterator s = std::find(str.begin(), str.end(), split);
rec.arr->emplace_back();
if (s == str.end())
return extract(str, &rec.arr->back());
return extract(str.xislice_h(s), &rec.arr->back())
&& extract(str.xislice_t(s + 1), rec);
}
template<class R>
bool impl_extract(XString str, Wrapped<R> *w)
{
return extract(str, &w->_value);
}
bool impl_extract(XString str, std::chrono::nanoseconds *ns);
bool impl_extract(XString str, std::chrono::microseconds *us);
bool impl_extract(XString str, std::chrono::milliseconds *ms);
bool impl_extract(XString str, std::chrono::seconds *s);
bool impl_extract(XString str, std::chrono::minutes *min);
bool impl_extract(XString str, std::chrono::hours *h);
bool impl_extract(XString str, std::chrono::duration<int, std::ratio<60*60*24>> *d);
// this must come after all non-`namespace tmwa` `impl_extract`s.
// In particular, the ones for `*int*` and `std::chrono::*`
template<class T>
bool extract(XString str, T t)
{
return impl_extract(str, t);
}
} // namespace tmwa
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