63e88f80
 Hu Chunming
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// Copyright (c) 2009-2020 Vladimir Batov.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
#ifndef BOOST_CONVERT_BASE_HPP
#define BOOST_CONVERT_BASE_HPP
#include <boost/convert/parameters.hpp>
#include <boost/convert/detail/is_string.hpp>
#include <algorithm>
#include <cstring>
namespace boost { namespace cnv { template<typename> struct cnvbase; }}
#define BOOST_CNV_TO_STRING \
template<typename string_type> \
typename std::enable_if<cnv::is_string<string_type>::value, void>::type \
operator()
#define BOOST_CNV_STRING_TO \
template<typename string_type> \
typename std::enable_if<cnv::is_string<string_type>::value, void>::type \
operator()
#define BOOST_CNV_PARAM_SET(param_name) \
template <typename argument_pack> \
void set_( \
argument_pack const& arg, \
cnv::parameter::type::param_name, \
mpl::true_)
#define BOOST_CNV_PARAM_TRY(param_name) \
this->set_( \
arg, \
cnv::parameter::type::param_name(), \
typename mpl::has_key< \
argument_pack, cnv::parameter::type::param_name>::type());
template<typename derived_type>
struct boost::cnv::cnvbase
{
using this_type = cnvbase;
using int_type = int;
using uint_type = unsigned int;
using lint_type = long int;
using ulint_type = unsigned long int;
using sint_type = short int;
using usint_type = unsigned short int;
using llint_type = long long int;
using ullint_type = unsigned long long int;
using flt_type = float;
using dbl_type = double;
using ldbl_type = long double;
// Integration of user-types via operator>>()
template<typename type_in, typename type_out>
void
operator()(type_in const& in, boost::optional<type_out>& out) const
{
in >> out;
}
// Basic type to string
BOOST_CNV_TO_STRING ( int_type v, optional<string_type>& r) const { to_str_(v, r); }
BOOST_CNV_TO_STRING ( uint_type v, optional<string_type>& r) const { to_str_(v, r); }
BOOST_CNV_TO_STRING ( lint_type v, optional<string_type>& r) const { to_str_(v, r); }
BOOST_CNV_TO_STRING ( llint_type v, optional<string_type>& r) const { to_str_(v, r); }
BOOST_CNV_TO_STRING ( ulint_type v, optional<string_type>& r) const { to_str_(v, r); }
BOOST_CNV_TO_STRING (ullint_type v, optional<string_type>& r) const { to_str_(v, r); }
BOOST_CNV_TO_STRING ( sint_type v, optional<string_type>& r) const { to_str_(v, r); }
BOOST_CNV_TO_STRING ( usint_type v, optional<string_type>& r) const { to_str_(v, r); }
BOOST_CNV_TO_STRING ( flt_type v, optional<string_type>& r) const { to_str_(v, r); }
BOOST_CNV_TO_STRING ( dbl_type v, optional<string_type>& r) const { to_str_(v, r); }
BOOST_CNV_TO_STRING ( ldbl_type v, optional<string_type>& r) const { to_str_(v, r); }
// String to basic type
BOOST_CNV_STRING_TO (string_type const& s, optional< int_type>& r) const { str_to_(s, r); }
BOOST_CNV_STRING_TO (string_type const& s, optional< uint_type>& r) const { str_to_(s, r); }
BOOST_CNV_STRING_TO (string_type const& s, optional< lint_type>& r) const { str_to_(s, r); }
BOOST_CNV_STRING_TO (string_type const& s, optional< llint_type>& r) const { str_to_(s, r); }
BOOST_CNV_STRING_TO (string_type const& s, optional< ulint_type>& r) const { str_to_(s, r); }
BOOST_CNV_STRING_TO (string_type const& s, optional<ullint_type>& r) const { str_to_(s, r); }
BOOST_CNV_STRING_TO (string_type const& s, optional< sint_type>& r) const { str_to_(s, r); }
BOOST_CNV_STRING_TO (string_type const& s, optional< usint_type>& r) const { str_to_(s, r); }
BOOST_CNV_STRING_TO (string_type const& s, optional< flt_type>& r) const { str_to_(s, r); }
BOOST_CNV_STRING_TO (string_type const& s, optional< dbl_type>& r) const { str_to_(s, r); }
BOOST_CNV_STRING_TO (string_type const& s, optional< ldbl_type>& r) const { str_to_(s, r); }
template<typename argument_pack>
typename std::enable_if<boost::parameter::is_argument_pack<argument_pack>::value, derived_type&>::type
operator()(argument_pack const& arg)
{
BOOST_CNV_PARAM_TRY(base);
BOOST_CNV_PARAM_TRY(adjust);
BOOST_CNV_PARAM_TRY(precision);
BOOST_CNV_PARAM_TRY(uppercase);
BOOST_CNV_PARAM_TRY(skipws);
BOOST_CNV_PARAM_TRY(width);
BOOST_CNV_PARAM_TRY(fill);
BOOST_CNV_PARAM_TRY(notation);
// BOOST_CNV_PARAM_TRY(locale);
return this->dncast();
}
protected:
cnvbase() = default;
template<typename string_type, typename out_type>
void
str_to_(string_type const& str, optional<out_type>& result_out) const
{
cnv::range<string_type const> range (str);
if (skipws_)
for (; !range.empty() && cnv::is_space(*range.begin()); ++range);
if (range.empty()) return;
if (cnv::is_space(*range.begin())) return;
dncast().str_to(range, result_out);
}
template<typename in_type, typename string_type>
void
to_str_(in_type value_in, optional<string_type>& result_out) const
{
using char_type = typename cnv::range<string_type>::value_type;
using range_type = cnv::range<char_type*>;
using buf_type = char_type[bufsize_];
buf_type buf;
range_type range = dncast().to_str(value_in, buf);
char_type* beg = range.begin();
char_type* end = range.end();
int str_size = end - beg;
if (str_size <= 0)
return;
if (uppercase_)
for (char_type* p = beg; p < end; ++p) *p = cnv::to_upper(*p);
if (width_)
{
int num_fill = (std::max)(0, int(width_ - (end - beg)));
int num_left = adjust_ == cnv::adjust::left ? 0
: adjust_ == cnv::adjust::right ? num_fill
: (num_fill / 2);
int num_right = num_fill - num_left;
bool move = (beg < buf + num_left) // No room for left fillers
|| (buf + bufsize_ < end + num_right); // No room for right fillers
if (move)
{
std::memmove(buf + num_left, beg, str_size * sizeof(char_type));
beg = buf + num_left;
end = beg + str_size;
}
for (int k = 0; k < num_left; *(--beg) = fill_, ++k);
for (int k = 0; k < num_right; *(end++) = fill_, ++k);
}
result_out = string_type(beg, end);
}
derived_type const& dncast () const { return *static_cast<derived_type const*>(this); }
derived_type& dncast () { return *static_cast<derived_type*>(this); }
template<typename argument_pack, typename keyword_tag>
void set_(argument_pack const&, keyword_tag, mpl::false_) {}
// Formatters
BOOST_CNV_PARAM_SET(base) { base_ = arg[cnv::parameter:: base]; }
BOOST_CNV_PARAM_SET(adjust) { adjust_ = arg[cnv::parameter:: adjust]; }
BOOST_CNV_PARAM_SET(precision) { precision_ = arg[cnv::parameter::precision]; }
BOOST_CNV_PARAM_SET(uppercase) { uppercase_ = arg[cnv::parameter::uppercase]; }
BOOST_CNV_PARAM_SET(skipws) { skipws_ = arg[cnv::parameter:: skipws]; }
BOOST_CNV_PARAM_SET(width) { width_ = arg[cnv::parameter:: width]; }
BOOST_CNV_PARAM_SET(fill) { fill_ = arg[cnv::parameter:: fill]; }
BOOST_CNV_PARAM_SET(notation) { notation_ = arg[cnv::parameter:: notation]; }
// BOOST_CNV_PARAM_SET(locale) { locale_ = arg[cnv::parameter:: locale]; }
// ULONG_MAX(8 bytes) = 18446744073709551615 (20(10) or 32(2) characters)
// double (8 bytes) max is 316 chars
static int BOOST_CONSTEXPR_OR_CONST bufsize_ = 512;
bool skipws_ = false;
int precision_ = 0;
bool uppercase_ = false;
int width_ = 0;
int fill_ = ' ';
cnv::base base_ = boost::cnv::base::dec;
cnv::adjust adjust_ = boost::cnv::adjust::right;
cnv::notation notation_ = boost::cnv::notation::fixed;
// std::locale locale_;
};
#undef BOOST_CNV_TO_STRING
#undef BOOST_CNV_STRING_TO
#undef BOOST_CNV_PARAM_SET
#undef BOOST_CNV_PARAM_TRY
#endif // BOOST_CONVERT_BASE_HPP
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