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