265 lines
9.3 KiB
C++
265 lines
9.3 KiB
C++
#ifndef CONVERSION_UTILITIES_STRINGBUILDER_H
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#define CONVERSION_UTILITIES_STRINGBUILDER_H
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#include "../misc/traits.h"
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#include "./stringconversion.h"
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#include <string>
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#include <tuple>
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namespace ConversionUtilities {
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/// \cond
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namespace Helper {
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template <class StringType, Traits::EnableIf<std::is_class<StringType>> * = nullptr> std::size_t computeTupleElementSize(const StringType *str)
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{
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return str->size();
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}
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template <class StringType, Traits::EnableIf<std::is_class<StringType>> * = nullptr> std::size_t computeTupleElementSize(const StringType &str)
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{
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return str.size();
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}
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template <class StringType, class CharType, Traits::EnableIf<std::is_same<typename StringType::value_type, CharType>> * = nullptr>
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std::size_t computeTupleElementSize(const CharType *str)
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{
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return std::char_traits<CharType>::length(str);
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}
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template <class StringType, class CharType, Traits::EnableIf<std::is_same<typename StringType::value_type, CharType>> * = nullptr>
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constexpr std::size_t computeTupleElementSize(CharType)
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{
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return 1;
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}
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template <class StringType, typename IntegralType,
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Traits::EnableIf<Traits::Not<std::is_same<typename StringType::value_type, IntegralType>>, std::is_integral<IntegralType>,
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std::is_unsigned<IntegralType>> * = nullptr>
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std::size_t computeTupleElementSize(IntegralType number, typename StringType::value_type base = 10)
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{
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std::size_t size = 0;
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for (auto n = number; n; n /= base, ++size)
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;
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return size;
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}
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template <class StringType, typename IntegralType,
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Traits::EnableIf<Traits::Not<std::is_same<typename StringType::value_type, IntegralType>>, std::is_integral<IntegralType>,
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std::is_signed<IntegralType>> * = nullptr>
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std::size_t computeTupleElementSize(IntegralType number, typename StringType::value_type base = 10)
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{
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std::size_t size = number < 0 ? 1 : 0;
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for (auto n = number; n; n /= base, ++size)
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;
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return size;
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}
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template <class StringType, Traits::EnableIf<std::is_class<StringType>> * = nullptr> void append(StringType &target, const StringType *str)
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{
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target.append(*str);
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}
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template <class StringType, Traits::EnableIf<std::is_class<StringType>> * = nullptr> void append(StringType &target, const StringType &str)
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{
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target.append(str);
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}
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template <class StringType, class CharType, Traits::EnableIf<std::is_same<typename StringType::value_type, CharType>> * = nullptr>
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void append(StringType &target, const CharType *str)
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{
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target.append(str);
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}
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template <class StringType, class CharType, Traits::EnableIf<std::is_same<typename StringType::value_type, CharType>> * = nullptr>
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void append(StringType &target, CharType c)
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{
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target += c;
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}
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template <class StringType, typename IntegralType,
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Traits::EnableIf<Traits::Not<std::is_same<typename StringType::value_type, IntegralType>>, std::is_integral<IntegralType>,
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std::is_unsigned<IntegralType>> * = nullptr>
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void append(StringType &target, IntegralType number, typename StringType::value_type base = 10)
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{
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const auto start = target.begin() + target.size();
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do {
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target.insert(start, digitToChar<typename StringType::value_type>(number % base));
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number /= base;
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} while (number);
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}
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template <class StringType, typename IntegralType,
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Traits::EnableIf<Traits::Not<std::is_same<typename StringType::value_type, IntegralType>>, std::is_integral<IntegralType>,
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std::is_signed<IntegralType>> * = nullptr>
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void append(StringType &target, IntegralType number, typename StringType::value_type base = 10)
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{
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if (number < 0) {
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target += '-';
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number = -number;
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}
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const auto start = target.begin() + target.size();
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do {
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target.insert(start, digitToChar<typename StringType::value_type>(number % base));
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number /= base;
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} while (number);
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}
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template <class StringType, class Tuple, std::size_t N> struct TupleToString {
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static std::size_t precomputeSize(const Tuple &tuple)
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{
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return TupleToString<StringType, Tuple, N - 1>::precomputeSize(tuple) + computeTupleElementSize<StringType>(std::get<N - 1>(tuple));
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}
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static void append(const Tuple &tuple, StringType &str)
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{
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TupleToString<StringType, Tuple, N - 1>::append(tuple, str);
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Helper::append(str, std::get<N - 1>(tuple));
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}
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};
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template <class StringType, class Tuple> struct TupleToString<StringType, Tuple, 1> {
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static std::size_t precomputeSize(const Tuple &tuple)
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{
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return computeTupleElementSize<StringType>(std::get<0>(tuple));
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}
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static void append(const Tuple &tuple, StringType &str)
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{
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Helper::append(str, std::get<0>(tuple));
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}
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};
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} // namespace Helper
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/// \endcond
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/*!
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* \brief Concatenates all strings hold by the specified \a tuple.
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*/
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template <class StringType = std::string, class... Args> StringType tupleToString(const std::tuple<Args...> &tuple)
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{
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StringType res;
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res.reserve(Helper::TupleToString<StringType, decltype(tuple), sizeof...(Args)>::precomputeSize(tuple));
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Helper::TupleToString<StringType, decltype(tuple), sizeof...(Args)>::append(tuple, res);
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return res;
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}
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template <class StringType = std::string, class... Args> constexpr StringType argsToString(Args &&... args)
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{
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return tupleToString(std::make_tuple(args...));
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}
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/*!
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* \brief Allows construction of string-tuples via %-operator, eg. string1 % "string2" % string3.
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*/
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template <class Tuple> constexpr auto operator%(const Tuple &lhs, const std::string &rhs) -> decltype(std::tuple_cat(lhs, std::make_tuple(&rhs)))
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{
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return std::tuple_cat(lhs, std::make_tuple(&rhs));
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}
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/*!
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* \brief Allows construction of string-tuples via %-operator, eg. string1 % "string2" % string3.
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*/
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template <class Tuple> constexpr auto operator%(const Tuple &lhs, const char *rhs) -> decltype(std::tuple_cat(lhs, std::make_tuple(rhs)))
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{
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return std::tuple_cat(lhs, std::make_tuple(rhs));
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}
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/*!
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* \brief Allows construction of string-tuples via %-operator, eg. string1 % "string2" % string3.
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*/
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template <class Tuple, typename IntegralType, Traits::EnableIf<std::is_integral<IntegralType>> * = nullptr>
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constexpr auto operator%(const Tuple &lhs, IntegralType rhs) -> decltype(std::tuple_cat(lhs, std::make_tuple(rhs)))
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{
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return std::tuple_cat(lhs, std::make_tuple(rhs));
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}
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/*!
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* \brief Allows construction of string-tuples via %-operator, eg. string1 % "string2" % string3.
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*/
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constexpr auto operator%(const std::string &lhs, const std::string &rhs) -> decltype(std::make_tuple(&lhs, &rhs))
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{
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return std::make_tuple(&lhs, &rhs);
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}
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/*!
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* \brief Allows construction of string-tuples via %-operator, eg. string1 % "string2" % string3.
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*/
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constexpr auto operator%(const char *lhs, const std::string &rhs) -> decltype(std::make_tuple(lhs, &rhs))
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{
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return std::make_tuple(lhs, &rhs);
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}
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/*!
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* \brief Allows construction of string-tuples via %-operator, eg. string1 % "string2" % string3.
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*/
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constexpr auto operator%(const std::string &lhs, const char *rhs) -> decltype(std::make_tuple(&lhs, rhs))
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{
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return std::make_tuple(&lhs, rhs);
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}
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/*!
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* \brief Allows construction of string-tuples via %-operator, eg. string1 % "string2" % string3.
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*/
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constexpr auto operator%(const std::string &lhs, char rhs) -> decltype(std::make_tuple(&lhs, rhs))
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{
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return std::make_tuple(&lhs, rhs);
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}
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/*!
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* \brief Allows construction of string-tuples via %-operator, eg. string1 % "string2" % string3.
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*/
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constexpr auto operator%(char lhs, const std::string &rhs) -> decltype(std::make_tuple(lhs, &rhs))
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{
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return std::make_tuple(lhs, &rhs);
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}
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/*!
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* \brief Allows construction of final string from previously constructed string-tuple and trailing string via +-operator.
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*
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* This is meant to be used for fast string building without multiple heap allocation, eg.
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*
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* ```
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* printVelocity("velocity: " % numberToString(velocityExample) % " km/h (" % numberToString(velocityExample / 3.6) + " m/s)"));
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* ```
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*/
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template <class Tuple, Traits::EnableIf<Traits::IsSpecializationOf<Tuple, std::tuple>> * = nullptr>
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inline std::string operator+(const Tuple &lhs, const std::string &rhs)
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{
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return tupleToString(std::tuple_cat(lhs, std::make_tuple(&rhs)));
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}
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/*!
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* \brief Allows construction of final string from previously constructed string-tuple and trailing string via +-operator.
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*
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* This is meant to be used for fast string building without multiple heap allocation, eg.
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*
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* ```
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* printVelocity("velocity: " % numberToString(velocityExample) % " km/h (" % numberToString(velocityExample / 3.6) + " m/s)"));
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* ```
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*/
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template <class Tuple, Traits::EnableIf<Traits::IsSpecializationOf<Tuple, std::tuple>> * = nullptr>
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inline std::string operator+(const Tuple &lhs, const char *rhs)
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{
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return tupleToString(std::tuple_cat(lhs, std::make_tuple(rhs)));
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}
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/*!
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* \brief Allows construction of final string from previously constructed string-tuple and trailing char via +-operator.
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*
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* This is meant to be used for fast string building without multiple heap allocation, eg.
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*
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* ```
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* printVelocity("velocity: " % numberToString(velocityExample) % " km/h (" % numberToString(velocityExample / 3.6) + " m/s)"));
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* ```
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*/
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template <class Tuple, typename IntegralType,
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Traits::EnableIf<Traits::IsSpecializationOf<Tuple, std::tuple>, std::is_integral<IntegralType>> * = nullptr>
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inline std::string operator+(const Tuple &lhs, IntegralType rhs)
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{
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return tupleToString(std::tuple_cat(lhs, std::make_tuple(rhs)));
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}
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} // namespace ConversionUtilities
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#endif // CONVERSION_UTILITIES_STRINGBUILDER_H
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