123 lines
3.4 KiB
C++
123 lines
3.4 KiB
C++
#ifndef POSITIONINSET_H
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#define POSITIONINSET_H
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#include "./global.h"
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#include <c++utilities/conversion/stringconversion.h>
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#include <string>
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namespace Media {
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/*!
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* \class Media::PositionInSet
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* \brief The PositionInSet class describes the position of an element in a
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* set which consists of a certain number of elements.
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*
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* This class is used to parse and store values like "9/11" which are used
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* by some tag formats to denote track positions.
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*/
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class TAG_PARSER_EXPORT PositionInSet
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{
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public:
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constexpr PositionInSet(int32 position = 0, int32 total = 0);
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template <typename StringType = std::string>
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PositionInSet(const StringType &numericString);
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constexpr int32 position() const;
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constexpr int32 total() const;
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constexpr bool isNull() const;
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constexpr bool operator==(const PositionInSet &other) const;
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template <typename StringType = std::string>
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StringType toString() const;
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private:
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int32 m_position;
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int32 m_total;
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};
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/*!
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* \brief Constructs a new Position in set from the specified numeric string.
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* \tparam StringType The type of the string (should be an instantiation of the basic_string class template).
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* \param numericString Specifies the string containing the position and possibly
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* the total element count (separated by "/").
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*/
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template <typename StringType>
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PositionInSet::PositionInSet(const StringType &numericString) :
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m_position(0),
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m_total(0)
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{
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size_t separator = numericString.find('/');
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if(separator == StringType::npos || separator == numericString.length() - 1) {
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m_position = ConversionUtilities::stringToNumber<int32, StringType>(numericString);
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} else if(separator == 0) {
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m_total = ConversionUtilities::stringToNumber<int32, StringType>(numericString.substr(1));
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} else {
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m_position = ConversionUtilities::stringToNumber<int32, StringType>(numericString.substr(0, separator));
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m_total = ConversionUtilities::stringToNumber<int32, StringType>(numericString.substr(separator + 1));
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}
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}
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/*!
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* \brief Constructs a new Position in set of the specified element \a position and \a total element count.
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* \param position
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* \param total
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*/
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constexpr inline PositionInSet::PositionInSet(int32 position, int32 total) :
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m_position(position),
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m_total(total)
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{}
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/*!
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* \brief Returns the element position of the current instance.
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*/
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constexpr inline int32 PositionInSet::position() const
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{
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return m_position;
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}
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/*!
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* \brief Returns the total element count of the current instance.
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*/
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constexpr inline int32 PositionInSet::total() const
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{
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return m_total;
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}
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/*!
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* \brief Returns an indication whether both the element position and total element count is 0.
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*/
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constexpr inline bool PositionInSet::isNull() const
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{
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return m_position == 0 && m_total == 0;
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}
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/*!
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* \brief Returns whether this instance equals \a other.
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*/
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constexpr inline bool PositionInSet::operator==(const PositionInSet &other) const
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{
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return m_position == other.m_position && m_total == other.m_total;
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}
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/*!
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* \brief Returns the string representation of the current PositionInSet.
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*/
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template <typename StringType>
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StringType PositionInSet::toString() const
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{
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std::basic_stringstream<typename StringType::value_type> ss;
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if(m_position) {
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ss << m_position;
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}
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if(m_total) {
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ss << '/' << m_total;
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}
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return ss.str();
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}
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}
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#endif // POSITIONINSET_H
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