Common C++ classes and routines used by my applications such as argument parser, IO and conversion utilities
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#include "./timespan.h"
#include "../conversion/stringconversion.h"
#include <cmath>
#include <iomanip>
#include <sstream>
#include <vector>
using namespace std;
namespace CppUtilities {
/*!
* \class TimeSpan
* \brief Represents a time interval.
*
* Note that the TimeSpan class is meant to express a time interval independently of the
* concrete starting DateTime and end DateTime and hence can not be expressed in years
* and month. For that use case, use the Period class instead.
*
* \remarks Time values are measured in 100-nanosecond units called ticks.
* \todo
* - Add method for parsing custom string formats.
* - Add method for printing to custom string formats.
*/
/*!
* \brief Parses the given C-style string as TimeSpan.
* \throws Throws a ConversionException if the specified \a str does not match the expected format.
*
* The expected format is "days:hours:minutes:seconds", eg. "5:31:4.521" for 5 hours, 31 minutes
* and 4.521 seconds. So parts at the front can be omitted and the parts can be fractions. The
* colon can be changed by specifying another \a separator.
*/
TimeSpan TimeSpan::fromString(const char *str, char separator)
{
if (!*str) {
return TimeSpan();
}
vector<double> parts;
size_t partsSize = 1;
for (const char *i = str; *i; ++i) {
*i == separator && ++partsSize;
}
parts.reserve(partsSize);
for (const char *i = str;;) {
if (*i == separator) {
parts.emplace_back(stringToNumber<double>(string(str, i)));
str = ++i;
} else if (*i == '\0') {
parts.emplace_back(stringToNumber<double>(string(str, i)));
break;
} else {
++i;
}
}
switch (parts.size()) {
case 1:
return TimeSpan::fromSeconds(parts.front());
case 2:
return TimeSpan::fromMinutes(parts.front()) + TimeSpan::fromSeconds(parts[1]);
case 3:
return TimeSpan::fromHours(parts.front()) + TimeSpan::fromMinutes(parts[1]) + TimeSpan::fromSeconds(parts[2]);
default:
return TimeSpan::fromDays(parts.front()) + TimeSpan::fromHours(parts[1]) + TimeSpan::fromMinutes(parts[2]) + TimeSpan::fromSeconds(parts[3]);
}
}
/*!
* \brief Converts the value of the current TimeSpan object to its equivalent std::string representation
* according the given \a format.
*
* If \a fullSeconds is true the time interval will be rounded to full seconds.
*
* The string representation will be stored in \a result.
*/
void TimeSpan::toString(string &result, TimeSpanOutputFormat format, bool fullSeconds) const
{
stringstream s(stringstream::in | stringstream::out);
TimeSpan positive(m_ticks);
if (positive.isNegative()) {
s << '-';
positive.m_ticks = -positive.m_ticks;
}
switch (format) {
case TimeSpanOutputFormat::Normal:
s << setfill('0') << setw(2) << floor(positive.totalHours()) << ":" << setw(2) << positive.minutes() << ":" << setw(2) << positive.seconds();
if (!fullSeconds) {
const int milli(positive.milliseconds());
const int micro(positive.microseconds());
const int nano(positive.nanoseconds());
if (milli || micro || nano) {
s << '.' << setw(3) << milli;
if (micro || nano) {
s << setw(3) << micro;
if (nano) {
s << nano / TimeSpan::nanosecondsPerTick;
}
}
}
}
break;
case TimeSpanOutputFormat::WithMeasures:
if (isNull()) {
result = "0 s";
return;
} else {
if (!fullSeconds && positive.totalMilliseconds() < 1.0) {
s << setprecision(2) << positive.totalMicroseconds() << " µs";
} else {
bool needWhitespace = false;
if (const int days = positive.days()) {
needWhitespace = true;
s << days << " d";
}
if (const int hours = positive.hours()) {
if (needWhitespace)
s << ' ';
needWhitespace = true;
s << hours << " h";
}
if (const int minutes = positive.minutes()) {
if (needWhitespace)
s << ' ';
needWhitespace = true;
s << minutes << " min";
}
if (const int seconds = positive.seconds()) {
if (needWhitespace)
s << ' ';
needWhitespace = true;
s << seconds << " s";
}
if (!fullSeconds) {
if (const int milliseconds = positive.milliseconds()) {
if (needWhitespace)
s << ' ';
needWhitespace = true;
s << milliseconds << " ms";
}
if (const int microseconds = positive.microseconds()) {
if (needWhitespace)
s << ' ';
needWhitespace = true;
s << microseconds << " µs";
}
if (const int nanoseconds = positive.nanoseconds()) {
if (needWhitespace)
s << ' ';
s << nanoseconds << " ns";
}
}
}
}
break;
case TimeSpanOutputFormat::TotalSeconds:
if (fullSeconds) {
s << setprecision(0);
} else {
s << setprecision(10);
}
s << positive.totalSeconds();
break;
}
result = s.str();
}
} // namespace CppUtilities