#include <assert.h>
#include <algorithm>
+#include <sstream>
#include <QTextStream>
#include <QDebug>
namespace pv {
namespace util {
-static const QString SIPrefixes[17] =
- {"y", "z", "a", "f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G",
- "T", "P", "E", "Z", "Y"};
-const int FirstSIPrefix = 8;
-const int FirstSIPrefixPower = -(FirstSIPrefix * 3);
+static const QString SIPrefixes[17] = {
+ "y", "z",
+ "a", "f", "p",
+ "n", QChar(0x03BC), "m",
+ "",
+ "k", "M", "G",
+ "T", "P", "E",
+ "Z", "Y"};
+const int EmptySIPrefix = 8;
+const int FirstSIPrefixPower = -(EmptySIPrefix * 3);
const double MinTimeDelta = 1e-15; // Anything below 1 fs can be considered zero
-static QString format_si_value(double v, QString unit, int prefix,
+// Insert the timestamp value into the stream in fixed-point notation
+// (and honor the precision)
+static QTextStream& operator<<(QTextStream& stream, const Timestamp& t)
+{
+ // The multiprecision types already have a function and a stream insertion
+ // operator to convert them to a string, however these functions abuse a
+ // precision value of zero to print all available decimal places instead of
+ // none, and the boost authors refuse to fix this because they don't want
+ // to break buggy code that relies on this bug.
+ // (https://svn.boost.org/trac/boost/ticket/10103)
+ // Therefore we have to work around the case where precision is zero.
+
+ int precision = stream.realNumberPrecision();
+
+ std::ostringstream ss;
+ ss << std::fixed;
+
+ if (stream.numberFlags() & QTextStream::ForceSign) {
+ ss << std::showpos;
+ }
+
+ if (0 == precision) {
+ ss
+ << std::setprecision(1)
+ << round(t);
+ } else {
+ ss
+ << std::setprecision(precision)
+ << t;
+ }
+
+ std::string str(ss.str());
+ if (0 == precision) {
+ // remove the separator and the unwanted decimal place
+ str.resize(str.size() - 2);
+ }
+
+ return stream << QString::fromStdString(str);
+}
+
+QString format_si_value(const Timestamp& v, QString unit, int prefix,
unsigned int precision, bool sign)
{
if (prefix < 0) {
- int exp = -FirstSIPrefixPower;
-
- prefix = 0;
- while ((fabs(v) * pow(10.0, exp)) > 999.0 &&
- prefix < (int)(countof(SIPrefixes) - 1)) {
- prefix++;
- exp -= 3;
+ // No prefix given, calculate it
+
+ if (v.is_zero()) {
+ prefix = EmptySIPrefix;
+ } else {
+ int exp = -FirstSIPrefixPower;
+
+ prefix = 0;
+ while ((fabs(v) * pow(10.0, exp)) > 999.0 &&
+ prefix < (int)(countof(SIPrefixes) - 1)) {
+ prefix++;
+ exp -= 3;
+ }
}
}
assert(prefix >= 0);
assert(prefix < (int)countof(SIPrefixes));
- const double multiplier = pow(10.0,
+ const Timestamp multiplier = pow(Timestamp(10),
(int)- prefix * 3 - FirstSIPrefixPower);
QString s;
QTextStream ts(&s);
- if (sign)
+ if (sign && !v.is_zero())
ts << forcesign;
- ts << fixed << qSetRealNumberPrecision(precision) <<
- (v * multiplier) << " " << SIPrefixes[prefix] << unit;
+ ts
+ << qSetRealNumberPrecision(precision)
+ << (v * multiplier)
+ << ' '
+ << SIPrefixes[prefix]
+ << unit;
return s;
}
-QString format_si_value(const Timestamp& v, QString unit, int prefix,
- unsigned int precision, bool sign)
-{
- return format_si_value(v.convert_to<double>(), unit, prefix, precision, sign);
-}
-
static QString pad_number(unsigned int number, int length)
{
return QString("%1").arg(number, length, 10, QChar('0'));
-(prefix * 3 + pv::util::FirstSIPrefixPower);
const unsigned int relative_prec =
- (prefix >= pv::util::FirstSIPrefix) ? precision :
+ (prefix >= EmptySIPrefix) ? precision :
std::max((int)(precision - prefix_order), 0);
return format_si_value(t, unit, prefix, relative_prec);
QString format_second(const Timestamp& second)
{
- return format_si_value(second.convert_to<double>(), "s", -1, 0, false);
+ return format_si_value(second, "s", -1, 0, false);
}
} // namespace util