mirror of git://sigrok.org/pulseview
251 lines
6.5 KiB
C++
251 lines
6.5 KiB
C++
/*
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* This file is part of the PulseView project.
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*
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* Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "util.hpp"
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#include <extdef.h>
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#include <algorithm>
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#include <cassert>
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#include <sstream>
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#include <QDebug>
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#include <QTextStream>
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using std::fixed;
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using std::max;
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using std::ostringstream;
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using std::setfill;
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using std::setprecision;
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using std::showpos;
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using std::string;
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using namespace Qt;
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namespace pv {
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namespace util {
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static QTextStream& operator<<(QTextStream& stream, SIPrefix prefix)
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{
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switch (prefix) {
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case SIPrefix::yocto: return stream << 'y';
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case SIPrefix::zepto: return stream << 'z';
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case SIPrefix::atto: return stream << 'a';
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case SIPrefix::femto: return stream << 'f';
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case SIPrefix::pico: return stream << 'p';
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case SIPrefix::nano: return stream << 'n';
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case SIPrefix::micro: return stream << QChar(0x03BC);
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case SIPrefix::milli: return stream << 'm';
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case SIPrefix::kilo: return stream << 'k';
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case SIPrefix::mega: return stream << 'M';
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case SIPrefix::giga: return stream << 'G';
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case SIPrefix::tera: return stream << 'T';
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case SIPrefix::peta: return stream << 'P';
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case SIPrefix::exa: return stream << 'E';
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case SIPrefix::zetta: return stream << 'Z';
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case SIPrefix::yotta: return stream << 'Y';
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default: return stream;
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}
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}
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int exponent(SIPrefix prefix)
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{
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return 3 * (static_cast<int>(prefix) - static_cast<int>(SIPrefix::none));
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}
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static SIPrefix successor(SIPrefix prefix)
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{
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assert(prefix != SIPrefix::yotta);
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return static_cast<SIPrefix>(static_cast<int>(prefix) + 1);
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}
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// Insert the timestamp value into the stream in fixed-point notation
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// (and honor the precision)
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static QTextStream& operator<<(QTextStream& stream, const Timestamp& t)
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{
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// The multiprecision types already have a function and a stream insertion
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// operator to convert them to a string, however these functions abuse a
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// precision value of zero to print all available decimal places instead of
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// none, and the boost authors refuse to fix this because they don't want
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// to break buggy code that relies on this bug.
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// (https://svn.boost.org/trac/boost/ticket/10103)
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// Therefore we have to work around the case where precision is zero.
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int precision = stream.realNumberPrecision();
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ostringstream ss;
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ss << fixed;
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if (stream.numberFlags() & QTextStream::ForceSign)
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ss << showpos;
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if (0 == precision)
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ss << setprecision(1) << round(t);
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else
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ss << setprecision(precision) << t;
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string str(ss.str());
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if (0 == precision) {
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// remove the separator and the unwanted decimal place
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str.resize(str.size() - 2);
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}
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return stream << QString::fromStdString(str);
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}
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QString format_time_si(const Timestamp& v, SIPrefix prefix,
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unsigned int precision, QString unit, bool sign)
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{
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if (prefix == SIPrefix::unspecified) {
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// No prefix given, calculate it
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if (v.is_zero()) {
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prefix = SIPrefix::none;
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} else {
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int exp = exponent(SIPrefix::yotta);
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prefix = SIPrefix::yocto;
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while ((fabs(v) * pow(Timestamp(10), exp)) > 999 &&
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prefix < SIPrefix::yotta) {
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prefix = successor(prefix);
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exp -= 3;
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}
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}
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}
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assert(prefix >= SIPrefix::yocto);
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assert(prefix <= SIPrefix::yotta);
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const Timestamp multiplier = pow(Timestamp(10), -exponent(prefix));
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QString s;
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QTextStream ts(&s);
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if (sign && !v.is_zero())
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ts << forcesign;
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ts << qSetRealNumberPrecision(precision) << (v * multiplier) << ' '
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<< prefix << unit;
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return s;
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}
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QString format_time_si_adjusted(const Timestamp& t, SIPrefix prefix,
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unsigned precision, QString unit, bool sign)
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{
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// The precision is always given without taking the prefix into account
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// so we need to deduct the number of decimals the prefix might imply
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const int prefix_order = -exponent(prefix);
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const unsigned int relative_prec =
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(prefix >= SIPrefix::none) ? precision :
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max((int)(precision - prefix_order), 0);
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return format_time_si(t, prefix, relative_prec, unit, sign);
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}
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// Helper for 'format_time_minutes()'.
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static QString pad_number(unsigned int number, int length)
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{
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return QString("%1").arg(number, length, 10, QChar('0'));
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}
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QString format_time_minutes(const Timestamp& t, signed precision, bool sign)
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{
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const Timestamp whole_seconds = floor(abs(t));
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const Timestamp days = floor(whole_seconds / (60 * 60 * 24));
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const unsigned int hours = fmod(whole_seconds / (60 * 60), 24).convert_to<uint>();
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const unsigned int minutes = fmod(whole_seconds / 60, 60).convert_to<uint>();
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const unsigned int seconds = fmod(whole_seconds, 60).convert_to<uint>();
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QString s;
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QTextStream ts(&s);
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if (t < 0)
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ts << "-";
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else if (sign)
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ts << "+";
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bool use_padding = false;
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// DD
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if (days) {
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ts << days.str().c_str() << ":";
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use_padding = true;
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}
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// HH
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if (hours || days) {
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ts << pad_number(hours, use_padding ? 2 : 0) << ":";
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use_padding = true;
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}
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// MM
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ts << pad_number(minutes, use_padding ? 2 : 0);
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ts << ":";
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// SS
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ts << pad_number(seconds, 2);
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if (precision) {
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ts << ".";
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const Timestamp fraction = fabs(t) - whole_seconds;
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ostringstream ss;
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ss << fixed << setprecision(precision) << setfill('0') << fraction;
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string fs = ss.str();
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// Copy all digits, inserting spaces as unit separators
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for (int i = 1; i <= precision; i++) {
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// Start at index 2 to skip the "0." at the beginning
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ts << fs.at(1 + i);
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if ((i > 0) && (i % 3 == 0) && (i != precision))
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ts << " ";
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}
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}
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return s;
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}
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/**
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* Split a string into tokens at occurences of the separator.
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*
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* @param[in] text The input string to split.
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* @param[in] separator The delimiter between tokens.
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*
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* @return A vector of broken down tokens.
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*/
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vector<string> split_string(string text, string separator)
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{
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vector<string> result;
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size_t pos;
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while ((pos = text.find(separator)) != std::string::npos) {
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result.push_back(text.substr(0, pos));
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text = text.substr(pos + separator.length());
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}
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result.push_back(text);
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return result;
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}
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} // namespace util
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} // namespace pv
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