C++ FunctionParser::Eval方法代码示例

void Excitation::CalcCustomExcitation(double f0, int nTS, string signal)
{
	if (dT==0) return;
	if (nTS<=0) return;

	Length = (unsigned int)(nTS);
//	cerr << "Operator::CalcSinusExcitation: Length of the excite signal: " << ExciteLength << " timesteps" << endl;
	delete[] Signal_volt;
	delete[] Signal_curr;
	Signal_volt = new FDTD_FLOAT[Length+1];
	Signal_curr = new FDTD_FLOAT[Length+1];
	Signal_volt[0]=0.0;
	Signal_curr[0]=0.0;
	FunctionParser fParse;
	fParse.AddConstant("pi", 3.14159265358979323846);
	fParse.AddConstant("e", 2.71828182845904523536);
	fParse.Parse(signal,"t");
	if (fParse.GetParseErrorType()!=FunctionParser::FP_NO_ERROR)
	{
		cerr << "Operator::CalcCustomExcitation: Function Parser error: " << fParse.ErrorMsg() << endl;
		exit(1);
	}
	double vars[1];
	for (unsigned int n=1; n<Length+1; ++n)
	{
		vars[0] = (n-1)*dT;
		Signal_volt[n] = fParse.Eval(vars);
		vars[0] += 0.5*dT;
		Signal_curr[n] = fParse.Eval(vars);
	}

	m_f_max = f0;
	m_foi = f0;
	SetNyquistNum( CalcNyquistNum(f0,dT) );
}

double ribi::gtst::ParametersGroupReAssign::CalculateNextPeriodPayoff(const double average_payoff) const
{
  FunctionParser f;
  //Parse the formula
  f.Parse(m_next_period_payoff_function,"p");
  assert(f.GetParseErrorType()== FunctionParser::FP_NO_ERROR);

  //Evaluate the parsed formula
  const double payoffs[1] = { average_payoff };
  const double payoff_for_reaching_next_period = f.Eval(payoffs);

  if (f.EvalError()!=0)
  {
    std::clog
      << "Function \'"
      << m_next_period_payoff_function
      << "\'could not be evaluated"
      << " for a payoff of "
      << average_payoff
      << '\n';
    return 0.0;
  }

  return payoff_for_reaching_next_period;
}

void Primitive::calculateFunctionDefPointCoor()
{
   float x, y, dx, x1, y1, x2, y2;

   FunctionParser fparser;   // Function parser object
   double funcVals[1];

   // Setup first and last point of the curve
   defPointCoor[0] = enteredPointCoor[0];
   defPointCoor[1] = enteredPointCoor[1];
   defPointCoor[2*(nDefPoints-1)] = enteredPointCoor[2];
   defPointCoor[2*(nDefPoints-1)+1] = enteredPointCoor[3];
   
   // Define some shotcuts
   x1 = enteredPointCoor[0];   // First point of the curve
   y1 = enteredPointCoor[1];
   x2 = enteredPointCoor[2];   // Last point of the curve
   y2 = enteredPointCoor[3];

   dx = (x2-x1)/(FUNCTION_DEF_POINTS-1);

   // Generate the points that will define the curve
   for (int j = 1; j < nDefPoints - 1; j++) {
      x = x1 + j*dx;
      funcVals[0] = x;
      fparser.Parse(function, "x");
      y = fparser.Eval(funcVals);

      defPointCoor[2*j] = x;
      defPointCoor[2*j+1] = y;
   }
}  // End of function calculateFunctionDefPointCoor()

//-------------------------------------------------------------------------------------------------
double BenchFParser::DoBenchmark(const std::string& sExpr, long iCount)
{
   double fRes (0);
   double fSum (0);

   FunctionParser Parser;
   Parser.AddConstant("pi", (double)M_PI);
   Parser.AddConstant("e", (double)M_E);

   if (Parser.Parse(sExpr.c_str(), "a,b,c,x,y,z,w") >= 0)
   {
      StopTimerAndReport(Parser.ErrorMsg());
      return m_fTime1;
   }
   else
   {
      double vals[] = {
                        1.1,
                        2.2,
                        3.3,
                        2.123456,
                        3.123456,
                        4.123456,
                        5.123456
                      };

      fRes = Parser.Eval(vals);

      StartTimer();

      for (int j = 0; j < iCount; ++j)
      {
         fSum += Parser.Eval(vals);
         std::swap(vals[0], vals[1]);
         std::swap(vals[3], vals[4]);
      }

      StopTimer(fRes, fSum, iCount);
   }

   return m_fTime1;
}

QtDialog::QtDialog(QWidget *parent) :
  QDialog(parent),
  ui(new Ui::QtDialog),
  m_curve(new QwtPlotCurve("Sine")),
  m_plot(new QwtPlot(QwtText("CppQwtExample1")))
{
  ui->setupUi(this);

  assert(!this->layout());
  QLayout * const my_layout = new QVBoxLayout;
  this->setLayout(my_layout);

  #ifndef NDEBUG
  my_layout->addWidget(new QLabel("DEBUG"));
  #else
  my_layout->addWidget(new QLabel("RELEASE"));
  #endif

  my_layout->addWidget(new QLabel( ("GCC version: " + GetGccVersion()).c_str()));
  //my_layout->addWidget(new QLabel( ("Qt Creator version: " + GetQtCreatorVersion()).c_str()));
  my_layout->addWidget(new QLabel( ("STL version: " + GetStlVersion()).c_str()));
  my_layout->addWidget(new QLabel( ("Boost version: " + GetBoostVersion()).c_str()));


  {
    FunctionParser f;
    f.Parse("x * x","x");
    assert(f.GetParseErrorType()== FunctionParser::FP_NO_ERROR);
    const double xs[1] = { M_PI };
    const double y = f.Eval(xs);
    assert(f.EvalError()==0);
    my_layout->addWidget(new QLabel("Warp's function parser version: 4.5.1"));
  }
  {
    m_plot->setGeometry(0,0,640,400);
    m_plot->setAxisScale(QwtPlot::xBottom, 0.0,2.0 * M_PI);
    m_plot->setAxisScale(QwtPlot::yLeft,-1.0,1.0);
    std::vector<double> xs;
    std::vector<double> ys;
    for (double x = 0; x < 2.0 * M_PI; x+=(M_PI / 10.0))
    {
      xs.push_back(x);
      ys.push_back(std::sin(x));
    }
    QwtPointArrayData * const data = new QwtPointArrayData(&xs[0],&ys[0],xs.size());
    m_curve->setData(data);
    m_curve->attach(m_plot);
    m_plot->replot();
    my_layout->addWidget(m_plot);
  }
}

ribi::FunctionPlotterMainDialog::FunctionPlotterMainDialog(
  const std::string& formula,
  const double x_min,
  const double x_max,
  const int n_cols
) : m_x(std::vector<double>(n_cols,0.0)),
    m_y(std::vector<double>(n_cols,0.0))
{
  #ifndef NDEBUG
  assert(Rescale(2.0,1.0,5.0,0.0,100.0) >= 24.9999 && Rescale(2.0,1.0,5.0,0.0,100.0) < 25.0001);
  #endif

  FunctionParser f;

  f.Parse(formula,"x");
  if (f.GetParseErrorType()!= FunctionParser::FP_NO_ERROR)
  {
    throw std::runtime_error("Function cannot not be parsed");
  }

  if (x_min >= x_max)
  {
    throw std::runtime_error("Value of x_min must be smaller than x_max");
  }

  //Evaluate the function in a 2D std::vector
  const double n_cols_d = static_cast<double>(n_cols);

  for (int x = 0; x!=n_cols; ++x)
  {
    const double xD = static_cast<double>(x);
    const double x_scaled = Rescale(xD,0.0,n_cols_d,x_min,x_max);
    const double xs[1] = { x_scaled };
    const double y = f.Eval(xs);
    if (!f.EvalError())
    {
      m_y[x] = y;
    }
    else
    {
      m_y[x] = 0.0;
    }
    m_x[x] = x_scaled;
  }

}

//_____________________________________________________________________________
//
void tf_set_formula()
//-----------------------------------------------------------------------------
{
  // Parse transfer function formula
  if( tf_fun_formula[0] == '\0' ) return ;
  FunctionParser fparser ;
  int res = fparser.Parse( (const char*)tf_fun_formula, "x" ) ;
  if( fparser.GetParseErrorType() != FunctionParser::NO_SYNTAX_ERROR )
  {
    printf( "transfer formula error: %s\n\t%s\n\t% *d\n", fparser.ErrorMsg(), tf_fun_formula, res, 1 ) ;
    return ;
  }


  // Retreives the color map
  if( tf_colmap < 0 || tf_colmap >= CMAP_NB ) return ;
  const float *colmap = cmaps[tf_colmap] ;

  // allocate the transfer function
  int tf_size = tf_sym ? 512 : 256 ;
  vsvr.tf_set_intern() ;
  vsvr.tf_set_size( tf_size ) ;
  vsvr.tf_alloc() ;

  // fills the texture
  float  x = 0.0f ;
  float dx = 1.0f / (tf_size-1) ;
  for( int i = 0 ; i < tf_size ; ++i, x += dx )
  {
    int k = i ;
    // symmetric
    if( i > 255 ) k = 511 - i ;
    // inverse
    if( tf_inv ) k = 255 - k ;
    const float *col = colmap + 3*k ;

    float a = fparser.Eval( &x ) ;
    if( a < 0.0f ) a = 0.0f ;
    if( a > 1.0f ) a = 1.0f ;

    vsvr.tf_set( i, col[0], col[1], col[2], a*opacity ) ;
  }

  force_reload = true ;
}

void  GraphOption::generate_function(QString name,QString formula){

  m_button_generate_function->setEnabled(false);


  //ferification of name and formula input
  if(name.isEmpty() || formula.isEmpty()){
    core::NLog::global()->add_error("Please give function's name and formula.");
    m_button_generate_function->setEnabled(true);
    return;
  }

  //check if the function name already exist
  for(int i=0; i < m_data_table->rowCount(); ++i){
    if((((QLabel *)m_data_table->cellWidget(i,0))->text()) == name){
      core::NLog::global()->add_error("The function name already exist.");
      m_button_generate_function->setEnabled(true);
      return;
    }
  }

  FunctionParser fparser;

  //get all fct name separated by ','
  QString variable = "";
  for(int i=1; i < m_data_table->rowCount(); ++i){
    if(!(((QLabel *)m_data_table->cellWidget(i,0))->text()).isEmpty()){
      if(!variable.isEmpty()){
        variable += ",";
      }
      variable.append(((QLabel *)m_data_table->cellWidget(i,0))->text());
    }
  }

  //parsing function
  int res = fparser.Parse(formula.toStdString().c_str(),
                          variable.toStdString().c_str());

  if(res > 0){
    core::NLog::global()->add_error("The function is not recognized.");
    m_button_generate_function->setEnabled(true);
    return;
  }

  //<to remove>
  int max_it = 0;
  if(m_data_table->rowCount()>0)
  {
    max_it = m_fcts->size();
  }else{
    core::NLog::global()->add_error("The function is not recognized.");
    m_button_generate_function->setEnabled(true);
    return;
  }
  //</to remove>

  //generate the new function's data
  std::vector<double> vector_temp(max_it);

  double vals[m_data_table->rowCount()-1];
  for(int i=0;i<max_it;++i)
  {
    for(int j=0;j<m_data_table->rowCount()-1;++j)
    {
      vals[j] = (*m_fcts)[i][j+1];
    }
    vector_temp[i] = fparser.Eval(vals);
  }

  //add the new function
  this->add_data(vector_temp,name,formula);

  //get back the button and clear the name and function line
  m_button_generate_function->setEnabled(true);
  m_line_function->clear();
  m_line_function_name->clear();

}

//-------------------------------------------------------------------------------------------------
double BenchFParser::DoBenchmark(const std::string& sExpr, long iCount)
{
   double fRes = 0.0;
   double fSum = 0.0;

   FunctionParser Parser;
   Parser.AddConstant("pi", (double)M_PI);
   Parser.AddConstant("e", (double)M_E);

   if (Parser.Parse(sExpr.c_str(), "a,b,c,x,y,z,w") >= 0)
   {
      StopTimerAndReport(Parser.ErrorMsg());
      return m_fTime1;
   }
   else
   {
      double vals[] = {
                        1.1,
                        2.2,
                        3.3,
                        2.123456,
                        3.123456,
                        4.123456,
                        5.123456
                      };

      //Prime the I and D caches for the expression
      {
         double d0 = 0.0;
         double d1 = 0.0;

         for (std::size_t i = 0; i < priming_rounds; ++i)
         {
            if (i & 1)
               d0 += Parser.Eval(vals);
            else
               d1 += Parser.Eval(vals);
         }

         if (
               (d0 == std::numeric_limits<double>::infinity()) &&
               (d1 == std::numeric_limits<double>::infinity())
            )
         {
            printf("\n");
         }
      }

      fRes = Parser.Eval(vals);

      StartTimer();

      for (int j = 0; j < iCount; ++j)
      {
         fSum += Parser.Eval(vals);
         std::swap(vals[0], vals[1]);
         std::swap(vals[3], vals[4]);
      }

      StopTimer(fRes, fSum, iCount);
   }

   return m_fTime1;
}

void ribi::QtToolSurfacePlotterMainDialog::OnAnyChange()
{
  try { boost::lexical_cast<double>(ui->edit_minx->text().toStdString()); }
  catch (boost::bad_lexical_cast&)
  {
    this->setWindowTitle("Value of x_min is not a valid double"); return;
  }
  try { boost::lexical_cast<double>(ui->edit_miny->text().toStdString()); }
  catch (boost::bad_lexical_cast&)
  {
    this->setWindowTitle("Value of y_min is not a valid double"); return;
  }
  try { boost::lexical_cast<double>(ui->edit_maxx->text().toStdString()); }
  catch (boost::bad_lexical_cast&)
  {
    this->setWindowTitle("Value of x_max is not a valid double"); return;
  }
  try { boost::lexical_cast<double>(ui->edit_maxy->text().toStdString()); }
  catch (boost::bad_lexical_cast&)
  {
    this->setWindowTitle("Value of y_max is not a valid double"); return;
  }

  FunctionParser f;

  //Parse the formula
  f.Parse(ui->edit_equation->text().toStdString().c_str(),"x,y");
  if (f.GetParseErrorType()!= FunctionParser::FP_NO_ERROR)
  {
    this->setWindowTitle("Function cannot not be parsed"); return;
  }


  const double x_min = boost::lexical_cast<double>(ui->edit_minx->text().toStdString());
  const double y_min = boost::lexical_cast<double>(ui->edit_miny->text().toStdString());
  const double x_max = boost::lexical_cast<double>(ui->edit_maxx->text().toStdString());
  const double y_max = boost::lexical_cast<double>(ui->edit_maxy->text().toStdString());

  if (x_min >= x_max)
  {
    this->setWindowTitle("Value of x_min must be smaller than x_max"); return;
  }

  if (y_min >= y_max)
  {
    this->setWindowTitle("Value of y_min must be smaller than y_max"); return;
  }

  //Evaluate the function in a 2D std::vector
  const int n_rows = ui->surfaceplotwidget->height();
  const int n_cols = ui->surfaceplotwidget->width();
  std::vector<std::vector<double> > v(n_rows,std::vector<double>(n_cols,0.0));
  const double n_rows_d = static_cast<double>(n_rows);
  const double n_cols_d = static_cast<double>(n_cols);

  for (int y = 0; y!=n_rows; ++y)
  {
    const double yD = static_cast<double>(y);
    const double y_scaled = Rescale(yD,0.0,n_rows_d,y_min,y_max);
    for (int x = 0; x!=n_cols; ++x)
    {
      const double xD = static_cast<double>(x);
      const double x_scaled = Rescale(xD,0.0,n_cols_d,x_min,x_max);
      const double xs[2] = { x_scaled,y_scaled };
      const double z = f.Eval(xs);
      if (!f.EvalError())
      {
        v[y][x] = z;
      }
      else
      {
        v[y][x] = 0.0;
      }
    }
  }

  this->setWindowTitle("Function plotted successfully");

  //Plot the 2D std::vector
  ui->surfaceplotwidget->SetSurfaceGrey(v);
}

//.........这里部分代码省略.........
	int posP = 0;
	while (posP >= 0)
	{
// 		qDebug() << "#";
		posP = rxP.indexIn(ts, posP);
		if (posP >= 0)
		{
// 			qDebug() << rxP.cap(1);
// 			qDebug() << rxP.cap(2);
			QString replacement = QString("%1%2").arg(rxP.cap(1).toDouble()*(static_cast<double>(unitGetBaseFromIndex(SC_PICAS))) + rxP.cap(2).toDouble()).arg(CommonStrings::strPT);
			ts.replace(posP, rxP.cap(0).length(), replacement);
// 			qDebug() << ts;
		}
	}
// 	qDebug() << "##" << ts;
	
	ts.replace(",", ".");
	ts.replace("%", "");
	ts.replace("°", "");
	ts.replace(FinishTag, "");
	ts = ts.trimmed();

	if (ts.endsWith(su))
		ts = ts.left(ts.length()-su.length());
	int pos = ts.length();
	while (pos > 0)
	{
		pos = ts.lastIndexOf(".", pos);
		if (pos >= 0) 
		{
			if (pos < static_cast<int>(ts.length()))
			{
				if (!ts[pos+1].isDigit())
					ts.insert(pos+1, "0 ");
			}
			pos--;
		}
	}
	if (ts.endsWith("."))
		ts.append("0");
	//CB FParser doesn't handle unicode well/at all.
	//So, instead of just getting the translated strings and
	//sticking them in as variables in the parser, if they are
	//not the same as the untranslated version, then we replace them.
	//We lose the ability for now to have some strings in languages 
	//that might use them in variables.
	//To return to previous functionality, remove the follow replacement ifs,
	//S&R in the trStr* assignments trStrPT->strPT and remove the current str* ones. 
	//IE, send the translated strings through to the regexp.
	if (CommonStrings::trStrPT.localeAwareCompare(CommonStrings::strPT)!=0)
		ts.replace(CommonStrings::trStrPT, CommonStrings::strPT);
	if (CommonStrings::trStrMM.localeAwareCompare(CommonStrings::strMM)!=0)
		ts.replace(CommonStrings::trStrMM, CommonStrings::strMM);
	if (CommonStrings::trStrIN.localeAwareCompare(CommonStrings::strIN)!=0)
		ts.replace(CommonStrings::trStrIN, CommonStrings::strIN);
	if (CommonStrings::trStrCM.localeAwareCompare(CommonStrings::strCM)!=0)
		ts.replace(CommonStrings::trStrCM, CommonStrings::strCM);
	if (CommonStrings::trStrC.localeAwareCompare(CommonStrings::trStrC)!=0)
		ts.replace(CommonStrings::trStrC, CommonStrings::strC);
	//Replace in our typed text all of the units strings with *unitstring
	QRegExp rx("\\b(\\d+)\\s*("+CommonStrings::strPT+"|"+CommonStrings::strMM+"|"+CommonStrings::strC+"|"+CommonStrings::strCM+"|"+CommonStrings::strIN+")\\b");
	pos = 0;
	while (pos >= 0) {
		pos = rx.indexIn(ts, pos);
		if (pos >= 0) {
			QString replacement = rx.cap(1) + "*" + rx.cap(2);
			ts.replace(pos, rx.cap(0).length(), replacement);
		}
	}

	//Add in the fparser constants using our unit strings, and the conversion factors.
	FunctionParser fp;
// 	setFPConstants(fp);
	fp.AddConstant(CommonStrings::strPT.toStdString(), value2value(1.0, SC_PT, m_unitIndex));
	fp.AddConstant(CommonStrings::strMM.toStdString(), value2value(1.0, SC_MM, m_unitIndex));
	fp.AddConstant(CommonStrings::strIN.toStdString(), value2value(1.0, SC_IN, m_unitIndex));
	fp.AddConstant(CommonStrings::strP.toStdString(), value2value(1.0, SC_P, m_unitIndex));
	fp.AddConstant(CommonStrings::strCM.toStdString(), value2value(1.0, SC_CM, m_unitIndex));
	fp.AddConstant(CommonStrings::strC.toStdString(), value2value(1.0, SC_C, m_unitIndex));

	fp.AddConstant("old", value());
	if (m_constants)
	{
		QMap<QString, double>::ConstIterator itend = m_constants->constEnd();
		QMap<QString, double>::ConstIterator it = m_constants->constBegin();
		while(it != itend)
		{
			fp.AddConstant(it.key().toStdString(), it.value() * unitGetRatioFromIndex(m_unitIndex));
			++it;
		}
	}
	
	int ret = fp.Parse(ts.toStdString(), "", true);
//	qDebug() << "fp return =" << ret;
	if (ret >= 0)
		return 0;
	double erg = fp.Eval(NULL);
//	qDebug() << "fp value =" << erg;
	return erg;
}