ParseParameters.cpp

#include <iostream>
#include <cstdlib>
#include <iomanip>
#include "ParseParameters.h"
#include "Exceptions.h"

ParseParameters *ParseParameters::mInstance = NULL;

ParseParameters *ParseParameters::getInstance(void) {
  if (!mInstance)
    mInstance = new ParseParameters;
  return mInstance;
}

ParseParameters::ParseParameters() {
  // Valid parameters with their default values
  mDictionary["w0"] = 0.4;
  mDictionary["k"] = 0.2;
#ifdef USE_ORIGINAL_PROPORTIONS
  mDictionary["p0"] = 1.0;
  mDictionary["p1"] = 0.1;
#else
  mDictionary["p0"] = 0.25; // This way all the 4 proportions are equal to 0.25
  mDictionary["p1"] = 0.25;
#endif
  mDictionary["w2"] = 1.1;
}

void ParseParameters::addParameter(const char *aParamValuePair) {
  // Parse string in the format: name=value (or name:value)
  const char *p = aParamValuePair;
  size_t i = 0;
  for (; *p != '=' && *p != ':' && *p != '\0'; ++p, ++i) {
  }
  if (*p == '\0')
    throw FastCodeMLFatal("Added pair with missing value in addParameter");
  if (i == 0)
    throw FastCodeMLFatal("Added pair with missing param name in addParameter");

  // Extract the name part that should be present in the dictionary
  std::string name(aParamValuePair, i);
  if (mDictionary.count(name) < 1)
    throw FastCodeMLFatal("Try to add a non-existing key in addParameter");

  // Change the value corresponding to the parameter name
  mDictionary[name] = atof(p + 1);
}

double ParseParameters::getParameter(const char *aParamName) const {
  // The name should exist in the dictionary
  std::map<std::string, double>::const_iterator ip(
      mDictionary.find(aParamName));
  if (ip == mDictionary.end())
    throw FastCodeMLFatal("Invalid key requested in getParameter");

  // Return the corresponding value
  return ip->second;
}

std::ostream &operator<<(std::ostream &aOut,
                         const ParseParameters *aParamsList) {
  // Print the dictionary
  std::map<std::string, double>::const_iterator ip(
      aParamsList->mDictionary.begin());
  const std::map<std::string, double>::const_iterator end(
      aParamsList->mDictionary.end());
  for (; ip != end; ++ip) {
    aOut << std::setw(20) << ip->first << " = " << std::fixed
         << std::setprecision(6) << ip->second << std::endl;
  }

  return aOut;
}