params.h

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//Copyright (c) 2012, University of Cambridge
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#ifndef PARAMS_H_
#define PARAMS_H_

#include <limits.h>

namespace fst {

template<typename T, typename Collection>
struct AE {
  static void AddElement (Collection&, unsigned int, T);
};

template<typename T>
struct AE<T, std::vector<T> > {
  static void AddElement (std::vector<T>& params, unsigned int index, T param) {
    if (params.size() == index) {
      params.push_back (param);
    } else if (params.size() < index) {
      params.resize (index + 1, 0.0);
      params[index] = param;
    }
  }
};

template<typename T>
struct AE<T, std::map<unsigned int, T> > {
  static void AddElement (std::map<unsigned int, T>& params , unsigned int index
                          , T param) {
    params[index] = param;
  }
};

template<typename T, typename Collection >
Collection ParseParamString (const std::string& stringparams) {
  Collection result;
  std::stringstream strm (std::stringstream::in | std::stringstream::out);
  strm << stringparams << noskipws;
  char separator;
  unsigned int index = 0;
  while (strm.good() ) {
    T w;
    if (strm.peek() == '@') {
      w = 1.0;
      strm >> separator;
    } else {
      strm >> w;
      if (strm.eof() ) {
        separator = ' ';
      } else {
        strm >> separator;
      }
    }
    if (separator == '@') {
      strm >> index;
      if (!strm.eof() ) {
        strm >> separator;
      }
    }
    AE<T, Collection>::AddElement (result, index, w);
    ++index;
  }
  if (strm.fail() || strm.bad() ) {
    cerr << "ERROR: Unable to parse params: " << stringparams << endl;
    exit (1);
  }
  return result;
}

template<typename T>
struct ParamsInit {
  std::vector<T> params;

  ParamsInit() {
    std::string stringparams;
    char *paramsfile = getenv ("PARAMS_FILE");
    if (paramsfile) {
      ifstream ifs (paramsfile);
      if (!ifs.good() ) {
        cerr << "ERROR: unable to open file " << paramsfile << '\n';
        exit (1);
      }
      getline (ifs, stringparams);
    } else {
      char * pParams = getenv ("PARAMS");
      if (!pParams) {
        if (FLAGS_v > 0) {
          cerr
              << "Warning: cannot find parameter vector. Defaulting to flat parameters\n";
        }
        return;
      }
      stringparams = pParams;
    }
    params = ParseParamString<T, std::vector<T> > (stringparams);
    if (FLAGS_v > 0) {
      cerr << "Setting params to: ";
      for (typename std::vector<T>::const_iterator it = params.begin();
           it != params.end(); ++it) {
        cerr << *it << ", ";
      }
      cerr << endl;
    }
  }

};

}

#endif /* PARAMS_H_ */