read_parameter_file.C File Reference

#include <iostream>
#include <fstream>
#include <iomanip>
#include <cstdlib>
#include "roccom_c++.h"
#include "Rocin.h"

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Functions
void	eat_whitespace_until (std::string &str, const char &c, int start=0)
void	get_parameter_list (std::vector< std::pair< std::string, std::string > > &param_list, const char *file_name)

Function Documentation

void eat_whitespace_until	(	std::string &	str,
		const char &	c,
		int	start = 0
	)

Definition at line 149 of file read_parameter_file.C.

References i, and ni.

Referenced by get_parameter_list().

                                                                   {
  for(int i=start, ni=str.size(); i<ni&&str[i]!=c; ++i){
    if(str[i] == ' ' || str[i] == '\t'){
      str.erase(i,1);
      --i;
    }
  }
}

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void get_parameter_list	(	std::vector< std::pair< std::string, std::string > > &	param_list,
		const char *	file_name
	)

Definition at line 158 of file read_parameter_file.C.

References COM_assertion_msg, eat_whitespace_until(), and cimg_library::cimg::option().

Referenced by Rocin::read_parameter_file().

                                               {

  //open parameter file for input
  std::ifstream param_file(file_name);
  COM_assertion_msg(param_file,
                    "Specified parameter file not found.");

  string cur_line, option, value;
  string::size_type cur_pos;
  // get one line of the file at a time
  while (getline(param_file,cur_line)){

    cur_pos = cur_line.find('#');
    if(cur_pos != string::npos)
      cur_line.erase(cur_pos, cur_line.size()-cur_pos);

    // remove whitespace up to first '='
    eat_whitespace_until(cur_line, (char)61);

    // If the line only contained whitespace and comments,
    // go to the next line.
    if(cur_line.size()==0)
      continue;

    // Now find the first '='
    cur_pos = cur_line.find_first_of("=");
    COM_assertion_msg(cur_pos != string::npos  && cur_pos !=0,
                      (std::string("Parameter file '")
                       + file_name + "' has an invalid line.").c_str());

    option.assign(cur_line,0,cur_pos);
    value.assign(cur_line,cur_pos+1,string::npos);

    //eat all whitspace in the value up to the first '"'
    eat_whitespace_until(value, '"');

    //if the value has quotes, then make sure they are only at
    //beginning and ending of the string
    cur_pos = value.find('"');
    if(cur_pos != string::npos){
      COM_assertion_msg(cur_pos == 0,
                        "Parameter file has invalid value format");
      value.erase(0,1);
      cur_pos = value.rfind('"');
      // This should get rid of any whitespace after the last quotation mark
      eat_whitespace_until(value, '"', (int)cur_pos+1);
      COM_assertion_msg(cur_pos == value.size()-1,
                        "Parameter file has invalid value format");
      value.erase(cur_pos,1);
      COM_assertion_msg(value.find('"') == string::npos,
                        "Parameter file has invalid value format");
    }

    // quotations are never allowed in the option
    cur_pos = option.find_first_of("\"");
    COM_assertion_msg(cur_pos == string::npos,
                      "Unexpected quotation mark found in an option.");

    param_list.push_back(std::make_pair(option,value));
  }

}

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