#include "input_par.h"
#include <cstdio>

using namespace std;

/***********************************************/
/* Create input_par: open the file for reading */
/* Throw a string if the file can't be open    */
/***********************************************/
input_par::input_par(char *name) : file_name_(name), line_no_(1)
{ if(!name || (name[0]==0))
  { throw ((string) "ERROR : blank file name for parameter file!");
  }
  par_file_.open(name);
  if(!par_file_.good())
  { throw ((string) "ERROR : Can't open parameter file "+name);
  }
}

/******************************************************/
/* Get the next paramater from the parameter file     */
/* Read one word then compare it to the Name supplied */
/* Read the double Value that follows and put it in v */
/* The line must be of the form:                      */
/*    Name  Value                                     */
/* Throw a string on error                            */
/******************************************************/
void input_par::get(char *Name,double &v)
{ 
  // Check that the parameter name is correct
  check_par_name(Name);

  // Read the value that follows : an int
  par_file_ >> v;
  
  // Increment the line no
  ++line_no_;
}

/******************************************************/
/* Get the next paramater from the parameter file     */
/* Read one word then compare it to the Name supplied */
/* Read the int Value that follows and put it in v    */
/* The line must be of the form:                      */
/*    Name  Value                                     */
/* Throw a string on error                            */
/******************************************************/
void input_par::get(char *Name,int &v)
{ 
  // Check that the parameter name is correct
  check_par_name(Name);

  // Read the value that follows : a double
  par_file_ >> v;
  
  // Increment the line no
  ++line_no_;
}

/******************************************************/
/* Get the next paramater from the parameter file     */
/* Read one word then compare it to the Name supplied */
/* Read the string Value that follows and put it in v */
/* No space is allowed in the string value!           */
/* The line must be of the form:                      */
/*    Name  Value                                     */
/* Throw a string on error                            */
/******************************************************/
void input_par::get(char *Name,char *v)
{ 
  // Check that the parameter name is correct
  check_par_name(Name);

  // Read the value that follows : a string
  par_file_ >> v;
  
  // Increment the line no
  ++line_no_;
}

/*******************************************************/
/* Check the paramater name:                           */
/* Read one word then compare it to the Name supplied  */
/* The line in the parameter file must be of the form: */
/*    Name  Value                                      */
/* Throw a string if the parameter Name does not match */
/*******************************************************/
void input_par::check_par_name(char *Name)
{ string s;
  char Buff[40];

  par_file_ >> s;

  // Check that the parameter name is correct
  if(s != Name)
  { sprintf(Buff,"%d",line_no_);
    throw ((string)"Error line "+Buff+" in parameter file "+file_name_+
        "\n  Line "+Buff+" : invalid parameter "+s+"  when expecting "+Name);
  }
}