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IotrMatrixDisplayFormat.hh

#ifndef IOTRMATRIXDISPLAYFORMAT
#define IOTRMATRIXDISPLAYFORMAT

#include <iostream>
#include <cstring>

struct IotrMatrixDisplayFormat {
  IotrMatrixDisplayFormat( const char * str )
    : formatString( str ), displayAsFullMatrix(0) {}
  IotrMatrixDisplayFormat()
    : formatString( 0 ), displayAsFullMatrix(0) {}
  const char * formatString;
  char displayAsFullMatrix;
};


inline void 
iotr_display_matrix_elt( int i, int j, double d,
                         const IotrMatrixDisplayFormat & format,
                         const char * formatString,
                         std::ostream & out )
{
  if( d != 0 || format.displayAsFullMatrix ) {
    // This element is to be displayed
    int k = 0;
    char c;
    while( (c = formatString[k]) != 0 ) {
      // There are more characters in the format string
      if( c != '%' ) { // just echo the character
        out << c;
      } else { // this is the start of a format commant
        // Brain-dead variable substitution, but good enough for this
        // simple case
        if( 0 == strncmp( "{value}", &formatString[k + 1], 7 ) ) {
          out << d;
          k += 7;
        } else if ( 0 == strncmp( "{irow}", &formatString[k + 1], 6 ) ) {
          out << i;
          k += 6;
        } else if ( 0 == strncmp( "{jcol}", &formatString[k+1], 6) ) {
          out << j;
          k += 6;
        } else if ( 0 == strncmp( "{ifrow}", &formatString[k + 1], 7 ) ) {
          out << i + 1;
          k += 7;
        } else if ( 0 == strncmp( "{jfcol}", &formatString[k+1], 7) ) {
          out << j + 1;
          k += 7;
        } else {
          out << c;
        }
      } // end else this is the start of a format command
      k++;
    } // end while there are more characters in the format string
    out << std::endl;
  } // end if this element is to be displayed.
}


#endif

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