flower/scalar.cc

   1 /*
   2   scalar.cc -- implement
   3
   4   source file of the Flower Library
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include <assert.h>
  10 #include <stdio.h>
  11 #include "scalar.hh"
  12
  13 Scalar::Scalar (Rational r)
  14   :String (r)
  15 {
  16
  17 }
  18
  19 Scalar::operator Rational ()
  20 {
  21   int p = index_i ('/');
  22   if (p == -1)
  23     return int (*this);
  24
  25   String s2 = right_str (len()-p-1);
  26   String s1 = left_str (p);
  27
  28   return Rational (s1.value_i (), s2.value_i ());
  29 }
  30
  31 bool
  32 Scalar::isnum_b () const
  33 {
  34   int conv = false;
  35   if (len ())
  36     {
  37       long l =0;
  38       conv = sscanf (strh_.ch_C (), "%ld", &l);
  39     }
  40   return len() && conv;
  41 }
  42
  43 Scalar::operator Real()
  44 {
  45   assert (isnum_b ());
  46   return value_f ();
  47 }
  48
  49 Scalar::operator int()
  50 {
  51   if (!length_i ())
  52     return 0;                   // ugh
  53
  54   assert (isnum_b());
  55   return value_i ();
  56 }
  57
  58
  59 Scalar::operator bool () const
  60 {
  61   if (!len ())
  62     return false;
  63   if (*this == "0")
  64     return false;
  65   String u (*this);
  66   if (u.upper_str () == "FALSE")
  67     return false;
  68   return true;
  69 }