flower/scalar.cc

   1 /*
   2   scalar.cc -- implement Scalar
   3
   4   source file of the Flower Library
   5
   6   (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include <assert.h>
  10 #include <stdio.h>
  11 #include "scalar.hh"
  12 #include "rational.hh"
  13 #include "matrix.hh"
  14
  15 Scalar::Scalar (Rational r)
  16 {
  17   (*this) = r.str ();
  18 }
  19
  20 Scalar::operator Rational ()
  21 {
  22   return to_rat ();
  23 }
  24
  25 Rational
  26 Scalar::to_rat () const
  27 {
  28   int p = index_i ('/');
  29   if (p == -1)
  30     return this->to_i ();
  31
  32   String s2 = right_str (length_i ()-p-1);
  33   String s1 = left_str (p);
  34
  35   return Rational (s1.value_i (), s2.value_i ());
  36 }
  37
  38 bool
  39 Scalar::isnum_b () const
  40 {
  41   int conv = false;
  42   if (length_i ())
  43     {
  44       long l =0;
  45       conv = sscanf (strh_.ch_C (), "%ld", &l);
  46     }
  47   return length_i () && conv;
  48 }
  49
  50 Scalar::operator Real()
  51 {
  52   return to_f ();
  53 }
  54
  55 Real
  56 Scalar::to_f () const
  57 {
  58   assert (isnum_b ());
  59   return value_f ();
  60 }
  61
  62 Scalar::operator int ()
  63 {
  64   return to_i ();
  65 }
  66
  67 int
  68 Scalar::to_i () const
  69 {
  70   if (!length_i ())
  71     return 0;                   // ugh
  72
  73   assert (isnum_b());
  74   return value_i ();
  75 }
  76
  77 Scalar::operator bool () const
  78 {
  79   return to_bool ();
  80 }
  81
  82 bool
  83 Scalar::to_bool () const
  84 {
  85   if (!length_i ())
  86     return false;
  87   if (*this == "0")
  88     return false;
  89   String u (*this);
  90   if (u.upper_str () == "FALSE")
  91     return false;
  92   return true;
  93 }
  94
  95 Scalar::Scalar(Matrix const &m)
  96 {
  97   *this = m.str ();
  98 }
  99
 100 Scalar::Scalar (Vector const &v)
 101 {
 102   *this = v.str ();
 103 }