lily/moment.cc

   1 /*
   2   moment.cc --  implement Moment
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10
  11 #include "lily-guile.hh"
  12 #include "moment.hh"
  13 #include "warn.hh"
  14 #include "ly-smobs.icc"
  15
  16 IMPLEMENT_SIMPLE_SMOBS (Moment);
  17 IMPLEMENT_TYPE_P (Moment, "ly:moment?");
  18
  19 SCM
  20 Moment::mark_smob (SCM)
  21 {
  22   return SCM_EOL;
  23 }
  24
  25
  26
  27
  28 int
  29 Moment::print_smob (SCM s, SCM port, scm_print_state *)
  30 {
  31   Moment  *r = (Moment *) ly_cdr (s);
  32
  33   scm_puts ("#<Mom ", port);
  34   String str = r->to_string ();
  35   scm_puts ((char *)str.to_str0 (), port);
  36   scm_puts (">", port);
  37
  38   return 1;
  39 }
  40
  41 /*
  42   TODO: add optional factor argument.
  43 */
  44 LY_DEFINE (make_moment,"ly:make-moment", 2,2,0, (SCM n, SCM d, SCM gn, SCM gd),
  45            "Create the rational number with main timing @var{n}/@var{d}, "
  46            "and optional grace timin @var{gn}/@var{gd}.\n"
  47            "\n"
  48            "\n"
  49            "Moment is a point in musical time. It is consists of a pair of\n"
  50            "rationals (@var{m},@var{g}), where @var{m} is the timing for the  main\n"
  51            "notes, and @var{g} the timing for  grace notes. In absence of grace\n"
  52            "notes, @var{g} is zero.\n"
  53            )
  54 {
  55   SCM_ASSERT_TYPE (SCM_INUMP (n), n, SCM_ARG1, __FUNCTION__, "integer");
  56   SCM_ASSERT_TYPE (SCM_INUMP (d), d, SCM_ARG2, __FUNCTION__, "integer");
  57
  58   int grace_num = 0;
  59   if (gn != SCM_UNDEFINED)
  60     {
  61       SCM_ASSERT_TYPE (SCM_INUMP (gn), gn, SCM_ARG3, __FUNCTION__, "integer");
  62       grace_num = gh_scm2int (gn);
  63     }
  64
  65   int grace_den = 1;
  66   if (gd != SCM_UNDEFINED)
  67     {
  68       SCM_ASSERT_TYPE (SCM_INUMP (gd), gd, SCM_ARG4, __FUNCTION__, "integer");
  69       grace_den = gh_scm2int (gd);
  70     }
  71
  72   return Moment (Rational (gh_scm2int (n), gh_scm2int (d)),
  73                  Rational (grace_num, grace_den)).smobbed_copy ();
  74 }
  75
  76 LY_DEFINE (add_moment,"ly:add-moment", 2,0,0, (SCM a, SCM b),
  77            "Add two moments."
  78            )
  79 {
  80   Moment * ma = unsmob_moment (a);
  81   Moment * mb = unsmob_moment (b);
  82   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
  83   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
  84
  85   return (*ma + *mb).smobbed_copy ();
  86 }
  87
  88
  89 LY_DEFINE (mul_moment,"ly:mul-moment", 2,0,0, (SCM a, SCM b),
  90            "Multiply two moments."
  91            )
  92 {
  93   Moment * ma = unsmob_moment (a);
  94   Moment * mb = unsmob_moment (b);
  95   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
  96   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
  97
  98   return (*ma *  *mb).smobbed_copy ();
  99 }
 100
 101
 102
 103 LY_DEFINE (div_moment,"ly:div-moment", 2,0,0, (SCM a, SCM b),
 104            "Divide two moments."
 105            )
 106 {
 107   Moment * ma = unsmob_moment (a);
 108   Moment * mb = unsmob_moment (b);
 109   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
 110   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
 111
 112   return (*ma /  *mb).smobbed_copy ();
 113 }
 114
 115 LY_DEFINE (ly_moment_less_p,"ly:moment<?", 2,0,0, (SCM a, SCM b),
 116            "Compare two moments.")
 117 {
 118   Moment * ma = unsmob_moment (a);
 119   Moment * mb = unsmob_moment (b);
 120   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
 121   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
 122
 123   return gh_bool2scm (*ma <  *mb);
 124 }
 125
 126
 127
 128 SCM
 129 Moment::equal_p (SCM a, SCM b)
 130 {
 131   Moment *m1 = unsmob_moment (a);
 132   Moment *m2 = unsmob_moment (b);
 133
 134   return (*m1 == *m2) ? SCM_BOOL_T : SCM_BOOL_F;
 135 }
 136
 137 /****************************************************************/
 138
 139 int
 140 compare (Moment const &a, Moment const &b)
 141 {
 142   return Moment::compare (a,b);
 143 }
 144
 145 int
 146 Moment::compare (Moment const &a, Moment const &b)
 147 {
 148   int c = Rational::compare (a.main_part_,b.main_part_);
 149   if (c)
 150     return c;
 151
 152   return Rational::compare (a.grace_part_, b.grace_part_);
 153 }
 154
 155 Moment::Moment ()
 156 {
 157
 158 }
 159
 160 Moment::Moment (int m)
 161 {
 162   main_part_ = Rational (m);
 163   grace_part_  = Rational ( 0);
 164 }
 165
 166 Moment::Moment (Rational m, Rational g)
 167 {
 168   main_part_ = m;
 169   grace_part_  = g;
 170 }
 171
 172 Moment::Moment (Rational m)
 173 {
 174   main_part_ = m;
 175   grace_part_  = Rational (0);
 176 }
 177
 178 void
 179 Moment::operator += (Moment const &src)
 180 {
 181   main_part_ +=src.main_part_ ;
 182   grace_part_ += src.grace_part_;
 183 }
 184 void
 185 Moment::operator -= (Moment const &src)
 186 {
 187   main_part_ -= src.main_part_ ;
 188   grace_part_ -= src.grace_part_;
 189 }
 190
 191 /*
 192   only take the main part of SRC for multiplication.
 193 */
 194 void
 195 Moment::operator *= (Moment const &src)
 196 {
 197   main_part_ *= src.main_part_ ;
 198   grace_part_ *= src.main_part_;
 199 }
 200
 201 /*
 202   only take the main part of SRC for multiplication.
 203 */
 204 void
 205 Moment::operator /= (Moment const &src)
 206 {
 207   main_part_ /= src.main_part_ ;
 208   grace_part_ /= src.main_part_;
 209 }
 210
 211
 212
 213 int
 214 Moment::den () const { return main_part_.den (); }
 215
 216 int
 217 Moment::num () const { return main_part_.num (); }
 218
 219 bool
 220 Moment::to_bool () const
 221 {
 222   return main_part_ || grace_part_;
 223 }
 224
 225 void
 226 Moment::set_infinite (int k)
 227 {
 228   main_part_.set_infinite (k);
 229 }
 230
 231
 232 String
 233 Moment::to_string () const
 234 {
 235   String s =  main_part_.to_string ();
 236   if (grace_part_)
 237     {
 238       s += "G" + grace_part_.to_string ();
 239     }
 240   return s;
 241 }
 242
 243 Moment
 244 Moment::operator - () const
 245 {
 246   Moment m;
 247   m.grace_part_ = - grace_part_;
 248   m. main_part_ = - main_part_ ;
 249   return m;
 250 }
 251
 252
 253 #ifdef STREAM_SUPPORT
 254 std::ostream &
 255 operator << (std::ostream &os, Moment const &m)
 256 {
 257   os << m.to_string ();
 258   return os;
 259 }
 260 #endif