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 #include "lily-guile.hh"
  10 #include "moment.hh"
  11 #include "warn.hh"
  12
  13
  14 Moment::Moment ()
  15 {
  16 }
  17
  18 Moment::Moment (int m)
  19 {
  20   main_part_ = Rational (m);
  21   grace_part_ = Rational ( 0);
  22 }
  23
  24 Moment::Moment (Rational m, Rational g)
  25 {
  26   main_part_ = m;
  27   grace_part_ = g;
  28 }
  29
  30 Moment::Moment (Rational m)
  31 {
  32   main_part_ = m;
  33   grace_part_ = Rational (0);
  34 }
  35
  36 #include "ly-smobs.icc"
  37 IMPLEMENT_SIMPLE_SMOBS (Moment);
  38 IMPLEMENT_TYPE_P (Moment, "ly:moment?");
  39
  40 SCM
  41 Moment::mark_smob (SCM)
  42 {
  43   return SCM_EOL;
  44 }
  45
  46 int
  47 Moment::print_smob (SCM s, SCM port, scm_print_state *)
  48 {
  49   Moment  *r = (Moment *) ly_cdr (s);
  50
  51   scm_puts ("#<Mom ", port);
  52   String str = r->to_string ();
  53   scm_puts ((char *)str.to_str0 (), port);
  54   scm_puts (">", port);
  55
  56   return 1;
  57 }
  58
  59 /* TODO: add optional factor argument. */
  60 LY_DEFINE (ly_make_moment, "ly:make-moment",
  61            2, 2, 0, (SCM n, SCM d, SCM gn, SCM gd),
  62            "Create the rational number with main timing @var{n}/@var{d}, "
  63            "and optional grace timin @var{gn}/@var{gd}.\n"
  64            "\n"
  65            "\n"
  66            "Moment is a point in musical time.  "
  67            "It is consists of a pair of rationals (@var{m},@var{g}), "
  68            "where @var{m} is the timing for the main\n"
  69            "notes, and @var{g} the timing for grace notes.  "
  70            "In absence of grace notes, @var{g} is zero.\n")
  71 {
  72   SCM_ASSERT_TYPE (SCM_INUMP (n), n, SCM_ARG1, __FUNCTION__, "integer");
  73   SCM_ASSERT_TYPE (SCM_INUMP (d), d, SCM_ARG2, __FUNCTION__, "integer");
  74
  75   int grace_num = 0;
  76   if (gn != SCM_UNDEFINED)
  77     {
  78       SCM_ASSERT_TYPE (SCM_INUMP (gn), gn, SCM_ARG3, __FUNCTION__, "integer");
  79       grace_num = ly_scm2int (gn);
  80     }
  81
  82   int grace_den = 1;
  83   if (gd != SCM_UNDEFINED)
  84     {
  85       SCM_ASSERT_TYPE (SCM_INUMP (gd), gd, SCM_ARG4, __FUNCTION__, "integer");
  86       grace_den = ly_scm2int (gd);
  87     }
  88
  89   return Moment (Rational (ly_scm2int (n), ly_scm2int (d)),
  90                  Rational (grace_num, grace_den)).smobbed_copy ();
  91 }
  92
  93 LY_DEFINE (ly_add_moment, "ly:add-moment",
  94            2, 0, 0, (SCM a, SCM b),
  95            "Add two moments.")
  96 {
  97   Moment *ma = unsmob_moment (a);
  98   Moment *mb = unsmob_moment (b);
  99   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
 100   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
 101   return (*ma + *mb).smobbed_copy ();
 102 }
 103
 104 LY_DEFINE (ly_mul_moment,"ly:mul-moment",
 105            2, 0, 0, (SCM a, SCM b),
 106            "Multiply two moments.")
 107 {
 108   Moment *ma = unsmob_moment (a);
 109   Moment *mb = unsmob_moment (b);
 110   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
 111   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
 112   return (*ma * *mb).smobbed_copy ();
 113 }
 114
 115 LY_DEFINE (ly_div_moment,"ly:div-moment",
 116            2, 0, 0, (SCM a, SCM b),
 117            "Divide two moments.")
 118 {
 119   Moment *ma = unsmob_moment (a);
 120   Moment *mb = unsmob_moment (b);
 121   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
 122   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
 123   return (*ma / *mb).smobbed_copy ();
 124 }
 125
 126 LY_DEFINE (ly_moment_less_p,"ly:moment<?",
 127            2, 0, 0, (SCM a, SCM b),
 128            "Compare two moments.")
 129 {
 130   Moment *ma = unsmob_moment (a);
 131   Moment *mb = unsmob_moment (b);
 132   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
 133   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
 134   return ly_bool2scm (*ma <  *mb);
 135 }
 136
 137 SCM
 138 Moment::equal_p (SCM a, SCM b)
 139 {
 140   Moment *m1 = unsmob_moment (a);
 141   Moment *m2 = unsmob_moment (b);
 142
 143   return (*m1 == *m2) ? SCM_BOOL_T : SCM_BOOL_F;
 144 }
 145
 146 /****************************************************************/
 147
 148 int
 149 compare (Moment const &a, Moment const &b)
 150 {
 151   return Moment::compare (a,b);
 152 }
 153
 154 int
 155 Moment::compare (Moment const &a, Moment const &b)
 156 {
 157   int c = Rational::compare (a.main_part_,b.main_part_);
 158   if (c)
 159     return c;
 160
 161   return Rational::compare (a.grace_part_, b.grace_part_);
 162 }
 163
 164 void
 165 Moment::operator += (Moment const &src)
 166 {
 167   main_part_ +=src.main_part_ ;
 168   grace_part_ += src.grace_part_;
 169 }
 170 void
 171 Moment::operator -= (Moment const &src)
 172 {
 173   main_part_ -= src.main_part_ ;
 174   grace_part_ -= src.grace_part_;
 175 }
 176
 177 /*
 178   only take the main part of SRC for multiplication.
 179 */
 180 void
 181 Moment::operator *= (Moment const &src)
 182 {
 183   main_part_ *= src.main_part_ ;
 184   grace_part_ *= src.main_part_;
 185 }
 186
 187 /*
 188   only take the main part of SRC for multiplication.
 189 */
 190 void
 191 Moment::operator /= (Moment const &src)
 192 {
 193   main_part_ /= src.main_part_ ;
 194   grace_part_ /= src.main_part_;
 195 }
 196
 197 int
 198 Moment::den () const
 199 {
 200   return main_part_.den ();
 201 }
 202
 203 int
 204 Moment::num () const
 205 {
 206   return main_part_.num ();
 207 }
 208
 209 bool
 210 Moment::to_bool () const
 211 {
 212   return main_part_ || grace_part_;
 213 }
 214
 215 void
 216 Moment::set_infinite (int k)
 217 {
 218   main_part_.set_infinite (k);
 219 }
 220
 221 String
 222 Moment::to_string () const
 223 {
 224   String s =  main_part_.to_string ();
 225   if (grace_part_)
 226     {
 227       s += "G" + grace_part_.to_string ();
 228     }
 229   return s;
 230 }
 231
 232 Moment
 233 Moment::operator - () const
 234 {
 235   Moment m;
 236   m.grace_part_ = - grace_part_;
 237   m. main_part_ = - main_part_ ;
 238   return m;
 239 }
 240
 241
 242 #ifdef STREAM_SUPPORT
 243 std::ostream &
 244 operator << (std::ostream &os, Moment const &m)
 245 {
 246   os << m.to_string ();
 247   return os;
 248 }
 249 #endif