lily/moment-scheme.cc

   1 /*
   2   moment.cc -- implement Moment bindings
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "moment.hh"
  10
  11 /* TODO: add optional factor argument. */
  12 LY_DEFINE (ly_make_moment, "ly:make-moment",
  13            2, 2, 0, (SCM n, SCM d, SCM gn, SCM gd),
  14            "Create the rational number with main timing @var{n}/@var{d}, "
  15            "and optional grace timin @var{gn}/@var{gd}.\n"
  16            "\n"
  17            "\n"
  18            "Moment is a point in musical time.  "
  19            "It is consists of a pair of rationals (@var{m}, @var{g}), "
  20            "where @var{m} is the timing for the main\n"
  21            "notes, and @var{g} the timing for grace notes.  "
  22            "In absence of grace notes, @var{g} is zero.\n")
  23 {
  24   LY_ASSERT_TYPE (scm_is_integer, n, 1);
  25   LY_ASSERT_TYPE (scm_is_integer, d, 2);
  26
  27   int grace_num = 0;
  28   if (gn != SCM_UNDEFINED)
  29     {
  30       LY_ASSERT_TYPE (scm_is_integer, gn, 3);
  31       grace_num = scm_to_int (gn);
  32     }
  33
  34   int grace_den = 1;
  35   if (gd != SCM_UNDEFINED)
  36     {
  37       LY_ASSERT_TYPE (scm_is_integer, gd, 4);
  38       grace_den = scm_to_int (gd);
  39     }
  40
  41   return Moment (Rational (scm_to_int (n), scm_to_int (d)),
  42                  Rational (grace_num, grace_den)).smobbed_copy ();
  43 }
  44
  45 LY_DEFINE (ly_moment_sub, "ly:moment-sub",
  46            2, 0, 0, (SCM a, SCM b),
  47            "Subtract two moments.")
  48 {
  49   LY_ASSERT_SMOB (Moment, a, 1);
  50   LY_ASSERT_SMOB (Moment, b, 2);
  51
  52   Moment *ma = unsmob_moment (a);
  53   Moment *mb = unsmob_moment (b);
  54
  55   return (*ma - *mb).smobbed_copy ();
  56 }
  57
  58 LY_DEFINE (ly_moment_add, "ly:moment-add",
  59            2, 0, 0, (SCM a, SCM b),
  60            "Add two moments.")
  61 {
  62   LY_ASSERT_SMOB (Moment, a, 1);
  63   LY_ASSERT_SMOB (Moment, b, 2);
  64
  65   Moment *ma = unsmob_moment (a);
  66   Moment *mb = unsmob_moment (b);
  67
  68   return (*ma + *mb).smobbed_copy ();
  69 }
  70
  71 LY_DEFINE (ly_moment_mul, "ly:moment-mul",
  72            2, 0, 0, (SCM a, SCM b),
  73            "Multiply two moments.")
  74 {
  75   LY_ASSERT_SMOB (Moment, a, 1);
  76   LY_ASSERT_SMOB (Moment, b, 2);
  77
  78   Moment *ma = unsmob_moment (a);
  79   Moment *mb = unsmob_moment (b);
  80   return (*ma * * mb).smobbed_copy ();
  81 }
  82
  83 LY_DEFINE (ly_moment_div, "ly:moment-div",
  84            2, 0, 0, (SCM a, SCM b),
  85            "Divide two moments.")
  86 {
  87   LY_ASSERT_SMOB (Moment, a, 1);
  88   LY_ASSERT_SMOB (Moment, b, 2);
  89
  90   Moment *ma = unsmob_moment (a);
  91   Moment *mb = unsmob_moment (b);
  92
  93   return (*ma / * mb).smobbed_copy ();
  94 }
  95
  96 LY_DEFINE (ly_moment_mod, "ly:moment-mod",
  97            2, 0, 0, (SCM a, SCM b),
  98            "Modulo of two moments.")
  99 {
 100   LY_ASSERT_SMOB (Moment, a, 1);
 101   LY_ASSERT_SMOB (Moment, b, 2);
 102
 103   Moment *ma = unsmob_moment (a);
 104   Moment *mb = unsmob_moment (b);
 105   return (*ma % * mb).smobbed_copy ();
 106 }
 107
 108 LY_DEFINE (ly_moment_grace_numerator, "ly:moment-grace-numerator",
 109            1, 0, 0, (SCM mom),
 110            "Extract numerator from grace timing.")
 111 {
 112   LY_ASSERT_SMOB (Moment, mom, 1);
 113
 114   Moment *ma = unsmob_moment (mom);
 115
 116   return scm_from_int (ma->grace_part_.numerator ());
 117 }
 118
 119 LY_DEFINE (ly_moment_grace_denominator, "ly:moment-grace-denominator",
 120            1, 0, 0, (SCM mom),
 121            "Extract denominator from grace timing.")
 122 {
 123   LY_ASSERT_SMOB (Moment, mom, 1);
 124   Moment *ma = unsmob_moment (mom);
 125
 126   return scm_from_int (ma->grace_part_.denominator ());
 127 }
 128 LY_DEFINE (ly_moment_main_numerator, "ly:moment-main-numerator",
 129            1, 0, 0, (SCM mom),
 130            "Extract numerator from main timing.")
 131 {
 132   LY_ASSERT_SMOB (Moment, mom, 1);
 133   Moment *ma = unsmob_moment (mom);
 134
 135   return scm_from_int (ma->main_part_.numerator ());
 136 }
 137
 138 LY_DEFINE (ly_moment_main_denominator, "ly:moment-main-denominator",
 139            1, 0, 0, (SCM mom),
 140            "Extract denominator from main timing.")
 141 {
 142   LY_ASSERT_SMOB (Moment, mom, 1);
 143   Moment *ma = unsmob_moment (mom);
 144
 145   return scm_from_int (ma->main_part_.denominator ());
 146 }
 147
 148 LY_DEFINE (ly_moment_less_p, "ly:moment<?",
 149            2, 0, 0, (SCM a, SCM b),
 150            "Compare two moments.")
 151 {
 152   LY_ASSERT_SMOB (Moment, a, 1);
 153   LY_ASSERT_SMOB (Moment, b, 2);
 154
 155   Moment *ma = unsmob_moment (a);
 156   Moment *mb = unsmob_moment (b);
 157
 158   return ly_bool2scm (*ma < *mb);
 159 }
 160