2 moment.cc -- implement Moment bindings
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
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"
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")
24 SCM_ASSERT_TYPE (scm_is_integer (n), n, SCM_ARG1, __FUNCTION__, "integer");
25 SCM_ASSERT_TYPE (scm_is_integer (d), d, SCM_ARG2, __FUNCTION__, "integer");
28 if (gn != SCM_UNDEFINED)
30 SCM_ASSERT_TYPE (scm_is_integer (gn), gn, SCM_ARG3, __FUNCTION__, "integer");
31 grace_num = scm_to_int (gn);
35 if (gd != SCM_UNDEFINED)
37 SCM_ASSERT_TYPE (scm_is_integer (gd), gd, SCM_ARG4, __FUNCTION__, "integer");
38 grace_den = scm_to_int (gd);
41 return Moment (Rational (scm_to_int (n), scm_to_int (d)),
42 Rational (grace_num, grace_den)).smobbed_copy ();
45 LY_DEFINE (ly_add_moment, "ly:add-moment",
46 2, 0, 0, (SCM a, SCM b),
49 Moment *ma = unsmob_moment (a);
50 Moment *mb = unsmob_moment (b);
51 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
52 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
53 return (*ma + *mb).smobbed_copy ();
56 LY_DEFINE (ly_mul_moment, "ly:mul-moment",
57 2, 0, 0, (SCM a, SCM b),
58 "Multiply two moments.")
60 Moment *ma = unsmob_moment (a);
61 Moment *mb = unsmob_moment (b);
62 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
63 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
64 return (*ma * *mb).smobbed_copy ();
67 LY_DEFINE (ly_div_moment, "ly:div-moment",
68 2, 0, 0, (SCM a, SCM b),
69 "Divide two moments.")
71 Moment *ma = unsmob_moment (a);
72 Moment *mb = unsmob_moment (b);
73 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
74 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
75 return (*ma / *mb).smobbed_copy ();
78 LY_DEFINE (ly_moment_main_numerator, "ly:moment-main-numerator",
80 "Extract numerator from main timing.")
82 Moment *ma = unsmob_moment (mom);
83 SCM_ASSERT_TYPE (ma, mom, SCM_ARG1, __FUNCTION__, "moment");
85 return scm_from_int (ma->main_part_.numerator ());
88 LY_DEFINE (ly_moment_main_denominator, "ly:moment-main-denominator",
90 "Extract denominator from main timing.")
92 Moment *ma = unsmob_moment (mom);
93 SCM_ASSERT_TYPE (ma, mom, SCM_ARG1, __FUNCTION__, "moment");
95 return scm_from_int (ma->main_part_.denominator ());
98 LY_DEFINE (ly_moment_less_p, "ly:moment<?",
99 2, 0, 0, (SCM a, SCM b),
100 "Compare two moments.")
102 Moment *ma = unsmob_moment (a);
103 Moment *mb = unsmob_moment (b);
104 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
105 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
106 return ly_bool2scm (*ma < *mb);