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>
12 /* TODO: add optional factor argument. */
13 LY_DEFINE (ly_make_moment, "ly:make-moment",
14 2, 2, 0, (SCM n, SCM d, SCM gn, SCM gd),
15 "Create the rational number with main timing @var{n}/@var{d}, "
16 "and optional grace timin @var{gn}/@var{gd}.\n"
19 "Moment is a point in musical time. "
20 "It is consists of a pair of rationals (@var{m}, @var{g}), "
21 "where @var{m} is the timing for the main\n"
22 "notes, and @var{g} the timing for grace notes. "
23 "In absence of grace notes, @var{g} is zero.\n")
25 SCM_ASSERT_TYPE (scm_is_integer (n), n, SCM_ARG1, __FUNCTION__, "integer");
26 SCM_ASSERT_TYPE (scm_is_integer (d), d, SCM_ARG2, __FUNCTION__, "integer");
29 if (gn != SCM_UNDEFINED)
31 SCM_ASSERT_TYPE (scm_is_integer (gn), gn, SCM_ARG3, __FUNCTION__, "integer");
32 grace_num = scm_to_int (gn);
36 if (gd != SCM_UNDEFINED)
38 SCM_ASSERT_TYPE (scm_is_integer (gd), gd, SCM_ARG4, __FUNCTION__, "integer");
39 grace_den = scm_to_int (gd);
42 return Moment (Rational (scm_to_int (n), scm_to_int (d)),
43 Rational (grace_num, grace_den)).smobbed_copy ();
46 LY_DEFINE (ly_add_moment, "ly:add-moment",
47 2, 0, 0, (SCM a, SCM b),
50 Moment *ma = unsmob_moment (a);
51 Moment *mb = unsmob_moment (b);
52 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
53 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
54 return (*ma + *mb).smobbed_copy ();
57 LY_DEFINE (ly_mul_moment, "ly:mul-moment",
58 2, 0, 0, (SCM a, SCM b),
59 "Multiply two moments.")
61 Moment *ma = unsmob_moment (a);
62 Moment *mb = unsmob_moment (b);
63 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
64 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
65 return (*ma * *mb).smobbed_copy ();
68 LY_DEFINE (ly_div_moment, "ly:div-moment",
69 2, 0, 0, (SCM a, SCM b),
70 "Divide two moments.")
72 Moment *ma = unsmob_moment (a);
73 Moment *mb = unsmob_moment (b);
74 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
75 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
76 return (*ma / *mb).smobbed_copy ();
79 LY_DEFINE (ly_moment_main_numerator, "ly:moment-main-numerator",
81 "Extract numerator from main timing.")
83 Moment *ma = unsmob_moment (mom);
84 SCM_ASSERT_TYPE (ma, mom, SCM_ARG1, __FUNCTION__, "moment");
86 return scm_from_int (ma->main_part_.numerator ());
89 LY_DEFINE (ly_moment_main_denominator, "ly:moment-main-denominator",
91 "Extract denominator from main timing.")
93 Moment *ma = unsmob_moment (mom);
94 SCM_ASSERT_TYPE (ma, mom, SCM_ARG1, __FUNCTION__, "moment");
96 return scm_from_int (ma->main_part_.denominator ());
99 LY_DEFINE (ly_moment_less_p, "ly:moment<?",
100 2, 0, 0, (SCM a, SCM b),
101 "Compare two moments.")
103 Moment *ma = unsmob_moment (a);
104 Moment *mb = unsmob_moment (b);
105 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
106 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
107 return ly_bool2scm (*ma < *mb);