2 moment.cc -- implement Moment
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
17 Moment::Moment (int m)
19 main_part_ = Rational (m);
20 grace_part_ = Rational ( 0);
23 Moment::Moment (Rational m, Rational g)
29 Moment::Moment (Rational m)
32 grace_part_ = Rational (0);
35 #include "ly-smobs.icc"
36 IMPLEMENT_SIMPLE_SMOBS (Moment);
37 IMPLEMENT_TYPE_P (Moment, "ly:moment?");
40 Moment::mark_smob (SCM)
46 Moment::print_smob (SCM s, SCM port, scm_print_state *)
48 Moment *r = (Moment *) SCM_CELL_WORD_1 (s);
50 scm_puts ("#<Mom ", port);
51 String str = r->to_string ();
52 scm_puts ((char *)str.to_str0 (), port);
59 Moment::as_scheme () const
61 return scm_list_5 (ly_symbol2scm ("ly:make-moment"),
62 scm_from_int (main_part_.num()),
63 scm_from_int (main_part_.den()),
64 scm_from_int (grace_part_.num()),
65 scm_from_int (grace_part_.den()));
68 /* TODO: add optional factor argument. */
69 LY_DEFINE (ly_make_moment, "ly:make-moment",
70 2, 2, 0, (SCM n, SCM d, SCM gn, SCM gd),
71 "Create the rational number with main timing @var{n}/@var{d}, "
72 "and optional grace timin @var{gn}/@var{gd}.\n"
75 "Moment is a point in musical time. "
76 "It is consists of a pair of rationals (@var{m},@var{g}), "
77 "where @var{m} is the timing for the main\n"
78 "notes, and @var{g} the timing for grace notes. "
79 "In absence of grace notes, @var{g} is zero.\n")
81 SCM_ASSERT_TYPE (scm_is_integer (n), n, SCM_ARG1, __FUNCTION__, "integer");
82 SCM_ASSERT_TYPE (scm_is_integer (d), d, SCM_ARG2, __FUNCTION__, "integer");
85 if (gn != SCM_UNDEFINED)
87 SCM_ASSERT_TYPE (scm_is_integer (gn), gn, SCM_ARG3, __FUNCTION__, "integer");
88 grace_num = scm_to_int (gn);
92 if (gd != SCM_UNDEFINED)
94 SCM_ASSERT_TYPE (scm_is_integer (gd), gd, SCM_ARG4, __FUNCTION__, "integer");
95 grace_den = scm_to_int (gd);
98 return Moment (Rational (scm_to_int (n), scm_to_int (d)),
99 Rational (grace_num, grace_den)).smobbed_copy ();
102 LY_DEFINE (ly_add_moment, "ly:add-moment",
103 2, 0, 0, (SCM a, SCM b),
106 Moment *ma = unsmob_moment (a);
107 Moment *mb = unsmob_moment (b);
108 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
109 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
110 return (*ma + *mb).smobbed_copy ();
113 LY_DEFINE (ly_mul_moment,"ly:mul-moment",
114 2, 0, 0, (SCM a, SCM b),
115 "Multiply two moments.")
117 Moment *ma = unsmob_moment (a);
118 Moment *mb = unsmob_moment (b);
119 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
120 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
121 return (*ma * *mb).smobbed_copy ();
124 LY_DEFINE (ly_div_moment,"ly:div-moment",
125 2, 0, 0, (SCM a, SCM b),
126 "Divide two moments.")
128 Moment *ma = unsmob_moment (a);
129 Moment *mb = unsmob_moment (b);
130 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
131 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
132 return (*ma / *mb).smobbed_copy ();
135 LY_DEFINE (ly_moment_less_p,"ly:moment<?",
136 2, 0, 0, (SCM a, SCM b),
137 "Compare two moments.")
139 Moment *ma = unsmob_moment (a);
140 Moment *mb = unsmob_moment (b);
141 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
142 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
143 return ly_bool2scm (*ma < *mb);
147 Moment::equal_p (SCM a, SCM b)
149 Moment *m1 = unsmob_moment (a);
150 Moment *m2 = unsmob_moment (b);
152 return (*m1 == *m2) ? SCM_BOOL_T : SCM_BOOL_F;
155 /****************************************************************/
158 compare (Moment const &a, Moment const &b)
160 return Moment::compare (a,b);
164 Moment::compare (Moment const &a, Moment const &b)
166 int c = Rational::compare (a.main_part_,b.main_part_);
170 return Rational::compare (a.grace_part_, b.grace_part_);
174 Moment::operator += (Moment const &src)
176 main_part_ +=src.main_part_ ;
177 grace_part_ += src.grace_part_;
180 Moment::operator -= (Moment const &src)
182 main_part_ -= src.main_part_ ;
183 grace_part_ -= src.grace_part_;
187 only take the main part of SRC for multiplication.
190 Moment::operator *= (Moment const &src)
192 main_part_ *= src.main_part_ ;
193 grace_part_ *= src.main_part_;
197 only take the main part of SRC for multiplication.
200 Moment::operator /= (Moment const &src)
202 main_part_ /= src.main_part_ ;
203 grace_part_ /= src.main_part_;
209 return main_part_.den ();
215 return main_part_.num ();
219 Moment::to_bool () const
221 return main_part_ || grace_part_;
225 Moment::set_infinite (int k)
227 main_part_.set_infinite (k);
231 Moment::to_string () const
233 String s = main_part_.to_string ();
236 s += "G" + grace_part_.to_string ();
242 Moment::operator - () const
245 m.grace_part_ = - grace_part_;
246 m. main_part_ = - main_part_ ;
251 #ifdef STREAM_SUPPORT
253 operator << (std::ostream &os, Moment const &m)
255 os << m.to_string ();
261 robust_scm2moment (SCM m, Moment d)
263 Moment *p = unsmob_moment (m);
272 moment_less (SCM a, SCM b)
274 return *unsmob_moment (a) < *unsmob_moment (b);