def prettify_rewrite_meter(
selection: abjad.Selection,
meter: Union[abjad.Meter, abjad.TimeSignature],
*,
fuse_across_groups_of_beats: bool = True,
fuse_quadruple_meter: bool = True,
fuse_triple_meter: bool = True,
extract_trivial_tuplets: bool = True,
split_quadruple_meter: bool = True,
) -> None:
r"""Mutates an input |abjad.Selection| in place and has no return value;
this function fuses pitched leaves according to the rules shown below,
improving the default output of |abjad.mutate().rewrite_meter()|.
Basic usage:
Meters whose denominators are a crotchet or longer get tied notes
within a beat after |abjad.mutate().rewrite_meter()| when they are at
an offset ``denominator / 4``, so a rhythm such as ``denominator / 4``
``denominator / 2`` ``denominator / 4`` becomes ``denominator / 4``
``denominator / 4`` ``~`` ``denominator / 4`` ``denominator / 4``. This
function looks for those specific cases and fuses them, generating an
output which is often more readable.
>>> staff = abjad.Staff(
... r"\time 3/4 c'16 d'8 e'16 f'16 g'16 a'8 b'8 c''16 d''16"
... )
>>> meter = abjad.Meter((3, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 3/4
c'16
d'16
~
d'16
e'16
f'16
g'16
a'8
b'8
c''16
d''16
}
.. figure:: ../_images/prettify_rewrite_meter-vlnd7l5fb7s.png
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 3/4
c'16
d'8
e'16
f'16
g'16
a'8
b'8
c''16
d''16
}
.. figure:: ../_images/prettify_rewrite_meter-e7vfnese0ut.png
.. note::
Auxjad automatically adds this function as an extension method to
|abjad.mutate()|. It can thus be used from either
:func:`auxjad.mutate()` or |abjad.mutate()|. Therefore, the two lines
below are equivalent:
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.mutate(staff[:]).prettify_rewrite_meter(meter)
Other examples:
The rhythm of the leaves just before and after the two leaves to be
fused can be different than ``denominator / 4``, as the function
searches for logical ties of specific length and offset, and its
surroundings do not matter.
>>> staff = abjad.Staff(r"\time 3/4 c'32 d'32 e'8 f'16 "
... r"\times 2/3 {g'32 a'32 b'32} c''8 "
... r"r16 r32. d''64 e''8 f''32 g''32"
... )
>>> meter = abjad.Meter((3, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 3/4
c'32
d'32
e'16
~
e'16
f'16
\times 2/3 {
g'32
a'32
b'32
}
c''16
~
c''16
r16
r32.
d''64
e''16
~
e''16
f''32
g''32
}
.. figure:: ../_images/prettify_rewrite_meter-kw09gse2zxj.png
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 3/4
c'32
d'32
e'8
f'16
\times 2/3 {
g'32
a'32
b'32
}
c''8
r16
r32.
d''64
e''8
f''32
g''32
}
.. figure:: ../_images/prettify_rewrite_meter-u5gmtdippsa.png
``fuse_across_groups_of_beats``:
By default, this function also fuses rhythms of type
``denominator / 2`` ``denominator / 2`` ``~`` ``denominator / 2``
``denominator / 2``, becoming ``denominator / 2`` ``denominator``
``denominator / 2``. This is only applied when the meter's structure
has a depth of 2, which is the case for meters with numerators equal to
or larger than ``5``.
>>> staff = abjad.Staff(r"\time 6/4 c'8 d'4 e'4 f'4 g'4 a'4 b'8")
>>> meter = abjad.Meter((6, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 6/4
c'8
d'8
~
d'8
e'8
~
e'8
f'8
~
f'8
g'8
~
g'8
a'8
~
a'8
b'8
}
.. figure:: ../_images/prettify_rewrite_meter-tqi4p0u8qog.png
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 6/4
c'8
d'4
e'4
f'8
~
f'8
g'4
a'4
b'8
}
.. figure:: ../_images/prettify_rewrite_meter-riif1glyqpo.png
to disable this behaviour, set the optional keyword argument
``fuse_across_groups_of_beats`` to ``False``.
>>> staff = abjad.Staff(r"\time 6/4 c'8 d'4 e'4 f'4 g'4 a'4 b'8")
>>> meter = abjad.Meter((6, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(
... meter,
... fuse_across_groups_of_beats=False,
... )
>>> abjad.f(staff)
\new Staff
{
\time 6/4
c'8
d'8
~
d'8
e'8
~
e'8
f'8
~
f'8
g'8
~
g'8
a'8
~
a'8
b'8
}
.. figure:: ../_images/prettify_rewrite_meter-ki5xbiteij.png
|abjad.Meter| with ``increase_monotonic=True``:
The fused notes will respect the beat structures of such meters, even
when ``increase_monotonic`` is set to the non-default value ``True``.
Compare the outputs below.
>>> staff = abjad.Staff(r"\time 7/4 c'8 d'4 e'4 f'4 g'4 a'4 b'4 c''8")
>>> meter = abjad.Meter((7, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 7/4
c'8
d'4
e'4
f'8
~
f'8
g'4
a'8
~
a'8
b'4
c''8
}
.. figure:: ../_images/prettify_rewrite_meter-bud0jhkvvl.png
>>> staff = abjad.Staff(r"\time 7/4 c'8 d'4 e'4 f'4 g'4 a'4 b'4 c''8")
>>> meter = abjad.Meter((7, 4), increase_monotonic=True)
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 7/4
c'8
d'4
e'8
~
e'8
f'4
g'8
~
g'8
a'4
b'4
c''8
}
.. figure:: ../_images/prettify_rewrite_meter-47y86pbwwv5.png
Multiple measures at once:
This function can take handle multiple measures at once, as long as
they share the same meter.
>>> staff = abjad.Staff(r"\time 5/8 c'16 d'8 e'8 f'8 g'8 a'16 ~ "
... r"a'16 b'8 c''8 d''8 e''8 f''16"
... )
>>> meter = abjad.Meter((5, 8))
>>> for measure in abjad.select(staff[:]).group_by_measure():
... abjad.mutate(staff[:]).rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 5/8
c'16
d'16
~
d'16
e'16
~
e'16
f'16
~
f'16
g'16
~
g'16
a'16
~
a'16
b'16
~
b'16
c''16
~
c''16
d''16
~
d''16
e''16
~
e''16
f''16
}
.. figure:: ../_images/prettify_rewrite_meter-8jdzmvf9yl.png
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 5/8
c'16
d'8
e'8
f'16
~
f'16
g'8
a'16
~
a'16
b'8
c''8
d''16
~
d''16
e''8
f''16
}
.. figure:: ../_images/prettify_rewrite_meter-pcn8x9hr6bb.png
Multiple measures:
Similarly to |abjad.mutate().rewrite_meter()|, this function accepts
selections of multiple measures:
>>> staff = abjad.Staff(r"\time 4/4 c'8 d'4 e'4 f'4 g'8 | "
... r"a'8 b'4 c''8 d''16 e''4 f''8.")
>>> meter = abjad.Meter((4, 4))
>>> for measure in abjad.select(staff[:]).group_by_measure():
... abjad.mutate(measure).rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 4/4
c'8
d'8
~
d'8
e'8
~
e'8
f'8
~
f'8
g'8
a'8
b'8
~
b'8
c''8
d''16
e''8.
~
e''16
f''8.
}
.. figure:: ../_images/prettify_rewrite_meter-s8fg7a2k0tr.png
>>> for measure in abjad.select(staff[:]).group_by_measure():
... auxjad.mutate(measure).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 4/4
c'8
d'4
e'8
~
e'8
f'4
g'8
a'8
b'4
c''8
d''16
e''8.
~
e''16
f''8.
}
.. figure:: ../_images/prettify_rewrite_meter-rgd7ok7fkq.png
Multiple measures with different meters:
If the measures have different meters, they can be passed on
individually using :func:`zip()` as shown below.
>>> staff = abjad.Staff(r"\time 3/4 c'8 d'4 e'4 f'16 g'16 | "
... r"\time 4/4 a'8 b'4 c''8 d''16 e''4 f''8.")
>>> meters = [abjad.Meter((3, 4)), abjad.Meter((4, 4))]
>>> for meter, measure in zip(
... meters,
... abjad.select(staff[:]).group_by_measure(),
... ):
... abjad.mutate(measure).rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 3/4
c'8
d'8
~
d'8
e'8
~
e'8
f'16
g'16
\time 4/4
a'8
b'8
~
b'8
c''8
d''16
e''8.
~
e''16
f''8.
}
.. figure:: ../_images/prettify_rewrite_meter-o2izz0m7s9k.png
>>> for meter, measure in zip(
... meters,
... abjad.select(staff[:]).group_by_measure(),
... ):
... auxjad.mutate(measure).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 3/4
c'8
d'4
e'4
f'16
g'16
\time 4/4
a'8
b'4
c''8
d''16
e''8.
~
e''16
f''8.
}
.. figure:: ../_images/prettify_rewrite_meter-zh89kk66zon.png
``fuse_quadruple_meter``:
This function also takes care of two special cases, namely quadruple
and triple meters. By default, it will fuse leaves in quadruple meters
across beats 1 and 2, and across beats 3 and 4 (as long as they fulfil
the other requirements of duration and offset).
>>> staff = abjad.Staff(r"\time 4/4 c'8 d'4 e'4 f'4 g'8")
>>> meter = abjad.Meter((4, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 4/4
c'8
d'4
e'8
~
e'8
f'4
g'8
}
.. figure:: ../_images/prettify_rewrite_meter-nap4bbf7mxe.png
Set ``fuse_quadruple_meter`` to ``False`` to disable this behaviour.
>>> staff = abjad.Staff(r"\time 4/4 c'8 d'4 e'4 f'4 g'8")
>>> meter = abjad.Meter((4, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(
... meter,
... fuse_quadruple_meter=False,
... )
>>> abjad.f(staff)
\new Staff
{
\time 4/4
c'8
d'8
~
d'8
e'8
~
e'8
f'8
~
f'8
g'8
}
.. figure:: ../_images/prettify_rewrite_meter-juipg9nzna.png
``fuse_triple_meter``:
In the case of triple meters, it will fuse leaves across any beat as
long as the previously mentioned conditions of offset and duration are
met.
>>> staff = abjad.Staff(r"\time 3/4 c'8 d'4 e'4 f'8")
>>> meter = abjad.Meter((3, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
\time 3/4
c'8
d'4
e'4
f'8
}
.. figure:: ../_images/prettify_rewrite_meter-4wg3grpb94p.png
Similarly to the example before, set ``fuse_triple_meter`` to ``False``
to disable this behaviour.
>>> staff = abjad.Staff(r"\time 3/4 c'8 d'4 e'4 f'8")
>>> meter = abjad.Meter((3, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> auxjad.mutate(staff[:]).prettify_rewrite_meter(
... meter,
... fuse_triple_meter=False,
... )
>>> abjad.f(staff)
\new Staff
{
\time 3/4
c'8
d'8
~
d'8
e'8
~
e'8
f'8
}
.. figure:: ../_images/prettify_rewrite_meter-l16ostzscta.png
``extract_trivial_tuplets``:
By default, this function extracts the contents of tuples that consist
solely of rests, or solely of tied notes and chords.
>>> staff = abjad.Staff(
... r"\times 2/3 {c'4 ~ c'8} \times 2/3 {d'8 r4} "
... r"\times 2/3 {r8 r8 r8} \times 2/3 {<e' g'>8 ~ <e' g'>4}"
... )
>>> meter = abjad.Meter((4, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> abjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
c'4
\times 2/3 {
d'8
r4
}
r4
<e' g'>4
}
.. figure:: ../_images/prettify_rewrite_meter-a72jx4fc1xd.png
Set ``extract_trivial_tuplets`` to ``False`` to disable this behaviour.
>>> staff = abjad.Staff(
... r"\times 2/3 {c'4 ~ c'8} \times 2/3 {d'8 r4} "
... r"\times 2/3 {r8 r8 r8} \times 2/3 {<e' g'>8 ~ <e' g'>4}"
... )
>>> meter = abjad.Meter((4, 4))
>>> abjad.mutate(staff[:]).rewrite_meter(meter)
>>> abjad.mutate(staff[:]).prettify_rewrite_meter(
... meter,
... extract_trivial_tuplets=False,
... )
>>> abjad.f(staff)
\new Staff
{
\times 2/3 {
c'4.
}
\times 2/3 {
d'8
r4
}
\times 2/3 {
r4.
}
\times 2/3 {
<e' g'>4.
}
}
.. figure:: ../_images/prettify_rewrite_meter-v9q0ka94qcd.png
``split_quadruple_meter``
When applying |abjad.mutate().rewrite_meter()| to a selection with
quadruple meter and without using a deeper ``boundary_depth`` than the
default, the resulting notation will often have leaves crossing the
third beat of the measure, as shown below.
>>> staff = abjad.Staff(
... r"c'4 d'2 r4"
... r"e'4. f'2 g'8"
... r"a'4. b'4. c''4"
... r"d''16 e''8. f''4. g''4 a''8"
... )
>>> meter = abjad.Meter((4, 4))
>>> for measure in abjad.select(staff[:]).group_by_measure():
... abjad.mutate(measure).rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
c'4
d'2
r4
e'4.
f'8
~
f'4.
g'8
a'4.
b'4.
c''4
d''16
e''8.
f''4.
g''8
~
g''8
a''8
}
.. figure:: ../_images/prettify_rewrite_meter-1wvhrjife1i.png
This function tests those leaves against a series of rules, splitting
them when the tests fails. In the case shown above, the first two bars
are very easy to read rhythmically, but the third and fourth are less
so. This is due to the dotted crotchet, which starts off a beat,
crossing the third beat of the measure. This function will split these
sort of leaves as shown below.
>>> abjad.mutate(staff[:]).prettify_rewrite_meter(meter)
>>> abjad.f(staff)
\new Staff
{
c'4
d'2
r4
e'4.
f'8
~
f'4.
g'8
a'4.
b'8
~
b'4
c''4
d''16
e''8.
f''4
~
f''8
g''4
a''8
}
.. figure:: ../_images/prettify_rewrite_meter-56dy04wjzg.png
Set ``split_quadruple_meter`` to ``False`` to disable this behaviour.
>>> staff = abjad.Staff(
... r"c'4 d'2 r4"
... r"e'4. f'2 g'8"
... r"a'4. b'4. c''4"
... r"d''16 e''8. f''4. g''4 a''8"
... )
>>> meter = abjad.Meter((4, 4))
>>> for measure in abjad.select(staff[:]).group_by_measure():
... abjad.mutate(measure).rewrite_meter(meter)
>>> abjad.mutate(staff[:]).prettify_rewrite_meter(
... meter,
... split_quadruple_meter=False,
... )
>>> abjad.f(staff)
\new Staff
{
c'4
d'2
r4
e'4.
f'8
~
f'4.
g'8
a'4.
b'4.
c''4
d''16
e''8.
f''4.
g''4
a''8
}
.. figure:: ../_images/prettify_rewrite_meter-ww1x0zsxlnd.png
.. tip::
Use :func:`auxjad.auto_rewrite_meter()` to automatically apply
|abjad.mutate().rewrite_meter()| and
|auxjad.mutate().prettify_rewrite_meter()| to a container with multiple
time signatures.
.. warning::
The input selection must be a contiguous logical voice. When dealing
with a container with multiple subcontainers (e.g. a score containing
multiple staves), the best approach is to cycle through these
subcontainers, applying this function to them individually.
"""
if not isinstance(selection, abjad.Selection):
raise TypeError("first argument must be 'abjad.Selection'")
if not selection.leaves().are_contiguous_logical_voice():
raise ValueError("first argument must be contiguous logical voice")
if not isinstance(meter, (abjad.Meter, abjad.TimeSignature)):
raise TypeError("argument must be 'abjad.Meter' or "
"'abjad.TimeSignature'")
if not isinstance(fuse_across_groups_of_beats, bool):
raise TypeError("'fuse_across_groups_of_beats' must be 'bool'")
if not isinstance(fuse_quadruple_meter, bool):
raise TypeError("'fuse_quadruple_meter' must be 'bool'")
if not isinstance(fuse_triple_meter, bool):
raise TypeError("'fuse_triple_meter' must be 'bool'")
if not isinstance(extract_trivial_tuplets, bool):
raise TypeError("'extract_trivial_tuplets' must be 'bool'")
if not isinstance(split_quadruple_meter, bool):
raise TypeError("'split_quadruple_meter' must be 'bool'")
if isinstance(meter, abjad.TimeSignature):
meter = abjad.Meter(meter.pair)
logical_ties = selection.logical_ties(pitched=True)
if len(logical_ties) == 0:
return
first_leaf = selection.leaf(0)
initial_offset = abjad.inspect(first_leaf).timespan().start_offset
base = 1 / meter.denominator
def _merge_indicators_then_fuse(logical_tie):
last_indicators = abjad.inspect(logical_tie[-1]).indicators()
initial_indicators = abjad.inspect(logical_tie[0]).indicators()
initial_indicators_types = tuple(
type(indicator) for indicator in initial_indicators)
abjad.mutate(logical_tie).fuse()
for indicator in last_indicators:
if isinstance(indicator, (
abjad.Dynamic,
abjad.StopSlur,
abjad.StopGroup,
abjad.StopHairpin,
abjad.StopTextSpan,
abjad.StopTrillSpan,
abjad.StopPianoPedal,
abjad.StopPhrasingSlur,
)):
if not isinstance(indicator, initial_indicators_types):
abjad.attach(indicator, logical_tie[0])
for logical_tie in logical_ties.filter_duration("==", base / 2):
offset = abjad.inspect(logical_tie).timespan().start_offset
offset -= initial_offset
offset %= base
if offset == base / 4:
_merge_indicators_then_fuse(logical_tie)
if fuse_across_groups_of_beats:
for logical_tie in logical_ties.filter_duration("==", base):
offset = abjad.inspect(logical_tie).timespan().start_offset
offset -= initial_offset
offset %= meter.duration
offset_mod = offset % base
if offset_mod == base / 2:
if (not offset + base / 2
in meter.depthwise_offset_inventory[1]):
_merge_indicators_then_fuse(logical_tie)
if fuse_quadruple_meter and meter.numerator == 4:
for logical_tie in logical_ties.filter_duration("==", base):
offset = abjad.inspect(logical_tie).timespan().start_offset
offset -= initial_offset
offset %= meter.duration
offset_mod = offset % base
if offset_mod == base / 2:
if not offset + base / 2 in (
abjad.Offset(0, 1),
abjad.Offset(2 * base),
abjad.Offset(4 * base),
):
_merge_indicators_then_fuse(logical_tie)
if fuse_triple_meter and meter.numerator == 3:
for logical_tie in logical_ties.filter_duration("==", base):
offset = abjad.inspect(logical_tie).timespan().start_offset
offset -= initial_offset
offset %= meter.duration
offset_mod = offset % base
if offset_mod == base / 2:
if not offset + base / 2 in (
abjad.Offset(0, 1),
abjad.Offset(3 * base),
):
_merge_indicators_then_fuse(logical_tie)
logical_ties = selection.logical_ties() # splitting not only pitched
if split_quadruple_meter and meter.numerator == 4:
half_point_offset = abjad.Offset(2 * base)
for logical_tie in logical_ties:
offset0 = abjad.inspect(logical_tie).timespan().start_offset
offset0 -= initial_offset
offset0 %= meter.duration
if offset0 == abjad.Offset(0, 1):
# do not split things like c'1, c'2.. r8, c'2. r4, etc.
continue
offset1 = abjad.inspect(logical_tie).timespan().stop_offset
offset1 -= initial_offset
offset1 %= meter.duration
if offset1 == abjad.Offset(0, 1):
offset1 = abjad.Offset(meter.duration)
if (offset0 % abjad.Offset(base) == abjad.Offset(0, 1)
and offset1 % abjad.Offset(base) == abjad.Offset(0, 1)):
# do not split things like r4 c'2.
continue
if offset0 < half_point_offset < offset1:
if (offset1 == abjad.Offset(meter.duration)
and len(logical_tie) == 1):
# do not split r8 c'2.., r16 c'2..., etc.
break
if any(
abjad.inspect(leaf).duration() == abjad.Duration(2 *
base)
for leaf in logical_tie):
# do not split r8 c'8~c'2 r4, r16 c'8.~c'2~c'8 r8, etc.
break
# do not split tuplets
getter = abjad.select().logical_ties()
result = selection.tuplets().map(getter).flatten()
if logical_tie in result:
break
duration = abjad.Duration(half_point_offset - offset0)
abjad.mutate(logical_tie).split([duration])
if extract_trivial_tuplets:
extract_trivial_tuplets_function(selection)
def remove_repeated_time_signatures(selection: abjad.Selection) -> None:
r"""Mutates an input |abjad.Selection| in place and has no return value;
this function removes all consecutive repeated time signatures.
Basic usage:
When two consecutive measures have identical time signatures, the
second one is removed:
>>> staff = abjad.Staff(r"c'4 d'8 | c'4 d'8")
>>> abjad.attach(abjad.TimeSignature((3, 8)), staff[0])
>>> abjad.attach(abjad.TimeSignature((3, 8)), staff[2])
>>> abjad.show(staff)
.. docs::
\new Staff
{
\time 3/8
c'4
d'8
\time 3/8
c'4
d'8
}
.. figure:: ../_images/remove_repeated_time_signatures-feZSi4Trsg.png
>>> auxjad.mutate.remove_repeated_time_signatures(staff[:])
>>> abjad.show(staff)
.. docs::
\new Staff
{
\time 3/8
c'4
d'8
c'4
d'8
}
.. figure:: ../_images/remove_repeated_time_signatures-ImmpJOWn5U.png
.. note::
Auxjad automatically adds this function as an extension function to
|abjad.mutate|. It can thus be used from either |auxjad.mutate|_ or
|abjad.mutate| namespaces. Therefore, the two lines below are
equivalent:
>>> auxjad.mutate.remove_repeated_time_signatures(staff[:])
>>> abjad.mutate.remove_repeated_time_signatures(staff[:])
Time signature structure:
The function also removes time signatures that are separated by an
arbitrary number of measures without one:
>>> staff = abjad.Staff(r"c'4 d'8 e'4. c'4 d'8")
>>> abjad.attach(abjad.TimeSignature((3, 8)), staff[0])
>>> abjad.attach(abjad.TimeSignature((3, 8)), staff[3])
>>> abjad.show(staff)
.. docs::
\new Staff
{
\time 3/8
c'4
d'8
e'4.
\time 3/8
c'4
d'8
}
.. figure:: ../_images/remove_repeated_time_signatures-ihs4kU1dMe.png
>>> auxjad.mutate.remove_repeated_time_signatures(staff[:])
>>> abjad.show(staff)
.. docs::
\new Staff
{
\time 3/8
c'4
d'8
e'4.
c'4
d'8
}
.. figure:: ../_images/remove_repeated_time_signatures-Ans1RrG5ZW.png
Subcontainers:
The container from which the selection is made can also have
subcontainers, including cases in which the time signatures are
attached to leaves of subcontainers:
>>> staff = abjad.Staff([abjad.Note("c'2"),
... abjad.Chord("<d' f'>2"),
... abjad.Tuplet((2, 3), "g2 a2 b2"),
... ])
>>> abjad.attach(abjad.TimeSignature((2, 2)), staff[0])
>>> abjad.attach(abjad.TimeSignature((2, 2)), staff[2][0])
>>> abjad.show(staff)
.. docs::
\new Staff
{
\time 2/2
c'2
<d' f'>2
\times 2/3
{
\time 2/2
g2
a2
b2
}
}
.. figure:: ../_images/remove_repeated_time_signatures-Nybwh816FT.png
>>> auxjad.mutate.remove_repeated_time_signatures(staff[:])
>>> abjad.show(staff)
.. docs::
\new Staff
{
\time 2/2
c'2
<d' f'>2
\times 2/3
{
g2
a2
b2
}
}
.. figure:: ../_images/remove_repeated_time_signatures-PNCfPcnTtj.png
.. warning::
The input selection must be a contiguous logical voice. When dealing
with a container with multiple subcontainers (e.g. a score containing
multiple staves), the best approach is to cycle through these
subcontainers, applying this function to them individually.
"""
if not isinstance(selection, abjad.Selection):
raise TypeError("argument must be 'abjad.Selection'")
if not selection.leaves().are_contiguous_logical_voice():
raise ValueError("argument must be contiguous logical voice")
measures = selection.group_by_measure()
head = selection.leaf(0)
previous_time_signature = abjad.get.indicator(
head,
abjad.TimeSignature,
)
if previous_time_signature is None:
previous_time_signature = abjad.TimeSignature((4, 4))
for measure in measures[1:]:
head = abjad.select(measure).leaf(0)
time_signature = abjad.get.indicator(head, abjad.TimeSignature)
if time_signature == previous_time_signature:
abjad.detach(abjad.TimeSignature, head)
elif time_signature is not None:
previous_time_signature = time_signature