def test_sub(self):
""" Test subtraction """
f0 = Fraction(5)
f1 = Fraction(6)
self.assertEqual(f0 - f1, -1)
f2 = Fraction(7, 12) - f0
self.assertEqual(f2, Fraction("-4 5/12"))
self.assertEqual(f2, Fraction(-53, 12))
def test_simplify(self):
"""
Basic test of simplification of fractions.
"""
f0 = Fraction(9, 10)
f1 = Fraction(18, 20)
self.assertEqual(f0, f1)
f2 = Fraction(17, 20)
self.assertNotEqual(f0, f2)
def test_add(self):
"""
Try adding Fractions together.
"""
f0 = Fraction(5)
f1 = Fraction(6)
self.assertEqual(f0 + f1, 11)
f2 = Fraction(7, 12) + f0
self.assertEqual(f2, Fraction("5 7/12"))
self.assertEqual(f2, Fraction(67, 12))
def test_reparse_string(self):
"""
Create some random fractions, get their string representation and check
the this can by used to correctly reinstantiate the fraction.
"""
from random import randint
for i in range(50):
# Create a random fraction
f0 = Fraction(randint(0, 100), randint(1, 100))
f0_str = str(f0)
self.assertEqual(f0, Fraction(f0_str))
def test_mul(self):
""" Test multiplication """
f0 = Fraction(1, 2) * Fraction(3)
self.assertEqual(f0, Fraction(3, 2))
f1 = Fraction(5, 7) * Fraction(3, 9)
self.assertEqual(f1, Fraction(15, 63))
f2 = Fraction(-5, 7) * Fraction(3, -9)
self.assertEqual(f2, f1)
def test_int(self):
""" Conversion to int """
from random import randint
for i in range(50):
n = randint(0, 100)
d = randint(1, 100)
self.assertEqual(int(Fraction(n, d)), n / d)
def test_long(self):
""" Conversion to long """
from random import randint
for i in range(50):
n = randint(0, 100)
d = randint(1, 100)
self.assertEqual(long(Fraction(n, d)), long(n) / long(d))
def get_signs_for_word(self, index, offset=0):
if offset > 0:
return []
else:
all_signs = self.tags[index]
return [(sign, sign.tag, Fraction(1, len(all_signs)))
for sign in all_signs]
def test_float(self):
""" Conversion to float """
from random import randint
for i in range(50):
n = randint(0, 100)
d = randint(1, 100)
self.assertEqual(float(Fraction(n, d)), float(n) / float(d))
def test_zero_denominator(self):
"""
Setting a Fraction's denominator to 0 should raise an error.
"""
self.assertRaises(ZeroDivisionError, Fraction, 5, 0)
f = Fraction(1)
self.assertRaises(ZeroDivisionError, lambda x: f / x, 0)
def _get_duration(tokens):
"""Get a 'for' duration specification out of a line's tokens.
Returns duration in quarter notes."""
duration = 1
if "for" in tokens:
forpos = tokens.index("for")
try:
duration = float(Fraction(tokens.pop(forpos+1)))
except:
raise HarmonicalInputFileReadError, "'for' "\
"must be followed by an integer number "\
"of beats."
tokens.pop(forpos)
return duration
def __init__(self,
inputs,
durations=None,
times=None,
roman=False,
*args,
**kwargs):
super(ChordInput, self).__init__(*args, **kwargs)
self.inputs = inputs
self.durations = durations
self.times = times
self.roman = roman
# Compute the durations from times or vice versa
if durations is None and times is None:
raise ValueError, "cannot create a ChordInput with neither "\
"times nor durations given"
elif times is None:
self.times = [
sum(durations[:i], Fraction(0)) for i in range(len(durations))
]
elif durations is None:
from jazzparser.utils.base import group_pairs
self.durations = [
time1 - time0 for (time1, time0) in group_pairs(times)
] + [Fraction(1)]
# Convert all strings to internal chord representation
# Done now so we check the chords can all be understood before doing
# anything else
self.chords = [
Chord.from_name(name, roman=roman).to_db_mirror()
for name in inputs
]
for chord, dur in zip(self.chords, self.durations):
chord.duration = dur
def test_create_string(self):
"""
Test creating a fraction from a string representation.
"""
f0 = Fraction("1 1/4")
self.assertEqual(f0, Fraction(5, 4))
f1 = Fraction("5")
self.assertEqual(f1, Fraction(5))
f2 = Fraction("5/4")
self.assertEqual(f2, Fraction(5, 4))
for invalid in ["", "1.5", "1/1/1", "5 5", "4\\5", "a", "X"]:
self.assertRaises(Fraction.ValueError, Fraction, invalid)
def __init__(self, inputs, durations=None, times=None, id=None, \
chords=None, sequence=None, *args, **kwargs):
super(DbInput, self).__init__(*args, **kwargs)
self.inputs = inputs
self.durations = durations
self.times = times
self.id = id
self.chords = chords
self.sequence = sequence
if durations is None and times is None:
raise ValueError, "cannot create a DbInput with neither "\
"times nor durations given"
elif times is None:
self.times = [sum(durations[:i]) for i in range(len(durations))]
elif durations is None:
from jazzparser.utils.base import group_pairs
self.durations = [
time1 - time0 for (time1, time0) in group_pairs(times)
] + [Fraction(1)]
def assign_durations(string):
"""
Computes the durations for each chord token in the string.
Chords on their own get a duration of 1. Comma-separated sequences
of chords get a duration of 1, split evenly between the members
of the sequence.
"""
from jazzparser.data import Fraction
# Make sure the commas are separate tokens
string = string.replace(",", " , ")
string = string.replace(":", " : ")
string = string.replace("|", "")
tokens = string.split()
# Group tokens into comma-separated sequences
in_sequence = False
units = []
for token in tokens:
if token == "," or token == ":":
# The next token is in the same sequence as the last
in_sequence = True
elif in_sequence:
# This token should be added to the previous token's sequence
units[-1].append(token)
in_sequence = False
else:
# Start of a new sequence
units.append([token])
# Now build the list of durations
durations = []
for unit in units:
# Each sequence has a total length of 4 (assume 4 beats in bar)
# Split this between its members.
denominator = len(unit)
members = [Fraction(4,denominator)] * denominator
durations.extend(members)
return durations
def test_div(self):
""" Test division """
f0 = Fraction(1, 2) / 3
self.assertEqual(f0, Fraction(1, 6))
f0 = Fraction(1, 2) / Fraction(3)
self.assertEqual(f0, Fraction(1, 6))
f1 = Fraction(5, 7) / Fraction(3, 9)
self.assertEqual(f1, Fraction(45, 21))
f2 = Fraction(-5, 7) / Fraction(3, -9)
self.assertEqual(f2, f1)
f3 = Fraction(5, 7) / 0.5
self.assertEqual(f3, 10.0 / 7.0)
def render(self):
"""
Creates MIDI data from the path and chord types.
@rtype: midi.EventStream
@return: an event stream containing all the midi events
"""
mid = EventStream()
mid.add_track()
# Set the tempo at the beginning
tempo = SetTempoEvent()
tempo.tempo = self.tempo
mid.add_event(tempo)
# Set the instrument at the beginning
instr = ProgramChangeEvent()
instr.value = self.instrument
mid.add_event(instr)
beat_length = mid.resolution
# Work out when each root change occurs
time = Fraction(0)
root_times = []
for root, length in self.path:
root_times.append((root, time))
time += length
def _root_at_time(time):
current_root = root_times[0][0]
for root, rtime in root_times[1:]:
# Move through root until we get the first one that
# occurs after the previous time
if rtime > time:
return current_root
current_root = root
# If we're beyond the time of the last root, use that one
return current_root
# Add each chord
time = Fraction(0)
bass_events = []
bass = self.bass_root is not None
for chord_type, length in self.chord_types:
tick_length = length * beat_length - 10
tick_time = time * beat_length
# Find out what root we're on at this time
root = _root_at_time(time)
# Add all the necessary events for this chord
chord_events = events_for_chord(
root,
chord_type,
int(tick_time),
int(tick_length),
equal_temperament=self.equal_temperament,
root_octave=self.root_octave,
double_root=(self.double_root or bass))
if bass:
# Add the bass note to the bass track
bass_events.extend([copy.copy(ev) for ev in chord_events[-1]])
if bass and not self.double_root:
# Remove the doubled root that we got for the bass line
chord_events = sum(chord_events[:-1], [])
# Add the main chord notes to the midi track
for ev in chord_events:
mid.add_event(ev)
time += length
if bass:
bass_channel = 1
# Add another track to the midi file for the bass notes
mid.add_track()
# Select a bass instrument - picked bass
instr = ProgramChangeEvent()
instr.value = 33
instr.channel = bass_channel
mid.add_event(instr)
# Add all the bass notes
for ev in bass_events:
ev.channel = bass_channel
mid.add_event(ev)
return mid
def test_create_fraction(self):
""" Simplest instantiation: fraction """
f = Fraction(9, 10)
def test_neg(self):
""" Try negating Fractions """
f0 = Fraction(5, 7)
self.assertEqual(-f0, Fraction(-5, 7))
f1 = Fraction("5 4/5")
self.assertEqual(-f1, Fraction("-5 4/5"))
def test_equal(self):
""" Test that equal Fractions evaluate as equal """
from random import randint
for i in range(10):
n = randint(0, 100)
d = randint(1, 100)
self.assertEqual(Fraction(n, d), Fraction(n, d))
self.assertEqual(Fraction(50, 4), Fraction("12 1/2"))
self.assertEqual(Fraction(50, 4), Fraction(25, 2))
self.assertEqual(Fraction(7, 6), --Fraction(7, 6))
f = Fraction(7, 19)
self.assertEqual(f, f / Fraction(6, 17) * Fraction(12, 34))
def path_to_tones(path, tempo=120, chord_types=None, root_octave=0,
double_root=False, equal_temperament=False, timings=False):
"""
Takes a tonal space path, given as a list of coordinates, and
generates the tones of the roots.
@type path: list of (3d-coordinate,length) tuples
@param path: coordinates of the points in the sequence and the length
of each, in beats
@type tempo: int
@param tempo: speed in beats per second (Maelzel's metronome)
@type chord_types: list of (string,length)
@param chord_types: the type of chord to use for each tone and the
time spent on that chord type, in beats. See
L{CHORD_TYPES} keys for possible values.
@type equal_temperament: bool
@param equal_temperament: render all the pitches as they would be
played in equal temperament.
@rtype: L{ToneMatrix}
@return: a tone matrix that can be used to render the sound
"""
# Use this envelope for all notes
envelope = piano_envelope()
sample_rate = DEFAULT_SAMPLE_RATE
beat_length = 60.0 / tempo
if timings:
root_times = path
else:
# Work out when each root change occurs
time = Fraction(0)
root_times = []
for root,length in path:
root_times.append((root,time))
time += length
def _root_at_time(time):
current_root = root_times[0][0]
for root,rtime in root_times[1:]:
# Move through root until we get the first one that
# occurs after the previous time
if rtime > time:
return current_root
current_root = root
# If we're beyond the time of the last root, use that one
return current_root
if chord_types is None:
# Default to just pure tones
chord_types = [('prime',length) for __,length in path]
if equal_temperament:
_pitch_ratio = tonal_space_et_pitch
else:
_pitch_ratio = tonal_space_pitch_2d
# Build the tone matrix by adding the tones one by one
matrix = ToneMatrix(sample_rate=sample_rate)
time = Fraction(0)
for ctype,length in chord_types:
coord = _root_at_time(time)
pitch_ratio = _pitch_ratio(coord)
duration = beat_length * float(length)
# We want all enharmonic equivs of I to come out close to I,
# not an octave above
if not equal_temperament and coordinate_to_et_2d(coord) == 0 \
and pitch_ratio > 1.5:
pitch_ratio /= 2.0
# Use a sine tone for each note
tone = SineChordEvent(220*pitch_ratio, chord_type=ctype, duration=duration, envelope=envelope, root_octave=root_octave, root_weight=1.2, double_root=double_root)
matrix.add_tone(beat_length * float(time), tone)
time += length
return matrix
def test_create_int(self):
""" Simplest instantiation: int """
f = Fraction(9)
self.assertEqual(f, 9)
