khodowany
45 lines
2.4 KiB
Python
45 lines
2.4 KiB
Python
from __future__ import annotations
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import generator.harmony
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import generator.model
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import generator.pitch
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def chord_notes(chord: dict) -> tuple[tuple[int, str], ...]:
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return tuple((degree, generator.model.pitch_name(generator.pitch.shift_pitch({**chord['root'], 'octave': 4}, degree - 1, generator.harmony.degree_semitones(degree, alter)))) for degree, alter in generator.harmony.degrees(chord).items())
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def passage(part: str, solo, choices, library) -> str:
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lines = [f'{part.capitalize()}: {solo.label}', 'Positions use source measure numbers and quarter-note beats; arranged measure numbers are also shown.', '']
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lines.append('Scale map:')
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previous = None
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for choice in choices:
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label = choice.scale.label() if choice.scale else 'No exact match within the permitted catalog.' if choice.span.chord else 'N.C.'
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if label != previous:
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lines.append(f' Source measure {choice.span.source_measure}, beat {choice.span.beat}: {label}')
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lines.append(' ' + choice.reason)
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previous = label
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lines.extend(('', 'Chord detail:'))
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for choice in choices:
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span, scale = choice.span, choice.scale
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if span.chord is None:
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continue
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chord = span.chord
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notes = chord_notes(chord)
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required = [name for _, name in notes]
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if bass := chord.get('bass'):
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required.append(generator.model.pitch_name(bass))
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targets = [name for degree, name in notes if degree in (3, 7)] or [name for _, name in notes]
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lines.append(f'Source measure {span.source_measure}, beat {span.beat}; arranged measure {span.measure}; offset {span.start} through {span.end}')
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lines.append(' Chord: ' + generator.harmony.symbol(chord) + '; required pitches: ' + ', '.join(dict.fromkeys(required)))
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if scale:
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root = generator.model.pitch_number({**chord['root'], 'octave': 4}) % 12
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degree, mode = library.chord_mode(scale, generator.model.pitch_name(chord['root'])) if root in scale.pitches else (None, None)
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lines.append(' Parent: ' + scale.label() + ' [' + ', '.join(scale.notes) + ']')
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lines.append(f' Parent degree: {degree or "omitted root"}; chord-root mode: {mode or "not assigned"}')
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lines.append(' Chord-tone targets: ' + ', '.join(targets))
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if generator.model.pitch_name(chord['root']) == scale.root:
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lines.append(' Tonic resolution target: ' + scale.root)
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else:
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lines.append(' No exact match within the permitted catalog.')
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lines.extend((' Reason: ' + choice.reason, ''))
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return '\n'.join(lines)
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