khodowany
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"""Score document validation, above pure musical values and instrument rules."""
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from __future__ import annotations
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import fractions
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import generator.fretboard
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import generator.model
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import generator.pitch
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def validate_document(document: dict) -> None:
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if not isinstance(document, dict) or not isinstance(document.get('metadata'), dict):
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raise ValueError('score requires a metadata object')
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if any(not isinstance(document['metadata'].get(name), str) for name in ('title', 'composer', 'key_signature', 'time_signature')):
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raise ValueError('score metadata requires title, composer, key_signature and time_signature strings')
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staves = document.get('staves', [])
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if not isinstance(staves, list) or len(staves) != 1 or not isinstance(staves[0], dict):
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raise ValueError('exactly one staff is currently supported')
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if not isinstance(staves[0].get('measures'), list) or not staves[0]['measures']:
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raise ValueError('score requires measures')
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instruments = staves[0].get('instruments', [])
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instrument_ids = {i['id'] for i in instruments}
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if len(instruments) != len(instrument_ids) or any(not isinstance(i, str) or not i for i in instrument_ids):
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raise ValueError('score instruments require unique nonempty IDs')
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ids: set[str] = set()
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events: dict[str, dict] = {}
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tones: dict[str, tuple[dict, fractions.Fraction, fractions.Fraction, str]] = {}
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ownership: dict[str, str] = {}
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absolute = fractions.Fraction()
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for measure in staves[0]['measures']:
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if {'repeats', 'endings', 'initial_attributes'} & measure.keys():
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raise ValueError('repeat notation is unsupported; regenerate scores from music written out in reading order')
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length = generator.model.fraction(measure['duration'])
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if length <= 0:
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raise ValueError('measure duration must be positive')
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voices = measure.get('voices', [])
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if not voices or len({v['id'] for v in voices}) != len(voices) or any(not v['id'] for v in voices):
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raise ValueError('measure requires uniquely identified voice lanes')
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previous_ends = {v['id']: fractions.Fraction() for v in voices}
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for voice, note in ((v, n) for v in voices for n in v['notes']):
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if any({'sound_ties', 'printed_ties'} & pitch.keys() for pitch in note['pitches']):
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raise ValueError('pass-specific tie metadata is unsupported; regenerate scores')
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if not note['id'] or note['id'] in ids:
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raise ValueError(f'duplicate event ID: {note["id"]}')
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ids.add(note['id'])
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events[note['id']] = note
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ownership[note['id']] = voice['id']
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if note.get('voice', voice['id']) != voice['id']:
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raise ValueError('event voice ownership disagrees with its lane')
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onset, duration = generator.model.fraction(note['onset']), generator.model.fraction(note['duration'])
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if onset < 0 or duration < 0 or onset + duration > length:
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raise ValueError(f'event outside measure: {note["id"]}')
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if note['kind'] not in ('note', 'rest', 'spacer'):
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raise ValueError('invalid event kind')
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if not note.get('grace'):
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if duration == 0 or onset < previous_ends[voice['id']]:
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raise ValueError('overlapping events in one rhythmic voice')
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previous_ends[voice['id']] = onset + duration
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elif duration != 0:
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raise ValueError('grace notes must not advance metric time')
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expected = generator.model.metric_length(note['written'])
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if not note.get('grace') and not note.get('measure_rest') and duration != expected:
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raise ValueError('metric and written event durations disagree')
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if note['kind'] != 'note' and note.get('pitches'):
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raise ValueError('rests and spacers cannot contain pitches')
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if note['kind'] == 'note' and not note.get('pitches') and note.get('notehead') != 'slash':
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raise ValueError('pitched event requires at least one pitch')
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for p in note.get('pitches', []):
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if p.get('instrument') and p['instrument'] not in instrument_ids:
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raise ValueError('note refers to an unknown score instrument')
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if 'unpitched' in p:
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position = p['unpitched']
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if position['letter'] not in generator.model.LETTERS or type(position['octave']) is not int:
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raise ValueError('invalid unpitched display position')
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else:
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generator.model.pitch_number(p)
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if staves[0].get('tablature'):
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tab = p.get('tablature', {})
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string, fret = tab.get('string'), tab.get('fret')
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if type(string) is not int or type(fret) is not int or string not in dict(generator.fretboard.STANDARD_TUNING) or not generator.fretboard.MIN_FRET <= fret <= generator.fretboard.MAX_FRET:
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raise ValueError(f'{p["id"]}: invalid generated tablature position')
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state = dict(measure)
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for change in measure.get('attributes', []):
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if generator.model.fraction(change['onset']) <= onset:
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state.update(change)
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if dict(generator.fretboard.STANDARD_TUNING)[string] + fret != generator.pitch.sounding_pitch(p, state):
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raise ValueError(f'{p["id"]}: tablature disagrees with sounding pitch')
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pd = generator.model.fraction(p['duration'])
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if pd < 0 or (pd == 0 and not note.get('grace')) or pd > duration or not p['id'] or p['id'] in tones:
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raise ValueError('invalid chord-tone duration or duplicate ID')
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if not note.get('grace') and pd != generator.model.metric_length(p['written']):
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raise ValueError('metric and written chord-tone durations disagree')
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tones[p['id']] = (p, absolute + onset, pd, voice['id'])
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for harmony in measure.get('harmonies', []):
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if not 0 <= generator.model.fraction(harmony['onset']) < length:
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raise ValueError('harmony outside measure')
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for change in measure.get('attributes', []):
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if not 0 <= generator.model.fraction(change['onset']) < length:
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raise ValueError('attribute change outside measure')
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for state in [measure, *measure.get('attributes', [])]:
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if 'meter' in state:
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generator.model.validate_meter(state['meter'])
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if 'key' in state:
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if len(state['key']['alterations']) != 7:
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raise ValueError('key alterations must contain seven exact alterations')
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for value in state['key']['alterations']:
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generator.model.alteration(value)
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if 'clef' in state and (state['clef']['sign'] not in ('G', 'F', 'C', 'percussion', 'none') or not 1 <= state['clef']['line'] <= 6 or not -3 <= state['clef']['octave_change'] <= 3):
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raise ValueError('invalid clef')
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absolute += length
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for identifier, (p, start, duration, voice) in tones.items():
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if target := p.get('tie_to'):
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if target not in tones:
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raise ValueError(f'dangling tie: {identifier} -> {target}')
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other, next_start, _, next_voice = tones[target]
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same_pitch = all(p.get(k) == other.get(k) for k in ('unpitched', 'instrument')) if 'unpitched' in p else all(p.get(k) == other.get(k) for k in ('letter', 'alter', 'octave'))
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if other.get('tie_from') != identifier or not same_pitch or next_voice != voice or next_start != start + duration:
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raise ValueError(f'invalid tie: {identifier} -> {target}')
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if staves[0].get('tablature') and p['tablature'] != other['tablature']:
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raise ValueError(f'{identifier}: tied guitar tones must retain their string and fret')
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if source := p.get('tie_from'):
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if source not in tones or tones[source][0].get('tie_to') != identifier:
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raise ValueError(f'dangling incoming tie: {identifier}')
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span_ids = set()
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event_order = {identifier: index for index, identifier in enumerate(events)}
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for span in staves[0].get('tuplets', []):
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if not span['id'] or span['id'] in span_ids or span['start'] not in ids or span['end'] not in ids or not 0 < span['note_count'] <= 1000000 or not 0 < span['space_count'] <= 1000000 or not 0 <= span['depth'] <= 16:
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raise ValueError('invalid tuplet span')
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members = [n['id'] for n in events.values() if span['id'] in n.get('tuplet_ids', [])]
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if not members or members[0] != span['start'] or members[-1] != span['end'] or event_order[span['start']] > event_order[span['end']]:
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raise ValueError('tuplet endpoints disagree with member events')
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if len({ownership[n] for n in members}) != 1 or span.get('voice', ownership[members[0]]) != ownership[members[0]]:
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raise ValueError('tuplet crosses independent voice lanes')
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if span.get('bracket', 'auto') not in ('yes', 'no', 'auto') or span.get('show_number', 'actual') not in ('none', 'actual', 'both'):
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raise ValueError('invalid tuplet appearance')
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span_ids.add(span['id'])
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for note in events.values():
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for verse in note.get('lyrics', []):
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start = tones[note['pitches'][0]['id']][1] if note['pitches'] else fractions.Fraction()
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if 'extend_to' in verse and not start < generator.model.fraction(verse['extend_to']) <= absolute:
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raise ValueError('lyric extension endpoint is outside the score')
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if any(t not in span_ids for t in note.get('tuplet_ids', [])):
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raise ValueError('event refers to an unknown tuplet')
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if tremolo := note.get('tremolo'):
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if tremolo['type'] not in ('single', 'start', 'stop') or type(tremolo['marks']) is not int or not 0 <= tremolo['marks'] <= 8:
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raise ValueError('invalid measured tremolo')
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if tremolo['type'] in ('start', 'stop'):
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other = events.get(tremolo.get('partner'))
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expected_type = 'stop' if tremolo['type'] == 'start' else 'start'
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if not other or other.get('tremolo', {}).get('partner') != note['id'] or other['tremolo']['type'] != expected_type or other['tremolo']['marks'] != tremolo['marks']:
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raise ValueError('invalid paired tremolo')
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for span in staves[0].get('octave_shifts', []):
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if not 0 <= generator.model.fraction(span['start']) < generator.model.fraction(span['end']) <= absolute or not -3 <= span['octaves'] <= 3:
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raise ValueError('invalid octave-shift span')
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previous_end = fractions.Fraction()
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for span in staves[0].get('scale_spans', []):
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start, end = generator.model.fraction(span['start']), generator.model.fraction(span['end'])
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if not previous_end <= start < end <= absolute or not isinstance(span.get('label'), str) or not span['label'].strip() or type(span.get('matched')) is not bool:
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raise ValueError('invalid solo scale span')
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if not isinstance(span.get('id'), str) or not span['id'] or span['id'] in ids:
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raise ValueError('solo scale spans require unique IDs')
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ids.add(span['id'])
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previous_end = end
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