khodowany
49 lines
3.7 KiB
Python
49 lines
3.7 KiB
Python
"""The single production entry point for independent phrase composition."""
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from fractions import Fraction as F
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import time
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import dataclasses
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from generator import harmony as chords, vocabulary
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from generator.scales import timeline, selection
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from generator.solo import types, profiles, harmonic, construction, placement, policy
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def compose(analysis,measures,part,end,*,scales,sequences,rhythms,initial=None,expressions_enabled=True,start=F()):
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began=time.monotonic()
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choices=selection.select(timeline.read({'measures':measures},initial=initial),timeline.Solo(F(),end-start,part.capitalize()+' Solo'),scales)
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choices=tuple(dataclasses.replace(c,span=dataclasses.replace(c.span,start=c.span.start+start,end=c.span.end+start)) for c in choices)
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for c in choices:
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if c.span.chord and c.scale is None:raise ValueError(f'{part} solo, source measure {c.span.source_measure}, beat {c.span.beat}, {chords.symbol(c.span.chord)}: No exact match within the permitted catalog')
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profile=profiles.for_part(part,analysis);harmony=harmonic.Harmony(choices,profile)
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source=tuple((n.start,n.end,n.pitch) for n in analysis.melody)
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seed=vocabulary.role().get('choice_seed') or policy.stable_rank(part,(source,tuple((c.span.start,c.span.end,c.span.chord) for c in choices),vocabulary.role(part+'_solo'),policy.DEFAULT.composition_version))
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builder=construction.Builder(analysis,measures,harmony,sequences,rhythms,end,seed,expressions_enabled,start=start)
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phrases=builder.compose()
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# Resolve hand-position transitions over the selected whole melody. This
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# cannot reselect pitches, rhythm or another independently generated part.
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raw=tuple(n for p in phrases for n in p.notes)
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placed=placement.place(raw,analysis.tempo,profile=profile) if raw else (0,())
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if placed is None:raise construction.SearchExhausted('selected melody has no complete legal guitar path')
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by_id={n.event_id:n for n in placed[1]}
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phrases=tuple(dataclasses.replace(p,notes=tuple(by_id[n.event_id] for n in p.notes)) for p in phrases)
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result=types.Solo(part,choices,phrases,analysis.tempo,end,{'construction':'complete_phrase_frontiers','version':policy.DEFAULT.composition_version,
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'construction_seconds':time.monotonic()-began,**builder.timings,'operation_coverage':{k:dict(v) for k,v in builder.coverage.items()},
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'frontiers':builder.frontiers,'completed_candidates':[{'rank':i+1,'evaluation':dataclasses.asdict(s.evaluation),'events':[(str(n.start),str(n.end),n.pitch.number()) for n in s.notes]} for i,s in enumerate(builder.completed)],'rejections':dict(builder.failures),'decisions':builder.decisions,'expressions_enabled':expressions_enabled},profile,start)
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validate(result)
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return result
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def validate(solo):
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previous=None
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for note in solo.notes():
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if note.start<solo.start or note.end>solo.end or note.end<=note.start or previous and previous.end>note.start:raise ValueError('overlapping/out-of-bounds sounding event')
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if note.position not in placement.positions(note.pitch.number(),solo.profile):raise ValueError('invalid guitar placement')
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previous=note
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expressions=tuple(c for p in solo.phrases for c in p.expressions)
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checked=harmonic.Harmony(solo.choices).evaluate(solo.notes(),until=solo.end,complete=True,expressions=expressions)
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if not checked.valid:raise ValueError(checked.error)
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cursor=solo.start
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for p in solo.phrases:
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if p.start!=cursor or p.end<=p.start:raise ValueError('phrase coverage gap or overlap')
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cursor=p.end
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valid,error=harmonic.anchors_valid((p.destination,) if p.destination else (),p.notes,p.end,complete=True,closure='closed' if p.ending in ('complete','handoff') else 'open')
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if not valid:raise ValueError(error)
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if cursor!=solo.end:raise ValueError('incomplete solo duration')
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