khodowany
71 lines
2.8 KiB
Python
71 lines
2.8 KiB
Python
"""Versioned production vocabulary. This module never reads audition inputs."""
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from __future__ import annotations
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import contextlib
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import contextvars
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import dataclasses
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import functools
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import hashlib
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import json
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import pathlib
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import fractions
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ROOT = pathlib.Path(__file__).resolve().parents[1] / 'data' / 'composition'
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ACTIVE = contextvars.ContextVar('composition_vocabulary', default=None)
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def load(root=ROOT):
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# Content, not just the directory, keys memoization. Long-lived individual
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# role builds must observe edited production data without restarting Python.
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names = ('roles', 'harmony', 'lead_ins', 'accompaniment')
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return _load(tuple((name, (pathlib.Path(root) / (name + '.json')).read_text()) for name in names))
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@functools.lru_cache(maxsize=16)
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def _load(contents):
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result = {}
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for name, text in contents:
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value = json.loads(text)
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if value.get('version') != (2 if name == 'accompaniment' else 1) or not value.get('provenance') or not value.get('license'):
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raise ValueError(f'{name}: unsupported or unprovenanced production vocabulary')
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if name == 'accompaniment':
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if fractions.Fraction(value['grid']) != fractions.Fraction(1, 2):
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raise ValueError('accompaniment requires an eighth-note placement grid')
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for lane in ('electric', 'bass', 'upper'):
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layer = value['layers'][lane]
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if not 0 <= layer['attacks'][0] <= layer['attacks'][1] <= 3 or not layer['families']:
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raise ValueError('invalid accompaniment attack range or duration families')
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for family in layer['families']:
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if not value['families'][family] or any(fractions.Fraction(d) <= 0 for d in value['families'][family]):
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raise ValueError('accompaniment durations must be positive')
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if not 1 <= value['lane_candidates'] <= 64 or not 1 <= value['measure_candidates'] <= 64:
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raise ValueError('accompaniment candidate budgets must be 1–64')
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entries = value.get('cells', value.get('patterns', value.get('colors', value.get('transformations', []))))
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if len({v['id'] for v in entries}) != len(entries):
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raise ValueError(f'{name}: duplicate vocabulary ID')
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result[name] = value
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return result
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@functools.lru_cache(maxsize=1)
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def _default():
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return {'data': load(), 'role': '', 'settings': {}}
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def current():
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return ACTIVE.get() or _default()
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def data(name):
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return current()['data'][name]
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def role(name=None):
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active = current()
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name = name or active['role']
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return {**active['data']['roles']['roles'].get(name, {}), **active['settings']}
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@contextlib.contextmanager
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def using(resources, name, settings=None):
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token = ACTIVE.set({'data': resources, 'role': name, 'settings': settings or {}})
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try:
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yield
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finally:
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ACTIVE.reset(token)
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def fingerprint(value):
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return hashlib.sha256(json.dumps(value, sort_keys=True, separators=(',', ':')).encode()).hexdigest()
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