| """Configuration utilities for polynomial manipulation algorithms. """ |
|
|
|
|
| from contextlib import contextmanager |
|
|
| _default_config = { |
| 'USE_COLLINS_RESULTANT': False, |
| 'USE_SIMPLIFY_GCD': True, |
| 'USE_HEU_GCD': True, |
|
|
| 'USE_IRREDUCIBLE_IN_FACTOR': False, |
| 'USE_CYCLOTOMIC_FACTOR': True, |
|
|
| 'EEZ_RESTART_IF_NEEDED': True, |
| 'EEZ_NUMBER_OF_CONFIGS': 3, |
| 'EEZ_NUMBER_OF_TRIES': 5, |
| 'EEZ_MODULUS_STEP': 2, |
|
|
| 'GF_IRRED_METHOD': 'rabin', |
| 'GF_FACTOR_METHOD': 'zassenhaus', |
|
|
| 'GROEBNER': 'buchberger', |
| } |
|
|
| _current_config = {} |
|
|
| @contextmanager |
| def using(**kwargs): |
| for k, v in kwargs.items(): |
| setup(k, v) |
|
|
| yield |
|
|
| for k in kwargs.keys(): |
| setup(k) |
|
|
| def setup(key, value=None): |
| """Assign a value to (or reset) a configuration item. """ |
| key = key.upper() |
|
|
| if value is not None: |
| _current_config[key] = value |
| else: |
| _current_config[key] = _default_config[key] |
|
|
|
|
| def query(key): |
| """Ask for a value of the given configuration item. """ |
| return _current_config.get(key.upper(), None) |
|
|
|
|
| def configure(): |
| """Initialized configuration of polys module. """ |
| from os import getenv |
|
|
| for key, default in _default_config.items(): |
| value = getenv('SYMPY_' + key) |
|
|
| if value is not None: |
| try: |
| _current_config[key] = eval(value) |
| except NameError: |
| _current_config[key] = value |
| else: |
| _current_config[key] = default |
|
|
| configure() |
|
|
