Coverage for pygeodesy/props.py: 98%

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1 

2# -*- coding: utf-8 -*- 

3 

4u'''Mutable, immutable and caching/memoizing properties and 

5deprecation decorators. 

6 

7To enable C{DeprecationWarning}s from C{PyGeodesy}, set env var 

8C{PYGEODESY_WARNINGS} to a non-empty string I{AND} run C{python} 

9with command line option C{-X dev} or with one of the C{-W} 

10choices, see callable L{DeprecationWarnings} below. 

11''' 

12 

13# from pygeodesy.basics import isclass # _MODS 

14from pygeodesy.errors import _AssertionError, _AttributeError, \ 

15 _xkwds, _xkwds_get 

16from pygeodesy.interns import MISSING, NN, _an_, _COMMASPACE_, \ 

17 _DEPRECATED_, _DOT_, _EQUALSPACED_, \ 

18 _immutable_, _invalid_, _module_, _N_A_, \ 

19 _not_, _SPACE_, _UNDER_, _DNL_ # PYCHOK used! 

20# from pygeodesy.named import callname # _MODS, avoid circular 

21from pygeodesy.lazily import _ALL_LAZY, _ALL_MODS as _MODS, \ 

22 _FOR_DOCS, _WARNINGS_X_DEV 

23# from pygeodesy.streprs import Fmt # _MODS 

24 

25from functools import wraps as _wraps 

26 

27__all__ = _ALL_LAZY.props 

28__version__ = '23.08.23' 

29 

30_class_ = 'class' 

31_dont_use_ = _DEPRECATED_ + ", don't use." 

32_function_ = 'function' 

33_get_and_set_ = 'get and set' 

34_has_been_ = 'has been' # PYCHOK used! 

35_method_ = 'method' 

36_not_an_inst_ = _not_(_an_, 'instance') 

37 

38 

39def _allPropertiesOf(Clas_or_inst, *Bases): 

40 '''(INTERNAL) Yield all C{R/property/_RO}s at C{Clas_or_inst} 

41 as specified in the C{Bases} arguments. 

42 ''' 

43 if _isclass(Clas_or_inst): 

44 S = Clas_or_inst, # just this Clas 

45 else: # class and super-classes of inst 

46 try: 

47 S = Clas_or_inst.__class__.__mro__[:-1] # not object 

48 except AttributeError: 

49 raise 

50 S = () # not an inst 

51 B = Bases or _PropertyBase 

52 for C in S: 

53 for n, p in C.__dict__.items(): 

54 if isinstance(p, B) and p.name == n: 

55 yield p 

56 

57 

58def _allPropertiesOf_n(n, Clas_or_inst, *Bases): 

59 '''(INTERNAL) Assert the number of C{R/property/_RO}s at C{Clas_or_inst}. 

60 ''' 

61 t = tuple(p.name for p in _allPropertiesOf(Clas_or_inst, *Bases)) 

62 if len(t) != n: 

63 raise _AssertionError(_COMMASPACE_.join(t), Clas_or_inst, 

64 txt=_COMMASPACE_(len(t), _not_(n))) 

65 return t 

66 

67 

68def _hasProperty(inst, name, *Classes): # in .named._NamedBase._update 

69 '''(INTERNAL) Check whether C{inst} has a C{P/property/_RO} by this C{name}. 

70 ''' 

71 p = getattr(inst.__class__, name, None) # walks __class__.__mro__ 

72 return bool(p and isinstance(p, Classes or _PropertyBase) 

73 and p.name == name) 

74 

75 

76def _isclass(obj): 

77 '''(INTERNAL) Get and overwrite C{_isclass}. 

78 ''' 

79 f = _MODS.basics.isclass 

80 # assert __name__.endswith('.props') 

81 _MODS.props._isclass = f 

82 return f(obj) 

83 

84 

85def _update_all(inst, *attrs, **Base): 

86 '''(INTERNAL) Zap all I{cached} L{property_RO}s, L{Property}s, 

87 L{Property_RO}s and the named C{attrs} of an instance. 

88 

89 @return: The number of updates (C{int}), if any. 

90 ''' 

91 if _isclass(inst): 

92 raise _AssertionError(inst, txt=_not_an_inst_) 

93 try: 

94 d = inst.__dict__ 

95 except AttributeError: 

96 return 0 

97 u = len(d) 

98 if u: 

99 B = _xkwds_get(Base, Base=_PropertyBase) 

100 for p in _allPropertiesOf(inst, B): 

101 p._update(inst) # d.pop(p.name, None) 

102 

103 if attrs: 

104 _update_attrs(inst, *attrs) # remove attributes from inst.__dict__ 

105 u -= len(d) 

106 return u # updates 

107 

108 

109# def _update_all_from(inst, other, **Base): 

110# '''(INTERNAL) Update all I{cached} L{Property}s and 

111# L{Property_RO}s of instance C{inst} from C{other}. 

112# 

113# @return: The number of updates (C{int}), if any. 

114# ''' 

115# if _isclass(inst): 

116# raise _AssertionError(inst, txt=_not_an_inst_) 

117# try: 

118# d = inst.__dict__ 

119# f = other.__dict__ 

120# except AttributeError: 

121# return 0 

122# u = len(f) 

123# if u: 

124# u = len(d) 

125# B = _xkwds_get(Base, Base=_PropertyBase) 

126# for p in _allPropertiesOf(inst, B): 

127# p._update_from(inst, other) 

128# u -= len(d) 

129# return u # number of updates 

130 

131 

132def _update_attrs(inst, *attrs): 

133 '''(INTERNAL) Zap all named C{attrs} of an instance. 

134 

135 @return: The number of updates (C{int}), if any. 

136 ''' 

137 try: 

138 d = inst.__dict__ 

139 except AttributeError: 

140 return 0 

141 u = len(d) 

142 if u: # zap attrs from inst.__dict__ 

143 _p = d.pop 

144 for a in attrs: 

145 _ = _p(a, MISSING) 

146# if _ is MISSING and not hasattr(inst, a): 

147# n = _MODS.named.classname(inst, prefixed=True) 

148# a = _DOT_(n, _SPACE_(a, _invalid_)) 

149# raise _AssertionError(a, txt=repr(inst)) 

150# _ = _p(a, None) # redo: hasattr side effect 

151 u -= len(d) 

152 # assert u >= 0 

153 return u # number of named C{attrs} zapped 

154 

155 

156class _PropertyBase(property): 

157 '''(INTERNAL) Base class for C{P/property/_RO}. 

158 ''' 

159 def __init__(self, method, fget, fset, doc=NN): 

160 

161 if not callable(method): 

162 self.getter(method) # PYCHOK no cover 

163 

164 self.method = method 

165 self.name = method.__name__ 

166 d = doc or method.__doc__ 

167 if _FOR_DOCS and d: 

168 self.__doc__ = d # PYCHOK no cover 

169 

170 property.__init__(self, fget, fset, self._fdel, d or _N_A_) 

171 

172 def _fdel(self, inst): 

173 '''Zap the I{cached/memoized} C{property} value. 

174 ''' 

175 self._update(inst, None) # PYCHOK no cover 

176 

177 def _fget(self, inst): 

178 '''Get and I{cache/memoize} the C{property} value. 

179 ''' 

180 try: # to get the value cached in instance' __dict__ 

181 return inst.__dict__[self.name] 

182 except KeyError: 

183 # cache the value in the instance' __dict__ 

184 inst.__dict__[self.name] = val = self.method(inst) 

185 return val 

186 

187 def _fset_error(self, inst, val): 

188 '''Throws an C{AttributeError}, always. 

189 ''' 

190 n = _MODS.named.classname(inst) 

191 n = _DOT_(n, self.name) 

192 n = _EQUALSPACED_(n, repr(val)) 

193 raise self._Error(_immutable_, n, None) 

194 

195 def _update(self, inst, *unused): 

196 '''(INTERNAL) Zap the I{cached/memoized} C{inst.__dict__[name]} item. 

197 ''' 

198 inst.__dict__.pop(self.name, None) # name, NOT _name 

199 

200 def _update_from(self, inst, other): 

201 '''(INTERNAL) Copy a I{cached/memoized} C{inst.__dict__[name]} item 

202 from C{other.__dict__[name]} if present, otherwise zap it. 

203 ''' 

204 n = self.name # name, NOT _name 

205 v = other.__dict__.get(n, MISSING) 

206 if v is MISSING: 

207 inst.__dict__.pop(n, None) 

208 else: 

209 inst.__dict__[n] = v 

210 

211 def deleter(self, fdel): 

212 '''Throws an C{AttributeError}, always. 

213 ''' 

214 raise self._Error(_invalid_, self.deleter, fdel) 

215 

216 def getter(self, fget): 

217 '''Throws an C{AttributeError}, always. 

218 ''' 

219 raise self._Error(_invalid_, self.getter, fget) 

220 

221 def setter(self, fset): 

222 '''Throws an C{AttributeError}, always. 

223 ''' 

224 raise self._Error(_immutable_, self.setter, fset) 

225 

226 def _Error(self, kind, nameter, farg): 

227 '''(INTERNAL) Return an C{AttributeError} instance. 

228 ''' 

229 if farg: 

230 n = _DOT_(self.name, nameter.__name__) 

231 n = _SPACE_(n, farg.__name__) 

232 else: 

233 n = nameter 

234 e = _SPACE_(kind, _MODS.named.classname(self)) 

235 return _AttributeError(e, txt=n) 

236 

237 

238class Property_RO(_PropertyBase): 

239 # No __doc__ on purpose 

240 def __init__(self, method, doc=NN): # PYCHOK expected 

241 '''New I{immutable}, I{caching}, I{memoizing} C{property} I{Factory} 

242 to be used as C{decorator}. 

243 

244 @arg method: The callable being decorated as this C{property}'s C{getter}, 

245 to be invoked only once. 

246 @kwarg doc: Optional property documentation (C{str}). 

247 

248 @note: Like standard Python C{property} without a C{setter}, but with 

249 a more descriptive error message when set. 

250 

251 @see: Python 3's U{functools.cached_property<https://docs.Python.org/3/ 

252 library/functools.html#functools.cached_property>} and U{-.cache 

253 <https://Docs.Python.org/3/library/functools.html#functools.cache>} 

254 to I{cache} or I{memoize} the property value. 

255 

256 @see: Luciano Ramalho, "Fluent Python", page 636, O'Reilly, Example 

257 19-24, 2016 p. 636 or Example 22-28, 2022 p. 869+ and U{class 

258 Property<https://docs.Python.org/3/howto/descriptor.html>}. 

259 ''' 

260 _fget = method if _FOR_DOCS else self._fget # XXX force method.__doc__ to epydoc 

261 _PropertyBase.__init__(self, method, _fget, self._fset_error) 

262 

263 def __get__(self, inst, *unused): # PYCHOK 2 vs 3 args 

264 if inst is None: 

265 return self 

266 try: # to get the cached value immediately 

267 return inst.__dict__[self.name] 

268 except (AttributeError, KeyError): 

269 return self._fget(inst) 

270 

271 

272class Property(Property_RO): 

273 # No __doc__ on purpose 

274 __init__ = Property_RO.__init__ 

275 '''New I{mutable}, I{caching}, I{memoizing} C{property} I{Factory} 

276 to be used as C{decorator}. 

277 

278 @see: L{Property_RO} for more details. 

279 

280 @note: Unless and until the C{setter} is defined, this L{Property} behaves 

281 like an I{immutable}, I{caching}, I{memoizing} L{Property_RO}. 

282 ''' 

283 

284 def setter(self, method): 

285 '''Make this C{Property} I{mutable}. 

286 

287 @arg method: The callable being decorated as this C{Property}'s C{setter}. 

288 

289 @note: Setting a new property value always clears the previously I{cached} 

290 or I{memoized} value I{after} invoking the B{C{method}}. 

291 ''' 

292 if not callable(method): 

293 _PropertyBase.setter(self, method) # PYCHOK no cover 

294 

295 if _FOR_DOCS: # XXX force method.__doc__ into epydoc 

296 _PropertyBase.__init__(self, self.method, self.method, method) 

297 else: 

298 

299 def _fset(inst, val): 

300 '''Set and I{cache}, I{memoize} the C{property} value. 

301 ''' 

302 method(inst, val) 

303 self._update(inst) # un-cache this item 

304 

305 # class Property <https://docs.Python.org/3/howto/descriptor.html> 

306 _PropertyBase.__init__(self, self.method, self._fget, _fset) 

307 return self 

308 

309 

310class property_RO(_PropertyBase): 

311 # No __doc__ on purpose 

312 _uname = NN 

313 

314 def __init__(self, method, doc=NN): # PYCHOK expected 

315 '''New I{immutable}, standard C{property} to be used as C{decorator}. 

316 

317 @arg method: The callable being decorated as C{property}'s C{getter}. 

318 @kwarg doc: Optional property documentation (C{str}). 

319 

320 @note: Like standard Python C{property} without a setter, but with 

321 a more descriptive error message when set. 

322 

323 @see: L{Property_RO}. 

324 ''' 

325 _PropertyBase.__init__(self, method, method, self._fset_error, doc=doc) 

326 self._uname = NN(_UNDER_, self.name) # actual attr UNDER<name> 

327 

328 def _update(self, inst, *Clas): # PYCHOK signature 

329 '''(INTERNAL) Zap the I{cached} C{B{inst}.__dict__[_name]} item. 

330 ''' 

331 uname = self._uname 

332 if uname in inst.__dict__: 

333 if Clas: # overrides inst.__class__ 

334 d = Clas[0].__dict__.get(uname, MISSING) 

335 else: 

336 d = getattr(inst.__class__, uname, MISSING) 

337# if d is MISSING: # XXX superfluous 

338# for c in inst.__class__.__mro__[:-1]: 

339# if uname in c.__dict__: 

340# d = c.__dict__[uname] 

341# break 

342 if d is None: # remove inst value 

343 inst.__dict__.pop(uname) 

344 

345 

346class _NamedProperty(property): 

347 '''Class C{property} with retrievable name. 

348 ''' 

349 @Property_RO 

350 def name(self): 

351 '''Get the name of this C{property} (C{str}). 

352 ''' 

353 return self.fget.__name__ 

354 

355 

356def property_doc_(doc): 

357 '''Decorator for a standard C{property} with basic documentation. 

358 

359 @arg doc: The property documentation (C{str}). 

360 

361 @example: 

362 

363 >>> @property_doc_("documentation text.") 

364 >>> def name(self): 

365 >>> ... 

366 >>> 

367 >>> @name.setter 

368 >>> def name(self, value): 

369 >>> ... 

370 ''' 

371 # See Luciano Ramalho, "Fluent Python", O'Reilly, Example 7-23, 

372 # 2016 p. 212+, 2022 p. 331+, Example 9-22 and <https:// 

373 # Python-3-Patterns-Idioms-Test.ReadTheDocs.io/en/latest/PythonDecorators.html> 

374 

375 def _documented_property(method): 

376 '''(INTERNAL) Return the documented C{property}. 

377 ''' 

378 t = _get_and_set_ if doc.startswith(_SPACE_) else NN 

379 return _NamedProperty(method, None, None, NN('Property to ', t, doc)) 

380 

381 return _documented_property 

382 

383 

384def _deprecated(call, kind, qual_d): 

385 '''(INTERNAL) Decorator for DEPRECATED functions, methods, etc. 

386 

387 @see: Brett Slatkin, "Effective Python", page 105, 2nd ed, 

388 Addison-Wesley, 2019. 

389 ''' 

390 doc = _docof(call) 

391 

392 @_wraps(call) # PYCHOK self? 

393 def _deprecated_call(*args, **kwds): 

394 if qual_d: # function 

395 q = qual_d 

396 elif args: # method 

397 q = _qualified(args[0], call.__name__) 

398 else: # PYCHOK no cover 

399 q = call.__name__ 

400 _throwarning(kind, q, doc) 

401 return call(*args, **kwds) 

402 

403 return _deprecated_call 

404 

405 

406def deprecated_class(cls_or_class): 

407 '''Use inside __new__ or __init__ of a DEPRECATED class. 

408 

409 @arg cls_or_class: The class (C{cls} or C{Class}). 

410 

411 @note: NOT a decorator! 

412 ''' 

413 if _WARNINGS_X_DEV: 

414 q = _DOT_(cls_or_class.__module__, cls_or_class.__name__) 

415 _throwarning(_class_, q, cls_or_class.__doc__) 

416 

417 

418def deprecated_function(call): 

419 '''Decorator for a DEPRECATED function. 

420 

421 @arg call: The deprecated function (C{callable}). 

422 

423 @return: The B{C{call}} DEPRECATED. 

424 ''' 

425 return _deprecated(call, _function_, _DOT_( 

426 call.__module__, call.__name__)) if \ 

427 _WARNINGS_X_DEV else call 

428 

429 

430def deprecated_method(call): 

431 '''Decorator for a DEPRECATED method. 

432 

433 @arg call: The deprecated method (C{callable}). 

434 

435 @return: The B{C{call}} DEPRECATED. 

436 ''' 

437 return _deprecated(call, _method_, NN) if _WARNINGS_X_DEV else call 

438 

439 

440def _deprecated_module(name): # PYCHOK no cover 

441 '''(INTERNAL) Callable within a DEPRECATED module. 

442 ''' 

443 if _WARNINGS_X_DEV: 

444 _throwarning(_module_, name, _dont_use_) 

445 

446 

447if _WARNINGS_X_DEV: 

448 class deprecated_property(_PropertyBase): 

449 '''Decorator for a DEPRECATED C{property} or C{Property}. 

450 ''' 

451 def __init__(self, method): 

452 '''Decorator for a DEPRECATED C{property} or C{Property} getter. 

453 ''' 

454 doc = _docof(method) 

455 

456 def _fget(inst): # PYCHOK no cover 

457 '''Get the C{property} or C{Property} value. 

458 ''' 

459 q = _qualified(inst, self.name) 

460 _throwarning(property.__name__, q, doc) 

461 return self.method(inst) # == method 

462 

463 _PropertyBase.__init__(self, method, _fget, None, doc=doc) 

464 

465 def setter(self, method): 

466 '''Decorator for a DEPRECATED C{property} or C{Property} setter. 

467 

468 @arg method: The callable being decorated as this C{Property}'s C{setter}. 

469 

470 @note: Setting a new property value always clears the previously I{cached} 

471 or I{memoized} value I{after} invoking the B{C{method}}. 

472 ''' 

473 if not callable(method): 

474 _PropertyBase.setter(self, method) # PYCHOK no cover 

475 

476 if _FOR_DOCS: # XXX force method.__doc__ into epydoc 

477 _PropertyBase.__init__(self, self.method, self.method, method) 

478 else: 

479 

480 def _fset(inst, val): 

481 '''Set the C{property} or C{Property} value. 

482 ''' 

483 q = _qualified(inst, self.name) 

484 _throwarning(property.__name__, q, _docof(method)) 

485 method(inst, val) 

486 # self._update(inst) # un-cache this item 

487 

488 # class Property <https://docs.Python.org/3/howto/descriptor.html> 

489 _PropertyBase.__init__(self, self.method, self._fget, _fset) 

490 return self 

491 

492else: # PYCHOK no cover 

493 class deprecated_property(property): # PYCHOK expected 

494 '''Decorator for a DEPRECATED C{property} or C{Property}. 

495 ''' 

496 pass 

497 

498deprecated_Property = deprecated_property 

499 

500 

501def deprecated_Property_RO(method): 

502 '''Decorator for a DEPRECATED L{Property_RO}. 

503 

504 @arg method: The C{Property_RO.fget} method (C{callable}). 

505 

506 @return: The B{C{method}} DEPRECATED. 

507 ''' 

508 return _deprecated_RO(method, Property_RO) 

509 

510 

511def deprecated_property_RO(method): 

512 '''Decorator for a DEPRECATED L{property_RO}. 

513 

514 @arg method: The C{property_RO.fget} method (C{callable}). 

515 

516 @return: The B{C{method}} DEPRECATED. 

517 ''' 

518 return _deprecated_RO(method, property_RO) 

519 

520 

521def _deprecated_RO(method, _RO): 

522 '''(INTERNAL) Create a DEPRECATED C{property_RO} or C{Property_RO}. 

523 ''' 

524 doc = _docof(method) 

525 

526 if _WARNINGS_X_DEV: 

527 

528 class _Deprecated_RO(_PropertyBase): 

529 __doc__ = doc 

530 

531 def __init__(self, method): 

532 _PropertyBase.__init__(self, method, self._fget, self._fset_error, doc=doc) 

533 

534 def _fget(self, inst): # PYCHOK no cover 

535 q = _qualified(inst, self.name) 

536 _throwarning(_RO.__name__, q, doc) 

537 return self.method(inst) 

538 

539 return _Deprecated_RO(method) 

540 else: # PYCHOK no cover 

541 return _RO(method, doc=doc) 

542 

543 

544def _docof(obj): 

545 '''(INTERNAL) Get uniform DEPRECATED __doc__ string. 

546 ''' 

547 try: 

548 d = obj.__doc__.strip() 

549 i = d.find(_DEPRECATED_) 

550 except AttributeError: 

551 i = -1 

552 return _DOT_(_DEPRECATED_, NN) if i < 0 else d[i:] 

553 

554 

555def _qualified(inst, name): 

556 '''(INTERNAL) Fully qualify a name. 

557 ''' 

558 # _DOT_(inst.classname, name), not _DOT_(inst.named4, name) 

559 c = inst.__class__ 

560 q = _DOT_(c.__module__, c.__name__, name) 

561 return q 

562 

563 

564class DeprecationWarnings(object): 

565 '''(INTERNAL) Handle C{DeprecationWaring}s. 

566 ''' 

567 _Warnings = 0 

568 

569 def __call__(self): # for backward compatibility 

570 '''Have any C{DeprecationWarning}s been reported or raised? 

571 

572 @return: The number of C{DeprecationWarning}s (C{int}) so 

573 far or C{None} if not enabled. 

574 

575 @note: To get C{DeprecationWarning}s if any, run C{python} 

576 with env var C{PYGEODESY_WARNINGS} set to a non-empty 

577 string I{AND} use C{python[3]} command line option 

578 C{-X dev}, C{-W always} or C{-W error}, etc. 

579 ''' 

580 return self.Warnings 

581 

582 def throw(self, kind, name, doc, **stacklevel): # stacklevel=3 

583 '''Report or raise a C{DeprecationWarning}. 

584 ''' 

585 line = doc.split(_DNL_, 1)[0].strip() 

586 name = _MODS.streprs.Fmt.CURLY(L=name) 

587 text = _SPACE_(kind, name, _has_been_, *line.split()) 

588 kwds = _xkwds(stacklevel, stacklevel=3) 

589 # XXX invoke warn or raise DeprecationWarning(text) 

590 self._warn(text, category=DeprecationWarning, **kwds) 

591 self._Warnings += 1 

592 

593 @Property_RO 

594 def _warn(self): 

595 '''Get Python's C{warnings.warn}. 

596 ''' 

597 from warnings import warn 

598 return warn 

599 

600 @property_RO 

601 def Warnings(self): 

602 '''Get the number of C{DeprecationWarning}s (C{int}) so 

603 far or C{None} if not enabled. 

604 ''' 

605 return self._Warnings if _WARNINGS_X_DEV else None 

606 

607DeprecationWarnings = DeprecationWarnings() # PYCHOK singleton 

608_throwarning = DeprecationWarnings.throw 

609 

610# **) MIT License 

611# 

612# Copyright (C) 2016-2023 -- mrJean1 at Gmail -- All Rights Reserved. 

613# 

614# Permission is hereby granted, free of charge, to any person obtaining a 

615# copy of this software and associated documentation files (the "Software"), 

616# to deal in the Software without restriction, including without limitation 

617# the rights to use, copy, modify, merge, publish, distribute, sublicense, 

618# and/or sell copies of the Software, and to permit persons to whom the 

619# Software is furnished to do so, subject to the following conditions: 

620# 

621# The above copyright notice and this permission notice shall be included 

622# in all copies or substantial portions of the Software. 

623# 

624# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 

625# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 

626# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 

627# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 

628# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 

629# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 

630# OTHER DEALINGS IN THE SOFTWARE.