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 

13from pygeodesy.basics import isclass as _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__ = '24.03.06' 

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 

76# def _isclass(obj): 

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

78# ''' 

79# _MODS.getmodule(__name__)._isclass = f = _MODS.basics.isclass 

80# return f(obj) 

81 

82 

83def _update_all(inst, *attrs, **Base_needed): 

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

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

86 

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

88 ''' 

89 if _isclass(inst): 

90 raise _AssertionError(inst, txt=_not_an_inst_) 

91 try: 

92 d = inst.__dict__ 

93 except AttributeError: 

94 return 0 

95 u = len(d) 

96 if u > _xkwds_get(Base_needed, needed=0): 

97 B = _xkwds_get(Base_needed, Base=_PropertyBase) 

98 for p in _allPropertiesOf(inst, B): 

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

100 

101 if attrs: 

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

103 u -= len(d) 

104 return u # updates 

105 

106 

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

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

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

110# 

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

112# ''' 

113# if _isclass(inst): 

114# raise _AssertionError(inst, txt=_not_an_inst_) 

115# try: 

116# d = inst.__dict__ 

117# f = other.__dict__ 

118# except AttributeError: 

119# return 0 

120# u = len(f) 

121# if u: 

122# u = len(d) 

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

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

125# p._update_from(inst, other) 

126# u -= len(d) 

127# return u # number of updates 

128 

129 

130def _update_attrs(inst, *attrs): 

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

132 

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

134 ''' 

135 try: 

136 d = inst.__dict__ 

137 except AttributeError: 

138 return 0 

139 u = len(d) 

140 if u: # zap attrs from inst.__dict__ 

141 _p = d.pop 

142 for a in attrs: 

143 _ = _p(a, MISSING) 

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

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

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

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

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

149 u -= len(d) 

150 # assert u >= 0 

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

152 

153 

154class _PropertyBase(property): 

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

156 ''' 

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

158 

159 if not callable(method): 

160 self.getter(method) # PYCHOK no cover 

161 

162 self.method = method 

163 self.name = method.__name__ 

164 d = doc or method.__doc__ 

165 if _FOR_DOCS and d: 

166 self.__doc__ = d # PYCHOK no cover 

167 

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

169 

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

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

172 ''' 

173 if farg: 

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

175 n = _SPACE_(n, farg.__name__) 

176 else: 

177 n = nameter 

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

179 return _AttributeError(e, txt=n) 

180 

181 def _fdel(self, inst): 

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

183 ''' 

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

185 

186 def _fget(self, inst): 

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

188 ''' 

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

190 return inst.__dict__[self.name] 

191 except KeyError: 

192 # cache the value in the instance' __dict__ 

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

194 return val 

195 

196 def _fset_error(self, inst, val): 

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

198 ''' 

199 n = _MODS.named.classname(inst) 

200 n = _DOT_(n, self.name) 

201 n = _EQUALSPACED_(n, repr(val)) 

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

203 

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

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

206 ''' 

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

208 

209 def _update_from(self, inst, other): 

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

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

212 ''' 

213 n = self.name # name, NOT _name 

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

215 if v is MISSING: 

216 inst.__dict__.pop(n, None) 

217 else: 

218 inst.__dict__[n] = v 

219 

220 def deleter(self, fdel): 

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

222 ''' 

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

224 

225 def getter(self, fget): 

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

227 ''' 

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

229 

230 def setter(self, fset): 

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

232 ''' 

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

234 

235 

236class Property_RO(_PropertyBase): 

237 # No __doc__ on purpose 

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

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

240 to be used as C{decorator}. 

241 

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

243 to be invoked only once. 

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

245 

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

247 a more descriptive error message when set. 

248 

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

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

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

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

253 

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

255 19-24, 2016 p. 636 or Example 22-28, 2022 p. 869+ and U{class 

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

257 ''' 

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

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

260 

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

262 if inst is None: 

263 return self 

264 try: # to get the cached value immediately 

265 return inst.__dict__[self.name] 

266 except (AttributeError, KeyError): 

267 return self._fget(inst) 

268 

269 

270class Property(Property_RO): 

271 # No __doc__ on purpose 

272 __init__ = Property_RO.__init__ 

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

274 to be used as C{decorator}. 

275 

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

277 

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

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

280 ''' 

281 

282 def setter(self, method): 

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

284 

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

286 

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

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

289 ''' 

290 if not callable(method): 

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

292 

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

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

295 else: 

296 

297 def _fset(inst, val): 

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

299 ''' 

300 method(inst, val) 

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

302 

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

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

305 return self 

306 

307 

308class property_RO(_PropertyBase): 

309 # No __doc__ on purpose 

310 _uname = NN 

311 

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

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

314 

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

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

317 

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

319 a more descriptive error message when set. 

320 

321 @see: L{Property_RO}. 

322 ''' 

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

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

325 

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

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

328 ''' 

329 uname = self._uname 

330 if uname in inst.__dict__: 

331 if Clas: # overrides inst.__class__ 

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

333 else: 

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

335# if d is MISSING: # XXX superfluous 

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

337# if uname in c.__dict__: 

338# d = c.__dict__[uname] 

339# break 

340 if d is None: # remove inst value 

341 inst.__dict__.pop(uname) 

342 

343 

344class _NamedProperty(property): 

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

346 ''' 

347 @Property_RO 

348 def name(self): 

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

350 ''' 

351 return self.fget.__name__ 

352 

353 

354def property_doc_(doc): 

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

356 

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

358 

359 @example: 

360 

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

362 >>> def name(self): 

363 >>> ... 

364 >>> 

365 >>> @name.setter 

366 >>> def name(self, value): 

367 >>> ... 

368 ''' 

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

370 # 2016 p. 212+, 2022 p. 331+, Example 9-22 and <https:// 

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

372 

373 def _documented_property(method): 

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

375 ''' 

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

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

378 

379 return _documented_property 

380 

381 

382def _deprecated(call, kind, qual_d): 

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

384 

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

386 Addison-Wesley, 2019. 

387 ''' 

388 doc = _docof(call) 

389 

390 @_wraps(call) # PYCHOK self? 

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

392 if qual_d: # function 

393 q = qual_d 

394 elif args: # method 

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

396 else: # PYCHOK no cover 

397 q = call.__name__ 

398 _throwarning(kind, q, doc) 

399 return call(*args, **kwds) 

400 

401 return _deprecated_call 

402 

403 

404def deprecated_class(cls_or_class): 

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

406 

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

408 

409 @note: NOT a decorator! 

410 ''' 

411 if _WARNINGS_X_DEV: 

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

413 _throwarning(_class_, q, cls_or_class.__doc__) 

414 

415 

416def deprecated_function(call): 

417 '''Decorator for a DEPRECATED function. 

418 

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

420 

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

422 ''' 

423 return _deprecated(call, _function_, _DOT_( 

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

425 _WARNINGS_X_DEV else call 

426 

427 

428def deprecated_method(call): 

429 '''Decorator for a DEPRECATED method. 

430 

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

432 

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

434 ''' 

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

436 

437 

438def _deprecated_module(name): # PYCHOK no cover 

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

440 ''' 

441 if _WARNINGS_X_DEV: 

442 _throwarning(_module_, name, _dont_use_) 

443 

444 

445if _WARNINGS_X_DEV: 

446 class deprecated_property(_PropertyBase): 

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

448 ''' 

449 def __init__(self, method): 

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

451 ''' 

452 doc = _docof(method) 

453 

454 def _fget(inst): # PYCHOK no cover 

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

456 ''' 

457 q = _qualified(inst, self.name) 

458 _throwarning(property.__name__, q, doc) 

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

460 

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

462 

463 def setter(self, method): 

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

465 

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

467 

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

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

470 ''' 

471 if not callable(method): 

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

473 

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

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

476 else: 

477 

478 def _fset(inst, val): 

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

480 ''' 

481 q = _qualified(inst, self.name) 

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

483 method(inst, val) 

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

485 

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

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

488 return self 

489 

490else: # PYCHOK no cover 

491 class deprecated_property(property): # PYCHOK expected 

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

493 ''' 

494 pass 

495 

496deprecated_Property = deprecated_property 

497 

498 

499def deprecated_Property_RO(method): 

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

501 

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

503 

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

505 ''' 

506 return _deprecated_RO(method, Property_RO) 

507 

508 

509def deprecated_property_RO(method): 

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

511 

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

513 

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

515 ''' 

516 return _deprecated_RO(method, property_RO) 

517 

518 

519def _deprecated_RO(method, _RO): 

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

521 ''' 

522 doc = _docof(method) 

523 

524 if _WARNINGS_X_DEV: 

525 

526 class _Deprecated_RO(_PropertyBase): 

527 __doc__ = doc 

528 

529 def __init__(self, method): 

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

531 

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

533 q = _qualified(inst, self.name) 

534 _throwarning(_RO.__name__, q, doc) 

535 return self.method(inst) 

536 

537 return _Deprecated_RO(method) 

538 else: # PYCHOK no cover 

539 return _RO(method, doc=doc) 

540 

541 

542def _docof(obj): 

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

544 ''' 

545 try: 

546 d = obj.__doc__.strip() 

547 i = d.find(_DEPRECATED_) 

548 except AttributeError: 

549 i = -1 

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

551 

552 

553def _qualified(inst, name): 

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

555 ''' 

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

557 c = inst.__class__ 

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

559 return q 

560 

561 

562class DeprecationWarnings(object): 

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

564 ''' 

565 _Warnings = 0 

566 

567 def __call__(self): # for backward compatibility 

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

569 

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

571 far or C{None} if not enabled. 

572 

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

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

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

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

577 ''' 

578 return self.Warnings 

579 

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

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

582 ''' 

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

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

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

586 kwds = _xkwds(stacklevel, stacklevel=3) 

587 # XXX invoke warn or raise DeprecationWarning(text) 

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

589 self._Warnings += 1 

590 

591 @Property_RO 

592 def _warn(self): 

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

594 ''' 

595 from warnings import warn 

596 return warn 

597 

598 @property_RO 

599 def Warnings(self): 

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

601 far or C{None} if not enabled. 

602 ''' 

603 return self._Warnings if _WARNINGS_X_DEV else None 

604 

605DeprecationWarnings = DeprecationWarnings() # PYCHOK singleton 

606_throwarning = DeprecationWarnings.throw 

607 

608# **) MIT License 

609# 

610# Copyright (C) 2016-2024 -- mrJean1 at Gmail -- All Rights Reserved. 

611# 

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

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

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

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

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

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

618# 

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

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

621# 

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

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

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

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

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

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

628# OTHER DEALINGS IN THE SOFTWARE.