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__ = '24.05.12' 

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, **excls): 

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

41 as specified in the C{Bases} arguments, except C{excls}. 

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 _isa = isinstance 

53 for C in S: 

54 for n, p in C.__dict__.items(): 

55 if _isa(p, B) and p.name == n and n not in excls: 

56 yield p 

57 

58 

59def _allPropertiesOf_n(n, Clas_or_inst, *Bases, **excls): 

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

61 ''' 

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

63 if len(t) != n: 

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

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

66 return t 

67 

68 

69def _hasProperty(inst, name, *Classes): # in .named._NamedBase._update 

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

71 ''' 

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

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

74 and p.name == name) 

75 

76 

77# def _isclass(obj): 

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

79# ''' 

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

81# return f(obj) 

82 

83 

84def _update_all(inst, *attrs, **Base_needed): 

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

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

87 

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

89 ''' 

90 if _isclass(inst): 

91 raise _AssertionError(inst, txt=_not_an_inst_) 

92 try: 

93 d = inst.__dict__ 

94 except AttributeError: 

95 return 0 

96 u = len(d) 

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

98 B = _xkwds_get(Base_needed, Base=_PropertyBase) 

99 for p in _allPropertiesOf(inst, B): 

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

101 

102 if attrs: 

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

104 u -= len(d) 

105 return u # updates 

106 

107 

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

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

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

111# 

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

113# ''' 

114# if _isclass(inst): 

115# raise _AssertionError(inst, txt=_not_an_inst_) 

116# try: 

117# d = inst.__dict__ 

118# f = other.__dict__ 

119# except AttributeError: 

120# return 0 

121# u = len(f) 

122# if u: 

123# u = len(d) 

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

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

126# p._update_from(inst, other) 

127# u -= len(d) 

128# return u # number of updates 

129 

130 

131def _update_attrs(inst, *attrs): 

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

133 

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

135 ''' 

136 try: 

137 d = inst.__dict__ 

138 except AttributeError: 

139 return 0 

140 u = len(d) 

141 if u: # zap attrs from inst.__dict__ 

142 _p = d.pop 

143 for a in attrs: 

144 _ = _p(a, MISSING) 

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

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

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

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

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

150 u -= len(d) 

151 # assert u >= 0 

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

153 

154 

155class _PropertyBase(property): 

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

157 ''' 

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

159 

160 if not callable(method): 

161 self.getter(method) # PYCHOK no cover 

162 

163 self.method = method 

164 self.name = method.__name__ 

165 d = doc or method.__doc__ 

166 if _FOR_DOCS and d: 

167 self.__doc__ = d # PYCHOK no cover 

168 

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

170 

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

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

173 ''' 

174 if farg: 

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

176 n = _SPACE_(n, farg.__name__) 

177 else: 

178 n = nameter 

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

180 return _AttributeError(e, txt=n) 

181 

182 def _fdel(self, inst): 

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

184 ''' 

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

186 

187 def _fget(self, inst): 

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

189 ''' 

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

191 return inst.__dict__[self.name] 

192 except KeyError: 

193 # cache the value in the instance' __dict__ 

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

195 return val 

196 

197 def _fset_error(self, inst, val): 

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

199 ''' 

200 n = _MODS.named.classname(inst) 

201 n = _DOT_(n, self.name) 

202 n = _EQUALSPACED_(n, repr(val)) 

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

204 

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

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

207 ''' 

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

209 

210 def _update_from(self, inst, other): 

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

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

213 ''' 

214 n = self.name # name, NOT _name 

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

216 if v is MISSING: 

217 inst.__dict__.pop(n, None) 

218 else: 

219 inst.__dict__[n] = v 

220 

221 def deleter(self, fdel): 

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

223 ''' 

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

225 

226 def getter(self, fget): 

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

228 ''' 

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

230 

231 def setter(self, fset): 

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

233 ''' 

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

235 

236 

237class Property_RO(_PropertyBase): 

238 # No __doc__ on purpose 

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

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

241 to be used as C{decorator}. 

242 

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

244 to be invoked only once. 

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

246 

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

248 a more descriptive error message when set. 

249 

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

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

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

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

254 

255 @see: Luciano Ramalho, "Fluent Python", O'Reilly, Example 19-24, 2016 

256 p. 636 or Example 22-28, 2022 p. 870 and U{class Property 

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

258 ''' 

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

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

261 

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

263 if inst is None: 

264 return self 

265 try: # to get the cached value immediately 

266 return inst.__dict__[self.name] 

267 except (AttributeError, KeyError): 

268 return self._fget(inst) 

269 

270 

271class Property(Property_RO): 

272 # No __doc__ on purpose 

273 __init__ = Property_RO.__init__ 

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

275 to be used as C{decorator}. 

276 

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

278 

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

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

281 ''' 

282 

283 def setter(self, method): 

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

285 

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

287 

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

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

290 ''' 

291 if not callable(method): 

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

293 

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

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

296 else: 

297 

298 def _fset(inst, val): 

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

300 ''' 

301 method(inst, val) 

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

303 

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

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

306 return self 

307 

308 

309class property_RO(_PropertyBase): 

310 # No __doc__ on purpose 

311 _uname = NN 

312 

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

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

315 

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

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

318 

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

320 a more descriptive error message when set. 

321 

322 @see: L{Property_RO}. 

323 ''' 

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

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

326 

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

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

329 ''' 

330 uname = self._uname 

331 if uname in inst.__dict__: 

332 if Clas: # overrides inst.__class__ 

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

334 else: 

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

336# if d is MISSING: # XXX superfluous 

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

338# if uname in c.__dict__: 

339# d = c.__dict__[uname] 

340# break 

341 if d is None: # remove inst value 

342 inst.__dict__.pop(uname) 

343 

344 

345class _NamedProperty(property): 

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

347 ''' 

348 @Property_RO 

349 def name(self): 

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

351 ''' 

352 return self.fget.__name__ 

353 

354 

355def property_doc_(doc): 

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

357 

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

359 

360 @example: 

361 

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

363 >>> def name(self): 

364 >>> ... 

365 >>> 

366 >>> @name.setter 

367 >>> def name(self, value): 

368 >>> ... 

369 ''' 

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

371 # 2016 p. 212+, 2022 p. 331+, Example 9-22 and <https:// 

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

373 

374 def _documented_property(method): 

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

376 ''' 

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

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

379 

380 return _documented_property 

381 

382 

383def _deprecated(call, kind, qual_d): 

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

385 

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

387 Addison-Wesley, 2019. 

388 ''' 

389 doc = _docof(call) 

390 

391 @_wraps(call) # PYCHOK self? 

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

393 if qual_d: # function 

394 q = qual_d 

395 elif args: # method 

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

397 else: # PYCHOK no cover 

398 q = call.__name__ 

399 _throwarning(kind, q, doc) 

400 return call(*args, **kwds) 

401 

402 return _deprecated_call 

403 

404 

405def deprecated_class(cls_or_class): 

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

407 

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

409 

410 @note: NOT a decorator! 

411 ''' 

412 if _WARNINGS_X_DEV: 

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

414 _throwarning(_class_, q, cls_or_class.__doc__) 

415 

416 

417def deprecated_function(call): 

418 '''Decorator for a DEPRECATED function. 

419 

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

421 

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

423 ''' 

424 return _deprecated(call, _function_, _DOT_( 

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

426 _WARNINGS_X_DEV else call 

427 

428 

429def deprecated_method(call): 

430 '''Decorator for a DEPRECATED method. 

431 

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

433 

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

435 ''' 

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

437 

438 

439def _deprecated_module(name): # PYCHOK no cover 

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

441 ''' 

442 if _WARNINGS_X_DEV: 

443 _throwarning(_module_, name, _dont_use_) 

444 

445 

446if _WARNINGS_X_DEV: 

447 class deprecated_property(_PropertyBase): 

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

449 ''' 

450 def __init__(self, method): 

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

452 ''' 

453 doc = _docof(method) 

454 

455 def _fget(inst): # PYCHOK no cover 

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

457 ''' 

458 q = _qualified(inst, self.name) 

459 _throwarning(property.__name__, q, doc) 

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

461 

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

463 

464 def setter(self, method): 

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

466 

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

468 

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

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

471 ''' 

472 if not callable(method): 

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

474 

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

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

477 else: 

478 

479 def _fset(inst, val): 

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

481 ''' 

482 q = _qualified(inst, self.name) 

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

484 method(inst, val) 

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

486 

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

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

489 return self 

490 

491else: # PYCHOK no cover 

492 class deprecated_property(property): # PYCHOK expected 

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

494 ''' 

495 pass 

496 

497deprecated_Property = deprecated_property 

498 

499 

500def deprecated_Property_RO(method): 

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

502 

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

504 

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

506 ''' 

507 return _deprecated_RO(method, Property_RO) 

508 

509 

510def deprecated_property_RO(method): 

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

512 

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

514 

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

516 ''' 

517 return _deprecated_RO(method, property_RO) 

518 

519 

520def _deprecated_RO(method, _RO): 

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

522 ''' 

523 doc = _docof(method) 

524 

525 if _WARNINGS_X_DEV: 

526 

527 class _Deprecated_RO(_PropertyBase): 

528 __doc__ = doc 

529 

530 def __init__(self, method): 

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

532 

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

534 q = _qualified(inst, self.name) 

535 _throwarning(_RO.__name__, q, doc) 

536 return self.method(inst) 

537 

538 return _Deprecated_RO(method) 

539 else: # PYCHOK no cover 

540 return _RO(method, doc=doc) 

541 

542 

543def _docof(obj): 

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

545 ''' 

546 try: 

547 d = obj.__doc__.strip() 

548 i = d.find(_DEPRECATED_) 

549 except AttributeError: 

550 i = -1 

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

552 

553 

554def _qualified(inst, name): 

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

556 ''' 

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

558 c = inst.__class__ 

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

560 return q 

561 

562 

563class DeprecationWarnings(object): 

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

565 ''' 

566 _Warnings = 0 

567 

568 def __call__(self): # for backward compatibility 

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

570 

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

572 far or C{None} if not enabled. 

573 

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

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

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

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

578 ''' 

579 return self.Warnings 

580 

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

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

583 ''' 

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

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

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

587 kwds = _xkwds(stacklevel, stacklevel=3) 

588 # XXX invoke warn or raise DeprecationWarning(text) 

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

590 self._Warnings += 1 

591 

592 @Property_RO 

593 def _warn(self): 

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

595 ''' 

596 from warnings import warn 

597 return warn 

598 

599 @property_RO 

600 def Warnings(self): 

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

602 far or C{None} if not enabled. 

603 ''' 

604 return self._Warnings if _WARNINGS_X_DEV else None 

605 

606DeprecationWarnings = DeprecationWarnings() # PYCHOK singleton 

607_throwarning = DeprecationWarnings.throw 

608 

609# **) MIT License 

610# 

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

612# 

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

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

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

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

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

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

619# 

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

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

622# 

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

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

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

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

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

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