1

2# -*- coding: utf-8 -*-

3

4 u'''Errors, exceptions, exception formatting and exception chaining.

5

6 Error, exception classes and functions to format PyGeodesy errors,

7 including the setting of I{exception chaining} in Python 3+.

8

9 By default, I{exception chaining} is turned I{off}. To enable I{exception

10 chaining}, use command line option C{python -X dev} I{OR} set env variable

11 C{PYTHONDEVMODE=1} or to any non-empyty string I{OR} set env variable

12 C{PYGEODESY_EXCEPTION_CHAINING=std} or to any non-empty string.

13'''

14

15 from pygeodesy.interns import MISSING, NN, _a_, _an_, _and_, _clip_, \

16 _COLON_, _COLONSPACE_, _COMMASPACE_, _datum_, \

17 _ellipsoidal_, _EQUAL_, _incompatible_, _invalid_, \

18 _len_, _name_, _no_, _not_, _or_, _SPACE_, \

19 _specified_, _UNDER_, _value_, _vs_, _with_

20 from pygeodesy.lazily import _ALL_LAZY, _ALL_MODS as _MODS, _getenv, \

21 _pairs, _PYTHON_X_DEV

22

23__all__ = _ALL_LAZY.errors # _ALL_DOCS('_InvalidError', '_IsnotError') _under

24__version__ = '23.08.05'

25

26_box_ = 'box'

27_default_ = 'default'

28_kwargs_ = 'kwargs' # XXX _kwds_?

29_limiterrors = True # imported by .formy

30_multiple_ = 'multiple'

31_name_value_ = repr('name=value')

32_rangerrors = True # imported by .dms

33_region_ = 'region'

34_vs__ = _SPACE_(NN, _vs_, NN)

35

36 try:

37 _exception_chaining = None # not available

38 _ = Exception().__cause__ # Python 3+ exception chaining

39

40 if _PYTHON_X_DEV or _getenv('PYGEODESY_EXCEPTION_CHAINING', NN): # == _std_

41 _exception_chaining = True # turned on, std

42 raise AttributeError # allow exception chaining

43

44 _exception_chaining = False # turned off

45

46 def _error_cause(inst, cause=None):

47 '''(INTERNAL) Set or avoid Python 3+ exception chaining.

48

49 Setting C{inst.__cause__ = None} is equivalent to syntax

50 C{raise Error(...) from None} to avoid exception chaining.

51

52 @arg inst: An error instance (I{caught} C{Exception}).

53 @kwarg cause: A previous error instance (I{caught} C{Exception})

54 or C{None} to avoid exception chaining.

55

56 @see: Alex Martelli, et.al., "Python in a Nutshell", 3rd Ed., page 163,

57 O'Reilly, 2017, U{PEP-3134<https://www.Python.org/dev/peps/pep-3134>},

58 U{here<https://StackOverflow.com/questions/17091520/how-can-i-more-

59 easily-suppress-previous-exceptions-when-i-raise-my-own-exception>}

60 and U{here<https://StackOverflow.com/questions/1350671/

61 inner-exception-with-traceback-in-python>}.

62 '''

63 inst.__cause__ = cause # None, no exception chaining

64 return inst

65

66 except AttributeError: # Python 2+

67

68 def _error_cause(inst, **unused): # PYCHOK expected

69 return inst # no-op

70

71

72 class _AssertionError(AssertionError):

73 '''(INTERNAL) Format an C{AssertionError} with/-out exception chaining.

74 '''

75 def __init__(self, *args, **kwds):

76 _error_init(AssertionError, self, args, **kwds)

77

78

79 class _AttributeError(AttributeError):

80 '''(INTERNAL) Format an C{AttributeError} with/-out exception chaining.

81 '''

82 def __init__(self, *args, **kwds):

83 _error_init(AttributeError, self, args, **kwds)

84

85

86 class _ImportError(ImportError):

87 '''(INTERNAL) Format an C{ImportError} with/-out exception chaining.

88 '''

89 def __init__(self, *args, **kwds):

90 _error_init(ImportError, self, args, **kwds)

91

92

93 class _IndexError(IndexError):

94 '''(INTERNAL) Format an C{IndexError} with/-out exception chaining.

95 '''

96 def __init__(self, *args, **kwds):

97 _error_init(IndexError, self, args, **kwds)

98

99

100 class _KeyError(KeyError):

101 '''(INTERNAL) Format a C{KeyError} with/-out exception chaining.

102 '''

103 def __init__(self, *args, **kwds): # txt=_invalid_

104 _error_init(KeyError, self, args, **kwds)

105

106

107 class _NameError(NameError):

108 '''(INTERNAL) Format a C{NameError} with/-out exception chaining.

109 '''

110 def __init__(self, *args, **kwds):

111 _error_init(NameError, self, args, **kwds)

112

113

114 class _NotImplementedError(NotImplementedError):

115 '''(INTERNAL) Format a C{NotImplementedError} with/-out exception chaining.

116 '''

117 def __init__(self, *args, **kwds):

118 _error_init(NotImplementedError, self, args, **kwds)

119

120

121 class _OverflowError(OverflowError):

122 '''(INTERNAL) Format an C{OverflowError} with/-out exception chaining.

123 '''

124 def __init__(self, *args, **kwds): # txt=_invalid_

125 _error_init(OverflowError, self, args, **kwds)

126

127

128 class _TypeError(TypeError):

129 '''(INTERNAL) Format a C{TypeError} with/-out exception chaining.

130 '''

131 def __init__(self, *args, **kwds):

132 _error_init(TypeError, self, args, fmt_name_value='type(%s) (%r)', **kwds)

133

134

135 class _TypesError(_TypeError):

136 '''(INTERNAL) Format a C{TypeError} with/-out exception chaining.

137 '''

138 def __init__(self, name, value, *Types, **kwds):

139 t = _not_(_an(_or(*(t.__name__ for t in Types))))

140 _TypeError.__init__(self, name, value, txt=t, **kwds)

141

142

143 class _ValueError(ValueError):

144 '''(INTERNAL) Format a C{ValueError} with/-out exception chaining.

145 '''

146 def __init__(self, *args, **kwds): # ..., cause=None, txt=_invalid_, ...

147 _error_init(ValueError, self, args, **kwds)

148

149

150 class _ZeroDivisionError(ZeroDivisionError):

151 '''(INTERNAL) Format a C{ZeroDivisionError} with/-out exception chaining.

152 '''

153 def __init__(self, *args, **kwds):

154 _error_init(ZeroDivisionError, self, args, **kwds)

155

156

157 class AuxError(_ValueError):

158 '''Error raised for an L{rhumbaux} C{Aux}, C{AuxDLat} or C{AuxLat} issue.

159 '''

160 pass

161

162

163 class ClipError(_ValueError):

164 '''Clip box or clip region issue.

165 '''

166 def __init__(self, *name_n_corners, **txt_cause):

167 '''New L{ClipError}.

168

169 @arg name_n_corners: Either just a name (C{str}) or

170 name, number, corners (C{str},

171 C{int}, C{tuple}).

172 @kwarg txt_cause: Optional C{B{txt}=str} explanation

173 of the error and C{B{cause}=None}

174 for exception chaining.

175 '''

176 if len(name_n_corners) == 3:

177 t, n, v = name_n_corners

178 n = _SPACE_(t, _clip_, (_box_ if n == 2 else _region_))

179 name_n_corners = n, v

180 _ValueError.__init__(self, *name_n_corners, **txt_cause)

181

182

183 class CrossError(_ValueError):

184 '''Error raised for zero or near-zero vectorial cross products,

185 occurring for coincident or colinear points, lines or bearings.

186 '''

187 pass

188

189

190 class GeodesicError(_ValueError):

191 '''Error raised for L{pygeodesy.geodesicx} lack of convergence

192 or other L{pygeodesy.geodesicx} or L{pygeodesy.karney} issues.

193 '''

194 pass

195

196

197 class IntersectionError(_ValueError): # in .ellipsoidalBaseDI, .formy, ...

198 '''Error raised for line or circle intersection issues.

199 '''

200 def __init__(self, *args, **kwds):

201 '''New L{IntersectionError}.

202 '''

203 if args:

204 _ValueError.__init__(self, _SPACE_(*args), **kwds)

205 else:

206 _ValueError.__init__(self, **kwds)

207

208

209 class LenError(_ValueError): # in .ecef, .fmath, .heights, .iters, .named

210 '''Error raised for mis-matching C{len} values.

211 '''

212 def __init__(self, where, **lens_txt): # txt=None

213 '''New L{LenError}.

214

215 @arg where: Object with C{.__name__} attribute

216 (C{class}, C{method}, or C{function}).

217 @kwarg lens_txt: Two or more C{name=len(name)} pairs

218 (C{keyword arguments}).

219 '''

220 def _ns_vs_txt_x(cause=None, txt=_invalid_, **kwds):

221 ns, vs = zip(*itemsorted(kwds)) # unzip

222 return ns, vs, txt, cause

223

224 ns, vs, txt, x = _ns_vs_txt_x(**lens_txt)

225 ns = _COMMASPACE_.join(ns)

226 t = _MODS.streprs.Fmt.PAREN(where.__name__, ns)

227 vs = _vs__.join(map(str, vs))

228 t = _SPACE_(t, _len_, vs)

229 _ValueError.__init__(self, t, txt=txt, cause=x)

230

231

232 class LimitError(_ValueError):

233 '''Error raised for lat- or longitudinal values or deltas exceeding

234 the given B{C{limit}} in functions L{pygeodesy.equirectangular},

235 L{pygeodesy.equirectangular_}, C{nearestOn*} and C{simplify*}

236 or methods with C{limit} or C{options} keyword arguments.

237

238 @see: Subclass L{UnitError}.

239 '''

240 pass

241

242

243 class MGRSError(_ValueError):

244 '''Military Grid Reference System (MGRS) parse or other L{Mgrs} issue.

245 '''

246 pass

247

248

249 class NumPyError(_ValueError):

250 '''Error raised for C{NumPy} issues.

251 '''

252 pass

253

254

255 class ParseError(_ValueError): # in .dms, .elevations, .utmupsBase

256 '''Error parsing degrees, radians or several other formats.

257 '''

258 pass

259

260

261 class PointsError(_ValueError): # in .clipy, .frechet, ...

262 '''Error for an insufficient number of points.

263 '''

264 pass

265

266

267 class RangeError(_ValueError):

268 '''Error raised for lat- or longitude values outside the B{C{clip}},

269 B{C{clipLat}}, B{C{clipLon}} in functions L{pygeodesy.parse3llh},

270 L{pygeodesy.parseDMS}, L{pygeodesy.parseDMS2} and L{pygeodesy.parseRad}

271 or the given B{C{limit}} in functions L{pygeodesy.clipDegrees} and

272 L{pygeodesy.clipRadians}.

273

274 @see: Function L{pygeodesy.rangerrors}.

275 '''

276 pass

277

278

279 class RhumbError(_ValueError):

280 '''Error raised for L{pygeodesy.rhumbaux}, L{pygeodesy.rhumbsolve}

281 or L{pygeodesy.rhumbx} issues.

282 '''

283 pass

284

285

286 class TriangleError(_ValueError): # in .resections, .vector2d

287 '''Error raised for triangle, inter- or resection issues.

288 '''

289 pass

290

291

292 class SciPyError(PointsError):

293 '''Error raised for C{SciPy} issues.

294 '''

295 pass

296

297

298 class SciPyWarning(PointsError):

299 '''Error thrown for C{SciPy} warnings.

300

301 To raise C{SciPy} warnings as L{SciPyWarning} exceptions, Python

302 C{warnings} must be filtered as U{warnings.filterwarnings('error')

303 <https://docs.Python.org/3/library/warnings.html#the-warnings-filter>}

304 I{prior to} C{import scipy} OR by setting env var U{PYTHONWARNINGS

305 <https://docs.Python.org/3/using/cmdline.html#envvar-PYTHONWARNINGS>}

306 OR by invoking C{python} with command line option U{-W<https://docs.

307 Python.org/3/using/cmdline.html#cmdoption-w>} set to C{-W error}.

308 '''

309 pass

310

311

312 class TRFError(_ValueError): # in .ellipsoidalBase, .trf, .units

313 '''Terrestrial Reference Frame (TRF), L{Epoch}, L{RefFrame}

314 or L{RefFrame} conversion issue.

315 '''

316 pass

317

318

319 class UnitError(LimitError): # in .named, .units

320 '''Default exception for L{units} issues for a value exceeding the

321 C{low} or C{high} limit.

322 '''

323 pass

324

325

326 class VectorError(_ValueError): # in .nvectorBase, .vector3d, .vector3dBase

327 '''L{Vector3d}, C{Cartesian*} or C{*Nvector} issues.

328 '''

329 pass

330

331

332 def _an(noun):

333 '''(INTERNAL) Prepend an article to a noun based

334 on the pronounciation of the first letter.

335 '''

336 a = _an_ if noun[:1].lower() in 'aeinoux' else _a_

337 return _SPACE_(a, noun)

338

339

340 def _and(*words):

341 '''(INTERNAL) Join C{words} with C{", "} and C{" and "}.

342 '''

343 return _and_or(_and_, *words)

344

345

346 def _and_or(last, *words):

347 '''(INTERNAL) Join C{words} with C{", "} and C{B{last}}.

348 '''

349 t, w = NN, list(words)

350 if w:

351 t = w.pop()

352 if w:

353 w = _COMMASPACE_.join(w)

354 t = _SPACE_(w, last, t)

355 return t

356

357

358 def crosserrors(raiser=None):

359 '''Report or ignore vectorial cross product errors.

360

361 @kwarg raiser: Use C{True} to throw or C{False} to ignore

362 L{CrossError} exceptions. Use C{None} to

363 leave the setting unchanged.

364

365 @return: Previous setting (C{bool}).

366

367 @see: Property C{Vector3d[Base].crosserrors}.

368 '''

369 B = _MODS.vector3dBase.Vector3dBase

370 t = B._crosserrors # XXX class attr!

371 if raiser in (True, False):

372 B._crosserrors = raiser

373 return t

374

375

376 def _error_init(Error, inst, args, fmt_name_value='%s (%r)', txt=NN,

377 cause=None, **kwds): # by .lazily

378 '''(INTERNAL) Format an error text and initialize an C{Error} instance.

379

380 @arg Error: The error super-class (C{Exception}).

381 @arg inst: Sub-class instance to be __init__-ed (C{_Exception}).

382 @arg args: Either just a value or several name, value, ...

383 positional arguments (C{str}, any C{type}), in

384 particular for name conflicts with keyword

385 arguments of C{error_init} or which can't be

386 given as C{name=value} keyword arguments.

387 @kwarg fmt_name_value: Format for (name, value) (C{str}).

388 @kwarg txt: Optional explanation of the error (C{str}).

389 @kwarg cause: Optional, caught error (L{Exception}), for

390 exception chaining (supported in Python 3+).

391 @kwarg kwds: Additional C{B{name}=value} pairs, if any.

392 '''

393 def _fmtuple(pairs):

394 return tuple(fmt_name_value % t for t in pairs)

395

396 t, n = (), len(args)

397 if n > 2:

398 s = _MODS.basics.isodd(n)

399 t = _fmtuple(zip(args[0::2], args[1::2]))

400 if s: # XXX _xzip(..., strict=s)

401 t += args[-1:]

402 elif n == 2:

403 t = (fmt_name_value % args),

404 elif n: # == 1

405 t = str(args[0]),

406

407 if kwds:

408 t += _fmtuple(itemsorted(kwds))

409 t = _or(*t) if t else _SPACE_(_name_value_, MISSING)

410

411 if txt is not None:

412 x = str(txt) or (str(cause) if cause else _invalid_)

413 C = _COMMASPACE_ if _COLON_ in t else _COLONSPACE_

414 t = C(t, x)

415# else: # LenError, _xzip, .dms, .heights, .vector2d

416# x = NN # XXX or t?

417 Error.__init__(inst, t)

418# inst.__x_txt__ = x # hold explanation

419 _error_cause(inst, cause=cause if _exception_chaining else None)

420 _error_under(inst)

421

422

423 def _error_under(inst):

424 '''(INTERNAL) Remove leading underscore from instance' class name.

425 '''

426 n = inst.__class__.__name__

427 if n.startswith(_UNDER_):

428 inst.__class__.__name__ = n.lstrip(_UNDER_)

429 return inst

430

431

432 def exception_chaining(error=None):

433 '''Get an error's I{cause} or the exception chaining setting.

434

435 @kwarg error: An error instance (C{Exception}) or C{None}.

436

437 @return: If C{B{error} is None}, return C{True} if exception

438 chaining is enabled for PyGeodesy errors, C{False}

439 if turned off and C{None} if not available. If

440 B{C{error}} is not C{None}, return it's error

441 I{cause} or C{None}.

442

443 @note: To enable exception chaining for C{pygeodesy} errors,

444 set env var C{PYGEODESY_EXCEPTION_CHAINING} to any

445 non-empty value prior to C{import pygeodesy}.

446 '''

447 return _exception_chaining if error is None else \

448 getattr(error, '__cause__', None)

449

450

451 def _incompatible(this):

452 '''(INTERNAL) Format an C{"incompatible with ..."} text.

453 '''

454 return _SPACE_(_incompatible_, _with_, this)

455

456

457 def _InvalidError(Error=_ValueError, **txt_name_values_cause): # txt=_invalid_, name=value [, ...]

458 '''(INTERNAL) Create an C{Error} instance.

459

460 @kwarg Error: The error class or sub-class (C{Exception}).

461 @kwarg txt_name_values: One or more C{B{name}=value} pairs

462 and optionally, keyword argument C{B{txt}=str}

463 to override the default C{B{txt}='invalid'} and

464 C{B{cause}=None} for exception chaining.

465

466 @return: An B{C{Error}} instance.

467 '''

468 return _XError(Error, **txt_name_values_cause)

469

470

471 def isError(obj):

472 '''Check a (caught) exception.

473

474 @arg obj: The exception C({Exception}).

475

476 @return: C{True} if B{C{obj}} is a C{pygeodesy} error,

477 C{False} if B{C{obj}} is a standard Python error

478 of C{None} if neither.

479 '''

480 return True if isinstance(obj, _XErrors) else (

481 False if isinstance(obj, Exception) else None)

482

483

484 def _IsnotError(*nouns, **name_value_Error_cause): # name=value [, Error=TypeError, cause=None]

485 '''Create a C{TypeError} for an invalid C{name=value} type.

486

487 @arg nouns: One or more expected class or type names, usually nouns (C{str}).

488 @kwarg name_value_Error_cause: One C{B{name}=value} pair and optionally,

489 keyword argument C{B{Error}=TypeError} to override the default

490 and C{B{cause}=None} for exception chaining.

491

492 @return: A C{TypeError} or an B{C{Error}} instance.

493 '''

494 x, Error = _xkwds_pop_(name_value_Error_cause, cause=None, Error=TypeError)

495 n, v = _xkwds_popitem(name_value_Error_cause) if name_value_Error_cause \

496 else (_name_value_, MISSING) # XXX else tuple(...)

497 n = _MODS.streprs.Fmt.PARENSPACED(n, repr(v))

498 t = _not_(_an(_or(*nouns)) if nouns else _specified_)

499 return _XError(Error, n, txt=t, cause=x)

500

501

502 def itemsorted(adict, *args, **asorted_reverse):

503 '''Return the items of C{B{adict}} sorted I{alphabetically, case-insensitively}

504 and in I{ascending} order.

505

506 @arg args: Optional argument(s) for method C{B{adict}.items(B*{args})}.

507 @kwarg asorted_reverse: Use keyword argument C{B{asorted}=False} for

508 I{case-sensitive} sorting and C{B{reverse}=True} for

509 results in C{descending} order.

510 '''

511 def _un(item):

512 return item[0].lower()

513

514 # see .rhumb.Rhumb and ._RhumbLine

515 a, r = _xkwds_get_(asorted_reverse, asorted=True, reverse=False) \

516 if asorted_reverse else (True, False)

517 items = adict.items(*args) if args else adict.items()

518 return sorted(items, reverse=r, key=_un if a else None)

519

520

521 def limiterrors(raiser=None):

522 '''Get/set the throwing of L{LimitError}s.

523

524 @kwarg raiser: Choose C{True} to raise or C{False} to

525 ignore L{LimitError} exceptions. Use

526 C{None} to leave the setting unchanged.

527

528 @return: Previous setting (C{bool}).

529 '''

530 global _limiterrors

531 t = _limiterrors

532 if raiser in (True, False):

533 _limiterrors = raiser

534 return t

535

536

537 def _or(*words):

538 '''(INTERNAL) Join C{words} with C{", "} and C{" or "}.

539 '''

540 return _and_or(_or_, *words)

541

542

543 def _parseX(parser, *args, **name_values_Error): # name=value[, ..., Error=ParseError]

544 '''(INTERNAL) Invoke a parser and handle exceptions.

545

546 @arg parser: The parser (C{callable}).

547 @arg args: Any B{C{parser}} arguments (any C{type}s).

548 @kwarg name_values_Error: Any C{B{name}=value} pairs and

549 optionally, C{B{Error}=ParseError} keyword

550 argument to override the default.

551

552 @return: Parser result.

553

554 @raise ParseError: Or the specified C{B{Error}}.

555 '''

556 try:

557 return parser(*args)

558 except Exception as x:

559 E = _xkwds_pop(name_values_Error, Error=type(x) if isError(x) else

560 ParseError)

561 raise _XError(E, **_xkwds(name_values_Error, cause=x))

562

563

564 def rangerrors(raiser=None):

565 '''Get/set the throwing of L{RangeError}s.

566

567 @kwarg raiser: Choose C{True} to raise or C{False} to ignore

568 L{RangeError} exceptions. Use C{None} to leave

569 the setting unchanged.

570

571 @return: Previous setting (C{bool}).

572 '''

573 global _rangerrors

574 t = _rangerrors

575 if raiser in (True, False):

576 _rangerrors = raiser

577 return t

578

579

580 def _SciPyIssue(x, *extras): # PYCHOK no cover

581 if isinstance(x, (RuntimeWarning, UserWarning)):

582 Error = SciPyWarning

583 else:

584 Error = SciPyError # PYCHOK not really

585 t = _SPACE_(str(x).strip(), *extras)

586 return Error(t, cause=x)

587

588

589 def _xattr(obj, **name_default): # see .strerprs._xattrs

590 '''(INTERNAL) Get an C{obj}'s attribute by C{name}.

591 '''

592 if len(name_default) == 1:

593 for n, d in name_default.items():

594 return getattr(obj, n, d)

595 raise _xkwds_Error(_xattr, obj, name_default)

596

597

598 def _xdatum(datum1, datum2, Error=None):

599 '''(INTERNAL) Check for datum, ellipsoid or rhumb mis-match.

600 '''

601 if Error:

602 E1, E2 = datum1.ellipsoid, datum2.ellipsoid

603 if E1 != E2:

604 raise Error(E2.named2, txt=_incompatible(E1.named2))

605 elif datum1 != datum2:

606 t = _SPACE_(_datum_, repr(datum1.name), _not_, repr(datum2.name))

607 raise _AssertionError(t)

608

609

610 def _xellipsoidal(**name_value):

611 '''(INTERNAL) Check an I{ellipsoidal} item.

612

613 @return: The B{C{value}} if ellipsoidal.

614

615 @raise TypeError: Not ellipsoidal B{C{value}}.

616 '''

617 try:

618 for n, v in name_value.items():

619 if v.isEllipsoidal:

620 return v

621 break

622 else:

623 n = v = MISSING

624 except AttributeError:

625 pass

626 raise _TypeError(n, v, txt=_not_(_ellipsoidal_))

627

628

629 def _XError(Error, *args, **kwds):

630 '''(INTERNAL) Format an C{Error} or C{_Error}.

631 '''

632 try: # C{_Error} style

633 return Error(*args, **kwds)

634 except TypeError: # no keyword arguments

635 pass

636 e = _ValueError(*args, **kwds)

637 E = Error(str(e))

638 if _exception_chaining:

639 _error_cause(E, cause=e.__cause__) # PYCHOK OK

640 return E

641

642

643_XErrors = _TypeError, _ValueError

644# map certain C{Exception} classes to the C{_Error}

645_X2Error = {AssertionError: _AssertionError,

646 AttributeError: _AttributeError,

647 ImportError: _ImportError,

648 IndexError: _IndexError,

649 KeyError: _KeyError,

650 NameError: _NameError,

651 NotImplementedError: _NotImplementedError,

652 OverflowError: _OverflowError,

653 TypeError: _TypeError,

654 ValueError: _ValueError,

655 ZeroDivisionError: _ZeroDivisionError}

656

657

658 def _xError(x, *args, **kwds):

659 '''(INTERNAL) Embellish a (caught) exception.

660

661 @arg x: The exception (usually, C{_Error}).

662 @arg args: Embelishments (C{any}).

663 @kwarg kwds: Embelishments (C{any}).

664 '''

665 return _XError(type(x), *args, **_xkwds(kwds, cause=x))

666

667

668 def _xError2(x): # in .fsums

669 '''(INTERNAL) Map an exception to 2-tuple (C{_Error} class, error C{txt}).

670

671 @arg x: The exception instance (usually, C{Exception}).

672 '''

673 X = type(x)

674 E = _X2Error.get(X, X)

675 if E is X and not isError(x):

676 E = _NotImplementedError

677 t = repr(x)

678 else:

679 t = str(x)

680 return E, t

681

682

683 try:

684 _ = {}.__or__ # {} | {} # Python 3.9+

685

686 def _xkwds(kwds, **dflts):

687 '''(INTERNAL) Override C{dflts} with specified C{kwds}.

688 '''

689 return (dflts | kwds) if kwds else dflts

690

691 except AttributeError:

692 from copy import copy as _copy

693

694 def _xkwds(kwds, **dflts): # PYCHOK expected

695 '''(INTERNAL) Override C{dflts} with specified C{kwds}.

696 '''

697 d = dflts

698 if kwds:

699 d = _copy(d)

700 d.update(kwds)

701 return d

702

703

704 def _xkwds_bool(inst, **kwds): # in .frechet, .hausdorff, .heights

705 '''(INTERNAL) Set applicable C{bool} properties/attributes.

706 '''

707 for n, v in kwds.items():

708 b = getattr(inst, n, None)

709 if b is None: # invalid bool attr

710 t = _SPACE_(_EQUAL_(n, repr(v)), 'for', inst.__class__.__name__) # XXX .classname

711 raise _AttributeError(t, txt=_not_('applicable'))

712 if v in (False, True) and v != b:

713 setattr(inst, NN(_UNDER_, n), v)

714

715

716 def _xkwds_Error(where, kwds, name_txt, txt=_default_):

717 # Helper for _xkwds_get, _xkwds_pop and _xkwds_popitem below

718 f = _COMMASPACE_.join(_pairs(kwds) + _pairs(name_txt))

719 f = _MODS.streprs.Fmt.PAREN(where.__name__, f)

720 t = _multiple_ if name_txt else _no_

721 t = _SPACE_(t, _EQUAL_(_name_, txt), _kwargs_)

722 return _AssertionError(f, txt=t)

723

724

725 def _xkwds_get(kwds, **name_default):

726 '''(INTERNAL) Get a C{kwds} value by C{name}, or the C{default}.

727 '''

728 if len(name_default) == 1:

729 for n, d in name_default.items():

730 return kwds.get(n, d)

731 raise _xkwds_Error(_xkwds_get, kwds, name_default)

732

733

734 def _xkwds_get_(kwds, **names_defaults):

735 '''(INTERNAL) Yield each C{kwds} value or its C{default}

736 in I{case-insensitive, alphabetical} order.

737 '''

738 for n, d in itemsorted(names_defaults):

739 yield kwds.get(n, d)

740

741

742 def _xkwds_not(*args, **kwds):

743 '''(INTERNAL) Return C{kwds} with a value not in C{args}.

744 '''

745 return dict((n, v) for n, v in kwds.items() if v not in args)

746

747

748 def _xkwds_pop(kwds, **name_default):

749 '''(INTERNAL) Pop a C{kwds} value by C{name}, or the C{default}.

750 '''

751 if len(name_default) == 1:

752 for n, d in name_default.items():

753 return kwds.pop(n, d)

754 raise _xkwds_Error(_xkwds_pop, kwds, name_default)

755

756

757 def _xkwds_pop_(kwds, **names_defaults):

758 '''(INTERNAL) Pop and yield each C{kwds} value or its C{default}

759 in I{case-insensitive, alphabetical} order.

760 '''

761 for n, d in itemsorted(names_defaults):

762 yield kwds.pop(n, d)

763

764

765 def _xkwds_popitem(name_value):

766 '''(INTERNAL) Return exactly one C{(name, value)} item.

767 '''

768 if len(name_value) == 1: # XXX TypeError

769 return name_value.popitem() # XXX AttributeError

770 raise _xkwds_Error(_xkwds_popitem, (), name_value, txt=_value_)

771

772

773 def _Xorder(_Coeffs, Error, **Xorder): # in .ktm, .rhumbBase

774 '''(INTERNAL) Validate C{RAorder} or C{TMorder}.

775 '''

776 X, m = Xorder.popitem()

777 if m in _Coeffs and _MODS.basics.isint(m):

778 return m

779 t = sorted(map(str, _Coeffs.keys()))

780 raise Error(X, m, txt=_not_(_or(*t)))

781

782

783 def _xzip(*args, **strict): # PYCHOK no cover

784 '''(INTERNAL) Standard C{zip(..., strict=True)}.

785 '''

786 s = _xkwds_get(strict, strict=True)

787 if s:

788 _zip = _MODS.basics._zip

789 if _zip is zip: # < (3, 10)

790 t = _MODS.streprs.unstr(_xzip.__name__, *args, strict=s)

791 raise _NotImplementedError(t, txt=None)

792 return _zip(*args)

793 return zip(*args)

794

795# **) MIT License

796#

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

798#

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

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

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

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

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

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

805#

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

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

808#

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

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

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

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

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

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

815# OTHER DEALINGS IN THE SOFTWARE.