1

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

3

4 u'''Some, basic definitions, functions and dependencies.

5

6 Use env variable C{PYGEODESY_XPACKAGES} to avoid import of dependencies

7 C{geographiclib}, C{numpy} and/or C{scipy}. Set C{PYGEODESY_XPACKAGES}

8 to a comma-separated list of package names to be excluded from import.

9'''

10# make sure int/int division yields float quotient

11 from __future__ import division

12 division = 1 / 2 # .albers, .azimuthal, .constants, etc., .utily

13 if not division:

14 raise ImportError('%s 1/2 == %s' % ('division', division))

15 del division

16

17# from pygeodesy.cartesianBase import CartesianBase # _MODS

18# from pygeodesy.constants import isneg0, NEG0 # _MODS

19 from pygeodesy.errors import _AttributeError, _ImportError, _NotImplementedError, \

20 _TypeError, _TypesError, _ValueError, _xAssertionError, \

21 _xkwds_get1

22 from pygeodesy.internals import _0_0, _enquote, _passarg, _version_info

23 from pygeodesy.interns import MISSING, NN, _1_, _by_, _COMMA_, _DOT_, _DEPRECATED_, \

24 _ELLIPSIS4_, _EQUAL_, _in_, _invalid_, _N_A_, _not_, \

25 _not_scalar_, _odd_, _SPACE_, _UNDER_, _version_

26# from pygeodesy.latlonBase import LatLonBase # _MODS

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

28 LazyImportError, _sys_version_info2

29# from pygeodesy.named import classname, modulename, _name__ # _MODS

30# from pygeodesy.nvectorBase import NvectorBase # _MODS

31# from pygeodesy.props import _update_all # _MODS

32# from pygeodesy.streprs import Fmt # _MODS

33# from pygeodesy.unitsBase import _NamedUnit, Str # _MODS

34

35 from copy import copy as _copy, deepcopy as _deepcopy

36 from math import copysign as _copysign

37 import inspect as _inspect

38

39__all__ = _ALL_LAZY.basics

40__version__ = '24.08.13'

41

42_below_ = 'below'

43_list_tuple_types = (list, tuple)

44_PYGEODESY_XPACKAGES_ = 'PYGEODESY_XPACKAGES'

45_required_ = 'required'

46

47 try: # Luciano Ramalho, "Fluent Python", O'Reilly, 2016 p. 395, 2022 p. 577+

48 from numbers import Integral as _Ints, Real as _Scalars # .units

49 except ImportError:

50 try:

51 _Ints = int, long # int objects (C{tuple})

52 except NameError: # Python 3+

53 _Ints = int, # int objects (C{tuple})

54 _Scalars = (float,) + _Ints

55

56 try:

57 try: # use C{from collections.abc import ...} in Python 3.9+

58 from collections.abc import Sequence as _Sequence # in .points

59 except ImportError: # no .abc in Python 3.8- and 2.7-

60 from collections import Sequence as _Sequence # in .points

61 if isinstance([], _Sequence) and isinstance((), _Sequence):

62 # and isinstance(range(1), _Sequence):

63 _Seqs = _Sequence

64 else:

65 raise ImportError() # _AssertionError

66 except ImportError:

67 _Sequence = tuple # immutable for .points._Basequence

68 _Seqs = list, _Sequence # range for function len2 below

69

70 try:

71 _Bytes = unicode, bytearray # PYCHOK expected

72 _Strs = basestring, str # XXX , bytes

73 str2ub = ub2str = _passarg # avoids UnicodeDecodeError

74

75 def _Xstr(exc): # PYCHOK no cover

76 '''I{Invoke only with caught ImportError} B{C{exc}}.

77

78 C{... "can't import name _distributor_init" ...}

79

80 only for C{numpy}, C{scipy} import errors occurring

81 on arm64 Apple Silicon running macOS' Python 2.7.16?

82 '''

83 t = str(exc)

84 if '_distributor_init' in t:

85 from sys import exc_info

86 from traceback import extract_tb

87 tb = exc_info()[2] # 3-tuple (type, value, traceback)

88 t4 = extract_tb(tb, 1)[0] # 4-tuple (file, line, name, 'import ...')

89 t = _SPACE_("can't", t4[3] or _N_A_)

90 del tb, t4

91 return t

92

93 except NameError: # Python 3+

94 from pygeodesy.interns import _utf_8_

95

96 _Bytes = bytes, bytearray

97 _Strs = str, # tuple

98 _Xstr = str

99

100 def str2ub(sb):

101 '''Convert C{str} to C{unicode bytes}.

102 '''

103 if isinstance(sb, _Strs):

104 sb = sb.encode(_utf_8_)

105 return sb

106

107 def ub2str(ub):

108 '''Convert C{unicode bytes} to C{str}.

109 '''

110 if isinstance(ub, _Bytes):

111 ub = str(ub.decode(_utf_8_))

112 return ub

113

114

115 def _args_kwds_count2(func, exelf=True):

116 '''(INTERNAL) Get a C{func}'s args and kwds count as 2-tuple

117 C{(nargs, nkwds)}, including arg C{self} for methods.

118

119 @kwarg exelf: If C{True}, exclude C{self} in the C{args}

120 of a method (C{bool}).

121 '''

122 try:

123 a = k = 0

124 for _, p in _inspect.signature(func).parameters.items():

125 if p.kind is p.POSITIONAL_OR_KEYWORD:

126 if p.default is p.empty:

127 a += 1

128 else:

129 k += 1

130 except AttributeError: # .signature new Python 3+

131 s = _inspect.getargspec(func)

132 k = len(s.defaults or ())

133 a = len(s.args) - k

134 if exelf and a > 0 and _inspect.ismethod(func):

135 a -= 1

136 return a, k

137

138

139 def _args_kwds_names(func, splast=False):

140 '''(INTERNAL) Get a C{func}'s args and kwds names, including

141 C{self} for methods.

142

143 @kwarg splast: If C{True}, split the last keyword argument

144 at UNDERscores (C{bool}).

145

146 @note: Python 2 may I{not} include the C{*args} nor the

147 C{**kwds} names.

148 '''

149 try:

150 args_kwds = _inspect.signature(func).parameters.keys()

151 except AttributeError: # .signature new Python 3+

152 args_kwds = _inspect.getargspec(func).args

153 if splast and args_kwds:

154 args_kwds = list(args_kwds)

155 t = args_kwds[-1:]

156 if t:

157 s = t[0].strip(_UNDER_).split(_UNDER_)

158 if len(s) > 1 or s != t:

159 args_kwds += s

160 return tuple(args_kwds)

161

162

163 def clips(sb, limit=50, white=NN, length=False):

164 '''Clip a string to the given length limit.

165

166 @arg sb: String (C{str} or C{bytes}).

167 @kwarg limit: Length limit (C{int}).

168 @kwarg white: Optionally, replace all whitespace (C{str}).

169 @kwarg len: IF C{True} append the original I{[length]} (C{bool}).

170

171 @return: The clipped or unclipped B{C{sb}}.

172 '''

173 T, n = type(sb), len(sb)

174 if n > limit > 8:

175 h = limit // 2

176 sb = T(_ELLIPSIS4_).join((sb[:h], sb[-h:]))

177 if length:

178 n = _MODS.streprs.Fmt.SQUARE(n)

179 sb = T(NN).join((sb, n))

180 if white: # replace whitespace

181 sb = T(white).join(sb.split())

182 return sb

183

184

185 def copysign0(x, y):

186 '''Like C{math.copysign(x, y)} except C{zero}, I{unsigned}.

187

188 @return: C{math.copysign(B{x}, B{y})} if B{C{x}} else

189 C{type(B{x})(0)}.

190 '''

191 return _copysign(x, (y if y else 0)) if x else copytype(0, x)

192

193

194 def copytype(x, y):

195 '''Return the value of B{x} as C{type} of C{y}.

196

197 @return: C{type(B{y})(B{x})}.

198 '''

199 return type(y)(x if x else _0_0)

200

201

202 def _enumereverse(iterable):

203 '''(INTERNAL) Reversed C{enumberate}.

204 '''

205 for j in _reverange(len(iterable)):

206 yield j, iterable[j]

207

208

209 def halfs2(str2):

210 '''Split a string in 2 halfs.

211

212 @arg str2: String to split (C{str}).

213

214 @return: 2-Tuple C{(_1st, _2nd)} half (C{str}).

215

216 @raise ValueError: Zero or odd C{len(B{str2})}.

217 '''

218 h, r = divmod(len(str2), 2)

219 if r or not h:

220 raise _ValueError(str2=str2, txt=_odd_)

221 return str2[:h], str2[h:]

222

223

224 def int1s(x):

225 '''Count the number of 1-bits in an C{int}, I{unsigned}.

226

227 @note: C{int1s(-B{x}) == int1s(abs(B{x}))}.

228 '''

229 try:

230 return x.bit_count() # Python 3.10+

231 except AttributeError:

232 # bin(-x) = '-' + bin(abs(x))

233 return bin(x).count(_1_)

234

235

236 def isbool(obj):

237 '''Is B{C{obj}}ect a C{bool}ean?

238

239 @arg obj: The object (any C{type}).

240

241 @return: C{True} if C{bool}ean, C{False} otherwise.

242 '''

243 return isinstance(obj, bool) # and (obj is False

244# or obj is True)

245

246 assert not (isbool(1) or isbool(0) or isbool(None)) # PYCHOK 2

247

248

249 def isCartesian(obj, ellipsoidal=None):

250 '''Is B{C{obj}}ect some C{Cartesian}?

251

252 @arg obj: The object (any C{type}).

253 @kwarg ellipsoidal: If C{None}, return the type of any C{Cartesian},

254 if C{True}, only an ellipsoidal C{Cartesian type}

255 or if C{False}, only a spherical C{Cartesian type}.

256

257 @return: C{type(B{obj}} if a C{Cartesian} of the required type, C{False}

258 if a C{Cartesian} of an other type or {None} otherwise.

259 '''

260 if ellipsoidal is not None:

261 try:

262 return obj.ellipsoidalCartesian if ellipsoidal else obj.sphericalCartesian

263 except AttributeError:

264 return None

265 return isinstanceof(obj, _MODS.cartesianBase.CartesianBase)

266

267

268 if _FOR_DOCS: # XXX avoid epydoc Python 2.7 error

269

270 def isclass(obj):

271 '''Is B{C{obj}}ect a C{Class} or C{type}?

272 '''

273 return _inspect.isclass(obj)

274 else:

275 isclass = _inspect.isclass

276

277

278 def iscomplex(obj, both=False):

279 '''Is B{C{obj}}ect a C{complex} or complex literal C{str}?

280

281 @arg obj: The object (any C{type}).

282 @kwarg both: If C{True}, check complex C{str} (C{bool}).

283

284 @return: C{True} if C{complex}, C{False} otherwise.

285 '''

286 try: # hasattr('conjugate', 'real' and 'imag')

287 return isinstance(obj, complex) or bool(both and isstr(obj) and

288 isinstance(complex(obj), complex)) # numbers.Complex?

289 except (TypeError, ValueError):

290 return False

291

292

293 def isDEPRECATED(obj):

294 '''Is B{C{obj}}ect a C{DEPRECATED} class, method or function?

295

296 @return: C{True} if C{DEPRECATED}, {False} if not or

297 C{None} if undetermined.

298 '''

299 try: # XXX inspect.getdoc(obj) or obj.__doc__

300 doc = obj.__doc__.lstrip()

301 return bool(doc and doc.startswith(_DEPRECATED_))

302 except AttributeError:

303 return None

304

305

306 def isfloat(obj, both=False):

307 '''Is B{C{obj}}ect a C{float} or float literal C{str}?

308

309 @arg obj: The object (any C{type}).

310 @kwarg both: If C{True}, check float C{str} (C{bool}).

311

312 @return: C{True} if C{float}, C{False} otherwise.

313 '''

314 try:

315 return isinstance(obj, float) or bool(both and

316 isstr(obj) and isinstance(float(obj), float))

317 except (TypeError, ValueError):

318 return False

319

320

321 try:

322 isidentifier = str.isidentifier # Python 3, must be str

323 except AttributeError: # Python 2-

324

325 def isidentifier(obj):

326 '''Is B{C{obj}}ect a Python identifier?

327 '''

328 return bool(obj and isstr(obj)

329 and obj.replace(_UNDER_, NN).isalnum()

330 and not obj[:1].isdigit())

331

332

333 def isinstanceof(obj, *Classes):

334 '''Is B{C{obj}}ect an instance of one of the C{Classes}?

335

336 @arg obj: The object (any C{type}).

337 @arg Classes: One or more classes (C{Class}).

338

339 @return: C{type(B{obj}} if one of the B{C{Classes}},

340 C{None} otherwise.

341 '''

342 return type(obj) if isinstance(obj, Classes) else None

343

344

345 def isint(obj, both=False):

346 '''Is B{C{obj}}ect an C{int} or integer C{float} value?

347

348 @arg obj: The object (any C{type}).

349 @kwarg both: If C{True}, check C{float} and L{Fsum}

350 type and value (C{bool}).

351

352 @return: C{True} if C{int} or I{integer} C{float}

353 or L{Fsum}, C{False} otherwise.

354

355 @note: Both C{isint(True)} and C{isint(False)} return

356 C{False} (and no longer C{True}).

357 '''

358 if isinstance(obj, _Ints):

359 return not isbool(obj)

360 elif both: # and isinstance(obj, (float, Fsum))

361 try: # NOT , _Scalars) to include Fsum!

362 return obj.is_integer()

363 except AttributeError:

364 pass # XXX float(int(obj)) == obj?

365 return False

366

367

368 def isiterable(obj):

369 '''Is B{C{obj}}ect C{iterable}?

370

371 @arg obj: The object (any C{type}).

372

373 @return: C{True} if C{iterable}, C{False} otherwise.

374 '''

375 # <https://PyPI.org/project/isiterable/>

376 return hasattr(obj, '__iter__') # map, range, set

377

378

379 def isiterablen(obj):

380 '''Is B{C{obj}}ect C{iterable} and has C{len}gth?

381

382 @arg obj: The object (any C{type}).

383

384 @return: C{True} if C{iterable} with C{len}gth, C{False} otherwise.

385 '''

386 return hasattr(obj, '__len__') and hasattr(obj, '__getitem__')

387

388

389 try:

390 from keyword import iskeyword # Python 2.7+

391 except ImportError:

392

393 def iskeyword(unused):

394 '''Not Implemented, C{False} always.

395 '''

396 return False

397

398

399 def isLatLon(obj, ellipsoidal=None):

400 '''Is B{C{obj}}ect some C{LatLon}?

401

402 @arg obj: The object (any C{type}).

403 @kwarg ellipsoidal: If C{None}, return the type of any C{LatLon},

404 if C{True}, only an ellipsoidal C{LatLon type}

405 or if C{False}, only a spherical C{LatLon type}.

406

407 @return: C{type(B{obj}} if a C{LatLon} of the required type, C{False}

408 if a C{LatLon} of an other type or {None} otherwise.

409 '''

410 if ellipsoidal is not None:

411 try:

412 return obj.ellipsoidalLatLon if ellipsoidal else obj.sphericalLatLon

413 except AttributeError:

414 return None

415 return isinstanceof(obj, _MODS.latlonBase.LatLonBase)

416

417

418 def islistuple(obj, minum=0):

419 '''Is B{C{obj}}ect a C{list} or C{tuple} with non-zero length?

420

421 @arg obj: The object (any C{type}).

422 @kwarg minum: Minimal C{len} required C({int}).

423

424 @return: C{True} if a C{list} or C{tuple} with C{len} at

425 least B{C{minum}}, C{False} otherwise.

426 '''

427 return isinstance(obj, _list_tuple_types) and len(obj) >= minum

428

429

430 def isNvector(obj, ellipsoidal=None):

431 '''Is B{C{obj}}ect some C{Nvector}?

432

433 @arg obj: The object (any C{type}).

434 @kwarg ellipsoidal: If C{None}, return the type of any C{Nvector},

435 if C{True}, only an ellipsoidal C{Nvector type}

436 or if C{False}, only a spherical C{Nvector type}.

437

438 @return: C{type(B{obj}} if an C{Nvector} of the required type, C{False}

439 if an C{Nvector} of an other type or {None} otherwise.

440 '''

441 if ellipsoidal is not None:

442 try:

443 return obj.ellipsoidalNvector if ellipsoidal else obj.sphericalNvector

444 except AttributeError:

445 return None

446 return isinstanceof(obj, _MODS.nvectorBase.NvectorBase)

447

448

449 def isodd(x):

450 '''Is B{C{x}} odd?

451

452 @arg x: Value (C{scalar}).

453

454 @return: C{True} if odd, C{False} otherwise.

455 '''

456 return bool(int(x) & 1) # == bool(int(x) % 2)

457

458

459 def isscalar(obj, both=False):

460 '''Is B{C{obj}}ect an C{int} or integer C{float} value?

461

462 @arg obj: The object (any C{type}).

463 @kwarg both: If C{True}, check L{Fsum<Fsum.residual>}.

464

465 @return: C{True} if C{int}, C{float} or L{Fsum} with

466 zero residual, C{False} otherwise.

467 '''

468 if isinstance(obj, _Scalars):

469 return not isbool(obj)

470 elif both: # and isinstance(obj, Fsum)

471 try:

472 return bool(obj.residual == 0)

473 except (AttributeError, TypeError):

474 pass # XXX float(int(obj)) == obj?

475 return False

476

477

478 def issequence(obj, *excls):

479 '''Is B{C{obj}}ect some sequence type?

480

481 @arg obj: The object (any C{type}).

482 @arg excls: Classes to exclude (C{type}), all positional.

483

484 @note: Excluding C{tuple} implies excluding C{namedtuple}.

485

486 @return: C{True} if a sequence, C{False} otherwise.

487 '''

488 return isinstance(obj, _Seqs) and not (excls and isinstance(obj, excls))

489

490

491 def isstr(obj):

492 '''Is B{C{obj}}ect some string type?

493

494 @arg obj: The object (any C{type}).

495

496 @return: C{True} if a C{str}, C{bytes}, ...,

497 C{False} otherwise.

498 '''

499 return isinstance(obj, _Strs)

500

501

502 def issubclassof(Sub, *Supers):

503 '''Is B{C{Sub}} a class and sub-class of some other class(es)?

504

505 @arg Sub: The sub-class (C{Class}).

506 @arg Supers: One or more C(super) classes (C{Class}).

507

508 @return: C{True} if a sub-class of any B{C{Supers}}, C{False}

509 if not (C{bool}) or C{None} if not a class or if no

510 B{C{Supers}} are given or none of those are a class.

511 '''

512 if isclass(Sub):

513 t = tuple(S for S in Supers if isclass(S))

514 if t:

515 return bool(issubclass(Sub, t))

516 return None

517

518

519 def itemsorted(adict, *items_args, **asorted_reverse):

520 '''Return the items of C{B{adict}} sorted I{alphabetically,

521 case-insensitively} and in I{ascending} order.

522

523 @arg items_args: Optional positional argument(s) for method

524 C{B{adict}.items(B*{items_args})}.

525 @kwarg asorted_reverse: Use C{B{asorted}=False} for I{alphabetical,

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

527 sorting in C{descending} order.

528 '''

529 def _ins(item): # functools.cmp_to_key

530 k, v = item

531 return k.lower()

532

533 def _reverse_key(asorted=True, reverse=False):

534 return dict(reverse=reverse, key=_ins if asorted else None)

535

536 items = adict.items(*items_args) if items_args else adict.items()

537 return sorted(items, **_reverse_key(**asorted_reverse))

538

539

540 def len2(items):

541 '''Make built-in function L{len} work for generators, iterators,

542 etc. since those can only be started exactly once.

543

544 @arg items: Generator, iterator, list, range, tuple, etc.

545

546 @return: 2-Tuple C{(n, items)} of the number of items (C{int})

547 and the items (C{list} or C{tuple}).

548 '''

549 if not isinstance(items, _Seqs): # NOT hasattr(items, '__len__'):

550 items = list(items)

551 return len(items), items

552

553

554 def map1(fun1, *xs): # XXX map_

555 '''Call a single-argument function to each B{C{xs}}

556 and return a C{tuple} of results.

557

558 @arg fun1: 1-Arg function (C{callable}).

559 @arg xs: Arguments (C{any positional}).

560

561 @return: Function results (C{tuple}).

562 '''

563 return tuple(map(fun1, xs))

564

565

566 def map2(fun, *xs):

567 '''Like Python's B{C{map}} but returning a C{tuple} of results.

568

569 Unlike Python 2's built-in L{map}, Python 3+ L{map} returns a

570 L{map} object, an iterator-like object which generates the

571 results only once. Converting the L{map} object to a tuple

572 maintains the Python 2 behavior.

573

574 @arg fun: Function (C{callable}).

575 @arg xs: Arguments (C{all positional}).

576

577 @return: Function results (C{tuple}).

578 '''

579 return tuple(map(fun, *xs))

580

581

582 def neg(x, neg0=None):

583 '''Negate C{x} and optionally, negate C{0.0} and C{-0.0}.

584

585 @kwarg neg0: Defines the return value for zero C{B{x}}: if C{None}

586 return C{0.0}, if C{True} return C{NEG0 if B{x}=0.0}

587 and C{0.0 if B{x}=NEG0} or if C{False} return C{B{x}}

588 I{as-is} (C{bool} or C{None}).

589

590 @return: C{-B{x} if B{x} else 0.0, NEG0 or B{x}}.

591 '''

592 return (-x) if x else (

593 _0_0 if neg0 is None else (

594 x if not neg0 else (

595 _0_0 if signBit(x) else _MODS.constants.

596 NEG0))) # PYCHOK indent

597

598

599 def neg_(*xs):

600 '''Negate all C{xs} with L{neg}.

601

602 @return: A C{map(neg, B{xs})}.

603 '''

604 return map(neg, xs)

605

606

607 def _neg0(x):

608 '''(INTERNAL) Return C{NEG0 if x < 0 else _0_0},

609 unlike C{_copysign_0_0} which returns C{_N_0_0}.

610 '''

611 return _MODS.constants.NEG0 if x < 0 else _0_0

612

613

614 def _req_d_by(where, **name):

615 '''(INTERNAL) Get the fully qualified name.

616 '''

617 m = _MODS.named

618 n = m._name__(**name)

619 m = m.modulename(where, prefixed=True)

620 if n:

621 m = _DOT_(m, n)

622 return _SPACE_(_required_, _by_, m)

623

624

625 def _reverange(n, stop=-1, step=-1):

626 '''(INTERNAL) Reversed range yielding C{n-1, n-1-step, ..., stop+1}.

627 '''

628 return range(n - 1, stop, step)

629

630

631 def signBit(x):

632 '''Return C{signbit(B{x})}, like C++.

633

634 @return: C{True} if C{B{x} < 0} or C{NEG0} (C{bool}).

635 '''

636 return x < 0 or _MODS.constants.isneg0(x)

637

638

639 def _signOf(x, ref): # in .fsums

640 '''(INTERNAL) Return the sign of B{C{x}} versus B{C{ref}}.

641 '''

642 return (-1) if x < ref else (+1 if x > ref else 0)

643

644

645 def signOf(x):

646 '''Return sign of C{x} as C{int}.

647

648 @return: -1, 0 or +1 (C{int}).

649 '''

650 try:

651 s = x.signOf() # Fsum instance?

652 except AttributeError:

653 s = _signOf(x, 0)

654 return s

655

656

657 def splice(iterable, n=2, **fill):

658 '''Split an iterable into C{n} slices.

659

660 @arg iterable: Items to be spliced (C{list}, C{tuple}, ...).

661 @kwarg n: Number of slices to generate (C{int}).

662 @kwarg fill: Optional fill value for missing items.

663

664 @return: A generator for each of B{C{n}} slices,

665 M{iterable[i::n] for i=0..n}.

666

667 @raise TypeError: Invalid B{C{n}}.

668

669 @note: Each generated slice is a C{tuple} or a C{list},

670 the latter only if the B{C{iterable}} is a C{list}.

671

672 @example:

673

674 >>> from pygeodesy import splice

675

676 >>> a, b = splice(range(10))

677 >>> a, b

678 ((0, 2, 4, 6, 8), (1, 3, 5, 7, 9))

679

680 >>> a, b, c = splice(range(10), n=3)

681 >>> a, b, c

682 ((0, 3, 6, 9), (1, 4, 7), (2, 5, 8))

683

684 >>> a, b, c = splice(range(10), n=3, fill=-1)

685 >>> a, b, c

686 ((0, 3, 6, 9), (1, 4, 7, -1), (2, 5, 8, -1))

687

688 >>> tuple(splice(list(range(9)), n=5))

689 ([0, 5], [1, 6], [2, 7], [3, 8], [4])

690

691 >>> splice(range(9), n=1)

692 <generator object splice at 0x0...>

693 '''

694 if not isint(n):

695 raise _TypeError(n=n)

696

697 t = _xiterablen(iterable)

698 if not isinstance(t, _list_tuple_types):

699 t = tuple(t)

700

701 if n > 1:

702 if fill:

703 fill = _xkwds_get1(fill, fill=MISSING)

704 if fill is not MISSING:

705 m = len(t) % n

706 if m > 0: # same type fill

707 t = t + type(t)((fill,) * (n - m))

708 for i in range(n):

709 # XXX t[i::n] chokes PyChecker

710 yield t[slice(i, None, n)]

711 else:

712 yield t # 1 slice, all

713

714

715 def _splituple(strs, *sep_splits): # in .mgrs, .osgr, .webmercator

716 '''(INTERNAL) Split a C{comma}- or C{whitespace}-separated

717 string into a C{tuple} of stripped strings.

718 '''

719 t = (strs.split(*sep_splits) if sep_splits else

720 strs.replace(_COMMA_, _SPACE_).split()) if strs else ()

721 return tuple(s.strip() for s in t if s)

722

723

724 def unsigned0(x):

725 '''Unsign if C{0.0}.

726

727 @return: C{B{x}} if B{C{x}} else C{0.0}.

728 '''

729 return x if x else _0_0

730

731

732 def _xcopy(obj, deep=False):

733 '''(INTERNAL) Copy an object, shallow or deep.

734

735 @arg obj: The object to copy (any C{type}).

736 @kwarg deep: If C{True}, make a deep, otherwise

737 a shallow copy (C{bool}).

738

739 @return: The copy of B{C{obj}}.

740 '''

741 return _deepcopy(obj) if deep else _copy(obj)

742

743

744 def _xdup(obj, deep=False, **items):

745 '''(INTERNAL) Duplicate an object, replacing some attributes.

746

747 @arg obj: The object to copy (any C{type}).

748 @kwarg deep: If C{True}, copy deep, otherwise shallow (C{bool}).

749 @kwarg items: Attributes to be changed (C{any}).

750

751 @return: A duplicate of B{C{obj}} with modified

752 attributes, if any B{C{items}}.

753

754 @raise AttributeError: Some B{C{items}} invalid.

755 '''

756 d = _xcopy(obj, deep=deep)

757 for n, v in items.items():

758 if getattr(d, n, v) != v:

759 setattr(d, n, v)

760 elif not hasattr(d, n):

761 t = _MODS.named.classname(obj)

762 t = _SPACE_(_DOT_(t, n), _invalid_)

763 raise _AttributeError(txt=t, obj=obj, **items)

764# if items:

765# _MODS.props._update_all(d)

766 return d

767

768

769 def _xgeographiclib(where, *required):

770 '''(INTERNAL) Import C{geographiclib} and check required version.

771 '''

772 try:

773 _xpackage(_xgeographiclib)

774 import geographiclib

775 except ImportError as x:

776 raise _xImportError(x, where, Error=LazyImportError)

777 return _xversion(geographiclib, where, *required)

778

779

780 def _xImportError(exc, where, Error=_ImportError, **name):

781 '''(INTERNAL) Embellish an C{Lazy/ImportError}.

782 '''

783 t = _req_d_by(where, **name)

784 return Error(_Xstr(exc), txt=t, cause=exc)

785

786

787 def _xinstanceof(*Types, **names_values):

788 '''(INTERNAL) Check C{Types} of all C{name=value} pairs.

789

790 @arg Types: One or more classes or types (C{class}), all

791 positional.

792 @kwarg names_values: One or more C{B{name}=value} pairs

793 with the C{value} to be checked.

794

795 @raise TypeError: One B{C{names_values}} pair is not an

796 instance of any of the B{C{Types}}.

797 '''

798 if not (Types and names_values):

799 raise _xAssertionError(_xinstanceof, *Types, **names_values)

800

801 for n, v in names_values.items():

802 if not isinstance(v, Types):

803 raise _TypesError(n, v, *Types)

804

805

806 def _xiterable(obj):

807 '''(INTERNAL) Return C{obj} if iterable, otherwise raise C{TypeError}.

808 '''

809 return obj if isiterable(obj) else _xiterror(obj, _xiterable) # PYCHOK None

810

811

812 def _xiterablen(obj):

813 '''(INTERNAL) Return C{obj} if iterable with C{__len__}, otherwise raise C{TypeError}.

814 '''

815 return obj if isiterablen(obj) else _xiterror(obj, _xiterablen) # PYCHOK None

816

817

818 def _xiterror(obj, _xwhich):

819 '''(INTERNAL) Helper for C{_xinterable} and C{_xiterablen}.

820 '''

821 t = _not_(_xwhich.__name__[2:]) # _dunder_nameof

822 raise _TypeError(repr(obj), txt=t)

823

824

825 def _xnumpy(where, *required):

826 '''(INTERNAL) Import C{numpy} and check required version.

827 '''

828 try:

829 _xpackage(_xnumpy)

830 import numpy

831 except ImportError as x:

832 raise _xImportError(x, where)

833 return _xversion(numpy, where, *required)

834

835

836 def _xor(x, *xs):

837 '''(INTERNAL) Exclusive-or C{x} and C{xs}.

838 '''

839 for x_ in xs:

840 x ^= x_

841 return x

842

843

844 def _xpackage(_xpkg):

845 '''(INTERNAL) Check dependency to be excluded.

846 '''

847 n = _xpkg.__name__[2:] # _dunder_nameof

848 if n in _XPACKAGES:

849 x = _SPACE_(n, _in_, _PYGEODESY_XPACKAGES_)

850 e = _enquote(_getenv(_PYGEODESY_XPACKAGES_, NN))

851 raise ImportError(_EQUAL_(x, e))

852

853

854 def _xscalar(**names_values):

855 '''(INTERNAL) Check all C{name=value} pairs to be C{scalar}.

856 '''

857 for n, v in names_values.items():

858 if not isscalar(v):

859 raise _TypeError(n, v, txt=_not_scalar_)

860

861

862 def _xscipy(where, *required):

863 '''(INTERNAL) Import C{scipy} and check required version.

864 '''

865 try:

866 _xpackage(_xscipy)

867 import scipy

868 except ImportError as x:

869 raise _xImportError(x, where)

870 return _xversion(scipy, where, *required)

871

872

873 def _xsubclassof(*Classes, **names_values):

874 '''(INTERNAL) Check (super) class of all C{name=value} pairs.

875

876 @arg Classes: One or more classes or types (C{class}), all

877 positional.

878 @kwarg names_values: One or more C{B{name}=value} pairs

879 with the C{value} to be checked.

880

881 @raise TypeError: One B{C{names_values}} pair is not a

882 (sub-)class of any of the B{C{Classes}}.

883 '''

884 if not (Classes and names_values):

885 raise _xAssertionError(_xsubclassof, *Classes, **names_values)

886

887 for n, v in names_values.items():

888 if not issubclassof(v, *Classes):

889 raise _TypesError(n, v, *Classes)

890

891

892 def _xversion(package, where, *required, **name):

893 '''(INTERNAL) Check the C{package} version vs B{C{required}}.

894 '''

895 if required:

896 t = _version_info(package)

897 if t[:len(required)] < required:

898 t = _SPACE_(package.__name__, # _dunder_nameof

899 _version_, _DOT_(*t),

900 _below_, _DOT_(*required),

901 _req_d_by(where, **name))

902 raise ImportError(t)

903 return package

904

905

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

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

908 '''

909 s = _xkwds_get1(strict, strict=True)

910 if s:

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

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

913 raise _NotImplementedError(t, txt=None)

914 return _zip(*args)

915 return zip(*args)

916

917

918 if _sys_version_info2 < (3, 10): # see .errors

919 _zip = zip # PYCHOK exported

920 else: # Python 3.10+

921

922 def _zip(*args):

923 return zip(*args, strict=True)

924

925_XPACKAGES = _splituple(_getenv(_PYGEODESY_XPACKAGES_, NN).lower())

926

927# **) MIT License

928#

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

930#

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

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

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

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

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

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

937#

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

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

940#

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

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

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

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

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

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

947# OTHER DEALINGS IN THE SOFTWARE.