# Coverage for pygeodesy/basics.py : 99%

## 126 statements 125 run 1 missing 29 excluded

Hot-keys on this page

r m x p toggle line displays

j k next/prev highlighted chunk

0 (zero) top of page

1 (one) first highlighted chunk

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 | # -*- coding: utf-8 -*- u'''Basic constants, definitions and functions. ''' from pygeodesy.errors import _AttributeError, _IsnotError, \ _TypesError, _ValueError from pygeodesy.lazily import _ALL_LAZY from copy import copy as _copy, deepcopy as _deepcopy from inspect import isclass from math import copysign, isinf, isnan, pi as PI from sys import float_info as _float_info # all public contants, classes and functions __all__ = _ALL_LAZY.basics __version__ = '20.05.12' try: # Luciano Ramalho, "Fluent Python", page 395, O'Reilly, 2016 from numbers import Integral as _Ints #: (INTERNAL) Int objects except ImportError: # PYCHOK no cover try: # _Ints imported by .utily _Ints = int, long #: (INTERNAL) Int objects (C{tuple}) except NameError: # Python 3+ _Ints = int, #: (INTERNAL) Int objects (C{tuple}) try: # similarly ... from numbers import Real as _Scalars #: (INTERNAL) Scalar objects except ImportError: # PYCHOK no cover try: _Scalars = int, long, float #: (INTERNAL) Scalar objects (C{tuple}) except NameError: _Scalars = int, float #: (INTERNAL) Scalar objects (C{tuple}) try: try: # use C{from collections.abc import ...} in Python 3.9+ from collections.abc import Sequence as _Sequence # imported by .points except ImportError: # no .abc in Python 2.7- from collections import Sequence as _Sequence # imported by .points if isinstance([], _Sequence) and isinstance((), _Sequence): # and isinstance(range(1), _Sequence): _Seqs = _Sequence else: raise ImportError # _AssertionError except ImportError: # PYCHOK no cover _Sequence = tuple # immutable for .points._Basequence _Seqs = list, _Sequence # , range for function len2 below try: _Strs = basestring, str except NameError: # Python 3+ _Strs = str, try: EPS = _float_info.epsilon #: System's epsilon (C{float}) MANTIS = _float_info.mant_dig #: System's mantissa bits (C{int}) MAX = _float_info.max #: System's float max (C{float}) MIN = _float_info.min #: System's float min (C{float}) except AttributeError: # PYCHOK no cover EPS = 2.220446049250313e-16 #: Epsilon (C{float}) 2**-52? MANTIS = 53 #: Mantissa bits ≈53 (C{int}) MAX = pow(2.0, 1023) * (2 - EPS) #: Float max (C{float}) ≈10**308, 2**1024? MIN = pow(2.0, -1021) # Float min (C{float}) ≈10**-308, 2**-1021? EPS_2 = EPS / 2.0 #: M{EPS / 2} ≈1.110223024625e-16 (C{float}) EPS1 = 1.0 - EPS #: M{1 - EPS} ≈0.9999999999999998 (C{float}) EPS1_2 = 1.0 - EPS_2 #: M{1 - EPS_2} ≈0.9999999999999999 (C{float}) # _1EPS = 1.0 + EPS #: M{1 + EPS} ≈1.0000000000000002 (C{float}) INF = float('inf') #: Infinity (C{float}), see function C{isinf}, C{isfinite} NAN = float('nan') #: Not-A-Number (C{float}), see function C{isnan} NEG0 = -0.0 #: Negative 0.0 (C{float}), see function C{isneg0} PI2 = PI * 2.0 #: Two PI, M{PI * 2} aka Tau (C{float}) # PYCHOK expected PI_2 = PI / 2.0 #: Half PI, M{PI / 2} (C{float}) PI_4 = PI / 4.0 #: Quarter PI, M{PI / 4} (C{float}) R_M = 6371008.771415 #: Mean, spherical earth radius (C{meter}). def _bkwds(inst, Error=AttributeError, **name_value_pairs): # in .frechet, .hausdorff, .heights '''(INTERNAL) Set applicable C{bool} properties/attributes. ''' for n, v in name_value_pairs.items(): b = getattr(inst, n, None) if b is None: # invalid bool attr t = n, v, inst.__class__.__name__ # XXX .classname raise Error('not applicable: %s=%r for %s' % t) if v in (False, True) and v != b: setattr(inst, '_' + n, v) def clips(bstr, limit=50, white=''): '''Clip a string to the given length limit. @arg bstr: String (C{bytes} or C{str}). @kwarg limit: Length limit (C{int}). @kwarg white: Optionally, replace all whitespace (C{str}). @return: The clipped or unclipped B{C{bstr}}. ''' if len(bstr) > limit > 8: h = limit // 2 bstr = bstr[:h] + type(bstr)('....') + bstr[-h:] if white: # replace whitespace bstr = type(bstr)(white).join(bstr.split()) return bstr def halfs2(str2): '''Split a string in 2 halfs. @arg str2: String to split (C{str}). @return: 2-Tuple (_1st, _2nd) half (C{str}). @raise ValueError: Zero or odd C{len}(B{C{str2}}). ''' h, r = divmod(len(str2), 2) if r or not h: raise _ValueError(str2=str2, txt='odd') return str2[:h], str2[h:] try: from math import isfinite # new in Python 3+ except ImportError: def isfinite(obj): '''Check for C{Inf} and C{NaN} values. @arg obj: Value (C{scalar}). @return: C{False} if B{C{obj}} is C{INF} or C{NAN}, C{True} otherwise. @raise TypeError: Non-scalar B{C{obj}}. ''' if not isscalar(obj): raise _IsnotError(isscalar.__name__, obj=obj) return not (isinf(obj) or isnan(obj)) def isint(obj, both=False): '''Check for C{int} type or an integer C{float} value. @arg obj: The object (any C{type}). @kwarg both: Optionally, check C{float} type and value (C{bool}). @return: C{True} if B{C{obj}} is C{int} or an integer C{float}, C{False} otherwise. ''' if both and isinstance(obj, float): # NOT _Scalars! try: return obj.is_integer() except AttributeError: # PYCHOK no cover return False # XXX float(int(obj)) == obj? return isinstance(obj, _Ints) def isneg0(obj): '''Check for L{NEG0}, negative 0.0. @arg obj: Value (C{scalar}). @return: C{True} if B{C{obj}} is C{NEG0} or -0.0, C{False} otherwise. ''' return obj in (0.0, NEG0) and copysign(1, obj) < 0 # and str(obj).rstrip('0') == '-0.' def isscalar(obj): '''Check for scalar types. @arg obj: The object (any C{type}). @return: C{True} if B{C{obj}} is C{scalar}, C{False} otherwise. ''' return isinstance(obj, _Scalars) def issequence(obj, *excluded): '''Check for sequence types. @arg obj: The object (any C{type}). @arg excluded: Optional exclusions (C{type}). @note: Excluding C{tuple} implies excluding C{namedtuple}. @return: C{True} if B{C{obj}} is a sequence, C{False} otherwise. ''' return False if (excluded and isinstance(obj, excluded)) else \ isinstance(obj, _Seqs) def isstr(obj): '''Check for string types. @arg obj: The object (any C{type}). @return: C{True} if B{C{obj}} is C{str}, C{False} otherwise. ''' return isinstance(obj, _Strs) def issubclassof(Sub, Super): '''Check whether a class is a sub-class of a super class. @arg Sub: The sub-class (C{class}). @arg Super: The super class (C{class}). @return: C{True} if B{C{Sub}} is a sub-class of B{C{Super}}, C{False} otherwise (C{bool}). ''' return isclass(Sub) and isclass(Super) and issubclass(Sub, Super) def len2(items): '''Make built-in function L{len} work for generators, iterators, etc. since those can only be started exactly once. @arg items: Generator, iterator, list, range, tuple, etc. @return: 2-Tuple C{(n, items)} of the number of items (C{int}) and the items (C{list} or C{tuple}). ''' if not isinstance(items, _Seqs): # NOT hasattr(items, '__len__'): items = list(items) return len(items), items def map1(func, *xs): # XXX map_ '''Apply each argument to a single-argument function and return a C{tuple} of results. @arg func: Function to apply (C{callable}). @arg xs: Arguments to apply (C{any positional}). @return: Function results (C{tuple}). ''' return tuple(map(func, xs)) def map2(func, *xs): '''Apply arguments to a function and return a C{tuple} of results. Unlike Python 2's built-in L{map}, Python 3+ L{map} returns a L{map} object, an iterator-like object which generates the results only once. Converting the L{map} object to a tuple maintains Python 2 behavior. @arg func: Function to apply (C{callable}). @arg xs: Arguments to apply (C{list, tuple, ...}). @return: Function results (C{tuple}). ''' return tuple(map(func, *xs)) def property_doc_(doc): '''Decorator for a property with documentation. @arg doc: The property documentation (C{str}). @example: >>> @property_doc_("documentation text.") >>> def name(self): >>> ... >>> >>> @name.setter >>> def name(self, value): >>> ... ''' # See Luciano Ramalho, "Fluent Python", page 212ff, O'Reilly, 2016, # "Parameterized Decorators", especially Example 7-23. Also, see # <https://Python-3-Patterns-Idioms-Test.ReadTheDocs.io/en/latest/PythonDecorators.html> def _property(method): '''(INTERNAL) Return C{method} as documented C{property.getter}. ''' t = 'get and set' if doc.startswith(' ') else '' return property(method, None, None, 'Property to ' + t + doc) return _property class property_RO(property): # No __doc__ on purpose def __init__(self, method): # PYCHOK signature '''New immutable, read-only L{property_RO}. @arg method: The callable to be decorated as C{property.getter}. @note: Like standard Python C{property} without a C{property.setter}, but with a more descriptive error message when set. ''' self.name = method.__name__ # == self.fget.__name__ # U{Descriptor HowTo Guide<https://docs.Python.org/3/howto/descriptor.html>} def immutable(inst, value): '''Throws an C{AttributeError}, always. ''' t = immutable.__name__, inst, method.__name__, value raise _AttributeError('%s property: %r.%s = %r' % t) property.__init__(self, method, immutable, None, method.__doc__ or 'N/A') # def property_RO(method): # OBSOLETE # '''An immutable property (C{Read Only}). # # @arg method: The callable to be decorated as C{property.getter}. # # @note: Like standard Python C{property} without a C{property.setter}, # but with a more descriptive error message when set. # ''' # def Read_Only(inst, value): # '''Throws an C{AttributeError}, always. # ''' # t = Read_Only.__name__, inst, method.__name__, value # raise AttributeError('%s property: %r.%s = %r' % t) # # return property(method, Read_Only, None, method.__doc__ or 'N/A') def _xattrs(insto, other, *attrs): '''(INTERNAL) Copy attribute values from B{C{other}} to B{C{insto}}. @arg insto: Object to copy attribute values to (any C{type}). @arg other: Object to copy attribute values from (any C{type}). @arg attrs: One or more attribute names (C{str}s). @return: Object B{C{insto}}, updated. @raise AttributeError: An B{C{attrs}} doesn't exist or is not settable. ''' def _getattr(o, a): if hasattr(o, a): return getattr(o, a) raise _AttributeError('.%s' % (a,), o) for a in attrs: s = _getattr(other, a) g = _getattr(insto, a) if (g is None and s is not None) or g != s: setattr(insto, a, s) # not settable? return insto def _xcopy(inst, deep=False): '''(INTERNAL) Copy an object, shallow or deep. @arg inst: The object to copy (any C{type}). @kwarg deep: If C{True} make a deep, otherwise a shallow copy (C{bool}). @return: The copy of B{C{inst}}. ''' return _deepcopy(inst) if deep else _copy(inst) def _xinstanceof(*Types, **name_value_pairs): '''(INTERNAL) Check C{Types} of all C{name=value} pairs. @arg Types: One or more classes or types (C{class}). @kwarg name_value_pairs: One or more B{C{name=value}} pairs with the C{value} to be checked. @raise TypeError: At least one of the B{C{name_value_pairs}} is not any of the B{C{Types}}. ''' for n, v in name_value_pairs.items(): if not isinstance(v, Types): raise _TypesError(n, v, *Types) def _xkwds(kwds, **dflts): '''(INTERNAL) Override C{dflts} with C{kwds}. ''' d = dflts if kwds: d = _copy(d) d.update(kwds) return d def _xsubclassof(Class, **name_value_pairs): '''(INTERNAL) Check super C{Class} of all C{name=value} pairs. @arg Class: A class or type (C{class}). @kwarg name_value_pairs: One or more B{C{name=value}} pairs with the C{value} to be checked. @raise TypeError: At least one of the B{C{name_value_pairs}} is not a sub-class of B{C{Class}}. ''' for n, v in name_value_pairs.items(): if not issubclassof(v, Class): raise _TypesError(n, v, Class) def _xzipairs(lefts, rights, sep=', ', fmt='', pair='%s:%s'): '''(INTERNAL) Zip C{lefts} and C{rights} into a C{str}. ''' t = sep.join(pair % t for t in zip(lefts, rights)) if fmt: t = fmt % (t,) return t # **) MIT License # # Copyright (C) 2016-2020 -- mrJean1 at Gmail -- All Rights Reserved. # # Permission is hereby granted, free of charge, to any person obtaining a # copy of this software and associated documentation files (the "Software"), # to deal in the Software without restriction, including without limitation # the rights to use, copy, modify, merge, publish, distribute, sublicense, # and/or sell copies of the Software, and to permit persons to whom the # Software is furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included # in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR # OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, # ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR # OTHER DEALINGS IN THE SOFTWARE.