# Coverage for pygeodesy/lazily.py : 96%

## 99 statements 95 run 4 missing 15 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 | # -*- coding: utf-8 -*- u'''Lazily import C{pygeodesy} modules and attributes, based on U{lazy_import<https://modutil.ReadTheDocs.io/en/latest/#lazy_import>} from Brett Cannon's U{modutil<https://PyPI.org/project/modutil>}. C{Lazy import} is I{supported only for U{Python 3.7+ <https://Snarky.CA/lazy-importing-in-python-3-7>}} and is I{enabled by default in U{PyGeodesy 18.11.10+<https://PyPI.org/project/PyGeodesy>} and later}. To disable C{lazy import}, set environment variable C{PYGEODESY_LAZY_IMPORT} to C{0} or an empty string. Use C{2} or higher to print a message for each lazily imported module and attribute, similar to environment variable C{PYTHONVERBOSE} showing imports. Using C{3} or higher also shows the importing file name and line number. @note: C{Lazy import} applies only to top-level modules of C{pygeodesy}. A C{lazy import} of a top-level module also loads all sub-modules imported by that top-level module. @var isLazy: Lazy import setting (C{int} 0, 1, 2 or 3+) from environment variable C{PYGEODESY_LAZY_IMPORT}, or C{None} if C{lazy import} is not supported or not enabled, or C{False} if initializing C{lazy import} failed. ''' from os import environ as _environ _FOR_DOCS = _environ.get('PYGEODESY_FOR_DOCS', None) # for epydoc ... _N_A = object() # @module_property[_RO?] <https://GitHub.com/jtushman/proxy_tools/> isLazy = None # see @var isLazy above class LazyImportError(ImportError): '''Lazy import is not supported, disabled or failed some other way. ''' pass class _NamedEnum_RO(dict): '''(INTERNAL) C{Read_Only} enum-like C{dict} sub-class. ''' # _name = '' # also first kwd, __init__(_name=...) def __getattr__(self, attr): try: return self[attr] except KeyError: raise AttributeError("%s doesn't exist" % (_dot_(self._name, attr),)) # PYCHOK expected def __setattr__(self, attr, value): raise TypeError('Read_Only %s = %r' % (_dot_(self._name, attr), value)) # PYCHOK expected def enums(self): for k, v in dict.items(self): if not k.startswith('_'): # skip _name yield k, v def _ALL_DOCS(*names): '''(INTERNAL) Only export B{C{names}} when making docs to force C{epydoc} to include classes, methods, functions and other names in the documentation. Using C{epydoc --private ...} tends to include too much private documentation. ''' return names if _FOR_DOCS else () _ALL_INIT = 'pygeodesy_abspath', 'version' # __all__ value for most modules, accessible as _ALL_LAZY.<module> _ALL_LAZY = _NamedEnum_RO(_name='_ALL_LAZY', bases=(), # module and for backward compatibility only basics=('EPS', 'EPS1', 'EPS1_2', 'EPS_2', 'INF', 'MANTIS', 'MAX', 'MIN', # constants 'NAN', 'NEG0', 'PI', 'PI2', 'PI_2', 'PI_4', 'R_M', 'LenError', 'LimitError', 'RangeError', 'clips', 'halfs2', 'isfinite', 'isinf', 'isint', 'isnan', 'isneg0', 'isscalar', 'issequence', 'isstr', 'issubclassof', 'len2', 'limiterrors', 'map1', 'map2', 'property_doc_', 'property_RO', 'rangerrors'), clipy=('ClipError', 'clipCS3', 'clipSH', 'clipSH3'), css=('CassiniSoldner', 'Css', 'CSSError', 'toCss'), datum=('R_M', 'R_MA', 'R_MB', 'R_KM', 'R_NM', 'R_SM', 'R_FM', 'R_VM', 'Datum', 'Ellipsoid', 'Transform', 'Datums', 'Ellipsoids', 'Transforms'), deprecated=('OK', # DEPRECATED contants 'HeightIDW', 'HeightIDW2', 'HeightIDW3', 'RefFrameError', # DEPRECATED classes 'anStr', 'areaof', 'bounds', 'clipDMS', 'clipStr', 'decodeEPSG2', 'encodeEPSG', # most of the DEPRECATED functions, ... 'equirectangular3', 'enStr2', 'false2f', 'falsed2f', 'fStr', 'fStrzs', 'hypot3', # ... except ellipsoidal, spherical flavors 'inStr', 'isenclosedby', 'nearestOn3', 'nearestOn4', 'parseUTM', 'perimeterof', 'polygon', 'scalar', 'simplify2', 'toUtm', 'unStr', 'utmZoneBand2'), dms=('F_D', 'F_DM', 'F_DMS', 'F_DEG', 'F_MIN', 'F_SEC', 'F__E', 'F__F', 'F__G', 'F_RAD', 'F_D_', 'F_DM_', 'F_DMS_', 'F_DEG_', 'F_MIN_', 'F_SEC_', 'F__E_', 'F__F_', 'F__G_', 'F_RAD_', 'F_D__', 'F_DM__', 'F_DMS__', 'F_DEG__', 'F_MIN__', 'F_SEC__', 'F__E__', 'F__F__', 'F__G__', 'F_RAD__', 'S_DEG', 'S_MIN', 'S_SEC', 'S_RAD', 'S_SEP', 'ParseError', 'bearingDMS', 'clipDegrees', 'clipRadians', 'compassDMS', 'compassPoint', 'degDMS', 'latDMS', 'lonDMS', 'normDMS', 'parseDDDMMSS', 'parseDMS', 'parseDMS2', 'parse3llh', 'parseRad', 'precision', 'toDMS'), ecef=('EcefCartesian', 'EcefError', 'EcefKarney', 'EcefMatrix', 'EcefVeness', 'EcefYou'), elevations=('elevation2', 'geoidHeight2'), ellipsoidalKarney=(), # module only ellipsoidalNvector=(), # module only ellipsoidalVincenty=('VincentyError',), # nothing else elliptic=('Elliptic', 'EllipticError'), epsg=('Epsg', 'EPSGError'), etm=('Etm', 'ETMError', 'ExactTransverseMercator', 'parseETM5', 'toEtm8'), fmath=('Fdot', 'Fhorner', 'Fpolynomial', 'Fsum', 'acos1', 'cbrt', 'cbrt2', 'favg', 'fdot', 'fdot3', 'fmean', 'fhorner', 'fidw', 'fpolynomial', 'fpowers', 'fprod', 'frange', 'freduce', 'fsum', 'fsum_', 'hypot', 'hypot_', 'hypot1', 'hypot2', 'sqrt3'), formy=('PointsError', 'antipode', 'antipode_', 'bearing', 'bearing_', 'compassAngle', 'cosineLaw', 'cosineLaw_', 'euclidean', 'euclidean_', 'equirectangular', 'equirectangular_', 'flatLocal', 'flatLocal_', 'flatPolar', 'flatPolar_', 'haversine', 'haversine_', 'heightOf', 'horizon', 'isantipode', 'isantipode_', 'latlon2n_xyz', 'n_xyz2latlon', 'n_xyz2philam', 'philam2n_xyz', 'points2', 'vincentys', 'vincentys_'), frechet=('Frechet', 'FrechetCosineLaw', 'FrechetDegrees', 'FrechetError', 'FrechetRadians', 'FrechetEquirectangular', 'FrechetEuclidean', 'FrechetFlatLocal', 'FrechetFlatPolar', 'FrechetHaversine', 'FrechetKarney', 'FrechetVincentys', 'fractional', 'frechet_'), gars=('Garef', 'GARSError'), geohash=('Geohash', 'GeohashError'), geoids=('GeoidError', 'GeoidG2012B', 'GeoidKarney', 'GeoidPGM', 'egmGeoidHeights', 'PGMError'), hausdorff=('Hausdorff', 'HausdorffDegrees', 'HausdorffError', 'HausdorffRadians', 'HausdorffCosineLaw', 'HausdorffEquirectangular', 'HausdorffEuclidean', 'HausdorffFlatLocal', 'HausdorffFlatPolar', 'HausdorffHaversine', 'HausdorffKarney', 'HausdorffVincentys', 'hausdorff_', 'randomrangenerator'), heights=('HeightError', 'SciPyError', 'SciPyWarning', 'HeightIDWcosineLaw', 'HeightIDWequirectangular', 'HeightIDWeuclidean', 'HeightIDWflatLocal', 'HeightIDWflatPolar', 'HeightIDWhaversine', 'HeightIDWkarney', 'HeightIDWvincentys', 'HeightCubic', 'HeightLinear', 'HeightLSQBiSpline', 'HeightSmoothBiSpline'), karney=(), # module only lazily=('LazyImportError', 'isLazy'), lcc=('Conic', 'Conics', 'Lcc', 'LCCError', 'toLcc'), mgrs=('Mgrs', 'MGRSError', 'parseMGRS', 'toMgrs'), named=('classname', 'classnaming', 'modulename', 'nameof'), nvector=(), # module and for backward compatibility only osgr=('Osgr', 'OSGRError', 'parseOSGR', 'toOsgr'), points=('LatLon_', 'LatLon2psxy', 'Numpy2LatLon', 'Tuple2LatLon', 'areaOf', 'boundsOf', 'centroidOf', 'isclockwise', 'isconvex', 'isconvex_', 'isenclosedBy', 'ispolar', 'nearestOn5', 'perimeterOf'), sphericalNvector=(), # module only sphericalTrigonometry=(), # module only simplify=('simplify1', 'simplifyRDP', 'simplifyRDPm', 'simplifyRW', 'simplifyVW', 'simplifyVWm'), streprs=('anstr', 'attrs', 'enstr2', 'fstr', 'fstrzs', 'instr', 'pairs', 'reprs', 'strs', 'unstr'), trf=('RefFrame', 'RefFrames', 'TRFError', 'date2epoch', 'epoch2date'), units=('Bearing', 'Bearing_', 'Degrees', 'Distance', 'Easting', 'Feet', 'Float', 'Float_', 'Height', 'Int', 'Int_', 'Lam', 'Lam_', 'Lat', 'Lon', 'Meter', 'Northing', 'Number_', 'Phi', 'Phi_', 'Precision_', 'Radians', 'Radius', 'Radius_', 'Scalar', 'Scalar_', 'Str', 'UnitError'), ups=('Ups', 'UPSError', 'parseUPS5', 'toUps8', 'upsZoneBand5'), utily=('degrees', 'degrees90', 'degrees180', 'degrees360', 'degrees2m', 'ft2m', 'isNumpy2', 'isPoints2', 'isTuple2', 'iterNumpy2', 'iterNumpy2over', 'm2degrees', 'm2ft', 'm2km', 'm2NM', 'm2SM', 'radians', 'radiansPI', 'radiansPI2', 'radiansPI_2', 'sincos2', 'sincos2d', 'splice', 'tan_2', 'tanPI_2_2', 'unroll180', 'unrollPI', 'wrap90', 'wrap180', 'wrap360', 'wrapPI_2','wrapPI', 'wrapPI2'), utm=('Utm', 'UTMError', 'parseUTM5', 'toUtm8', 'utmZoneBand5'), utmups=('UtmUps', 'UTMUPSError', 'parseUTMUPS5', 'toUtmUps8', 'utmupsValidate', 'utmupsValidateOK', 'utmupsZoneBand5'), vector3d=('CrossError', 'crosserrors', 'VectorError'), # nothing else webmercator=('Wm', 'WebMercatorError', 'parseWM', 'toWm'), wgrs=('Georef', 'WGRSError')) # DEPRECATED __all__ names overloading those in _ALL_LAZY.deprecated where # the new name is fully backward compatible in signature and return value _ALL_OVERRIDING = _NamedEnum_RO(_name='_ALL_OVERRIDING', # all DEPRECATED basics=('clips as clipStr',), fmath=('hypot_ as hypot3',), formy=('points2 as polygon',), heights=('HeightIDWequirectangular as HeightIDW2', 'HeightIDWeuclidean as HeightIDW', 'HeightIDWhaversine as HeightIDW3'), points=('areaOf as areaof', 'isenclosedBy as isenclosedby', 'perimeterOf as perimeterof'), simplify=('simplifyRW as simplify2',), streprs=('anstr as anStr', 'enstr2 as enStr2', 'fstr as fStr', 'fstrzs as fStrzs', 'instr as inStr', 'unstr as unStr')) __all__ = _ALL_LAZY.lazily __version__ = '20.04.26' def _all_imports(**more): '''(INTERNAL) Build C{dict} of all lazy imports. ''' # imports naming conventions stored below - [<key>] = <from>: # import <module> - [<module>] = <module> # from <module> import <attr> - [<attr>] = <module> # from pygeodesy import <attr> - [<attr>] = <attr> # from <module> import <attr> as <name> - [<name>] = <module>.<attr> imports = {} for _all_ in (_ALL_LAZY, _ALL_OVERRIDING, more): for mod, attrs in _all_.items(): if isinstance(attrs, tuple) and not mod.startswith('_'): if mod not in imports: imports[mod] = mod elif imports[mod] != mod: raise AssertionError('%s[%r] vs %r' % ('imports', imports[mod], mod)) for attr in attrs: attr, _, _as_ = attr.partition(' as ') if _as_: imports[_as_] = mod + '.' + attr else: imports[attr] = mod return imports def _all_missing2(_all_): '''(INTERNAL) Get deltas between pygeodesy.__all__ and lazily._all_imports. ''' _alzy = _all_imports(**_NamedEnum_RO((a, ()) for a in _ALL_INIT)) return (('lazily._all_imports', ', '.join(a for a in _all_ if a not in _alzy)), ('pygeodesy.__all__', ', '.join(a for a in _alzy if a not in _all_))) def _dot_(prefix, name): # imported by .__init__, .deprecated, .fmath, .named, etc. '''(INTERNAL) Period-join C{prefix} and C{name}. ''' return prefix + '.' + str(name) def _lazy_import2(_package_): # MCCABE 16 '''Check for and set up lazy importing. @arg _package_: The name of the package (C{str}) performing the imports, to help facilitate resolving relative imports, usually C{__package__}. @return: 2-Tuple C{(package, getattr)} of the importing package for easy reference within itself and the callable to be set to `__getattr__`. @raise LazyImportError: Lazy import not supported, an import failed or a module name or attribute name is invalid or does not exist. @note: This is the original function U{modutil.lazy_import <https://GitHub.com/brettcannon/modutil/blob/master/modutil.py>} modified to handle the C{__all__} and C{__dir__} attributes and call C{importlib.import_module(<module>.<name>, ...)} without causing a C{ModuleNotFoundError}. @see: The original U{modutil<https://PyPi.org/project/modutil>} and U{PEP 562<https://www.Python.org/dev/peps/pep-0562>}. ''' import sys if sys.version_info[:2] < (3, 7): # not supported raise LazyImportError('no %s for Python %s' % (_dot_(_package_, _lazy_import2.__name__), sys.version.split()[0])) import_module, package, parent = _lazy_init3(_package_) if isLazy > 2: # trim import path names import os # PYCHOK re-import cwdir = os.getcwd() cwdir = cwdir[:-len(os.path.basename(cwdir))] del os else: # no import path names cwdir = '' import_ = _dot_(_package_, '') # namespace imports = _all_imports() def __getattr__(name): # __getattr__ only for Python 3.7+ # only called once for each undefined pygeodesy attribute if name in imports: # importlib.import_module() implicitly sets sub-modules # on this module as appropriate for direct imports (see # note in the _lazy_import.__doc__ above). mod, _, attr = imports[name].partition('.') if mod not in imports: raise LazyImportError('no %s %s' % ('module', _dot_(parent, mod))) imported = import_module(import_ + mod, parent) # XXX '.' + mod if imported.__package__ not in (parent, '__main__', ''): raise LazyImportError('%s %r' % (_dot_(mod, '__package__'), imported.__package__)) # import the module or module attribute if attr: imported = getattr(imported, attr, _N_A) elif name != mod: imported = getattr(imported, name, _N_A) if imported is _N_A: raise LazyImportError('no %s %s' % ('attribute', _dot_(mod, attr or name))) elif name in ('__all__',): # XXX '__dir__', '__members__'? imported = _ALL_INIT + tuple(imports.keys()) mod = '' else: raise LazyImportError('no %s %s' % ('module or attribute', _dot_(parent, name))) setattr(package, name, imported) if isLazy > 1: z = '' if mod and mod != name: z = ' from .%s' % (mod,) if isLazy > 2: # sys._getframe(1) ... 'importlib._bootstrap' line 1032, # may throw a ValueError('call stack not deep enough') try: f = sys._getframe(2) # get importing file and line n = f.f_code.co_filename if cwdir and n.startswith(cwdir): n = n[len(cwdir):] z = '%s by %s line %d' % (z, n, f.f_lineno) except ValueError: # PYCHOK no cover pass print('# lazily imported %s%s' % (_dot_(parent, name), z)) return imported # __getattr__ return package, __getattr__ # _lazy_import2 def _lazy_init3(_package_): '''(INTERNAL) Try to initialize lazy import. @arg _package_: The name of the package (C{str}) performing the imports, to help facilitate resolving relative imports, usually C{__package__}. @return: 3-Tuple C{(import_module, package, parent)} of module C{importlib.import_module}, the importing C{package} for easy reference within itself and the package name, aka the C{parent}. @raise LazyImportError: Lazy import not supported, an import failed or a module name or attribute name is invalid or does not exist. @note: Global C{isLazy} is set accordingly. ''' global isLazy z = _environ.get('PYGEODESY_LAZY_IMPORT', None) if z is None: # PYGEODESY_LAZY_IMPORT not set isLazy = 1 # on by default on 3.7 else: z = z.strip() # like PYTHONVERBOSE et.al. isLazy = int(z) if z.isdigit() else (1 if z else 0) if isLazy < 1: # not enabled raise LazyImportError('env %s=%r' % ('PYGEODESY_LAZY_IMPORT', z)) if _environ.get('PYTHONVERBOSE', None): isLazy += 1 try: # to initialize from importlib import import_module package = import_module(_package_) parent = package.__spec__.parent # __spec__ only in Python 3.7+ if parent != _package_: # assertion raise AttributeError('parent %r vs %r' % (parent, _package_)) except (AttributeError, ImportError) as x: # PYCHOK no cover isLazy = False # failed raise LazyImportError('%s failed: %s' % (_lazy_init3.__name__, x)) return import_module, package, parent # **) MIT License # # Copyright (C) 2018-2020 -- 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.