1

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

3

4 u'''Lazily import C{pygeodesy} modules and attributes, based on

5 U{lazy_import<https://modutil.ReadTheDocs.io/en/latest/#lazy_import>}

6 from I{Brett Cannon}'s U{modutil<https://PyPI.org/project/modutil>}.

7

8 C{Lazy import} is I{supported only for }U{Python 3.7+

9<https://Snarky.Ca/lazy-importing-in-python-3-7>} and is I{enabled by

10 default} in U{PyGeodesy 18.11.10<https://PyPI.org/project/PyGeodesy>}

11 I{and newer}.

12

13 To I{enable} C{lazy import}, set C{env} variable C{PYGEODESY_LAZY_IMPORT}

14 to C{1}, C{2}, C{3} or higher prior to C{import pygeodesy}. To I{disable}

15 C{lazy import}, set C{env} variable C{PYGEODESY_LAZY_IMPORT} to C{0} or

16 an empty string. Use C{2} or higher to print a message for each lazily

17 imported module and attribute, similar to C{env} variable C{PYTHONVERBOSE}

18 showing imports. Using C{3} or higher also shows the importing file name

19 and line number.

20

21@note: C{Lazy import} applies only to top-level modules of C{pygeodesy}.

22 A C{lazy import} of a top-level module inherently loads all sub-modules

23 imported by that top-level module.

24

25@note: C{Lazy import} raises a L{LazyAttributeError} or L{LazyImportError}

26 depending on the cause of the error and such errors can occur late, after

27 all initial imports.

28'''

29 from pygeodesy.interns import MISSING, NN, __all__ as _interns_a_l_l_, \

30 _areaOf_, _attribute_, _by_, _COLONSPACE_, \

31 _COMMASPACE_, _doesn_t_exist_, _DOT_, _enabled_, \

32 _EQUALSPACED_, _from_, _immutable_, _isclockwise_, \

33 _ispolar_, _line_, _module_, _NL_, _no_, _not_, _or_, \

34 _pygeodesy_, _pygeodesy_abspath_, _Python_, _QUOTE1_, \

35 _QUOTE2_, _SPACE_, _UNDER_, _version_, _dunder_nameof

36

37 from os import getenv as _getenv # in .errors, .geodsolve, .props, .units

38 from os.path import basename as _basename

39 import sys as _sys # in .basics._sizeof

40

41_a_l_l_ = '__all__'

42_FOR_DOCS = _getenv('PYGEODESY_FOR_DOCS', NN) # for epydoc ...

43_from_DOT__ = _SPACE_(NN, _from_, _DOT_)

44_imports_ = 'imports'

45_lazily_ = 'lazily'

46_lazily_imported__ = _SPACE_('#', _lazily_, 'imported', NN)

47_p_a_c_k_a_g_e_ = '__package__'

48_PYGEODESY_LAZY_IMPORT_ = 'PYGEODESY_LAZY_IMPORT'

49_PYTHON_X_DEV = getattr(_sys, '_xoptions', {}).get('dev', # Python 3.2+

50 _getenv('PYTHONDEVMODE', NN)) # PYCHOK exported

51_sub_packages = 'auxilats', 'deprecated', 'geodesicx' # in make._dist

52_sys_version_info2 = _sys.version_info[:2] # in .basics, .fmath, ...

53_WARNINGS_X_DEV = _getenv('PYGEODESY_WARNINGS', NN) and (

54 _PYTHON_X_DEV or bool(_sys.warnoptions)) # PYCHOK .props

55

56# @module_property[_RO?] <https://GitHub.com/jtushman/proxy_tools/>

57 isLazy = None # see @var isLazy in .__init__

58

59 try:

60 from importlib import import_module

61 except ImportError: # Python 2.6-

62

63 def import_module(name, package=None):

64 raise LazyImportError(name=name, package=package,

65 txt=_no_(import_module.__name__))

66

67

68 class LazyAttributeError(AttributeError):

69 '''Raised if a C{lazily imported} attribute is missing or invalid.

70 '''

71 def __init__(self, *name_value, **txt):

72 _ALL_MODS.errors._error_init(AttributeError, self, name_value, **txt)

73

74

75 class LazyImportError(ImportError):

76 '''Raised if C{lazy import} is not supported, disabled or failed some other way.

77 '''

78 def __init__(self, *name_value, **txt):

79 _ALL_MODS.errors._error_init(ImportError, self, name_value, **txt)

80

81

82 class _Dict(dict):

83 '''(INTERNAL) Imports C{dict}.

84 '''

85 def add(self, key, value, *values):

86 '''Add C{[key] = value}, typically C{[attr] = mod}.

87

88 @raise AssertionError: The B{C{key}} already exists

89 with a different B{C{value}}.

90 '''

91 if key in self:

92 val = self[key] # duplicate OK

93 if val != value and val not in values: # PYCHOK no cover

94 k = _ALL_MODS.streprs.Fmt.SQUARE(_imports_, key)

95 t = _COLONSPACE_(k, repr(val))

96 t = _COMMASPACE_(t, _not_(repr(value)))

97 raise AssertionError(t)

98 else:

99 self[key] = value

100

101

102 class _NamedEnum_RO(dict):

103 '''(INTERNAL) C{Read_Only} enum-like C{dict} sub-class.

104 '''

105# _name = NN # also first kwd, __init__(_name=...)

106

107 def _DOT_(self, attr): # PYCHOK no cover

108 return _DOT_(self._name, attr) # PYCHOK _name

109

110 def __getattr__(self, attr):

111 try:

112 return self[attr]

113 except KeyError:

114 t = self._DOT_(attr)

115 raise LazyAttributeError(t, txt=_doesn_t_exist_)

116

117 def __setattr__(self, attr, value): # PYCHOK no cover

118 t = _EQUALSPACED_(self._DOT_(attr), value)

119 raise LazyAttributeError(t, txt=_immutable_)

120

121 def enums(self):

122 for k, v in dict.items(self):

123 if not k.startswith(_UNDER_): # skip _name

124 yield k, v

125

126

127_ALL_INIT = _pygeodesy_abspath_, _version_

128

129# __all__ value for most modules, accessible as _ALL_LAZY.<module>

130_ALL_LAZY = _NamedEnum_RO(_name='_ALL_LAZY',

131 albers=('AlbersEqualArea', 'AlbersEqualArea2', 'AlbersEqualArea4',

132 'AlbersEqualAreaCylindrical', 'AlbersEqualAreaNorth', 'AlbersEqualAreaSouth',

133 'AlbersError', 'Albers7Tuple'),

134 auxilats=(), # no modules: 'auxAngle', 'auxDLat', 'auxDST', 'auxily', 'auxLat'

135 # and no classes: 'Aux', 'AuxAngle', 'AuxBeta', 'AuxChi', 'AuxDLat', 'AuxDST',

136 # 'AuxLat', 'AuxMu', 'AuxPhi', 'AuxTheta', 'AuxXi'

137 azimuthal=('AzimuthalError', 'Azimuthal7Tuple',

138 'Equidistant', 'EquidistantExact', 'EquidistantGeodSolve', 'EquidistantKarney',

139 'Gnomonic', 'GnomonicExact', 'GnomonicGeodSolve', 'GnomonicKarney',

140 'LambertEqualArea', 'Orthographic', 'Stereographic',

141 'equidistant', 'gnomonic'),

142 basics=('clips', 'copysign0', 'copytype', 'halfs2',

143 'isbool', 'isclass', 'iscomplex', 'isfloat',

144 'isidentifier', 'isinstanceof', 'isint', 'iskeyword', 'islistuple', 'isodd',

145 'isscalar', 'issequence', 'isstr', 'issubclassof',

146 'len2', 'map1', 'map2', 'neg', 'neg_',

147 'signBit', 'signOf', 'splice', 'str2ub', 'ub2str', 'unsigned0'),

148 booleans=('BooleanFHP', 'BooleanGH', 'LatLonFHP', 'LatLonGH',

149 'isBoolean'),

150 cartesianBase=(), # module only

151 clipy=('ClipCS4Tuple', 'ClipFHP4Tuple', 'ClipGH4Tuple', 'ClipLB6Tuple', 'ClipSH3Tuple',

152 'clipCS4', 'clipFHP4', 'clipGH4', 'clipLB6', 'clipSH', 'clipSH3'),

153 css=('CassiniSoldner', 'Css', 'CSSError', 'toCss',

154 'EasNorAziRk4Tuple', 'EasNorAziRkEqu6Tuple', 'LatLonAziRk4Tuple'),

155 constants=('DIG', 'EPS', 'EPS0', 'EPS02', 'EPS1', 'EPS2', 'EPS4', 'EPS_2',

156 'INF', 'INT0', 'MANT_DIG', 'MAX', 'MAX_EXP', 'MIN', 'MIN_EXP', 'NAN', 'NEG0', 'NINF',

157 'PI', 'PI2', 'PI_2', 'PI3', 'PI_3', 'PI3_2', 'PI4', 'PI_4',

158 'R_FM', 'R_GM', 'R_KM', 'R_M', 'R_MA', 'R_MB', 'R_NM', 'R_QM', 'R_SM', 'R_VM',

159 'float_', 'float0_', 'isclose', 'isfinite', 'isinf', 'isint0',

160 'isnan', 'isnear0', 'isnear1', 'isnear90', 'isneg0', 'isninf', 'isnon0',

161 'remainder'),

162 datums=('Datum', 'Datums', 'Transform', 'Transforms'),

163 deprecated=('EPS1_2', 'MANTIS', 'OK', # DEPRECATED constants

164 'bases', 'datum', 'nvector', # DEPRECATED modules, see _sub_packages

165 'ClipCS3Tuple', 'EcefCartesian', 'EasNorExact4Tuple', 'HeightIDW', 'HeightIDW2', 'HeightIDW3', # DEPRECATED classes

166 'LatLonExact4Tuple', 'Ned3Tuple', 'RefFrameError', 'Rhumb7Tuple', 'Transform7Tuple', 'UtmUps4Tuple',

167 'anStr', 'areaof', 'bounds', 'clipCS3', 'clipDMS', 'clipStr', 'collins', # most of the DEPRECATED functions, ...

168 'decodeEPSG2', 'encodeEPSG', 'equirectangular3', 'enStr2', # ... except ellipsoidal, spherical flavors

169 'excessAbc', 'excessGirard', 'excessLHuilier',

170 'false2f', 'falsed2f', 'float0', 'fStr', 'fStrzs', 'hypot3',

171 'inStr', 'isDEPRECATED', 'isenclosedby', 'istuplist',

172 'joined', 'joined_', 'nearestOn3', 'nearestOn4', 'parseUTM', 'perimeterof', 'polygon',

173 'scalar', 'simplify2', 'tienstra', 'toUtm', 'unsign0', 'unStr', 'utmZoneBand2'),

174 dms=('F_D', 'F_DM', 'F_DMS', 'F_DEG', 'F_MIN', 'F_SEC', 'F_D60', 'F__E', 'F__F', 'F__G', 'F_RAD',

175 'F_D_', 'F_DM_', 'F_DMS_', 'F_DEG_', 'F_MIN_', 'F_SEC_', 'F_D60_', 'F__E_', 'F__F_', 'F__G_', 'F_RAD_',

176 'F_D__', 'F_DM__', 'F_DMS__', 'F_DEG__', 'F_MIN__', 'F_SEC__', 'F_D60__', 'F__E__', 'F__F__', 'F__G__', 'F_RAD__',

177 'S_DEG', 'S_MIN', 'S_SEC', 'S_DMS', 'S_RAD', 'S_SEP',

178 'bearingDMS', 'clipDegrees', 'clipRadians', 'compassDMS', 'compassPoint',

179 'degDMS', 'latDMS', 'latlonDMS', 'latlonDMS_', 'lonDMS', 'normDMS',

180 'parseDDDMMSS', 'parseDMS', 'parseDMS2', 'parse3llh', 'parseRad', 'precision', 'toDMS'),

181 ecef=('EcefError', 'EcefFarrell21', 'EcefFarrell22', 'EcefKarney', 'EcefMatrix',

182 'EcefSudano', 'Ecef9Tuple', 'EcefVeness', 'EcefYou'),

183 elevations=('Elevation2Tuple', 'GeoidHeight2Tuple',

184 'elevation2', 'geoidHeight2'),

185 ellipsoidalBase=(), # module only

186 ellipsoidalBaseDI=(), # module only

187 ellipsoidalExact=(), # module only

188 ellipsoidalGeodSolve=(), # module only

189 ellipsoidalKarney=(), # module only

190 ellipsoidalNvector=(), # module only

191 ellipsoidalVincenty=('VincentyError',), # nothing else

192 ellipsoids=('a_f2Tuple', 'Circle4Tuple', 'Curvature2Tuple',

193 'Ellipsoid', 'Ellipsoid2', 'Ellipsoids',

194 'a_b2e', 'a_b2e2', 'a_b2e22', 'a_b2e32', 'a_b2f', 'a_b2f_', 'a_b2f2', 'a_b2n',

195 'a_f2b', 'a_f_2b', 'b_f2a', 'b_f_2a',

196 'e2f', 'e22f',

197 'f2e2', 'f2e22', 'f2e32', 'f_2f', 'f2f_', 'f2f2', 'f2n', 'n2e2', 'n2f', 'n2f_'),

198 elliptic=('Elliptic', 'EllipticError', 'Elliptic3Tuple'),

199 epsg=('Epsg', 'EPSGError'),

200 errors=('AuxError', 'ClipError', 'CrossError', 'GeodesicError', 'IntersectionError',

201 'NumPyError', 'LenError', 'LimitError', 'MGRSError',

202 'ParseError', 'PointsError', 'RangeError', 'RhumbError',

203 'SciPyError', 'SciPyWarning', 'TRFError', 'TriangleError', 'UnitError', 'VectorError',

204 'crosserrors', 'exception_chaining', 'isError', 'itemsorted',

205 'limiterrors', 'rangerrors'),

206 etm=('Etm', 'ETMError', 'ExactTransverseMercator',

207 'parseETM5', 'toEtm8'),

208 fmath=('Fdot', 'Fhorner', 'Fhypot', 'Fpolynomial', 'Fpowers', 'Fn_rt', 'Fcbrt', 'Fsqrt',

209 'cbrt', 'cbrt2', 'euclid', 'euclid_',

210 'facos1', 'fasin1', 'fatan', 'fatan1', 'fatan2', 'favg',

211 'fdot', 'fdot3', 'fmean', 'fmean_', 'fhorner', 'fidw', 'fpolynomial',

212 'fpowers', 'fprod', 'frange', 'freduce', 'fremainder',

213 'hypot', 'hypot_', 'hypot1', 'hypot2', 'hypot2_',

214 'norm2', 'norm_', 'sqrt0', 'sqrt3', 'sqrt_a'),

215 formy=('Radical2Tuple',

216 'antipode', 'antipode_', 'bearing', 'bearing_',

217 'compassAngle', 'cosineForsytheAndoyerLambert', 'cosineForsytheAndoyerLambert_',

218 'cosineAndoyerLambert', 'cosineAndoyerLambert_', 'cosineLaw', 'cosineLaw_',

219 'equirectangular', 'equirectangular_', 'euclidean', 'euclidean_',

220 'excessAbc_', 'excessCagnoli_', 'excessGirard_', 'excessLHuilier_',

221 'excessKarney', 'excessKarney_', 'excessQuad', 'excessQuad_',

222 'flatLocal', 'flatLocal_', 'flatPolar', 'flatPolar_',

223 'hartzell', 'haversine', 'haversine_', 'heightOf', 'heightOrthometric', 'horizon', 'hubeny', 'hubeny_',

224 'intersection2', 'intersections2', 'isantipode', 'isantipode_', 'isnormal', 'isnormal_',

225 'latlon2n_xyz', 'normal', 'normal_', 'n_xyz2latlon', 'n_xyz2philam',

226 'opposing', 'opposing_', 'philam2n_xyz',

227 'radical2', 'thomas', 'thomas_', 'vincentys', 'vincentys_'),

228 frechet=('Frechet', 'FrechetDegrees', 'FrechetError', 'FrechetRadians',

229 'FrechetCosineAndoyerLambert', 'FrechetCosineForsytheAndoyerLambert',

230 'FrechetCosineLaw', 'FrechetDistanceTo', 'FrechetEquirectangular',

231 'FrechetEuclidean', 'FrechetExact', 'FrechetFlatLocal', 'FrechetFlatPolar',

232 'FrechetHaversine', 'FrechetHubeny', 'FrechetKarney', 'FrechetThomas',

233 'FrechetVincentys', 'Frechet6Tuple',

234 'frechet_'),

235 fstats=('Fcook', 'Flinear', 'Fwelford'),

236 fsums=('Fsum', 'Fsum2Tuple', 'ResidualError',

237 'fsum', 'fsum_', 'fsumf_', 'fsum1', 'fsum1_', 'fsum1f_'),

238 gars=('Garef', 'GARSError'),

239 geodesicw=('Geodesic', 'GeodesicLine', 'Geodesic_WGS84'),

240 geodesicx=('gx', 'gxarea', 'gxbases', 'gxline', # modules, see _sub_packages

241 'GeodesicAreaExact', 'GeodesicExact', 'GeodesicLineExact', 'PolygonArea'),

242 geodsolve=('GeodesicSolve', 'GeodesicLineSolve', 'GeodSolve12Tuple'),

243 geohash=('Geohash', 'GeohashError', 'Neighbors8Dict', 'Resolutions2Tuple'),

244 geoids=('GeoidError', 'GeoidG2012B', 'GeoidKarney', 'GeoidPGM', 'egmGeoidHeights',

245 'PGMError', 'GeoidHeight5Tuple'),

246 hausdorff=('Hausdorff', 'HausdorffDegrees', 'HausdorffError', 'HausdorffRadians',

247 'HausdorffCosineAndoyerLambert', 'HausdorffCosineForsytheAndoyerLambert',

248 'HausdorffCosineLaw', 'HausdorffDistanceTo', 'HausdorffEquirectangular',

249 'HausdorffEuclidean', 'HausdorffExact', 'HausdorffFlatLocal', 'HausdorffFlatPolar',

250 'HausdorffHaversine', 'HausdorffHubeny', 'HausdorffKarney', 'HausdorffThomas',

251 'HausdorffVincentys', 'Hausdorff6Tuple',

252 'hausdorff_', 'randomrangenerator'),

253 heights=('HeightCubic', 'HeightError',

254 'HeightIDWcosineAndoyerLambert', 'HeightIDWcosineForsytheAndoyerLambert',

255 'HeightIDWcosineLaw', 'HeightIDWdistanceTo', 'HeightIDWequirectangular',

256 'HeightIDWeuclidean', 'HeightIDWexact', 'HeightIDWflatLocal', 'HeightIDWflatPolar',

257 'HeightIDWhaversine', 'HeightIDWhubeny', 'HeightIDWkarney', 'HeightIDWthomas',

258 'HeightIDWvincentys', 'HeightLinear', 'HeightLSQBiSpline', 'HeightSmoothBiSpline'),

259 interns=_interns_a_l_l_,

260 iters=('LatLon2PsxyIter', 'PointsIter', 'points2',

261 'isNumpy2', 'isPoints2', 'isTuple2', 'iterNumpy2', 'iterNumpy2over'),

262 karney=('Area3Tuple', 'Caps', 'Direct9Tuple', 'GDict', 'Inverse10Tuple', 'Rhumb8Tuple'),

263 ktm=('KTMError', 'KTransverseMercator'),

264 latlonBase=(), # module only

265 lazily=('LazyAttributeError', 'LazyImportError', 'isLazy', 'print_', 'printf'),

266 lcc=('Conic', 'Conics', 'Lcc', 'LCCError', 'toLcc'),

267 ltp=('Attitude', 'AttitudeError', 'ChLV', 'ChLVa', 'ChLVe', 'Frustum',

268 'LocalCartesian', 'LocalError', 'Ltp', 'tyr3d'),

269 ltpTuples=('Aer', 'Aer4Tuple', 'Attitude4Tuple',

270 'ChLVEN2Tuple', 'ChLV9Tuple', 'ChLVYX2Tuple', 'ChLVyx2Tuple',

271 'Enu', 'Enu4Tuple', 'Footprint5Tuple', 'Local9Tuple',

272 'Ned', 'Ned4Tuple', 'XyzLocal', 'Xyz4Tuple'),

273 mgrs=('Mgrs', 'parseMGRS', 'toMgrs', 'Mgrs4Tuple', 'Mgrs6Tuple'),

274 named=('callername', 'classname', 'classnaming', 'modulename',

275 'nameof', 'notImplemented', 'notOverloaded'),

276 namedTuples=('Bearing2Tuple', 'Bounds2Tuple', 'Bounds4Tuple',

277 'Destination2Tuple', 'Destination3Tuple',

278 'Distance2Tuple', 'Distance3Tuple', 'Distance4Tuple',

279 'EasNor2Tuple', 'EasNor3Tuple', 'Forward4Tuple', 'Intersection3Tuple',

280 'LatLon2Tuple', 'LatLon3Tuple', 'LatLon4Tuple',

281 'LatLonDatum3Tuple', 'LatLonDatum5Tuple',

282 'LatLonPrec3Tuple', 'LatLonPrec5Tuple',

283 'NearestOn2Tuple', 'NearestOn3Tuple', 'NearestOn4Tuple',

284 'NearestOn5Tuple', 'NearestOn6Tuple', 'NearestOn8Tuple',

285 'PhiLam2Tuple', 'PhiLam3Tuple', 'PhiLam4Tuple', 'Point3Tuple', 'Points2Tuple',

286 'Reverse4Tuple', 'Triangle7Tuple', 'Triangle8Tuple', 'Trilaterate5Tuple',

287 'UtmUps2Tuple', 'UtmUps5Tuple', 'UtmUps8Tuple', 'UtmUpsLatLon5Tuple',

288 'Vector2Tuple', 'Vector3Tuple', 'Vector4Tuple'),

289 nvectorBase=(), # module only

290 osgr=('Osgr', 'OSGRError', 'parseOSGR', 'toOsgr'),

291 points=('LatLon_', 'LatLon2psxy', 'Numpy2LatLon', 'Shape2Tuple', 'Tuple2LatLon',

292 _areaOf_, 'boundsOf', 'centroidOf', 'fractional',

293 _isclockwise_, 'isconvex', 'isconvex_', 'isenclosedBy', _ispolar_,

294 'luneOf', 'nearestOn5', 'perimeterOf', 'quadOf'),

295 props=('Property', 'Property_RO', 'property_RO', 'property_doc_',

296 'deprecated_class', 'deprecated_function', 'deprecated_method',

297 'deprecated_Property_RO', 'deprecated_property_RO', 'DeprecationWarnings'),

298 resections=('Collins5Tuple', 'ResectionError', 'Survey3Tuple', 'Tienstra7Tuple',

299 'TriAngle4Tuple', 'TriSide2Tuple', 'TriSide4Tuple',

300 'cassini', 'collins5', 'pierlot', 'pierlotx', 'tienstra7',

301 'snellius3', 'wildberger3',

302 'triAngle', 'triAngle4', 'triSide', 'triSide2', 'triSide4'),

303 rhumbaux=('RhumbAux', 'RhumbLineAux'),

304 rhumbBase=(), # module only

305 rhumbsolve=('RhumbSolve', 'RhumbLineSolve', 'RhumbSolve7Tuple'),

306 rhumbx=('Rhumb', 'RhumbLine', 'RhumbOrder2Tuple',),

307 sphericalBase=(), # module only

308 sphericalNvector=(), # module only

309 sphericalTrigonometry=(), # module only

310 simplify=('simplify1', 'simplifyRDP', 'simplifyRDPm', 'simplifyRW', 'simplifyVW', 'simplifyVWm'),

311 solveBase=(), # module only

312 streprs=('anstr', 'attrs', 'enstr2', 'fstr', 'fstrzs', 'hstr', 'instr',

313 'lrstrip', 'pairs', 'reprs', 'strs', 'unstr'),

314 trf=('Helmert7Tuple', 'RefFrame', 'RefFrames',

315 'date2epoch', 'epoch2date', 'trfXform'),

316 triaxials=('BetaOmega2Tuple', 'BetaOmega3Tuple', 'Jacobi2Tuple',

317 'JacobiConformal', 'JacobiConformalSpherical',

318 'Triaxial', 'Triaxial_', 'TriaxialError', 'Triaxials', 'hartzell4'),

319 units=('Band', 'Bearing', 'Bearing_', 'Bool',

320 'Degrees', 'Degrees_', 'Degrees2', 'Distance', 'Distance_', 'Easting', 'Epoch',

321 'Feet', 'FIx', 'Float_', 'Height', 'Height_', 'HeightX', 'Int_',

322 'Lam', 'Lam_', 'Lat', 'Lat_', 'Lon', 'Lon_',

323 'Meter', 'Meter_', 'Meter2', 'Meter3', 'Northing', 'Number_',

324 'Phi', 'Phi_', 'Precision_', 'Radians', 'Radians_', 'Radians2',

325 'Radius_', 'Scalar', 'Scalar_', 'Zone'),

326 unitsBase=('Float', 'Int', 'Radius', 'Str'),

327 ups=('Ups', 'UPSError', 'parseUPS5', 'toUps8', 'upsZoneBand5'),

328 utily=('acos1', 'acre2ha', 'acre2m2', 'asin1', 'atand', 'atan2b', 'atan2d',

329 'chain2m', 'circle4', 'cot', 'cot_', 'cotd', 'cotd_',

330 'degrees', 'degrees90', 'degrees180', 'degrees360', 'degrees2grades', 'degrees2m',

331# 'degrees2grades as degrees2gons',

332 'fathom2m', 'ft2m', 'furlong2m',

333 'grades', 'grades400', 'grades2degrees', 'grades2radians',

334# 'grades as gons', 'grades400 as gons400', 'grades2degrees as gons2degrees', 'grades2radians as gons2radians',

335 'km2m', 'm2chain', 'm2degrees', 'm2fathom', 'm2ft', 'm2furlong',

336 'm2km', 'm2NM', 'm2radians', 'm2SM', 'm2toise', 'm2yard', 'NM2m',

337 'radians', 'radiansPI', 'radiansPI2', 'radiansPI_2', 'radians2m',

338 'sincos2', 'SinCos2', 'sincos2_', 'sincos2d', 'sincos2d_', 'sincostan3', 'SM2m',

339 'tand', 'tand_', 'tan_2', 'tanPI_2_2', 'toise2m', 'truncate',

340 'unroll180', 'unrollPI',

341 'wrap90', 'wrap180', 'wrap360', 'wrapPI_2', 'wrapPI', 'wrapPI2', 'wrap_normal',

342 'yard2m'),

343 utm=('Utm', 'UTMError', 'parseUTM5', 'toUtm8', 'utmZoneBand5'),

344 utmups=('UtmUps', 'UTMUPSError', 'parseUTMUPS5', 'toUtmUps8',

345 'utmupsValidate', 'utmupsValidateOK', 'utmupsZoneBand5'),

346 utmupsBase=(), # module only

347 vector2d=('Circin6Tuple', 'Circum3Tuple', 'Circum4Tuple', 'Meeus2Tuple', 'Radii11Tuple', 'Soddy4Tuple',

348 'circin6', 'circum3', 'circum4_', 'meeus2', 'radii11', 'soddy4'),

349 vector3d=('Vector3d', 'intersection3d3', 'iscolinearWith', 'nearestOn', 'nearestOn6', 'parse3d',

350 'trilaterate2d2', 'trilaterate3d2'),

351 vector3dBase=(), # module only

352 webmercator=('Wm', 'WebMercatorError', 'parseWM', 'toWm', 'EasNorRadius3Tuple'),

353 wgrs=('Georef', 'WGRSError'))

354

355# DEPRECATED __all__ names overloading those in _ALL_LAZY.deprecated where

356# the new name is fully backward compatible in signature and return value

357_ALL_OVERRIDDEN = _NamedEnum_RO(_name='_ALL_OVERRIDING', # all DEPRECATED

358 basics=('clips as clipStr',),

359 fmath=('hypot_ as hypot3',),

360 formy=('points2 as polygon',),

361 heights=('HeightIDWequirectangular as HeightIDW2', 'HeightIDWeuclidean as HeightIDW',

362 'HeightIDWhaversine as HeightIDW3'),

363 points=('areaOf as areaof',

364 'isenclosedBy as isenclosedby', 'perimeterOf as perimeterof'),

365 simplify=('simplifyRW as simplify2',),

366 streprs=('anstr as anStr', 'enstr2 as enStr2', 'fstr as fStr', 'fstrzs as fStrzs',

367 'instr as inStr', 'unstr as unStr'))

368

369

370 class _ALL_MODS(object):

371 '''(INTERNAL) Memoize import of any L{pygeodesy} module.

372 '''

373 def _DOT_(self, name): # PYCHOK no cover

374 return _DOT_(self.__class__.__name__, name)

375

376 def __getattr__(self, name):

377 '''Get a C{pygeodesy} module or attribute by B{C{name}}.

378

379 @arg name: Unqualified module or attribute name (C{str}).

380 '''

381 try:

382 return self.getmodule(name if name == _pygeodesy_ else

383 _DOT_(_pygeodesy_, name))

384 except ImportError as x:

385 raise LazyImportError(str(x), txt=_doesn_t_exist_, cause=x)

386

387 def __setattr__(self, name, value): # PYCHOK no cover

388 t = _EQUALSPACED_(self._DOT_(name), repr(value))

389 raise LazyAttributeError(t, txt=_immutable_)

390

391 def getattr(self, module_name, name, *dflt):

392 '''Get an attribute of a C{pygeodesy} module.

393

394 @arg module_name: Un- or qualified module name (C{str}).

395 @arg name: Attribute name (C{str}).

396

397 @return: The C{pygeodesy} module's attribute.

398

399 @raise AttributeError: No attribute with that B{C{name}}.

400

401 @raise ImportError: Importing B{C{module_name}} failed.

402 '''

403 n = module_name

404 if n.split(_DOT_, 1)[0] != _pygeodesy_:

405 n = _DOT_(_pygeodesy_, n)

406 m = self.getmodule(n)

407 try:

408 return m if name in (None, NN) else (

409 getattr(m, name, *dflt) if dflt else getattr(m, name))

410 except (AttributeError, TypeError) as x:

411 raise LazyAttributeError(_DOT_(m, n), cause=x)

412

413 def getmodule(self, name):

414 '''Get a C{pygeodesy} module.

415

416 @arg name: Qualified module name (C{str}).

417

418 @return: The C{pygeodesy} module.

419

420 @raise ImportError: Importing module B{C{name}} failed.

421 '''

422 try:

423 return _sys.modules[name]

424 except KeyError:

425 return import_module(name, _pygeodesy_)

426

427# def _imported(self, name, module): # in _lazy_import2 below

428# try:

429# if name not in _sys.modules:

430# _sys.modules[name] = module

431# except (AttributeError, KeyError):

432# pass

433# return module

434

435 def items(self): # no module named 'items'

436 '''Yield the modules imported so far.

437 '''

438 for n, m in _sys.modules.items():

439 yield n, m

440

441_ALL_MODS = _ALL_MODS() # PYCHOK singleton

442

443__all__ = _ALL_LAZY.lazily

444__version__ = '23.08.22'

445

446

447 def _ALL_OTHER(*objs):

448 '''(INTERNAL) Get class and function B{C{objs}} for __all__.

449 '''

450 _interns = _ALL_MODS.interns # from pygeodesy import interns

451

452 def _interned(o): # get base name

453 n = _dunder_nameof(o).rsplit(_DOT_, 1)[-1]

454 i = NN(_UNDER_, n, _UNDER_) # intern'd

455 return getattr(_interns, i, n)

456

457 return tuple(map(_interned, objs)) # map2

458

459

460 if _FOR_DOCS:

461 _ALL_DOCS = _ALL_OTHER

462 # (INTERNAL) Only export B{C{objs.__name__}} when making the

463 # docs to force C{epydoc} to include certain classes, methods,

464 # functions and other names in the documentation. Using the

465 # C{epydoc --private ...} command line option tends to include

466 # too much internal documentation.

467 else:

468 def _ALL_DOCS(*unused):

469 return ()

470

471

472 def _all_imports(**more):

473 '''(INTERNAL) Build C{dict} of all lazy imports.

474 '''

475 # imports naming conventions stored below - [<key>] = <from>:

476 # import <module> - [<module>] = <module>

477 # from <module> import <attr> - [<attr>] = <module>

478 # from pygeodesy import <attr> - [<attr>] = <attr>

479 # from <module> import <attr> as <name> - [<name>] = <module>.<attr>

480 imports = _Dict()

481 _add = imports.add

482

483 for ALL in (_ALL_LAZY, _ALL_OVERRIDDEN, more):

484 for mod, attrs in ALL.items():

485 if isinstance(attrs, tuple) and not mod.startswith(_UNDER_):

486 _add(mod, mod)

487 for attr in attrs:

488 attr, _, as_attr = attr.partition(' as ')

489 if as_attr:

490 _add(as_attr, _DOT_(mod, attr), *_sub_packages)

491 else:

492 _add(attr, mod)

493 return imports

494

495

496 def _all_missing2(_all_):

497 '''(INTERNAL) Get diffs between pygeodesy.__all__ and lazily._all_imports.

498 '''

499 def _diff(one, two):

500 return _COMMASPACE_.join(a for a in one if a not in two)

501

502 _alzy = _all_imports(**_NamedEnum_RO((a, ()) for a in _ALL_INIT))

503 return ((_DOT_(_lazily_, _all_imports.__name__), _diff(_all_, _alzy)),

504 (_DOT_(_pygeodesy_, _a_l_l_), _diff(_alzy, _all_)))

505

506

507 def _caller3(up): # in .named

508 '''(INTERNAL) Get 3-tuple C{(caller name, file name, line number)}

509 for the caller B{C{up}} stack frames in the Python call stack.

510 '''

511 # sys._getframe(1) ... 'importlib._bootstrap' line 1032,

512 # may throw a ValueError('call stack not deep enough')

513 f = _sys._getframe(up + 1)

514 return (f.f_code.co_name, # caller name

515 _basename(f.f_code.co_filename), # file name

516 f.f_lineno) # line number

517

518

519 def _lazy_import2(package_name): # MCCABE 14

520 '''Check for and set up C{lazy import}.

521

522 @arg package_name: The name of the package (C{str}) performing

523 the imports, to help facilitate resolving

524 relative imports, usually C{__package__}.

525

526 @return: 2-Tuple C{(package, getattr)} of the importing package

527 for easy reference within itself and the callable to

528 be set to `__getattr__`.

529

530 @raise LazyAttributeError: The package, module or attribute

531 name is invalid or does not exist.

532

533 @raise LazyImportError: Lazy import not supported or not enabled

534 or an import failed.

535

536 @note: This is the original function U{modutil.lazy_import

537 <https://GitHub.com/brettcannon/modutil/blob/master/modutil.py>}

538 modified to handle the C{__all__} and C{__dir__} attributes

539 and call C{importlib.import_module(<module>.<name>, ...)}

540 without causing a C{ModuleNotFoundError}.

541

542 @see: The original U{modutil<https://PyPI.org/project/modutil>},

543 U{PEP 562<https://www.Python.org/dev/peps/pep-0562>} and the

544 U{new way<https://Snarky.Ca/lazy-importing-in-python-3-7/>}.

545 '''

546 if package_name != _pygeodesy_ or _sys_version_info2 < (3, 7): # not supported before 3.7

547 t = _no_(_DOT_(package_name, _lazy_import2.__name__)) # PYCHOK no cover

548 raise LazyImportError(t, txt=_Python_(_sys.version))

549

550 package, parent = _lazy_init2(_pygeodesy_)

551

552 packages = (parent, '__main__', NN) + tuple(

553 _DOT_(parent, s) for s in _sub_packages)

554 imports = _all_imports()

555

556 def __getattr__(name): # __getattr__ only for Python 3.7+

557 # only called once for each undefined pygeodesy attribute

558 if name in imports:

559 # importlib.import_module() implicitly sets sub-modules

560 # on this module as appropriate for direct imports (see

561 # note in the _lazy_import2.__doc__ above).

562 mod, _, attr = imports[name].partition(_DOT_)

563 if mod not in imports:

564 # <https://GitHub.com/mrJean1/PyGeodesy/issues/76>

565 raise LazyAttributeError(_no_(_module_), txt=_DOT_(parent, mod))

566 imported = import_module(_DOT_(_pygeodesy_, mod), parent)

567 pkg = getattr(imported, _p_a_c_k_a_g_e_, None)

568 if pkg not in packages: # invalid package

569 raise LazyImportError(_DOT_(mod, _p_a_c_k_a_g_e_), pkg)

570 # _ALL_MODS._imported(mod, imported)

571 # import the module or module attribute

572 if attr:

573 imported = getattr(imported, attr, MISSING)

574 elif name != mod:

575 imported = getattr(imported, name, MISSING)

576 if imported is MISSING: # PYCHOK no cover

577 t = _DOT_(mod, attr or name)

578 # <https://GitHub.com/mrJean1/PyGeodesy/issues/76>

579 raise LazyAttributeError(_no_(_attribute_), txt=t)

580

581 elif name in (_a_l_l_,): # XXX '_d_i_r_', '_m_e_m_b_e_r_s_'?

582 imported = _ALL_INIT + tuple(imports.keys())

583 mod = NN

584 else: # PYCHOK no cover

585 t = _no_(_module_, _or_, _attribute_)

586 # <https://GitHub.com/mrJean1/PyGeodesy/issues/76>

587 raise LazyAttributeError(t, txt=_DOT_(parent, name))

588

589 setattr(package, name, imported)

590 if isLazy > 1:

591 t = NN(_lazily_imported__, _DOT_(parent, name))

592 if mod and mod != name:

593 t = NN(t, _from_DOT__, mod)

594 if isLazy > 2:

595 try: # see C{_caller3}

596 _, f, s = _caller3(2)

597 t = _SPACE_(t, _by_, f, _line_, s)

598 except ValueError:

599 pass

600 printf(t) # XXX print

601

602 return imported # __getattr__

603

604 return package, __getattr__ # _lazy_import2

605

606

607 def _lazy_init2(package_name):

608 '''(INTERNAL) Try to initialize lazy import.

609

610 @arg package_name: The name of the package (C{str}) performing

611 the imports, to help facilitate resolving

612 relative imports, usually C{__package__}.

613

614 @return: 2-Tuple C{(package, parent)} of the importing C{package}

615 for easy reference within itself and its name aka the

616 C{parent}, same as B{C{package_name}}.

617

618 @raise LazyImportError: Lazy import not supported or not enabled,

619 an import failed or the package name is

620 invalid or does not exist.

621

622 @note: Global C{isLazy} is set accordingly.

623 '''

624 global isLazy

625

626 z = _getenv(_PYGEODESY_LAZY_IMPORT_, None)

627 if z is None: # _PYGEODESY_LAZY_IMPORT_ not set

628 isLazy = 1 # ... but only by default on 3.7

629 else:

630 z = z.strip() # like PYTHONVERBOSE et.al.

631 isLazy = int(z) if z.isdigit() else (1 if z else 0)

632 if isLazy < 1: # not enabled

633 raise LazyImportError(_PYGEODESY_LAZY_IMPORT_, repr(z), txt=_not_(_enabled_))

634 if _getenv('PYTHONVERBOSE', None): # PYCHOK no cover

635 isLazy += 1

636

637 try: # to initialize in Python 3+

638 package = import_module(package_name)

639 parent = package.__spec__.parent # __spec__ only in Python 3.7+

640 if parent != package_name: # assert

641 t = _COMMASPACE_(parent, _not_(package_name)) # PYCHOK no cover

642 raise AttributeError(_EQUALSPACED_('parent', t))

643

644 except (AttributeError, ImportError) as x:

645 isLazy = False # failed

646 raise LazyImportError(_lazy_init2.__name__, package_name, cause=x)

647

648 return package, parent

649

650

651 def _pairs(*args, **kwds): # in .errors, .ktm

652 # from pygeodesy.streprs import pairs

653 return _ALL_MODS.streprs.pairs(*args, **kwds)

654

655

656 def print_(*args, **nl_nt_prefix_end_file_flush_sep): # PYCHOK no cover

657 '''Python 3+ C{print}-like formatting and printing.

658

659 @arg args: Arguments to be converted to C{str} and joined by B{C{sep}}

660 (C{any} type, all positional).

661 @kwarg nl_nt_prefix_end_file_flush_sep: Keyword arguments C{B{nl}=0}

662 for the number of leading blank lines (C{int}), C{B{nt}=0}

663 the number of trailing blank lines (C{int}), C{B{prefix}=NN}

664 to be inserted before the formatted text (C{str}) and Python

665 3+ C{print} keyword arguments C{B{end}}, C{B{sep}}, C{B{file}}

666 and C{B{flush}}.

667

668 @return: Number of bytes written.

669 '''

670 return printf(NN, *args, **nl_nt_prefix_end_file_flush_sep)

671

672

673 def printf(fmt, *args, **nl_nt_prefix_end_file_flush_sep_kwds):

674 '''C{Printf-style} and Python 3+ C{print}-like formatting and printing.

675

676 @arg fmt: U{Printf-style<https://Docs.Python.org/3/library/stdtypes.html#

677 printf-style-string-formatting>} format specification (C{str}).

678 @arg args: Arguments to be formatted (C{any} types, all positional).

679 @kwarg nl_nt_prefix_end_file_flush_sep_kwds: Keyword arguments C{B{nl}=0}

680 for the number of leading blank lines (C{int}), C{B{nt}=0} the

681 number of trailing blank lines (C{int}), C{B{prefix}=NN} to

682 be inserted before the formatted text (C{str}) and Python 3+

683 C{print} keyword arguments C{B{end}}, C{B{sep}}, C{B{file}} and

684 C{B{flush}}. Any remaining C{B{kwds}} are U{printf-style

685 <https://Docs.Python.org/3/library/stdtypes.html#printf-style-string-formatting>}

686 keyword arguments to be formatted, I{iff no B{C{args}} are present}.

687

688 @return: Number of bytes written.

689 '''

690 b, e, s, f, fl, p, kwds = _xprint7(**nl_nt_prefix_end_file_flush_sep_kwds)

691 try:

692 if args:

693 t = (fmt % args) if fmt else s.join(map(str, args))

694 elif kwds: # PYCHOK no cover

695 t = (fmt % kwds) if fmt else s.join(_pairs(kwds, prec=p))

696 else: # PYCHOK no cover

697 t = fmt

698 except Exception as x:

699 _E, t = _ALL_MODS.errors._xError2(x)

700 unstr = _ALL_MODS.streprs.unstr

701 raise _E(t, txt=unstr(printf, fmt, *args, **

702 nl_nt_prefix_end_file_flush_sep_kwds))

703 try:

704 n = f.write(NN(b, t, e))

705 except UnicodeEncodeError: # XXX only Windows

706 t = t.replace('\u2032', _QUOTE1_).replace('\u2033', _QUOTE2_)

707 n = f.write(NN(b, t, e))

708 if fl:

709 f.flush()

710 return n

711

712

713 def _xprint7(nl=0, nt=0, prec=6, prefix=NN, sep=_SPACE_, file=_sys.stdout,

714 end=_NL_, flush=False, **kwds):

715 '''(INTERNAL) Unravel the C{printf} and remaining keyword arguments.

716 '''

717 if nl > 0:

718 prefix = NN(_NL_ * nl, prefix)

719 if nt > 0:

720 end = NN(end, _NL_ * nt)

721 return prefix, end, sep, file, flush, prec, kwds

722

723

724 if __name__ == '__main__':

725

726 from timeit import timeit

727

728 def t1():

729 from pygeodesy.trf import RefFrame

730 return RefFrame

731

732 def t2():

733 return _ALL_MODS.trf.RefFrame

734

735 t1(); t2() # PYCHOK prime each

736

737 t1 = timeit(t1, number=1000000)

738 t2 = timeit(t2, number=1000000)

739 v = _Python_(_sys.version)

740 printf('%.8f import vs %.8f _ALL_MODS: %.3fX, %s', t1, t2, t2 / t1, v)

741

742# % python3.11 -W ignore -m pygeodesy.lazily

743# 0.31956017 import vs 0.52837638 _ALL_MODS: 1.653X, Python 3.11.0rc1

744

745# % python3.10 -W ignore -m pygeodesy.lazily

746# 0.31828208 import vs 0.58981700 _ALL_MODS: 1.853X, Python 3.10.5

747

748# % python2 -m pygeodesy.lazily

749# 1.19996715 import vs 1.39310884 _ALL_MODS: 1.161X, Python 2.7.18

750

751# **) MIT License

752#

753# Copyright (C) 2018-2023 -- mrJean1 at Gmail -- All Rights Reserved.

754#

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

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

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

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

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

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

761#

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

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

764#

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

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

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

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

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

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

771# OTHER DEALINGS IN THE SOFTWARE.