# Coverage for pygeodesy/lazily.py : 95%

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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): '''Raised if C{lazy import} is not supported, disabled or failed some other way. ''' def __init__(self, *name_value, **txt): from pygeodesy.errors import _error_init _error_init(ImportError, self, name_value, **txt) 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', 'clips', 'halfs2', 'isfinite', 'isinf', 'isint', 'isnan', 'isneg0', 'isscalar', 'issequence', 'isstr', 'issubclassof', 'len2', 'map1', 'map2', 'property_doc_', 'property_RO'), 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'), errors=('CrossError', 'LenError', 'LimitError', 'RangeError', 'crosserrors', 'exception_chaining', 'limiterrors', 'rangerrors'), 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=('Band', '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', 'Zone'), 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=('Vector3d', '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__ = '20.05.08' 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: t = 'imports', 'mod', imports[mod], mod raise AssertionError('%s[%s]: %r not %r' % t) 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 t = 'no ' + _dot_(_package_, _lazy_import2.__name__) raise LazyImportError(t, txt='Python ' + 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 module', txt=_dot_(parent, mod)) imported = import_module(import_ + mod, parent) # XXX '.' + mod if imported.__package__ not in (parent, '__main__', ''): raise LazyImportError(_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 attribute', txt=_dot_(mod, attr or name)) elif name in ('__all__',): # XXX '__dir__', '__members__'? imported = _ALL_INIT + tuple(imports.keys()) mod = '' else: raise LazyImportError('no module or attribute', txt=_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 # ... but 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('disabled', txt='%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(_lazy_init3.__name__, _package_, txt=str(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.