# Coverage for pygeodesy/gars.py : 95%

## 150 statements 143 run 7 missing 8 excluded

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Classes L{Garef} and L{GARSError} and several functions to encode, decode and inspect I{Global Area Reference System} (GARS) references. Transcoded from C++ class U{GARS <https://GeographicLib.SourceForge.io/html/classGeographicLib_1_1GARS.html>} by I{Charles Karney}. See also U{Global Area Reference System <https://WikiPedia.org/wiki/Global_Area_Reference_System>} and U{NGA (GARS) <https://Earth-Info.NGA.mil/GandG/coordsys/grids/gars.html>}. ''' from pygeodesy.basics import isstr from pygeodesy.dms import parse3llh # parseDMS2 from pygeodesy.errors import _ValueError, _xkwds from pygeodesy.interns import EPS1_2, NN, _AtoZnoIO_, \ _floatuple, _0to9_, _0_5, _90_0 from pygeodesy.interns import _1_0 # PYCHOK used! from pygeodesy.lazily import _ALL_LAZY, _ALL_OTHER from pygeodesy.named import nameof from pygeodesy.namedTuples import LatLon2Tuple, LatLonPrec3Tuple from pygeodesy.props import Property_RO from pygeodesy.streprs import Fmt from pygeodesy.units import Int_, Lat, Lon, Precision_, Scalar_, \ Str, _xStrError from math import floor __all__ = _ALL_LAZY.gars __version__ = '21.05.26' _Digits = _0to9_ _LatLen = 2 _LatOrig = -90 _Letters = _AtoZnoIO_ _LonLen = 3 _LonOrig = -180 _MaxPrec = 2 _MinLen = _LonLen + _LatLen _MaxLen = _MinLen + _MaxPrec _M1 = 2 _M2 = 2 _M3 = 3 _M_ = _M1 * _M2 * _M3 _LatOrig_M_ = _LatOrig * _M_ _LonOrig_M_ = _LonOrig * _M_ _LatOrig_M1 = _LatOrig * _M1 _LonOrig_M1_1 = _LonOrig * _M1 - 1 _Resolutions = _floatuple(*(_1_0 / _ for _ in (_M1, _M1 * _M2, _M_))) def _2divmod2(ll, Orig_M_): x = int(floor(ll * _M_)) - Orig_M_ i = (x * _M1) // _M_ x -= i * _M_ // _M1 return i, x def _2fll(lat, lon, *unused): '''(INTERNAL) Convert lat, lon. ''' # lat, lon = parseDMS2(lat, lon) return (Lat(lat, Error=GARSError), Lon(lon, Error=GARSError)) # def _2Garef(garef): # '''(INTERNAL) Check or create a L{Garef} instance. # ''' # if not isinstance(garef, Garef): # try: # garef = Garef(garef) # except (TypeError, ValueError): # raise _xStrError(Garef, Str, garef=garef) # return garef def _2garstr2(garef): '''(INTERNAL) Check a garef string. ''' try: n, garstr = len(garef), garef.upper() if n < _MinLen or n > _MaxLen \ or garstr[:3] == 'INV' \ or not garstr.isalnum(): raise ValueError return garstr, _2Precision(n - _MinLen) except (AttributeError, TypeError, ValueError) as x: raise GARSError(Garef.__name__, garef, txt=str(x)) def _2Precision(precision): '''(INTERNAL) Return a L{Precision_} instance. ''' return Precision_(precision, Error=GARSError, low=0, high=_MaxPrec) class GARSError(_ValueError): '''Global Area Reference System (GARS) encode, decode or other L{Garef} issue. ''' pass class Garef(Str): '''Garef class, a named C{str}. ''' # no str.__init__ in Python 3 def __new__(cls, cll, precision=1, name=NN): '''New L{Garef} from an other L{Garef} instance or garef C{str} or from a C{LatLon} instance or lat-/longitude C{str}. @arg cll: Cell or location (L{Garef} or C{str}, C{LatLon} or C{str}). @kwarg precision: Optional, the desired garef resolution and length (C{int} 0..2), see function L{gars.encode} for more details. @kwarg name: Optional name (C{str}). @return: New L{Garef}. @raise RangeError: Invalid B{C{cll}} lat- or longitude. @raise TypeError: Invalid B{C{cll}}. @raise GARSError: INValid or non-alphanumeric B{C{cll}}. ''' ll = p = None if isinstance(cll, Garef): g, p = _2garstr2(str(cll)) elif isstr(cll): if ',' in cll: ll = _2fll(*parse3llh(cll)) g = encode(*ll, precision=precision) # PYCHOK false else: g = cll.upper() else: # assume LatLon try: ll = _2fll(cll.lat, cll.lon) g = encode(*ll, precision=precision) # PYCHOK false except AttributeError: raise _xStrError(Garef, cll=cll) # Error=GARSError self = Str.__new__(cls, g, name=name or nameof(cll)) self._latlon = ll self._precision = p return self @Property_RO def decoded3(self): '''Get this garef's attributes (L{LatLonPrec3Tuple}). ''' lat, lon = self.latlon return LatLonPrec3Tuple(lat, lon, self.precision, name=self.name) @Property_RO def _decoded3(self): '''(INTERNAL) Initial L{LatLonPrec5Tuple}. ''' return decode3(self) @Property_RO def latlon(self): '''Get this garef's (center) lat- and longitude (L{LatLon2Tuple}). ''' lat, lon = self._latlon or self._decoded3[:2] return LatLon2Tuple(lat, lon, name=self.name) @Property_RO def precision(self): '''Get this garef's precision (C{int}). ''' p = self._precision return self._decoded3.precision if p is None else p def toLatLon(self, LatLon, **LatLon_kwds): '''Return (the center of) this garef cell as an instance of the supplied C{LatLon} class. @arg LatLon: Class to use (C{LatLon}). @kwarg LatLon_kwds: Optional keyword arguments for B{C{LatLon}}. @return: This garef location (B{C{LatLon}}). @raise GARSError: Invalid B{C{LatLon}}. ''' if LatLon is None: kwds = _xkwds(LatLon_kwds, LatLon=None, name=self.name) raise GARSError(**kwds) return self._xnamed(LatLon(*self.latlon, **LatLon_kwds)) def decode3(garef, center=True): '''Decode a C{garef} to lat-, longitude and precision. @arg garef: To be decoded (L{Garef} or C{str}). @kwarg center: If C{True} the center, otherwise the south-west, lower-left corner (C{bool}). @return: A L{LatLonPrec3Tuple}C{(lat, lon, precision)}. @raise GARSError: Invalid B{C{garef}}, INValid, non-alphanumeric or bad length B{C{garef}}. ''' def _Error(i): return GARSError(garef=Fmt.SQUARE(repr(garef), i)) def _ll(chars, g, i, j, lo, hi): ll, b = 0, len(chars) for i in range(i, j): d = chars.find(g[i]) if d < 0: raise _Error(i) ll = ll * b + d if ll < lo or ll > hi: raise _Error(j) return ll def _ll2(lon, lat, g, i, m): d = _Digits.find(g[i]) if d < 1 or d > m * m: raise _Error(i) d, r = divmod(d - 1, m) lon = lon * m + r lat = lat * m + (m - 1 - d) return lon, lat g, precision = _2garstr2(garef) lon = _ll(_Digits, g, 0, _LonLen, 1, 720) + _LonOrig_M1_1 lat = _ll(_Letters, g, _LonLen, _MinLen, 0, 359) + _LatOrig_M1 if precision > 0: lon, lat = _ll2(lon, lat, g, _MinLen, _M2) if precision > 1: lon, lat = _ll2(lon, lat, g, _MinLen + 1, _M3) if center: # ll = (ll * 2 + 1) / 2 lon += _0_5 lat += _0_5 r = _Resolutions[precision] # == 1.0 / unit return LatLonPrec3Tuple(Lat(lat * r, Error=GARSError), Lon(lon * r, Error=GARSError), precision, name=nameof(garef)) def encode(lat, lon, precision=1): # MCCABE 14 '''Encode a lat-/longitude as a C{garef} of the given precision. @arg lat: Latitude (C{degrees}). @arg lon: Longitude (C{degrees}). @kwarg precision: Optional, the desired C{garef} resolution and length (C{int} 0..2). @return: The C{garef} (C{str}). @raise RangeError: Invalid B{C{lat}} or B{C{lon}}. @raise GARSError: Invalid B{C{precision}}. @note: The C{garef} length is M{precision + 5} and the C{garef} resolution is B{30′} for B{C{precision}} 0, B{15′} for 1 and B{5′} for 2, respectively. ''' def _digit(x, y, m): return _Digits[m * (m - y - 1) + x + 1], def _str(chars, x, n): s, b = [], len(chars) for i in range(n): x, i = divmod(x, b) s.append(chars[i]) return tuple(reversed(s)) p = _2Precision(precision) lat, lon = _2fll(lat, lon) if lat == _90_0: lat *= EPS1_2 ix, x = _2divmod2(lon, _LonOrig_M_) iy, y = _2divmod2(lat, _LatOrig_M_) g = _str(_Digits, ix + 1, _LonLen) + _str(_Letters, iy, _LatLen) if p > 0: ix, x = divmod(x, _M3) iy, y = divmod(y, _M3) g += _digit(ix, iy, _M2) if p > 1: g += _digit(x, y, _M3) return NN.join(g) def precision(res): '''Determine the L{Garef} precision to meet a required (geographic) resolution. @arg res: The required resolution (C{degrees}). @return: The L{Garef} precision (C{int} 0..2). @raise ValueError: Invalid B{C{res}}. @see: Function L{gars.encode} for more C{precision} details. ''' r = Scalar_(res=res) for p in range(_MaxPrec): if resolution(p) <= r: return p return _MaxPrec def resolution(prec): '''Determine the (geographic) resolution of a given L{Garef} precision. @arg prec: The given precision (C{int}). @return: The (geographic) resolution (C{degrees}). @raise GARSError: Invalid B{C{prec}}. @see: Function L{gars.encode} for more C{precision} details. ''' p = Int_(prec=prec, Error=GARSError, low=-1, high=_MaxPrec + 1) return _Resolutions[max(0, min(p, _MaxPrec))] __all__ += _ALL_OTHER(decode3, # functions encode, precision, resolution) # **) MIT License # # Copyright (C) 2016-2021 -- 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.