# Coverage for pygeodesy/iters.py : 95%

## 179 statements 170 run 9 missing 11 excluded

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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 | # -*- coding: utf-8 -*- u'''Iterator classes L{LatLon2PsxyIter} and L{PointsIter} to iterate over iterables, lists, sets, tuples, etc. with optional loop-back to the initial items, skipping of duplicate items and copying of the iterated items. @newfield example: Example, Examples ''' from pygeodesy.basics import issubclassof, len2, map2 from pygeodesy.errors import _IndexError, LenError, PointsError from pygeodesy.interns import NN, _few_, _points_, _too_, _0_, _1_0 from pygeodesy.lazily import _ALL_LAZY, _ALL_DOCS from pygeodesy.named import _Named from pygeodesy.namedTuples import Point3Tuple, Points2Tuple from pygeodesy.props import property_RO from pygeodesy.streprs import Fmt from pygeodesy.units import Int, Radius from pygeodesy.utily import degrees2m, isNumpy2, isTuple2, wrap90, wrap180 __all__ = _ALL_LAZY.iters __version__ = '21.02.12' _items_ = 'items' class _BaseIter(_Named): '''(INTERNAL) Iterator over items with loop-back and de-duplication. @see: Luciano Ramalho, "Fluent Python", page 418+, O'Reilly, 2016. ''' _closed = True _copies = () _dedup = False _Error = LenError _items = None _loop = () _name = _items_ _prev = object() def __init__(self, items, loop=0, dedup=False, Error=None, name=NN): '''New iterator over an iterable of B{C{items}}. @arg items: Iterable (any C{type}). @kwarg loop: Number of loop-back items, also initial enumerate and iterate index (non-negative C{int}). @kwarg dedup: Skip duplicate items (C{bool}). @kwarg Error: Error to raise (L{LenError}). @kwarg name: Optional name (C{str}). @raise Error: Insufficient number of B{C{items}}. ''' if dedup: self._dedup = True if issubclassof(Error, Exception): self._Error = Error if name: self.rename(name) if isinstance(items, (list, tuple)): # range in Python 2 self._items = items self._iter = iter(items) self._indx = -1 if Int(loop) > 0: try: self._loop = tuple(self.next for _ in range(loop)) if self.loop != loop: raise RuntimeError # force Error except (RuntimeError, StopIteration): raise self._Error(self.name, self.loop, txt=_too_(_few_)) @property_RO def copies(self): '''Get the saved copies, if any (C{tuple} or C{list}) and only I{once}. ''' cs = self._copies if cs: self._copies = () return cs @property_RO def dedup(self): '''Get the de-duplication setting (C{bool}). ''' return self._dedup def enumerate(self, closed=False, copies=False, dedup=False): '''Yield all items, each as a 2-tuple C{(index, item)}. @kwarg closed: Look back to the first B{C{point(s)}}. @kwarg copies: Make a copy of all B{C{items}} (C{bool}). @kwarg dedup: Set de-duplication in loop-back (C{bool}). ''' for item in self.iterate(closed=closed, copies=copies, dedup=dedup): yield self._indx, item def __getitem__(self, index): '''Get the item(s) at the given B{C{index}} or C{slice}. @raise IndexError: Invalid B{C{index}}, beyond B{C{loop}}. ''' t = self._items or self._copies or self._loop try: # Luciano Ramalho, "Fluent Python", page 293+, O'Reilly, 2016. if isinstance(index, slice): return t[index.start:index.stop:index.step] else: return t[index] except IndexError as x: t = Fmt.SQUARE(self.name, index) raise _IndexError(str(x), txt=t) def __iter__(self): # PYCHOK no cover '''Make this iterator C{iterable}. ''' # Luciano Ramalho, "Fluent Python", page 421, O'Reilly, 2016. return self.iterate() # XXX or self? def iterate(self, closed=False, copies=False, dedup=False): '''Yield all items, each as C{item}. @kwarg closed: Look back to the first B{C{point(s)}}. @kwarg copies: Make a copy of all B{C{items}} (C{bool}). @kwarg dedup: Set de-duplication in loop-back (C{bool}). @raise Error: Using C{B{closed}=True} without B{C{loop}}-back. ''' if closed and not self.loop: raise self._Error(closed=closed, loop=self.loop) if copies: if self._items: self._copies = self._items self._items = copy_ = None else: self._copies = list(self._loop) copy_ = self._copies.append else: # del B{C{items}} reference self._items = copy_ = None self._closed = closed if self._iter: try: next_ = self.next_ if copy_: while True: item = next_(dedup=dedup) copy_(item) yield item else: while True: yield next_(dedup=dedup) except StopIteration: self._iter = () # del self._iter, prevent re-iterate @property_RO def loop(self): '''Get the B{C{loop}} setting (C{int}), always C{0} in loop-back. ''' return len(self._loop) @property_RO def next(self): '''Get the next item. ''' return self._next_dedup() if self._dedup else self._next(False) # __next__ # NO __next__ AND __iter__ ... see Ramalho, page 426 def next_(self, dedup=False): '''Return the next item. @kwarg dedup: Set de-duplication for loop-back (C{bool}). ''' return self._next_dedup() if self._dedup else self._next(dedup) def _next(self, dedup): '''Return the next item, regardless. @arg dedup: Set de-duplication for loop-back (C{bool}). ''' try: self._indx += 1 self._prev = item = next(self._iter) return item except StopIteration: pass if self._closed and self._loop: # loop back self._iter = iter(self._loop) self._loop = () self._indx = 0 self._dedup = bool(dedup or self._dedup) return next(self._iter) def _next_dedup(self): '''Return the next item, different from the previous one. ''' prev = self._prev item = self._next(True) while item == prev: item = self._next(True) return item class PointsIter(_BaseIter): '''Iterator for C{points} with optional loop-back and copies. ''' _base = None _Error = PointsError def __init__(self, points, loop=0, base=None): '''New L{PointsIter} iterator. @arg points: C{Iterable} or C{list}, C{sequence}, C{set}, C{tuple}, etc. (C{point}s). @kwarg loop: Number of loop-back points, also initial C{enumerate} and C{iterate} index (non-negative C{int}). @kwarg base: Optional B{C{points}} instance for type checking (C{any}). @raise PointsError: Insufficient number of B{C{points}}. @raise TypeError: Some B{C{points}} are not B{C{base}}. ''' _BaseIter.__init__(self, points, loop=loop, name=_points_) if base and not (isNumpy2(points) or isTuple2(points)): self._base = base def enumerate(self, closed=False, copies=False): # PYCHOK signature '''Iterate and yield each point as a 2-tuple C{(index, point)}. @kwarg closed: Look back to the first B{C{point(s)}}, de-dup'ed (C{bool}). @kwarg copies: Save a copy of all B{C{points}} (C{bool}). @raise PointsError: Insufficient number of B{C{points}} or using C{B{closed}=True} without B{C{loop}}-back. @raise TypeError: Some B{C{points}} are not B{C{base}}-compatible. ''' for p in self.iterate(closed=closed, copies=copies): yield self._indx, p def iterate(self, closed=False, copies=False): # PYCHOK signature '''Iterate through all B{C{points}} starting at index C{loop}. @kwarg closed: Look back to the first B{C{point(s)}}, de-dup'ed (C{bool}). @kwarg copies: Save a copy of all B{C{points}} (C{bool}). @raise PointsError: Insufficient number of B{C{points}} or using C{B{closed}=True} without B{C{loop}}-back. @raise TypeError: Some B{C{points}} are not B{C{base}}-compatible. ''' if self._base: base_ = self._base.others fmt_ = Fmt.SQUARE(points=0).replace else: base_ = fmt_ = None n = self.loop if self._iter else 0 for p in _BaseIter.iterate(self, closed=closed, copies=copies, dedup=closed): if base_: base_(p, name=fmt_(_0_, str(self._indx)), up=2) yield p n += 1 if n < (4 if closed else 2): raise self._Error(self.name, n, txt=_too_(_few_)) class LatLon2PsxyIter(PointsIter): '''Iterate and convert for C{points} with optional loop-back and copies. ''' _deg2m = None _radius = None # keep degrees _wrap = True def __init__(self, points, loop=0, base=None, wrap=True, radius=None): '''New L{LatLon2PsxyIter} iterator. @note: The C{LatLon} latitude is considered the I{pseudo-y} and longitude the I{pseudo-x} coordinate, like L{LatLon2psxy}. @arg points: C{Iterable} or C{list}, C{sequence}, C{set}, C{tuple}, etc. (C{LatLon}[]). @kwarg loop: Number of loop-back points, also initial C{enumerate} and C{iterate} index (non-negative C{int}). @kwarg base: Optional B{C{points}} instance for type checking (C{any}). @kwarg wrap: Wrap lat- and longitudes (C{bool}). @kwarg radius: Mean earth radius (C{meter}) for conversion from C{degrees} to C{meter} (or C{radians} if C{B{radius}=1}). @raise PointsError: Insufficient number of B{C{points}}. @raise TypeError: Some B{C{points}} are not B{C{base}}-compatible. ''' PointsIter.__init__(self, points, loop=loop, base=base) if not wrap: self._wrap = False if radius: self._radius = r = Radius(radius) self._deg2m = degrees2m(_1_0, r) def __getitem__(self, index): '''Get the point(s) at the given B{C{index}} or C{slice}. @raise IndexError: Invalid B{C{index}}, beyond B{C{loop}}. ''' ll = PointsIter.__getitem__(self, index) if isinstance(index, slice): return map2(self._point3Tuple, ll) else: return self._point3Tuple(ll) def enumerate(self, closed=False, copies=False): # PYCHOK signature '''Iterate and yield each point as a 2-tuple C{(index, L{Point3Tuple})}. @kwarg closed: Look back to the first B{C{point(s)}}, de-dup'ed (C{bool}). @kwarg copies: Save a copy of all B{C{points}} (C{bool}). @raise PointsError: Insufficient number of B{C{points}} or using C{B{closed}=True} without B{C{loop}}-back. @raise TypeError: Some B{C{points}} are not B{C{base}}-compatible. ''' return PointsIter.enumerate(self, closed=closed, copies=copies) def iterate(self, closed=False, copies=False): # PYCHOK signature '''Iterate the B{C{points}} starting at index B{C{loop}} and yield each as a L{Point3Tuple}C{(x, y, ll)}. @kwarg closed: Loop back to the first B{C{point(s)}}, de-dup'ed (C{bool}). @kwarg copies: Save a copy of all B{C{points}} (C{bool}). @raise PointsError: Insufficient number of B{C{points}} or using C{B{closed}=True} without B{C{loop}}-back. @raise TypeError: Some B{C{points}} are not B{C{base}}-compatible. ''' if self._deg2m not in (None, _1_0): _point3Tuple = self._point3Tuple elif self._wrap: def _point3Tuple(ll): return Point3Tuple(wrap180(ll.lon), wrap90(ll.lat), ll) else: def _point3Tuple(ll): # PYCHOK redef return Point3Tuple(ll.lon, ll.lat, ll) for ll in PointsIter.iterate(self, closed=closed, copies=copies): yield _point3Tuple(ll) def _point3Tuple(self, ll): '''(INTERNAL) Create a L{Point3Tuple} for point B{C{ll}}. ''' x, y = ll.lon, ll.lat # note, x, y = lon, lat if self._wrap: x, y = wrap180(x), wrap90(y) d = self._deg2m if d: # convert degrees x *= d y *= d return Point3Tuple(x, y, ll) def _imdex2(closed, n): # PYCHOK by .clipy '''(INTERNAL) Return first and second index of C{range(B{n})}. ''' return (n-1, 0) if closed else (0, 1) def points2(points, closed=True, base=None, Error=PointsError): '''Check a path or polygon represented by points. @arg points: The path or polygon points (C{LatLon}[]) @kwarg closed: Optionally, consider the polygon closed, ignoring any duplicate or closing final B{C{points}} (C{bool}). @kwarg base: Optionally, check all B{C{points}} against this base class, if C{None} don't check. @kwarg Error: Exception to raise (C{ValueError}). @return: A L{Points2Tuple}C{(number, points)} with the number of points and the points C{list} or C{tuple}. @raise PointsError: Insufficient number of B{C{points}}. @raise TypeError: Some B{C{points}} are not B{C{base}} compatible. ''' n, points = len2(points) if closed: # remove duplicate or closing final points while n > 1 and points[n-1] in (points[0], points[n-2]): n -= 1 # XXX following line is unneeded if points # are always indexed as ... i in range(n) points = points[:n] # XXX numpy.array slice is a view! if n < (3 if closed else 1): raise Error(points=n, txt=_too_(_few_)) if base and not (isNumpy2(points) or isTuple2(points)): for i in range(n): base.others(points[i], name=Fmt.SQUARE(points=i)) return Points2Tuple(n, points) __all__ += _ALL_DOCS(_BaseIter) # **) 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.