# Coverage for pygeodesy/iters.py : 94%

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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. ''' from pygeodesy.basics import issubclassof, len2, map2 from pygeodesy.errors import _IndexError, LenError, PointsError, \ _ValueError 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, wrap90, wrap180 __all__ = _ALL_LAZY.iters __version__ = '21.06.15' _items_ = 'items' _iterNumpy2len = 1 # adjustable for testing purposes _NOTHING = object() # unique 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 = _NOTHING 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 # XXX if hasattr(items, 'next') or hasattr(items, '__length_hint__'): # XXX # handle reversed, iter, etc. items types 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}), C{0} for non-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._dedup = bool(dedup or self._dedup) self._indx = 0 self._iter = iter(self._loop) self._loop = () return next(self._iter) def _next_dedup(self): '''Return the next item, different from the previous one. ''' prev = self._prev item = self._next(True) if prev is not _NOTHING: 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, dedup=False, name=NN): '''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}). @kwarg dedup: Skip duplicate points (C{bool}). @kwarg name: Optional name (C{str}). @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, dedup=dedup, name=name or _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, dedup=False, name=NN): '''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}). @kwarg dedup: Skip duplicate points (C{bool}). @kwarg name: Optional name (C{str}). @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, dedup=dedup, name=name) 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 isNumpy2(obj): '''Check for an B{C{Numpy2LatLon}} points wrapper. @arg obj: The object (any C{type}). @return: C{True} if B{C{obj}} is an B{C{Numpy2LatLon}} instance, C{False} otherwise. ''' # isinstance(self, (Numpy2LatLon, ...)) return getattr(obj, isNumpy2.__name__, False) def isPoints2(obj): '''Check for an B{C{LatLon2psxy}} points wrapper. @arg obj: The object (any C{type}). @return: C{True} if B{C{obj}} is an B{C{LatLon2psxy}} instance, C{False} otherwise. ''' # isinstance(self, (LatLon2psxy, ...)) return getattr(obj, isPoints2.__name__, False) def isTuple2(obj): '''Check for an B{C{Tuple2LatLon}} points wrapper. @arg obj: The object (any). @return: C{True} if B{C{obj}} is an B{C{Tuple2LatLon}} instance, C{False} otherwise. ''' # isinstance(self, (Tuple2LatLon, ...)) return getattr(obj, isTuple2.__name__, False) def iterNumpy2(obj): '''Iterate over Numpy2 wrappers or other sequences exceeding the threshold. @arg obj: Points array, list, sequence, set, etc. (any). @return: C{True} do, C{False} don't iterate. ''' try: return isNumpy2(obj) or len(obj) > _iterNumpy2len except TypeError: return False def iterNumpy2over(n=None): '''Get or set the L{iterNumpy2} threshold. @kwarg n: Optional, new threshold (C{int}). @return: Previous threshold (C{int}). @raise ValueError: Invalid B{C{n}}. ''' global _iterNumpy2len p = _iterNumpy2len if n is not None: try: i = int(n) if i > 0: _iterNumpy2len = i else: raise ValueError except (TypeError, ValueError): raise _ValueError(n=n) return p 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.