# Support for the GeoRSS format # Copyright 2010-2015 Kurt McKee # Copyright 2002-2008 Mark Pilgrim # All rights reserved. # # This file is a part of feedparser. # # Redistribution and use in source and binary forms, with or without modification, # are permitted provided that the following conditions are met: # # * Redistributions of source code must retain the above copyright notice, # this list of conditions and the following disclaimer. # * Redistributions in binary form must reproduce the above copyright notice, # this list of conditions and the following disclaimer in the documentation # and/or other materials provided with the distribution. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS' # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE # POSSIBILITY OF SUCH DAMAGE. from __future__ import absolute_import, unicode_literals from ..util import FeedParserDict class Namespace(object): supported_namespaces = { 'http://www.w3.org/2003/01/geo/wgs84_pos#': 'geo', 'http://www.georss.org/georss': 'georss', 'http://www.opengis.net/gml': 'gml', } def __init__(self): self.ingeometry = 0 super(Namespace, self).__init__() def _start_georssgeom(self, attrsD): self.push('geometry', 0) context = self._getContext() context['where'] = FeedParserDict() _start_georss_point = _start_georssgeom _start_georss_line = _start_georssgeom _start_georss_polygon = _start_georssgeom _start_georss_box = _start_georssgeom def _save_where(self, geometry): context = self._getContext() context['where'].update(geometry) def _end_georss_point(self): geometry = _parse_georss_point(self.pop('geometry')) if geometry: self._save_where(geometry) def _end_georss_line(self): geometry = _parse_georss_line(self.pop('geometry')) if geometry: self._save_where(geometry) def _end_georss_polygon(self): this = self.pop('geometry') geometry = _parse_georss_polygon(this) if geometry: self._save_where(geometry) def _end_georss_box(self): geometry = _parse_georss_box(self.pop('geometry')) if geometry: self._save_where(geometry) def _start_where(self, attrsD): self.push('where', 0) context = self._getContext() context['where'] = FeedParserDict() _start_georss_where = _start_where def _parse_srs_attrs(self, attrsD): srsName = attrsD.get('srsname') try: srsDimension = int(attrsD.get('srsdimension', '2')) except ValueError: srsDimension = 2 context = self._getContext() context['where']['srsName'] = srsName context['where']['srsDimension'] = srsDimension def _start_gml_point(self, attrsD): self._parse_srs_attrs(attrsD) self.ingeometry = 1 self.push('geometry', 0) def _start_gml_linestring(self, attrsD): self._parse_srs_attrs(attrsD) self.ingeometry = 'linestring' self.push('geometry', 0) def _start_gml_polygon(self, attrsD): self._parse_srs_attrs(attrsD) self.push('geometry', 0) def _start_gml_exterior(self, attrsD): self.push('geometry', 0) def _start_gml_linearring(self, attrsD): self.ingeometry = 'polygon' self.push('geometry', 0) def _start_gml_pos(self, attrsD): self.push('pos', 0) def _end_gml_pos(self): this = self.pop('pos') context = self._getContext() srsName = context['where'].get('srsName') srsDimension = context['where'].get('srsDimension', 2) swap = True if srsName and "EPSG" in srsName: epsg = int(srsName.split(":")[-1]) swap = bool(epsg in _geogCS) geometry = _parse_georss_point(this, swap=swap, dims=srsDimension) if geometry: self._save_where(geometry) def _start_gml_poslist(self, attrsD): self.push('pos', 0) def _end_gml_poslist(self): this = self.pop('pos') context = self._getContext() srsName = context['where'].get('srsName') srsDimension = context['where'].get('srsDimension', 2) swap = True if srsName and "EPSG" in srsName: epsg = int(srsName.split(":")[-1]) swap = bool(epsg in _geogCS) geometry = _parse_poslist( this, self.ingeometry, swap=swap, dims=srsDimension) if geometry: self._save_where(geometry) def _end_geom(self): self.ingeometry = 0 self.pop('geometry') _end_gml_point = _end_geom _end_gml_linestring = _end_geom _end_gml_linearring = _end_geom _end_gml_exterior = _end_geom _end_gml_polygon = _end_geom def _end_where(self): self.pop('where') _end_georss_where = _end_where # GeoRSS geometry parsers. Each return a dict with 'type' and 'coordinates' # items, or None in the case of a parsing error. def _parse_poslist(value, geom_type, swap=True, dims=2): if geom_type == 'linestring': return _parse_georss_line(value, swap, dims) elif geom_type == 'polygon': ring = _parse_georss_line(value, swap, dims) return {'type': 'Polygon', 'coordinates': (ring['coordinates'],)} else: return None def _gen_georss_coords(value, swap=True, dims=2): # A generator of (lon, lat) pairs from a string of encoded GeoRSS # coordinates. Converts to floats and swaps order. latlons = (float(ll) for ll in value.replace(',', ' ').split()) while True: t = [next(latlons), next(latlons)][::swap and -1 or 1] if dims == 3: t.append(next(latlons)) yield tuple(t) def _parse_georss_point(value, swap=True, dims=2): # A point contains a single latitude-longitude pair, separated by # whitespace. We'll also handle comma separators. try: coords = list(_gen_georss_coords(value, swap, dims)) return {'type': 'Point', 'coordinates': coords[0]} except (IndexError, ValueError): return None def _parse_georss_line(value, swap=True, dims=2): # A line contains a space separated list of latitude-longitude pairs in # WGS84 coordinate reference system, with each pair separated by # whitespace. There must be at least two pairs. try: coords = list(_gen_georss_coords(value, swap, dims)) return {'type': 'LineString', 'coordinates': coords} except (IndexError, ValueError): return None def _parse_georss_polygon(value, swap=True, dims=2): # A polygon contains a space separated list of latitude-longitude pairs, # with each pair separated by whitespace. There must be at least four # pairs, with the last being identical to the first (so a polygon has a # minimum of three actual points). try: ring = list(_gen_georss_coords(value, swap, dims)) except (IndexError, ValueError): return None if len(ring) < 4: return None return {'type': 'Polygon', 'coordinates': (ring,)} def _parse_georss_box(value, swap=True, dims=2): # A bounding box is a rectangular region, often used to define the extents # of a map or a rough area of interest. A box contains two space separate # latitude-longitude pairs, with each pair separated by whitespace. The # first pair is the lower corner, the second is the upper corner. try: coords = list(_gen_georss_coords(value, swap, dims)) return {'type': 'Box', 'coordinates': tuple(coords)} except (IndexError, ValueError): return None # The list of EPSG codes for geographic (latitude/longitude) coordinate # systems to support decoding of GeoRSS GML profiles. _geogCS = [ 3819, 3821, 3824, 3889, 3906, 4001, 4002, 4003, 4004, 4005, 4006, 4007, 4008, 4009, 4010, 4011, 4012, 4013, 4014, 4015, 4016, 4018, 4019, 4020, 4021, 4022, 4023, 4024, 4025, 4027, 4028, 4029, 4030, 4031, 4032, 4033, 4034, 4035, 4036, 4041, 4042, 4043, 4044, 4045, 4046, 4047, 4052, 4053, 4054, 4055, 4075, 4081, 4120, 4121, 4122, 4123, 4124, 4125, 4126, 4127, 4128, 4129, 4130, 4131, 4132, 4133, 4134, 4135, 4136, 4137, 4138, 4139, 4140, 4141, 4142, 4143, 4144, 4145, 4146, 4147, 4148, 4149, 4150, 4151, 4152, 4153, 4154, 4155, 4156, 4157, 4158, 4159, 4160, 4161, 4162, 4163, 4164, 4165, 4166, 4167, 4168, 4169, 4170, 4171, 4172, 4173, 4174, 4175, 4176, 4178, 4179, 4180, 4181, 4182, 4183, 4184, 4185, 4188, 4189, 4190, 4191, 4192, 4193, 4194, 4195, 4196, 4197, 4198, 4199, 4200, 4201, 4202, 4203, 4204, 4205, 4206, 4207, 4208, 4209, 4210, 4211, 4212, 4213, 4214, 4215, 4216, 4218, 4219, 4220, 4221, 4222, 4223, 4224, 4225, 4226, 4227, 4228, 4229, 4230, 4231, 4232, 4233, 4234, 4235, 4236, 4237, 4238, 4239, 4240, 4241, 4242, 4243, 4244, 4245, 4246, 4247, 4248, 4249, 4250, 4251, 4252, 4253, 4254, 4255, 4256, 4257, 4258, 4259, 4260, 4261, 4262, 4263, 4264, 4265, 4266, 4267, 4268, 4269, 4270, 4271, 4272, 4273, 4274, 4275, 4276, 4277, 4278, 4279, 4280, 4281, 4282, 4283, 4284, 4285, 4286, 4287, 4288, 4289, 4291, 4292, 4293, 4294, 4295, 4296, 4297, 4298, 4299, 4300, 4301, 4302, 4303, 4304, 4306, 4307, 4308, 4309, 4310, 4311, 4312, 4313, 4314, 4315, 4316, 4317, 4318, 4319, 4322, 4324, 4326, 4463, 4470, 4475, 4483, 4490, 4555, 4558, 4600, 4601, 4602, 4603, 4604, 4605, 4606, 4607, 4608, 4609, 4610, 4611, 4612, 4613, 4614, 4615, 4616, 4617, 4618, 4619, 4620, 4621, 4622, 4623, 4624, 4625, 4626, 4627, 4628, 4629, 4630, 4631, 4632, 4633, 4634, 4635, 4636, 4637, 4638, 4639, 4640, 4641, 4642, 4643, 4644, 4645, 4646, 4657, 4658, 4659, 4660, 4661, 4662, 4663, 4664, 4665, 4666, 4667, 4668, 4669, 4670, 4671, 4672, 4673, 4674, 4675, 4676, 4677, 4678, 4679, 4680, 4681, 4682, 4683, 4684, 4685, 4686, 4687, 4688, 4689, 4690, 4691, 4692, 4693, 4694, 4695, 4696, 4697, 4698, 4699, 4700, 4701, 4702, 4703, 4704, 4705, 4706, 4707, 4708, 4709, 4710, 4711, 4712, 4713, 4714, 4715, 4716, 4717, 4718, 4719, 4720, 4721, 4722, 4723, 4724, 4725, 4726, 4727, 4728, 4729, 4730, 4731, 4732, 4733, 4734, 4735, 4736, 4737, 4738, 4739, 4740, 4741, 4742, 4743, 4744, 4745, 4746, 4747, 4748, 4749, 4750, 4751, 4752, 4753, 4754, 4755, 4756, 4757, 4758, 4759, 4760, 4761, 4762, 4763, 4764, 4765, 4801, 4802, 4803, 4804, 4805, 4806, 4807, 4808, 4809, 4810, 4811, 4813, 4814, 4815, 4816, 4817, 4818, 4819, 4820, 4821, 4823, 4824, 4901, 4902, 4903, 4904, 4979 ]