Add nearmap overlay
[bus.git] / origin-src / transitfeed-1.2.5 / kmlparser.py
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
#!/usr/bin/python2.5
 
# Copyright (C) 2007 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
 
"""
This package provides implementation of a converter from a kml
file format into Google transit feed format.
 
The KmlParser class is the main class implementing the parser.
 
Currently only information about stops is extracted from a kml file.
The extractor expects the stops to be represented as placemarks with
a single point.
"""
 
import re
import string
import sys
import transitfeed
from transitfeed import util
import xml.dom.minidom as minidom
import zipfile
 
 
class Placemark(object):
  def __init__(self):
    self.name = ""
    self.coordinates = []
 
  def IsPoint(self):
    return len(self.coordinates) == 1
 
  def IsLine(self):
    return len(self.coordinates) > 1
 
class KmlParser(object):
  def __init__(self, stopNameRe = '(.*)'):
    """
    Args:
      stopNameRe - a regular expression to extract a stop name from a
                   placemaker name
    """
    self.stopNameRe = re.compile(stopNameRe)
 
  def Parse(self, filename, feed):
    """
    Reads the kml file, parses it and updated the Google transit feed
    object with the extracted information.
 
    Args:
      filename - kml file name
      feed - an instance of Schedule class to be updated
    """
    dom = minidom.parse(filename)
    self.ParseDom(dom, feed)
 
  def ParseDom(self, dom, feed):
    """
    Parses the given kml dom tree and updates the Google transit feed object.
 
    Args:
      dom - kml dom tree
      feed - an instance of Schedule class to be updated
    """
    shape_num = 0
    for node in dom.getElementsByTagName('Placemark'):
      p = self.ParsePlacemark(node)
      if p.IsPoint():
        (lon, lat) = p.coordinates[0]
        m = self.stopNameRe.search(p.name)
        feed.AddStop(lat, lon, m.group(1))
      elif p.IsLine():
        shape_num = shape_num + 1
        shape = transitfeed.Shape("kml_shape_" + str(shape_num))
        for (lon, lat) in p.coordinates:
          shape.AddPoint(lat, lon)
        feed.AddShapeObject(shape)
 
  def ParsePlacemark(self, node):
    ret = Placemark()
    for child in node.childNodes:
      if child.nodeName == 'name':
        ret.name = self.ExtractText(child)
      if child.nodeName == 'Point' or child.nodeName == 'LineString':
        ret.coordinates = self.ExtractCoordinates(child)
    return ret
 
  def ExtractText(self, node):
    for child in node.childNodes:
      if child.nodeType == child.TEXT_NODE:
        return child.wholeText  # is a unicode string
    return ""
 
  def ExtractCoordinates(self, node):
    coordinatesText = ""
    for child in node.childNodes:
      if child.nodeName == 'coordinates':
        coordinatesText = self.ExtractText(child)
        break
    ret = []
    for point in coordinatesText.split():
      coords = point.split(',')
      ret.append((float(coords[0]), float(coords[1])))
    return ret
 
 
def main():
  usage = \
"""%prog <input.kml> <output GTFS.zip>
 
Reads KML file <input.kml> and creates GTFS file <output GTFS.zip> with
placemarks in the KML represented as stops.
"""
 
  parser = util.OptionParserLongError(
      usage=usage, version='%prog '+transitfeed.__version__)
  (options, args) = parser.parse_args()
  if len(args) != 2:
    parser.error('You did not provide all required command line arguments.')
 
  if args[0] == 'IWantMyCrash':
    raise Exception('For testCrashHandler')
 
  parser = KmlParser()
  feed = transitfeed.Schedule()
  feed.save_all_stops = True
  parser.Parse(args[0], feed)
  feed.WriteGoogleTransitFeed(args[1])
 
  print "Done."
 
 
if __name__ == '__main__':
  util.RunWithCrashHandler(main)