#!/usr/bin/env python

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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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# This program demonstrates use of the KML DOM Python SWIG bindings 
# for walking the feature hierarchy of a KML file.

import sys
import kmldom
import kmlengine

argc = len(sys.argv)
if argc != 2:
  print 'usage: %s input.kml' % sys.argv[0]
  sys.exit(1)

inputkml = sys.argv[1]

def ReadFile(filename):
  f = open(filename, 'r')
  data = f.read()
  return data

def Indent(depth):
  while depth:
    print '  ',
    depth -= 1

def PrFeatureType(type):
  if type == kmldom.Type_Placemark:
    print 'Placemark',
  else:
    print 'some other Feature',

# This visits a feature.  The type of feature is printed.  If the feature
# is a container such is visited recursively.
def VisitFeature(feature, depth):
  Indent(depth)
  PrFeatureType(feature.Type())
  print 'id=',feature.get_id()
  container = kmldom.AsContainer(feature)
  if container:
    WalkContainer(container, depth+1)

# This visits each feature in the given container (<Document> or <Folder>).
def WalkContainer(container, depth):
  for i in range(container.get_feature_array_size()):
    VisitFeature(container.get_feature_array_at(i), depth)

# Program main: read the file to memory, parse it, get and visit
# the root feature if such exists.
def main():
  feature = kmlengine.GetRootFeature(kmldom.ParseKml(ReadFile(inputkml)))
  if feature:
    VisitFeature(feature, 0)
    # Python deletes the feature and all of its descendant elements in turn.
  else:
    # The file is a KML fragment.
    print 'No root feature in %s' % inputkml

if __name__ == '__main__':
  main()