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#!/usr/bin/env ruby
# Copyright 2008, Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# 2. 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.
# 3. Neither the name of Google Inc. nor the names of its contributors may be
# used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
# This program demonstrates use of the KML DOM Ruby SWIG bindings
# for walking the feature hierarchy of a KML file.
require 'setpath'
def ReadFile(filename)
data = ''
file = File.new(filename, "r")
file.each { |line| data += line }
return data
end
def Indent(depth)
while depth > 0
print " "
depth -= 1
end
end
def PrFeatureType(type)
if type == Kmldom::Type_Placemark
print "Placemark "
else
print "some other Feature "
end
end
# 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())
puts "id = #{feature.id()}"
container = Kmldom::AsContainer(feature)
if container:
WalkContainer(container, depth+1)
end
end
# This visits each feature in the given container (<Document> or <Folder>).
def WalkContainer(container, depth)
for i in 0..container.feature_array_size()-1
VisitFeature(container.feature_array_at(i), depth)
end
end
# The root feature of a KML file is the child feature of the <kml>
# element or the root xml element if that is a Feature.
# If element is neither <kml> nor a feature nil is returned.
def GetRootFeature(element)
kml = Kmldom::AsKml(element)
if kml
if kml.has_feature():
return kml.feature()
else
return nil
end
end
feature = Kmldom::AsFeature(element)
if feature
return feature
end
return nil
end
def main(inputkml)
feature = GetRootFeature(Kmldom::ParseKml(ReadFile(inputkml)))
if feature
VisitFeature(feature, 0)
# Ruby deletes the feature returned from ParseKml which in turn
# deletes all child elements.
else
# The file is a KML fragment.
puts "No root feature in #{inputkml}"
end
end
if __FILE__ == $0
if ARGV.length != 1
puts "usage: #{$0} input.kml"
exit 0
end
main(ARGV[0])
end
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