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#!/usr/bin/perl
# 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 Perl SWIG bindings for
# walking the feature hierarchy of a KML file.
use strict;
use warnings;
use lib "../../build/perl";
use kmldom;
sub ReadKmlFile {
my $filename = $_[0];
local $/;
open(FILE, $filename) or die("error: can't open $filename");
my $data = <FILE>;
close(FILE);
return $data;
}
sub Indent {
my $depth = $_[0];
while ($depth > 0) {
print ' ';
$depth -= 1;
}
}
sub PrFeatureType {
my $type = $_[0];
if ($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.
sub VisitFeature {
my $feature = $_[0];
my $depth = $_[1];
Indent($depth);
PrFeatureType($feature->Type());
printf("id = %s\n", $feature->id());
my $container = kmldom::AsContainer($feature);
if (defined $container) {
WalkContainer($container, $depth+1);
}
}
# This visits each feature in the given container (<Document> or <Folder>).
sub WalkContainer {
my $container = $_[0];
my $depth = $_[1];
for (my $i = 0; $i < $container->feature_array_size(); $i++) {
VisitFeature($container->feature_array_at($i), $depth);
}
}
# 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 None is returned.
sub GetRootFeature {
my $kml = kmldom::AsKml($_[0]);
if (defined $kml) {
if ($kml->has_feature()) {
return $kml->feature();
} else {
return undef;
}
}
my $feature = kmldom::AsFeature($_[0]);
if (defined $feature) {
return $feature;
}
return undef;
}
sub main {
my $inputkml = $_[0];
my $kml = ReadKmlFile($inputkml);
my $feature = GetRootFeature(kmldom::ParseKml(ReadKmlFile($inputkml)));
if (defined $feature) {
VisitFeature($feature, 0);
# Perl deletes the returned feature from ParseKml which in turn deletes all
# child elements.
} else {
# The file is a KML fragment.
print "No root feature in $inputkml\n";
}
}
if ($#ARGV != 0) {
printf("usage: input.kml\n");
exit;
}
main($ARGV[0]);
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