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package Geo::OSM::OsmXML;
use strict;
use warnings;
use Utils::File;
use Utils::Math;
use Utils::Debug;
use XML::Parser;
sub new(){ bless{} }
sub load(){
my ($self, $file_name) = @_;
my $start_time = time();
my $P = new XML::Parser(Handlers => {Start => \&DoStart, End => \&DoEnd, Char => \&DoChar});
my $fh = data_open($file_name);
die "Cannot open OSM File $file_name\n" unless $fh;
eval {
$P->parse($fh);
};
print "\n" if $DEBUG || $VERBOSE;
if ( $VERBOSE) {
printf "Read and parsed $file_name in %.0f sec\n",time()-$start_time;
}
if ( $@ ) {
warn "$@Error while parsing\n $file_name\n";
return;
}
if (not $P) {
warn "WARNING: Could not parse osm data\n";
return;
}
}
sub name(){return($OsmXML::lastName)};
sub bounds(){
my ($S,$W,$N,$E) = (1e+6,1e+6,-1e+6,-1e+6); # S,W,N,E
foreach my $Node(values %OsmXML::Nodes){
$S = $Node->{"lat"} if($Node->{"lat"} < $S);
$N = $Node->{"lat"} if($Node->{"lat"} > $N);
$W = $Node->{"lon"} if($Node->{"lon"} < $W);
$E = $Node->{"lon"} if($Node->{"lon"} > $E);
}
return($S,$W,$N,$E);
}
# Function is called whenever an XML tag is started
sub DoStart()
{
my ($Expat, $Name, %Attr) = @_;
if($Name eq "node"){
undef %OsmXML::Tags;
%OsmXML::MainAttr = %Attr;
}
if($Name eq "segment"){
undef %OsmXML::Tags;
%OsmXML::MainAttr = %Attr;
}
if($Name eq "way"){
undef %OsmXML::Tags;
undef @OsmXML::WaySegments;
%OsmXML::MainAttr = %Attr;
}
if($Name eq "tag"){
$OsmXML::Tags{$Attr{"k"}} = $Attr{"v"};
}
if($Name eq "seg"){
push(@OsmXML::WaySegments, $Attr{"id"});
}
}
# Function is called whenever an XML tag is ended
sub DoEnd(){
my ($Expat, $Element) = @_;
if($Element eq "node"){
my $ID = $OsmXML::MainAttr{"id"};
$OsmXML::Nodes{$ID}{"lat"} = $OsmXML::MainAttr{"lat"};
$OsmXML::Nodes{$ID}{"lon"} = $OsmXML::MainAttr{"lon"};
foreach(keys(%OsmXML::Tags)){
$OsmXML::Nodes{$ID}{$_} = $OsmXML::Tags{$_};
}
}
if($Element eq "segment"){
my $ID = $OsmXML::MainAttr{"id"};
$OsmXML::Segments{$ID}{"from"} = $OsmXML::MainAttr{"from"};
$OsmXML::Segments{$ID}{"to"} = $OsmXML::MainAttr{"to"};
foreach(keys(%OsmXML::Tags)){
$OsmXML::Segments{$ID}{$_} = $OsmXML::Tags{$_};
}
}
if($Element eq "way"){
my $ID = $OsmXML::MainAttr{"id"};
$OsmXML::Ways{$ID}{"segments"} = join(",",@OsmXML::WaySegments);
foreach(keys(%OsmXML::Tags)){
$OsmXML::Ways{$ID}{$_} = $OsmXML::Tags{$_};
}
}
}
# Function is called whenever text is encountered in the XML file
sub DoChar(){
my ($Expat, $String) = @_;
}
1;
__END__
=head1 NAME
OsmXML - Module for reading OpenStreetMap XML data files
=head1 SYNOPSIS
$OSM = new OsmXML();
$OSM->load("Data/nottingham.osm");
foreach $Way(%OsmXML::Ways){
@Segments = split(/,/, $Way->{"segments"});
foreach $SegmentID(@Segments){
$Segment = $OsmXML::Segments{$SegmentID};
$Node1 = $OsmXML::Nodes{$Segment->{"from"}};
$Node2 = $OsmXML::Nodes{$Segment->{"to"}};
printf "Node at %f,%f, named %s, is a %s",
$Node2->{"lat"},
$Node2->{"lon"},
$Node2->{"name"},
$Node2->{"highway"};
}
}
=head1 AUTHOR
Oliver White (oliver.white@blibbleblobble.co.uk)
=head1 COPYRIGHT
Copyright 2006, Oliver White
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
=cut
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